Mechanically interlocked molecules (MIMs) have unique properties with broad applications, yet constructing both knotted and linked topologies from the same ligand remains challenging due to their distinct geometric de...Mechanically interlocked molecules (MIMs) have unique properties with broad applications, yet constructing both knotted and linked topologies from the same ligand remains challenging due to their distinct geometric demands. To address this, we design and synthesize a conformationally adaptive ligand 4,7-bis(3-(pyridin-4-yl) phenyl) benzo[c][1,2,5]thiadiazole (L1) with a tunable torsional angle θ of N1C1C2N2 ranging from 7.5° to 108.9°. Utilizing coordination-driven self-assembly at ambient temperature, L1 selectively assembles with binuclear half-sandwich units RhB1, RhB2, RhB3, and RhB4 featuring Cp*^(Rh^(Ⅲ)) (Cp* = η^(5)-pentam-ethylcyclopentadienyl) into distinct topologies: Solomon links Rh-1, trefoil knots Rh-2, molecular tweezers Rh 3, and Rh-4, respectively. Crucially, the self-adaptability of ligand L1 directs topology formation through pro-gramming different combination of noncovalent interactions (π-x stacking, CH..π interaction, and lone pair-π interaction), thus navigating divergent assembly pathways by conformational switching, as evidenced by X-ray crystallography analysis, independent gradient model (IGM) analysis, detailed nuclear magnetic resonance (NMR) spectroscopy and electrospray ionization time-of-flight/mass spectrometry (ESI-TOF/MS). This strategy can also be extended to construct Cp*^(Irl^(Ⅲ)) analogs (Solomon links Ir-1, trefoil knots Ir-2, molecular tweezers Ir-3 and Ir-4), demonstrating metal-independent control and achieving intricate topologies in a high yield.展开更多
AIM:To investigate trefoil factor(TFF) gene copy number,mRNA and protein expression as potential biomarkers in cholangiocarcinoma(CCA).METHODS:TFF mRNA levels,gene copy number and protein expression were determined re...AIM:To investigate trefoil factor(TFF) gene copy number,mRNA and protein expression as potential biomarkers in cholangiocarcinoma(CCA).METHODS:TFF mRNA levels,gene copy number and protein expression were determined respectively by quantitative reverse transcription polymerase chain reaction(PCR),quantitative PCR and immunohistochemistry in bile duct epithelium biopsies collected from individuals with CCA,precancerous bile duct dysplasia and from disease-free controls.The functional impact of recombinant human(rh) TFF2 peptide treatment on proliferation and epidermal growth factor receptor(EGFR) /mitogenactivated protein kinase(MAPK) signaling was assessed in the CCA cell line,KMBC,by viable cell counting and immunoblotting,respectively.RESULTS:TFF1,TFF2 and TFF3 mRNA expression was significantly increased in CCA tissue compared to disease-free controls,and was unrelated to gene copy number.TFF1 immunoreactivity was strongly increased in both dysplasia and CCA,whereas TFF2 immunoreactivity was increased only in CCA compared to diseasefree controls.By contrast,TFF3 immunoreactivity was moderately decreased in dysplasia and further decreased in CCA.Kaplan-Meier analysis found no association of TFF mRNA,protein and copy number with age,gender,histological subtype,and patient survival time.Treatment of KMBC cells with rhTFF2 stimulated proliferation,triggered phosphorylation of EGFR and downstream extracellular signal related kinase(ERK),whereas co-incubation with the EGFR tyrosine kinase inhibitor,PD153035,blocked rhTFF2-dependent proliferation and EGFR/ERK responses.CONCLUSION:TFF mRNA/protein expression is indicative of CCA tumor progression,but not predictive for histological sub-type or survival time.TFF2 is mitogenic in CCA via EGFR/MAPK activation.展开更多
AIM The purpose of this study was to evaluate the diagnostic value of trefoil factor family 3(TFF3) for the early detection of colorectal cancer(CC). METHODS Serum TFF3 and carcino-embryonic antigen(CEA) were detected...AIM The purpose of this study was to evaluate the diagnostic value of trefoil factor family 3(TFF3) for the early detection of colorectal cancer(CC). METHODS Serum TFF3 and carcino-embryonic antigen(CEA) were detected in 527 individuals, including 115 healthy control(HC), 198 colorectal adenoma(CA), and 214 CC individuals in the training group. RESULTS Serum TFF3 showed no significant correlation with age, gender, or tumor location but showed significant correlation with the tumor stage. Serum TFF3 in the CC group was significantly higher than in the HC or CA group. The AUC values of TFF3 for discriminating between HC and CC and between CA and CC were 0.930(0.903, 0.958) and 0.834(0.796, 0.873). A multivariate model combining TFF3 and CEA was built. Compared to TFF3 or CEA alone, the multivariate model showed significant improvement(P < 0.001). For discriminating between HC and CC, HC and early stage CC, HC and advanced stage CC, CA and CC, CA and early stage CC, and CA and advanced stage CC in the training group, the sensitivities were 92.99%, 91.46%, 93.18%, 73.83%, 76.83%, and 81.82%, and the specificities were 91.30%, 91.30%, 93.91%, 88.38%, 77.27%, and 88.38%, respectively. After validation, the sensitivities were 89.39%, 85.71%, 90.79%, 72.73%, 71.43%, and 78.95%, and the specificities were 87.85%, 87.85%, 2.52%, 87.85%, 80.77%, and 87.50%, respectively. CONCLUSION The multivariate diagnostic model that included TFF3 and CEA showed significant improvement over the conventional biomarker CEA and might provide a potential method for the early detection of CC.展开更多
AIM： To study the expression of trefoil factor 1 （TFF1） and TFF2 in precancerous condition and gastric cancer and to explore the relationship between TFFs and tumorigenesis, precancerous condition and gastric cance...AIM： To study the expression of trefoil factor 1 （TFF1） and TFF2 in precancerous condition and gastric cancer and to explore the relationship between TFFs and tumorigenesis, precancerous condition and gastric cancer. METHODS： The expression of TFF1 and TFF2 was immunohistochemically analyzed in paraffin-embedded samples from 140 patients including 35 cases of chronic superficial gastritis （CSG）, 35 cases of gastric ulcer （GU）, 35 cases of chronic atrophic gastritis （CAG） and 35 cases of gastric cancer （GC）. RESULTS： TFF1 and TFF2 were located in cytoplasm of gastric mucous cells. In CSG, GU, CAG and GC, the level of TFF1 expression had a decreased tendency （P〈 0.05）. The expression of TFF2 was higher in GU than in CSG, but the difference was not significant. The expression of TFF2 also had a decreased tendency in GU, CAG, and GC （P〈 0.05）. CONCLUSION： The reduced expression of TFF1 and TFF2 in precancerous conditions and gastric cancer may be associated with the proliferation and malignant transformation of gastric mucosa. More investigations are needed to explore the mechanism of TFFs and the relationship between TFFs and gastric cancer.展开更多
AIM To detect the expression of trefoil factors (TFFs) and TWIST1 in colorectal cancer (CRC) and analyze their correlation with metastasis and survival. METHODS This study examined the expression of TFF1, TFF3 and TWI...AIM To detect the expression of trefoil factors (TFFs) and TWIST1 in colorectal cancer (CRC) and analyze their correlation with metastasis and survival. METHODS This study examined the expression of TFF1, TFF3 and TWIST1 in a total of 75 tumor samples, 47 matched normal samples (15 cm from the lesion margin), 30 metastatic lymph nodes, and 10 liver metastatic cancer samples from patients with CRC. The relationship was then analyzed between the protein expression and different clinical records. TFF1, TFF3, TWIST1, E-cadherin, vimentin and beta-catenin mRNA and protein expression levels were measured in colon cancer cell lines with different metastatic potentials (HIEC, HT29, SW620, and LoVo cells), and the correlation of the expression levels with epithelial-mesenchymal transition (EMT) was discussed. RESULTS It was found that 66.7% (50/75), 78.7% (59/75) and 54.7% (41/75) of tumor tissue samples exhibited positive staining for TFF1, TFF3 and TWIST1 and so did 27.3% (13/47), 100% (47/47) and 17% (8/47) of adjacent normal colorectal tissues. Compared with adjacent normal tissues, significant differences were found in the expression of all three proteins in different cancerous tissues (P < 0.05). Higher expression of TFF3 and TWIST1 was significantly correlated with lymph node metastasis (P = 0.034, P = 0.000), advanced stage (P = 0.031, P = 0.003), and poorer survival (P = 0.042 for the TFF3 group, P = 0.003 for the TWIST1 group). The expression of TFF3 and TWIST1 in cancer cell lines was higher than that in HIEC (a normal human intestinal epithelial cell line)(P < 0.05), and the expression intensity demonstrated a tendency to rise with increased metastatic potential both at the protein and mRNA levels. However, TFF1 expression demonstrated the opposite tendency. It was also observed that the expression of E-cadherin and beta-catenin tended to decrease while that of vimentin, TWIST1 and Snail tended to rise with the increase in metastatic potential. CONCLUSION The expression of TFF3 and TWIST1 might be associated with the survival of patients with CRC after curative resection and might be pivotal predictors of disease progression. TFF3 may be correlated to the invasiveness of CRC.展开更多
Inflammatory bowel disease (IBD), which comprises ulcerative colitis and Crohn’s disease, is characterized by inflammation of the gastrointestinal tract. The trefoil factors 1, 2, and 3 (TFF1-3) are a fami...Inflammatory bowel disease (IBD), which comprises ulcerative colitis and Crohn’s disease, is characterized by inflammation of the gastrointestinal tract. The trefoil factors 1, 2, and 3 (TFF1-3) are a family of peptides that play important roles in the protection and repair of epithelial surfaces, including the gastrointestinal tract. TFFs may be involved in IBD pathogenesis and are a potential treatment option. In the present review, we describe the TFF family and their potential role in IBD by summarizing the current knowledge of their expression, possible function and pharmacological role in IBD.展开更多
AIM:To determine whether trefoil factor 1 (TFF1) is associated with mucosa healing and carcinoma suppression, we assess the expression of trefoil factor 1 in normal and pathologic gastric mucosa. METHODS: TFF1 in norm...AIM:To determine whether trefoil factor 1 (TFF1) is associated with mucosa healing and carcinoma suppression, we assess the expression of trefoil factor 1 in normal and pathologic gastric mucosa. METHODS: TFF1 in normal and pathologic gastric mucosa was assessed by immunohistochemical method, and the average positive A was estimated by Motic Images Advanced 3.0 software. RESULTS: Increased TFF1 was detected in gastritis, gastric ulcer and duodenal ulcer compared with normal mucosa. The same result could be seen in multiple and compound ulcer compared with simple ulcer. There was no significant difference between gastric ulcer and duodenal ulcer, gastritis and simple ulcer respectively. Increased TFF1 was detected in the peripheral mucosa of the gastric adenocarcinoma compared with normal mucosa. The expression of TFF1 in gastric adenocarcinoma was related to the differentiation of adenocarcinoma. The lower the differentiation of adenocarcinoma, the weaker the expression of TFF1. There was no TFF1 expressed in low-differentiated adenocarcinoma. The expression of TFF1 in middle and highly differentiated adenocarcinoma was a little lower than that in normal mucosa. But there was no significant difference. No TFF1 was assessed in esophageal squamous carcinoma and peripheral tissue. There was no significant difference between male and female. CONCLUSION: The expression of TFF1 was higher in gastritis and peptic ulcer than that in normal mucosa, and was also higher in multiple and compound ulcer than in simple ulcer. It seems that TFF1 plays a role in gastric mucosa protection and epithelial restitution. Increased expression of TFF1 in peripheral tissue suggests that TFF1 is associated with mechanism of carcinoma suppression and differentiation. Decreased expression of TFF1 in carcinoma and its relativity to the differentiation suggests that TFF1 is related to gland and cell destruction of carcinoma.展开更多
AIM： To investigate electroacupunture（EA） at the acupoints of Stomach Meridian of Foot-Yangming（SMFY）, Gallbladder Meridian of Foot-Yangming（SMFY） on gastric mucosal intestinal trefoil factor （ITF） gene expre...AIM： To investigate electroacupunture（EA） at the acupoints of Stomach Meridian of Foot-Yangming（SMFY）, Gallbladder Meridian of Foot-Yangming（SMFY） on gastric mucosal intestinal trefoil factor （ITF） gene expression detection in stress-induced rats with gastric mucosal lesion, and to explore the regulatory mechanism and significance of EA-related gastric mucosal protective effect. METHODS： Forty rats were randomly divided into 4 groups： Blank group, Model group, Model group＋EA at acupoints of SMFY group（＂SMFY group＂）, and Model group＋EA at acupoints of GMFY group（GMFY group）. All rats （except blank group） were made model by water immersion and restraint stress （WRS）. Then the gastric mucosa tissue in each rat was taken off alter assessment of gastric mucosal lesion index（GUI）, and the expression of ITF mRNA of the tissues was detected by reverse transcdption-polymerase chain reaction（RT-PCR） method. RESULTS： Compared with Model group（S4.3± 1.34）, the GUI value in SMFY group （31±2.211 decreased significantly（P〈0.01）, so did that in GMFY group （39.8± 1.62, P〈0.05）, meanwhile GUI value in SMFY group was significantly lower than in GMFY group（P〈0.01）. Compared with Model group （0.65±0.01）, EA had a tendency to improve the expression of gastric mucosal ITFmRNA gene： such tendency existed in GMFY group （0.66±0.01） but with no signficant difference（P〉 0.05）, in SMFY group（0.76±0.01） with an extremely obvious difference （P〈0.01）, furthermore the expression in SMFY group was significantly higher than in GMFY group （P〈 0.01）.CONCLUSION： The gastric mucosal protective effect by EA at the acupoints of SMFY and GMFY was related to the expression variance of ITF, indicating certain meridian specificity exists, It could be one proof for the TCM theory ＂Relative pardcularity between SMFY and stomach＂.展开更多
AIMTo evaluate whether repeated serum measurements of trefoil factor-3 (TFF-3) can reliably reflect mucosal healing (MH) in Crohn’s disease (CD) patients treated with anti-tumor necrosis factor-;...AIMTo evaluate whether repeated serum measurements of trefoil factor-3 (TFF-3) can reliably reflect mucosal healing (MH) in Crohn’s disease (CD) patients treated with anti-tumor necrosis factor-α (anti-TNF-α) antibodies.METHODSSerum TFF-3 was measured before and after anti-TNF-α induction therapy in 30 CD patients. The results were related to clinical, biochemical and endoscopic parameters. MH was defined as a ≥ 50% decrease in Simple Endoscopic Score for Crohn’s disease (SES-CD).RESULTSSES-CD correlated significantly with CD clinical activity and several standard biochemical parameters (albumin, leukocyte and platelet counts, C-reactive protein, erythrocyte sedimentation rate, fibrinogen). In contrast, SES-CD did not correlate with TFF-3 (P = 0.54). Moreover, TFF-3 levels did not change significantly after therapy irrespectively of whether the patients achieved MH or not. Likewise, TFF-3 did not correlate with changes in fecal calprotectin, which has been proposed as another biochemical marker of mucosal damage in CD.CONCLUSIONSerum TFF-3 is not a convenient and reliable surrogate marker of MH during therapy with TNF-α antagonists in CD.展开更多
AIM： To study the molecular forms of trefoil factor 1 （TFF1） in normal gastric mucosa and its expression in normal and abnormal gastric tissues （gastric carcinoma, atypical hyperplasia and intestinalized gastric m...AIM： To study the molecular forms of trefoil factor 1 （TFF1） in normal gastric mucosa and its expression in normal and abnormal gastric tissues （gastric carcinoma, atypical hyperplasia and intestinalized gastric mucosa） and the role of TFF1 in the carcinogenesis and progression of gastric carcinoma and its molecular biological mechanism underlying gastric mucosa protection. METHODS： The molecular forms of TFF1 in normal gastric mucosa were observed by Western blot. The expression of TFF1 in normal and abnormal gastric tissues （gastric carcinoma, atypical hyperplasia and intestinalized gastric mucosa） was also assayed by immunohistochemical method. The average positive AO was estimated by Motic Images Advanced 3.0 software. RESULTS： Three patterns of TFF1 were found in normal gastric mucosa： monomer, dimmer, and TFF1 compound whose molecular weight is about 21 kDa. The concentration of TFF1 compound was the highest among these three patterns. TFF1 was expressed mainly in epithelial cytoplasm of the mucosa in gastric body and antrum, especially around the nuclei. The closer the TFF1 to the lumen, the higher the expression of TFF1, The expression of TFF1 in peripheral tissue of gastric carcinoma （0.51 ± 0.07） was higher than that in normal gastric mucosa （0.44 ± 0.06, P 〈 0.001）. The expression of TFF1 in gastric adenocarcinoma was positively related to the differentiation of adenocarcinoma. The lower the differentiation of adenocarcinoma was, the weaker the expression of TFF1. No TFF1 was expressed in poorlydifferentiated adenocarcinoma. The expression of TFF1 in moderately-well differentiated adenocarcinoma （0.45 ± 0.07） was a little lower than that in normal mucosa （P 〉 0.05）. The expression of TFF1 in gastric mucosa with atypical hyperplasia （0.57 ± 0.03） was significantly higher than that in normal gastric mucosa （P 〈 0.001）. No TFF1 was expressed in intestinalized gastric mucosa. There was no statistically significant difference between the expressions of TFFI in gastric mucosa around the intestinalized tissue （0.45 ± 0.07） and normal gastric mucosa （P 〉 0.05）. CONCLUSION： TFF1 is expressed mainly in epithelial cytoplasm of the mucosa in gastric body and antrum. Its main pattern is TFF1 compound, which may have a greater biological activity than monomer and dimer. The expression of TFF1 in peripheral mucosa of gastric ulcer is higher than that in mucosa 5 cm beyond the ulcer, indicating that TFF1 plays an important part in protection and restitution of gastric mucosa. The expression of TFF1 is increased in peripheral tissues of gastric carcinoma and gastric mucosa with atypical hyperplasia, but is decreased in cancer tissues, implying that TFF1 may be related to suppression and differentiation of carcinoma. The weaker expression of TFF1 in poorly-differentiated carcinoma may be related to the destruction of glands and cells in cancer tissues and the decrease in secretion of TFF1.展开更多
AIM： To determine allelic imbalance on chromosomal region 21q22-qter including trefoil factor family genes （TFF） in cholangiocarcinoma （CCA） patients and analyze the correlation between allelic imbalances and cli...AIM： To determine allelic imbalance on chromosomal region 21q22-qter including trefoil factor family genes （TFF） in cholangiocarcinoma （CCA） patients and analyze the correlation between allelic imbalances and clinicopathological parameters. METHODS： Quantitative PCR amplification was performed on four microsatellite markers and trefoil factor family genes （TFF1, TFF2, and TFF3） using a standard curve and SYBR Green I dye method. The relative copy number was determined by DNA copy number of tested locus to reference locus. The relative copy number was interpreted as deletion or amplification by comparison with normal reference range. Associations between allelic imbalance and clinicopathological parameters of CCA patients were evaluated by χ^2-tests. Kaplan-Meier method was used to analyze survival. RESULTS： The frequencies of amplification at D21S1890, D21S1893, and TFF3 were 32.5%, 30.0%, and 28.7%, respectively. Patients who had amplification at regions covering D21S1893, D21S1890, and TFF showed poor prognosis, whereas patients who had deletion showed favorable prognosis （mean： 51.7 wk vs 124.82 wk, P = 0.012）. Multivariate Cox regression analysis revealed that amplification of D21S1893, D21S1890 and TFF, blood vessel invasion, and staging were associated with poor prognosis. CONCLUSION： D21S1893-D21S1890 region may harbor candidate genes especially TFF and serine protease family, which might be involved in tumor invasion and metastasis contributing to poor survival. The amplification in this region may be used as a prognostic marker in the treatment of CCA patients.展开更多
In order to investigate the protective effects of intestinal trefoil factor (ITF) on colonic mucosa in experimental colitis of rats, ITF was detected by RT-PCR and immunohistochemistry at different time points. Three ...In order to investigate the protective effects of intestinal trefoil factor (ITF) on colonic mucosa in experimental colitis of rats, ITF was detected by RT-PCR and immunohistochemistry at different time points. Three days after colitis induction, rats were treated with either 0.9 % saline solution or rhITF. Pathological changes and the expression of iNOS mRNA, NO, MDA and SOD were measured respectively. It was found that ITF was mainly located in goblet cells, significantly higher in model group than in normal group (P<0.05). rhITF could increase the iNOS mRNA expression and NO contents, and there was statistically significant difference between rhITF group and model group (P<0.05). rhITF also caused an increase of MDA and a decrease of SOD, but there was no significant difference between two groups. These results indicated that ITF has apparent therapeutic effects in ulcerative colitis, which may be associated with iNOS and NO.展开更多
BACKGROUND Stress-related gastric mucosal damage or ulcer remains an unsolved issue for critically ill patients.Stress ulcer prophylaxis has been part of routine intensive care,but uncertainty and controversy still ex...BACKGROUND Stress-related gastric mucosal damage or ulcer remains an unsolved issue for critically ill patients.Stress ulcer prophylaxis has been part of routine intensive care,but uncertainty and controversy still exist.Co-secreted with mucins,intestinal trefoil factor(ITF)is reported to promote restitution and regeneration of intestinal mucosal epithelium,although the mechanism remains unknown.AIM To elucidate the protective effects of ITF on gastric mucosa and explore the possible mechanisms.METHODS We used a rat model of gastric mucosal damage induced by water immersion restraint stress and lipopolysaccharide-treated human gastric epithelial cell line to investigate the potential effects of ITF on damaged gastric mucosa both in vivo and in vitro.RESULTS ITF promoted the proliferation and migration and inhibited necrosis of gastric mucosal epithelia in vitro.It also preserved the integrity of gastric mucosa by upregulating expressions of occludin and zonula occludens-1.In the rat model,pretreatment with ITF ameliorated the gastric mucosal epithelial damage and facilitated mucosal repair.The protective effects of ITF were confirmed to be exerted via activation of Akt signaling,and the specific inhibitor of Akt signaling LY249002 reversed the protective effects.CONCLUSION ITF might be a promising candidate for prevention and treatment of stressinduced gastric mucosal damage,and further studies should be undertaken to verify its clinical feasibility.展开更多
Background: To investigate early change of corneal aberrations after 2.8-mm superior incision phacoemulsification.Methods: This study comprised 80 eyes of 75 patients. All the patients underwent phacoemulsification wi...Background: To investigate early change of corneal aberrations after 2.8-mm superior incision phacoemulsification.Methods: This study comprised 80 eyes of 75 patients. All the patients underwent phacoemulsification with monofocal foldable intraocular lens(IOLs) implanted through a 2.8-mm superior corneal incision. The anterior corneal wavefront aberrations for the 6.0-mm pupillary diameter was measured by i Trace wavefront aberrometer(Tracey Technologies, Inc.) preoperatively and 1 month postoperatively. Changes of root mean square(RMS) values of Z(3,-3), Z(3, 3), Z(3,-1), Z(3, 1), and Z(4, 0) and total high order aberration(HOA) were evaluated.Results: The uncorrected and corrected visual acuities improve significantly(P<0.001). No significant postoperative changes were observed in spherical aberration(P=0.652). Significant changes in vertical coma and vertical trefoil(0.005±0.214 vs.-0.049±0.242, P=0.037;-0.141±0.222 vs.-0.258±0.359, P=0.001; separately). However, the total HOAs increased after cataract surgery(0.567±0.161 vs. 0.688±0.343, P<0.001).Conclusions: Corneal vertical coma and vertical trefoil changes significantly in 2.8mm superior corneal incision phacoemulsification cataract surgery. In addition, those had a trend to negative direction.展开更多
Objective：To construct a Pichia pastoris （P. pastoris） expression vector of human intestinal trefoil factor （hITF） and study its expression and purification procedures. Methods：hITF gene encoding mature peptide ...Objective：To construct a Pichia pastoris （P. pastoris） expression vector of human intestinal trefoil factor （hITF） and study its expression and purification procedures. Methods：hITF gene encoding mature peptide was modified with a polybistidine tag sequence at the N-terminal, and then inserted into the P. pastoris expression vector pGAPZaA at the downstream of the s-mating factor signal. After gene sequencing, the recombinant pGAPZaA-hITF was transformed into the P. pastoris strain X-33 with lithium chloride, rhITF was induced to constitutively express in shake flask, and then analyzed with Tricine SDS-PAGEand Western blotting. The obtained rhITF was isolated from the cultured supernatants by ammonium sulfate precipitation, Ni-NTA affinity chromatography, and ultrafiltration. Results：The correctness and integrity of rhITF were identified by restriction digestion and gene sequencing, rhITF was successfully expressed to 50 mg/L as a secretive protein. After purification, the purity was above 95%. Tricine SDS-PAGE and Western-blot analysis showed that rhITF presented as a single band with a molecular weight of 10 kDa, a little larger than 7 879 Da as assayed by mass spectrometry analysis. Conclusion： hITF P. pastoris expression vector is successfully constructed and rhITF is expressed in P. pastoris at commercially relevant level. This research lays foundation for the further functional studying of hITF.展开更多
基金Department of Chemistry,Fudan Uni-versity,the National Natural Science Foundation of China(22031003,21720102004)the Shanghai Science Technology Committee(19DZ227010O)the Alexander von Humboldt Foundation for a Humboldt Research Award.
文摘Mechanically interlocked molecules (MIMs) have unique properties with broad applications, yet constructing both knotted and linked topologies from the same ligand remains challenging due to their distinct geometric demands. To address this, we design and synthesize a conformationally adaptive ligand 4,7-bis(3-(pyridin-4-yl) phenyl) benzo[c][1,2,5]thiadiazole (L1) with a tunable torsional angle θ of N1C1C2N2 ranging from 7.5° to 108.9°. Utilizing coordination-driven self-assembly at ambient temperature, L1 selectively assembles with binuclear half-sandwich units RhB1, RhB2, RhB3, and RhB4 featuring Cp*^(Rh^(Ⅲ)) (Cp* = η^(5)-pentam-ethylcyclopentadienyl) into distinct topologies: Solomon links Rh-1, trefoil knots Rh-2, molecular tweezers Rh 3, and Rh-4, respectively. Crucially, the self-adaptability of ligand L1 directs topology formation through pro-gramming different combination of noncovalent interactions (π-x stacking, CH..π interaction, and lone pair-π interaction), thus navigating divergent assembly pathways by conformational switching, as evidenced by X-ray crystallography analysis, independent gradient model (IGM) analysis, detailed nuclear magnetic resonance (NMR) spectroscopy and electrospray ionization time-of-flight/mass spectrometry (ESI-TOF/MS). This strategy can also be extended to construct Cp*^(Irl^(Ⅲ)) analogs (Solomon links Ir-1, trefoil knots Ir-2, molecular tweezers Ir-3 and Ir-4), demonstrating metal-independent control and achieving intricate topologies in a high yield.
基金Supported by The Thailand Research Fund through the Royal Golden Jubilee PhD program(grant PHD/0121/2547 code 5LKK/47/B1 to Kosriwong K and Limpaiboon T)Khon Kaen University Research Affairs(grant 48-03-1-01-03)the Centre for Research and Development of Medical Diagnostic Laboratories,Faculty of Associated Medical Sciences(No.06-01), Thailand
文摘AIM:To investigate trefoil factor(TFF) gene copy number,mRNA and protein expression as potential biomarkers in cholangiocarcinoma(CCA).METHODS:TFF mRNA levels,gene copy number and protein expression were determined respectively by quantitative reverse transcription polymerase chain reaction(PCR),quantitative PCR and immunohistochemistry in bile duct epithelium biopsies collected from individuals with CCA,precancerous bile duct dysplasia and from disease-free controls.The functional impact of recombinant human(rh) TFF2 peptide treatment on proliferation and epidermal growth factor receptor(EGFR) /mitogenactivated protein kinase(MAPK) signaling was assessed in the CCA cell line,KMBC,by viable cell counting and immunoblotting,respectively.RESULTS:TFF1,TFF2 and TFF3 mRNA expression was significantly increased in CCA tissue compared to disease-free controls,and was unrelated to gene copy number.TFF1 immunoreactivity was strongly increased in both dysplasia and CCA,whereas TFF2 immunoreactivity was increased only in CCA compared to diseasefree controls.By contrast,TFF3 immunoreactivity was moderately decreased in dysplasia and further decreased in CCA.Kaplan-Meier analysis found no association of TFF mRNA,protein and copy number with age,gender,histological subtype,and patient survival time.Treatment of KMBC cells with rhTFF2 stimulated proliferation,triggered phosphorylation of EGFR and downstream extracellular signal related kinase(ERK),whereas co-incubation with the EGFR tyrosine kinase inhibitor,PD153035,blocked rhTFF2-dependent proliferation and EGFR/ERK responses.CONCLUSION:TFF mRNA/protein expression is indicative of CCA tumor progression,but not predictive for histological sub-type or survival time.TFF2 is mitogenic in CCA via EGFR/MAPK activation.
基金Supported by The Capital Health Development Special Scientific Research Projects,No.2014-2-2154National Natural Science Foundation of China,No.81471761 and No.81501568
文摘AIM The purpose of this study was to evaluate the diagnostic value of trefoil factor family 3(TFF3) for the early detection of colorectal cancer(CC). METHODS Serum TFF3 and carcino-embryonic antigen(CEA) were detected in 527 individuals, including 115 healthy control(HC), 198 colorectal adenoma(CA), and 214 CC individuals in the training group. RESULTS Serum TFF3 showed no significant correlation with age, gender, or tumor location but showed significant correlation with the tumor stage. Serum TFF3 in the CC group was significantly higher than in the HC or CA group. The AUC values of TFF3 for discriminating between HC and CC and between CA and CC were 0.930(0.903, 0.958) and 0.834(0.796, 0.873). A multivariate model combining TFF3 and CEA was built. Compared to TFF3 or CEA alone, the multivariate model showed significant improvement(P < 0.001). For discriminating between HC and CC, HC and early stage CC, HC and advanced stage CC, CA and CC, CA and early stage CC, and CA and advanced stage CC in the training group, the sensitivities were 92.99%, 91.46%, 93.18%, 73.83%, 76.83%, and 81.82%, and the specificities were 91.30%, 91.30%, 93.91%, 88.38%, 77.27%, and 88.38%, respectively. After validation, the sensitivities were 89.39%, 85.71%, 90.79%, 72.73%, 71.43%, and 78.95%, and the specificities were 87.85%, 87.85%, 2.52%, 87.85%, 80.77%, and 87.50%, respectively. CONCLUSION The multivariate diagnostic model that included TFF3 and CEA showed significant improvement over the conventional biomarker CEA and might provide a potential method for the early detection of CC.
文摘AIM： To study the expression of trefoil factor 1 （TFF1） and TFF2 in precancerous condition and gastric cancer and to explore the relationship between TFFs and tumorigenesis, precancerous condition and gastric cancer. METHODS： The expression of TFF1 and TFF2 was immunohistochemically analyzed in paraffin-embedded samples from 140 patients including 35 cases of chronic superficial gastritis （CSG）, 35 cases of gastric ulcer （GU）, 35 cases of chronic atrophic gastritis （CAG） and 35 cases of gastric cancer （GC）. RESULTS： TFF1 and TFF2 were located in cytoplasm of gastric mucous cells. In CSG, GU, CAG and GC, the level of TFF1 expression had a decreased tendency （P〈 0.05）. The expression of TFF2 was higher in GU than in CSG, but the difference was not significant. The expression of TFF2 also had a decreased tendency in GU, CAG, and GC （P〈 0.05）. CONCLUSION： The reduced expression of TFF1 and TFF2 in precancerous conditions and gastric cancer may be associated with the proliferation and malignant transformation of gastric mucosa. More investigations are needed to explore the mechanism of TFFs and the relationship between TFFs and gastric cancer.
基金the Natural Science Fund of the Xinjiang Uygur Autonomous Region,No.2014211C111
文摘AIM To detect the expression of trefoil factors (TFFs) and TWIST1 in colorectal cancer (CRC) and analyze their correlation with metastasis and survival. METHODS This study examined the expression of TFF1, TFF3 and TWIST1 in a total of 75 tumor samples, 47 matched normal samples (15 cm from the lesion margin), 30 metastatic lymph nodes, and 10 liver metastatic cancer samples from patients with CRC. The relationship was then analyzed between the protein expression and different clinical records. TFF1, TFF3, TWIST1, E-cadherin, vimentin and beta-catenin mRNA and protein expression levels were measured in colon cancer cell lines with different metastatic potentials (HIEC, HT29, SW620, and LoVo cells), and the correlation of the expression levels with epithelial-mesenchymal transition (EMT) was discussed. RESULTS It was found that 66.7% (50/75), 78.7% (59/75) and 54.7% (41/75) of tumor tissue samples exhibited positive staining for TFF1, TFF3 and TWIST1 and so did 27.3% (13/47), 100% (47/47) and 17% (8/47) of adjacent normal colorectal tissues. Compared with adjacent normal tissues, significant differences were found in the expression of all three proteins in different cancerous tissues (P < 0.05). Higher expression of TFF3 and TWIST1 was significantly correlated with lymph node metastasis (P = 0.034, P = 0.000), advanced stage (P = 0.031, P = 0.003), and poorer survival (P = 0.042 for the TFF3 group, P = 0.003 for the TWIST1 group). The expression of TFF3 and TWIST1 in cancer cell lines was higher than that in HIEC (a normal human intestinal epithelial cell line)(P < 0.05), and the expression intensity demonstrated a tendency to rise with increased metastatic potential both at the protein and mRNA levels. However, TFF1 expression demonstrated the opposite tendency. It was also observed that the expression of E-cadherin and beta-catenin tended to decrease while that of vimentin, TWIST1 and Snail tended to rise with the increase in metastatic potential. CONCLUSION The expression of TFF3 and TWIST1 might be associated with the survival of patients with CRC after curative resection and might be pivotal predictors of disease progression. TFF3 may be correlated to the invasiveness of CRC.
文摘Inflammatory bowel disease (IBD), which comprises ulcerative colitis and Crohn’s disease, is characterized by inflammation of the gastrointestinal tract. The trefoil factors 1, 2, and 3 (TFF1-3) are a family of peptides that play important roles in the protection and repair of epithelial surfaces, including the gastrointestinal tract. TFFs may be involved in IBD pathogenesis and are a potential treatment option. In the present review, we describe the TFF family and their potential role in IBD by summarizing the current knowledge of their expression, possible function and pharmacological role in IBD.
文摘AIM:To determine whether trefoil factor 1 (TFF1) is associated with mucosa healing and carcinoma suppression, we assess the expression of trefoil factor 1 in normal and pathologic gastric mucosa. METHODS: TFF1 in normal and pathologic gastric mucosa was assessed by immunohistochemical method, and the average positive A was estimated by Motic Images Advanced 3.0 software. RESULTS: Increased TFF1 was detected in gastritis, gastric ulcer and duodenal ulcer compared with normal mucosa. The same result could be seen in multiple and compound ulcer compared with simple ulcer. There was no significant difference between gastric ulcer and duodenal ulcer, gastritis and simple ulcer respectively. Increased TFF1 was detected in the peripheral mucosa of the gastric adenocarcinoma compared with normal mucosa. The expression of TFF1 in gastric adenocarcinoma was related to the differentiation of adenocarcinoma. The lower the differentiation of adenocarcinoma, the weaker the expression of TFF1. There was no TFF1 expressed in low-differentiated adenocarcinoma. The expression of TFF1 in middle and highly differentiated adenocarcinoma was a little lower than that in normal mucosa. But there was no significant difference. No TFF1 was assessed in esophageal squamous carcinoma and peripheral tissue. There was no significant difference between male and female. CONCLUSION: The expression of TFF1 was higher in gastritis and peptic ulcer than that in normal mucosa, and was also higher in multiple and compound ulcer than in simple ulcer. It seems that TFF1 plays a role in gastric mucosa protection and epithelial restitution. Increased expression of TFF1 in peripheral tissue suggests that TFF1 is associated with mechanism of carcinoma suppression and differentiation. Decreased expression of TFF1 in carcinoma and its relativity to the differentiation suggests that TFF1 is related to gland and cell destruction of carcinoma.
基金Supported by the National Natural Science Foundation of China No. 90209023
文摘AIM： To investigate electroacupunture（EA） at the acupoints of Stomach Meridian of Foot-Yangming（SMFY）, Gallbladder Meridian of Foot-Yangming（SMFY） on gastric mucosal intestinal trefoil factor （ITF） gene expression detection in stress-induced rats with gastric mucosal lesion, and to explore the regulatory mechanism and significance of EA-related gastric mucosal protective effect. METHODS： Forty rats were randomly divided into 4 groups： Blank group, Model group, Model group＋EA at acupoints of SMFY group（＂SMFY group＂）, and Model group＋EA at acupoints of GMFY group（GMFY group）. All rats （except blank group） were made model by water immersion and restraint stress （WRS）. Then the gastric mucosa tissue in each rat was taken off alter assessment of gastric mucosal lesion index（GUI）, and the expression of ITF mRNA of the tissues was detected by reverse transcdption-polymerase chain reaction（RT-PCR） method. RESULTS： Compared with Model group（S4.3± 1.34）, the GUI value in SMFY group （31±2.211 decreased significantly（P〈0.01）, so did that in GMFY group （39.8± 1.62, P〈0.05）, meanwhile GUI value in SMFY group was significantly lower than in GMFY group（P〈0.01）. Compared with Model group （0.65±0.01）, EA had a tendency to improve the expression of gastric mucosal ITFmRNA gene： such tendency existed in GMFY group （0.66±0.01） but with no signficant difference（P〉 0.05）, in SMFY group（0.76±0.01） with an extremely obvious difference （P〈0.01）, furthermore the expression in SMFY group was significantly higher than in GMFY group （P〈 0.01）.CONCLUSION： The gastric mucosal protective effect by EA at the acupoints of SMFY and GMFY was related to the expression variance of ITF, indicating certain meridian specificity exists, It could be one proof for the TCM theory ＂Relative pardcularity between SMFY and stomach＂.
基金the Poznan University of Medical Sciences Grant,A helping hand(2014)
文摘AIMTo evaluate whether repeated serum measurements of trefoil factor-3 (TFF-3) can reliably reflect mucosal healing (MH) in Crohn’s disease (CD) patients treated with anti-tumor necrosis factor-α (anti-TNF-α) antibodies.METHODSSerum TFF-3 was measured before and after anti-TNF-α induction therapy in 30 CD patients. The results were related to clinical, biochemical and endoscopic parameters. MH was defined as a ≥ 50% decrease in Simple Endoscopic Score for Crohn’s disease (SES-CD).RESULTSSES-CD correlated significantly with CD clinical activity and several standard biochemical parameters (albumin, leukocyte and platelet counts, C-reactive protein, erythrocyte sedimentation rate, fibrinogen). In contrast, SES-CD did not correlate with TFF-3 (P = 0.54). Moreover, TFF-3 levels did not change significantly after therapy irrespectively of whether the patients achieved MH or not. Likewise, TFF-3 did not correlate with changes in fecal calprotectin, which has been proposed as another biochemical marker of mucosal damage in CD.CONCLUSIONSerum TFF-3 is not a convenient and reliable surrogate marker of MH during therapy with TNF-α antagonists in CD.
文摘AIM： To study the molecular forms of trefoil factor 1 （TFF1） in normal gastric mucosa and its expression in normal and abnormal gastric tissues （gastric carcinoma, atypical hyperplasia and intestinalized gastric mucosa） and the role of TFF1 in the carcinogenesis and progression of gastric carcinoma and its molecular biological mechanism underlying gastric mucosa protection. METHODS： The molecular forms of TFF1 in normal gastric mucosa were observed by Western blot. The expression of TFF1 in normal and abnormal gastric tissues （gastric carcinoma, atypical hyperplasia and intestinalized gastric mucosa） was also assayed by immunohistochemical method. The average positive AO was estimated by Motic Images Advanced 3.0 software. RESULTS： Three patterns of TFF1 were found in normal gastric mucosa： monomer, dimmer, and TFF1 compound whose molecular weight is about 21 kDa. The concentration of TFF1 compound was the highest among these three patterns. TFF1 was expressed mainly in epithelial cytoplasm of the mucosa in gastric body and antrum, especially around the nuclei. The closer the TFF1 to the lumen, the higher the expression of TFF1, The expression of TFF1 in peripheral tissue of gastric carcinoma （0.51 ± 0.07） was higher than that in normal gastric mucosa （0.44 ± 0.06, P 〈 0.001）. The expression of TFF1 in gastric adenocarcinoma was positively related to the differentiation of adenocarcinoma. The lower the differentiation of adenocarcinoma was, the weaker the expression of TFF1. No TFF1 was expressed in poorlydifferentiated adenocarcinoma. The expression of TFF1 in moderately-well differentiated adenocarcinoma （0.45 ± 0.07） was a little lower than that in normal mucosa （P 〉 0.05）. The expression of TFF1 in gastric mucosa with atypical hyperplasia （0.57 ± 0.03） was significantly higher than that in normal gastric mucosa （P 〈 0.001）. No TFF1 was expressed in intestinalized gastric mucosa. There was no statistically significant difference between the expressions of TFFI in gastric mucosa around the intestinalized tissue （0.45 ± 0.07） and normal gastric mucosa （P 〉 0.05）. CONCLUSION： TFF1 is expressed mainly in epithelial cytoplasm of the mucosa in gastric body and antrum. Its main pattern is TFF1 compound, which may have a greater biological activity than monomer and dimer. The expression of TFF1 in peripheral mucosa of gastric ulcer is higher than that in mucosa 5 cm beyond the ulcer, indicating that TFF1 plays an important part in protection and restitution of gastric mucosa. The expression of TFF1 is increased in peripheral tissues of gastric carcinoma and gastric mucosa with atypical hyperplasia, but is decreased in cancer tissues, implying that TFF1 may be related to suppression and differentiation of carcinoma. The weaker expression of TFF1 in poorly-differentiated carcinoma may be related to the destruction of glands and cells in cancer tissues and the decrease in secretion of TFF1.
基金Supported by the Research Grants from Khon Kaen University, No. 48-03-1-01-03 the Center for Research and Development in Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, No 06-01
文摘AIM： To determine allelic imbalance on chromosomal region 21q22-qter including trefoil factor family genes （TFF） in cholangiocarcinoma （CCA） patients and analyze the correlation between allelic imbalances and clinicopathological parameters. METHODS： Quantitative PCR amplification was performed on four microsatellite markers and trefoil factor family genes （TFF1, TFF2, and TFF3） using a standard curve and SYBR Green I dye method. The relative copy number was determined by DNA copy number of tested locus to reference locus. The relative copy number was interpreted as deletion or amplification by comparison with normal reference range. Associations between allelic imbalance and clinicopathological parameters of CCA patients were evaluated by χ^2-tests. Kaplan-Meier method was used to analyze survival. RESULTS： The frequencies of amplification at D21S1890, D21S1893, and TFF3 were 32.5%, 30.0%, and 28.7%, respectively. Patients who had amplification at regions covering D21S1893, D21S1890, and TFF showed poor prognosis, whereas patients who had deletion showed favorable prognosis （mean： 51.7 wk vs 124.82 wk, P = 0.012）. Multivariate Cox regression analysis revealed that amplification of D21S1893, D21S1890 and TFF, blood vessel invasion, and staging were associated with poor prognosis. CONCLUSION： D21S1893-D21S1890 region may harbor candidate genes especially TFF and serine protease family, which might be involved in tumor invasion and metastasis contributing to poor survival. The amplification in this region may be used as a prognostic marker in the treatment of CCA patients.
文摘In order to investigate the protective effects of intestinal trefoil factor (ITF) on colonic mucosa in experimental colitis of rats, ITF was detected by RT-PCR and immunohistochemistry at different time points. Three days after colitis induction, rats were treated with either 0.9 % saline solution or rhITF. Pathological changes and the expression of iNOS mRNA, NO, MDA and SOD were measured respectively. It was found that ITF was mainly located in goblet cells, significantly higher in model group than in normal group (P<0.05). rhITF could increase the iNOS mRNA expression and NO contents, and there was statistically significant difference between rhITF group and model group (P<0.05). rhITF also caused an increase of MDA and a decrease of SOD, but there was no significant difference between two groups. These results indicated that ITF has apparent therapeutic effects in ulcerative colitis, which may be associated with iNOS and NO.
基金Social Development Projects of Jiangsu Province,No.BE2017720the National Natural Science Foundation of China,No.81701894+4 种基金Jiangsu Provincial Medical Youth Talent,No.QNRC2016909 and No.QNRC2016908Natural Science Foundation of Jiangsu Province,No.BK20190247Science Foundation of Jiangsu Health Commission,No.H2018039China Postdoctoral Science Foundation,No.2018M643890Jiangsu Postdoctoral Science Foundation,No.2018K048A and No.2020Z193。
文摘BACKGROUND Stress-related gastric mucosal damage or ulcer remains an unsolved issue for critically ill patients.Stress ulcer prophylaxis has been part of routine intensive care,but uncertainty and controversy still exist.Co-secreted with mucins,intestinal trefoil factor(ITF)is reported to promote restitution and regeneration of intestinal mucosal epithelium,although the mechanism remains unknown.AIM To elucidate the protective effects of ITF on gastric mucosa and explore the possible mechanisms.METHODS We used a rat model of gastric mucosal damage induced by water immersion restraint stress and lipopolysaccharide-treated human gastric epithelial cell line to investigate the potential effects of ITF on damaged gastric mucosa both in vivo and in vitro.RESULTS ITF promoted the proliferation and migration and inhibited necrosis of gastric mucosal epithelia in vitro.It also preserved the integrity of gastric mucosa by upregulating expressions of occludin and zonula occludens-1.In the rat model,pretreatment with ITF ameliorated the gastric mucosal epithelial damage and facilitated mucosal repair.The protective effects of ITF were confirmed to be exerted via activation of Akt signaling,and the specific inhibitor of Akt signaling LY249002 reversed the protective effects.CONCLUSION ITF might be a promising candidate for prevention and treatment of stressinduced gastric mucosal damage,and further studies should be undertaken to verify its clinical feasibility.
文摘Background: To investigate early change of corneal aberrations after 2.8-mm superior incision phacoemulsification.Methods: This study comprised 80 eyes of 75 patients. All the patients underwent phacoemulsification with monofocal foldable intraocular lens(IOLs) implanted through a 2.8-mm superior corneal incision. The anterior corneal wavefront aberrations for the 6.0-mm pupillary diameter was measured by i Trace wavefront aberrometer(Tracey Technologies, Inc.) preoperatively and 1 month postoperatively. Changes of root mean square(RMS) values of Z(3,-3), Z(3, 3), Z(3,-1), Z(3, 1), and Z(4, 0) and total high order aberration(HOA) were evaluated.Results: The uncorrected and corrected visual acuities improve significantly(P<0.001). No significant postoperative changes were observed in spherical aberration(P=0.652). Significant changes in vertical coma and vertical trefoil(0.005±0.214 vs.-0.049±0.242, P=0.037;-0.141±0.222 vs.-0.258±0.359, P=0.001; separately). However, the total HOAs increased after cataract surgery(0.567±0.161 vs. 0.688±0.343, P<0.001).Conclusions: Corneal vertical coma and vertical trefoil changes significantly in 2.8mm superior corneal incision phacoemulsification cataract surgery. In addition, those had a trend to negative direction.
基金Supported by the National Natural Science Foundation of China (No. 30200294)
文摘Objective：To construct a Pichia pastoris （P. pastoris） expression vector of human intestinal trefoil factor （hITF） and study its expression and purification procedures. Methods：hITF gene encoding mature peptide was modified with a polybistidine tag sequence at the N-terminal, and then inserted into the P. pastoris expression vector pGAPZaA at the downstream of the s-mating factor signal. After gene sequencing, the recombinant pGAPZaA-hITF was transformed into the P. pastoris strain X-33 with lithium chloride, rhITF was induced to constitutively express in shake flask, and then analyzed with Tricine SDS-PAGEand Western blotting. The obtained rhITF was isolated from the cultured supernatants by ammonium sulfate precipitation, Ni-NTA affinity chromatography, and ultrafiltration. Results：The correctness and integrity of rhITF were identified by restriction digestion and gene sequencing, rhITF was successfully expressed to 50 mg/L as a secretive protein. After purification, the purity was above 95%. Tricine SDS-PAGE and Western-blot analysis showed that rhITF presented as a single band with a molecular weight of 10 kDa, a little larger than 7 879 Da as assayed by mass spectrometry analysis. Conclusion： hITF P. pastoris expression vector is successfully constructed and rhITF is expressed in P. pastoris at commercially relevant level. This research lays foundation for the further functional studying of hITF.
