Background:Recent years have witnessed the rapid rise of TikTok,a short-video social platform,which has sparked concerns about its potential for misuse and addiction.TikTok addiction has been associated with various p...Background:Recent years have witnessed the rapid rise of TikTok,a short-video social platform,which has sparked concerns about its potential for misuse and addiction.TikTok addiction has been associated with various psychological and social issues.This study aims to explore the mediating role of social ostracism in the relationship between the Dark Triad(Machiavellianism,Psychopathy,and Narcissism)and TikTok addiction.Methods:Data were collected from 425 Chinese college students through convenience sampling,using three validated scales:the Dirty Dozen,the Social Ostracism Scale,and the Bergen Social Media Addiction Scale.Structural Equation Modeling(SEM)with AMOS 24 revealed significant patterns.Results:Narcissism had direct positive effects on both social ostracism(β0.115,p 0.01)and TikTok addiction(β0.223,p 0.05),while Psychopathy only had a direct positive effect=<=<on social ostracism(β0.147,p 0.05).Contrary to expectations,Machiavellianism did not show significant direct=<effects on either social ostracism(βp 0.05)or TikTok addiction(β0.135,p 0.05).Mediation analysis=-0.031,>=>confirmed that social ostracism acted as a positive mediator,amplifying the effects of Psychopathy(β0.049,p 0.05)=<and Narcissism(β0.052,p 0.01)on TikTok addiction.In other words,higher levels of Psychopathy and Narcissism=<were linked to greater experiences of social ostracism,which in turn were linked to higher levels of TikTok addiction.Conclusion:These findings suggest an important role for social ostracism in linking Narcissism and Psychopathy to TikTok addiction.Addressing social ostracism and these dark personality traits through targeted interventions may be important in reducing TikTok addiction risks among individuals with such traits.展开更多
目的探讨Force Triad能量平台中血管结扎闭合系统（结扎束）在阴式子宫全切术（Transvaginal total hysterectomy,TVH）中的应用价值。方法 2013年4~12月住院患者60例,随机分成观察组（ligasuren血管闭合系统组）与对照组（传统手术组）...目的探讨Force Triad能量平台中血管结扎闭合系统（结扎束）在阴式子宫全切术（Transvaginal total hysterectomy,TVH）中的应用价值。方法 2013年4~12月住院患者60例,随机分成观察组（ligasuren血管闭合系统组）与对照组（传统手术组）,比较两组间在手术时间、术中出血量、术后排气时间、术后发热时间、术后离床活动时间以及平均住院天数等情况。结果观察组手术时间、术中出血量、术后离床活动时间及平均住院时间明显少于开腹手术组（P〈0.05）,差异有统计学意义;术后排气时间、术后发热时间差异均无显著性（P〉0.05）。结论 Ligasuren血管闭合系统在阴式子宫全切手术的应用方面有一定的优势,可以更有效地闭合血管,减少出血量及缩短手术时间,减少术后并发症等优点,值得推广。展开更多
以往人们多认为QT间期延长是药源性尖端扭转性室性心动过速(TdP)的重要机制。但是QT间期延长并不都能引发TdP,而TdP的发生也并不都伴随着QT间期延长,甚至在一些QT间期缩短的情况下,也有恶性室性心律失常的发生。因此近年来有学者提出TR...以往人们多认为QT间期延长是药源性尖端扭转性室性心动过速(TdP)的重要机制。但是QT间期延长并不都能引发TdP,而TdP的发生也并不都伴随着QT间期延长,甚至在一些QT间期缩短的情况下,也有恶性室性心律失常的发生。因此近年来有学者提出TRIaD的概念,其为心肌细胞动作电位三角形化(triangulation)、逆向频率依赖性(reverse use dependency)、不稳定性(instability)以及离散(dispersion)等指标的合称。越来越多的研究证明,TRIaD指标的变化是药源性TdP发生的共同基质;药物应用后表现出动作电位三角形化、逆向频率依赖性、不稳定性、离散增加等反应,无论有无QT间期的延长,均易发生室性心律失常,包括TdP。反之,即使QT间期延长,致心律失常作用也很小。展开更多
AIM: To evaluate the expression of fragile histidine triad (FHIT) gene protein, product of a candidate tumor suppressor, and to investigate the relationship between FHIT, cell apoptosis and proliferation, and patholog...AIM: To evaluate the expression of fragile histidine triad (FHIT) gene protein, product of a candidate tumor suppressor, and to investigate the relationship between FHIT, cell apoptosis and proliferation, and pathological features of primary hepatocellular carcinoma (HCC). METHODS: Forty-seven HCC and ten normal liver specimens were collected during surgical operation between 2001 and 2003. FHIT and proliferating cell nuclear antigen (PCNA) expression were detected by immunohistochemistry, and apoptotic level was evaluated by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assay on the tissue sections. RESULTS: All normal liver tissues showed a strong expression of FHIT, whereas 28 of 47 (59.6%) carcinomas showed a significant loss or absence of FHIT expression (P= 0.001). The proportion of reduced FHIT expression in those carcinomas at stages Ⅲ-Ⅳ (70.6%) and in those with extrahepatic metastasis (86.7%) showed an increasing trend compared with those at stages HI (30.8%, P= 0.013) and those without metastasis (46.9%, P = 0.010) respectively. Apoptotic incidence in advanced TNM stage carcinoma and those with positive FHIT expression was higher than that in early stage carcinoma (P=0.030) and in those with negative FHIT expression (P=0.044) respectively. The proliferating potential of hepatocellular carcinoma was associated with FHIT expression (P= 0.016) and the aggressive feature (P = 0.019). Kaplan-Meier analysis demonstrated that the survival time of these 47 patients correlated with TNM stage, FHIT expression and metastasis. CONCLUSION: There is marked loss or absence of FHIT expression, as well as abnormal apoptosis-prdiferation balance in HCC. FHIT may play an important role in carcinogenesis and development of HCC.展开更多
Besides obvious benefits,the Three Gorges Dam＇s construction resulted in new pollution scenarios with the potentials to threaten the Three Gorges Reservoir（TGR） ecosystem.In order to record organic contamination,to...Besides obvious benefits,the Three Gorges Dam＇s construction resulted in new pollution scenarios with the potentials to threaten the Three Gorges Reservoir（TGR） ecosystem.In order to record organic contamination,to find links to ecotoxicological impacts and to serve as reference for ensuing monitoring,several sites in the TGR area were screened applying the triad approach with additional lines-of-evidence as a holistic assessment method.Sediments and the benthic fish species Pelteobagrus vachellii were sampled in 2011 and 2012 to determine organic pollution levels,mutagenic potentials and genotoxic impacts.Two regional hot-spots near the cities of Chongqing and Kaixian were identified and further investigated in 2013.Only polycyclic aromatic hydrocarbons（PAHs） could be detected in sediments in 2011（165-1653 ng/g）,emphasizing their roles as key pollutants of the area.Their ubiquity was confirmed at Chongqing（150-433 ng/g） and Kaixian（127-590 ng/g） in2013.Concentrations were comparable to other major Chinese and German rivers.However,the immense sediment influx suggested a deposition of 216-636 kg PAH/day（0.2-0.6 mg PAH/（m2·day））,indicating an ecotoxicological risk.PAH source analysis highlighted primary impacts of combustion sources on the more industrialized upper TGR section,whereas petrogenic sources dominated the mid-low section.Furthermore,sediment extracts from several sites exhibited significant activities of frameshift promutagens in the Ames fluctuation assay.Additionally,significant genotoxic impairments in erythrocytes of P.vachellii were detected（Chongqing/Kaixian）,demonstrating the relevance of genotoxicity as animportant mode of action in the TGR＇s fish.PAHs,their derivatives and non-target compounds are considered as main causative agents.展开更多
AIM: To examine the aberrant expression of fragile histidine triad (FHIT) gene and protein in gastric cancer, and to evaluate the role of FHIT gene and the relationship between FHIT gene and EBV infection in gastric c...AIM: To examine the aberrant expression of fragile histidine triad (FHIT) gene and protein in gastric cancer, and to evaluate the role of FHIT gene and the relationship between FHIT gene and EBV infection in gastric carcinogenesis. METHODS: FHIT transcripts were detected by nested RT-PCR in 30 cases of gastric cancer and their products were sequenced.FHIT protein was detected by Western blot. EBV infection was detected by PCR method in 50 cases of gastric cancer. RESULTS: The wild type transcripts were detected in all 30 matched normal tissues of gastric cancer.Aberrant transcripts were found in 11/30 (36.7%) gastric cancerous tissues. Sequencing analysis of the aberrant fragments found an RT-PCR product missing exons 5-7 in one case of gastric cancer, and another product missing exons 4-7. Four of ten (40.0%) cases of primary gastric cancer showed absent or decreased expression of FHIT protein as compared with their matched normal tissues.EBV was detected in 5/50 (10%) gastric cancers,among which 4/5 (80%) had aberrant transcripts of FHIT gene. CONCLUSION: Loss of FHIT gene or FHIT protein plays an important role in carcinogenesis,development and progression of gastric cancer.EBV infection might influence carcinogenesis of gastric cancer by inducing the abnormality of FHIT gene.展开更多
AIM： To detect the expression of fragile histidine triad （FHIT） in normal colorectal tissue, colorectal adenoma and colorectal cancer （CRC） tissue, and to analyze its relationship with the clinicopathological fea...AIM： To detect the expression of fragile histidine triad （FHIT） in normal colorectal tissue, colorectal adenoma and colorectal cancer （CRC） tissue, and to analyze its relationship with the clinicopathological features of CRC, and apoptosis-associatecl proteins （Bcl-2, Bax, survivin） and apoptosis in colorectal cancer. METHODS： FHIT mRNA analysis was performed by nested reverse transcription-polymerase chain reaction （RT-PCR） assay. Tissue microarray （TMA） was established to detect the expression of FHIT, Bcl-2, Bax and survivin genes in 80 CRC tissue specimens, 16 colorectal adenoma tissue specimens and 16 hemorrhoid （PPH） tissue specimens during the same period of time as the control. Citrate-microwave-SP was used as immunohistochemical method. The relationship between clinicopathological factors, such as differentiation grades and 5-year survival rate was observed. TUNEL assay was used to detect the apoptosis index in 80 CRC tissue specimens. RESULTS： Ten out of 26 （38.5%） CRC tissue specimens expressed aberrant FHIT transcripts, none of the aberrant FHIT transcripts was observed in the matchednormal tissue and colorectal adenoma tissue by nested RT-PCR assay. The positive rate of FHIT gene expression in normal colorectal tissue, colorectal adenoma and carcinoma tissue was 93.75%, 68.75% and 46.25%, respectively. Clinicopathological analysis of patients showed that the decreased FHIT gene expression was not associated with age, sex, serum CEA levels, tumor site and size, histological classification. However, the expression of FHIT was correlated with differentiation grades, pathological stages, lymph node metastases and 5-year survival rate after operation. The positive rate of apoptosis-associated proteins （Bax, Bcl-2 and survivin） in CRC tissue was 72.50%, 51.25% and 77.50%, respectively. The expression of these apoptosisassociated proteins in CRC tissue was correlated with the expression of FHIT. The mean apoptosis index in FHIT negative tumors was significantly lower than that in FHIT- positive tumors （5.41 ± 0.23 vs 0.56 ± 0.10, P 〈 0.01）. CONCLUSION： The FHIT gene plays an important role in the regulation of apoptosis and decreased FHIT expression plays a key role in the initiation and progression of colorectal carcinoma.展开更多
In this paper, a new transient forced quasi-resonant triad interaction theory in a beta channel is proposed to investigate the interaction between planetary-scale diffluent flow composed of zonal wavenumbers 1-3 and s...In this paper, a new transient forced quasi-resonant triad interaction theory in a beta channel is proposed to investigate the interaction between planetary-scale diffluent flow composed of zonal wavenumbers 1-3 and synoptic-scale waves produced continuously by a synoptic-scale vorticity source fixed upstream of an incipient blocking region during the life cycle of blocking. It is shown that the superposition of initial three Rossby waves for zonal wavenumbers 1 （monopole）, 2 （dipole）, and 3 （monopole）, which permit triad quasi-resonance, can represent an incipient blocking event. The synoptic-scale eddies may act to amplify the incipient blocking and to excite a blocking circulation with a strong meander, whose flow pattern depends on the initial amplitudes of the planetary waves and both the intensity and location of preexisting synoptic-scale waves. The onset （decay） of the planetary-scale split-flow blocking is mainly represented by a strong increase （decrease） in the amplitude of the zonal wavenumber 2 component, having a dipole meridional structure related to the preexisting synoptic-scale eddies. The typical persistence time of the model blocking was of about 20 days, consistent with observations of blocking patterns. In our model, isolated asymmetric dipole blocking is formed by synoptic-scale waves. The instantaneous fields of total streamfunctions exhibit a remarkable resemblance to the synoptic maps observed during the life cycle of blocking. During the onset stage, the synoptic-scale waves are enhanced and split into two branches around the blocking region due to the feedback of the amplified blocking, in agreement with the observed changes of synoptic-scale waves in real blocking events. In addition, a diagnostic case study of blocking is presented to confirm the forced quasi-resonant triad interaction theory proposed here.展开更多
In order to demonstrate the relationship between methylation of fragile histidine triad(FHIT)and T-cadherin/H-cadherin(CDH13)genes and liver cancer,the methylation status of FHIT and CDH13 was detected in healthy indi...In order to demonstrate the relationship between methylation of fragile histidine triad(FHIT)and T-cadherin/H-cadherin(CDH13)genes and liver cancer,the methylation status of FHIT and CDH13 was detected in healthy individuals and in Mongolian and Han patients with liver cancer.The phenol-chloroform method was used to extract genomic DNA.The methylation specific polymerase chain reaction method was applied to detect the methylation status of FHIT and CDH13.The relationship between smoking and alcohol consumption and gene(FHIT and CDH13)methylation was analyzed.There was significant difference in methylation rate of FHIT(72.67%,34.67%)and CDH13(72.0%,28.0%)between liver cancer patients and healthy individuals of Mongolian descent(P<0.05),as well as that of FHIT(68%,30.67%)and CDH13(64%,26%)between liver cancer patients and healthy individuals of Han individuals(P<0.05).There was also a relationship between smoking and drinking and the methylation of FHIT and CDH13(P<0.05).Thus,the methylation of FHIT and CDH13 had a relationship with liver cancer incidence.Smoking and alcohol ingestion may promote the methylation of FHIT and CDH13.展开更多
AIM:To evaluate the inhibitory effects of human fragile histidine triad(FHIT) gene on cell proliferation and apoptosis in human hepatocellular carcinoma line Hep3B in vitro. METHODS:A recombinant pcDNA3.1(+) /FHIT inc...AIM:To evaluate the inhibitory effects of human fragile histidine triad(FHIT) gene on cell proliferation and apoptosis in human hepatocellular carcinoma line Hep3B in vitro. METHODS:A recombinant pcDNA3.1(+) /FHIT including the functional region of FHIT gene was constructed and transferred into human hepatocellular carcinoma cells in vitro. mRNA and protein expression of the FHIT gene in the transfected cells was detected by RT-PCR and Western blot,respectively. The effect of FHIT on proliferation was detected by MTT assay. Changes in cell cycle and apoptosis were assayed by flow cytometry. Five mice received subcutaneous transplantation of Hep3B-FHIT;5 mice received subcutaneous transplantation of normal Hep3B and Hep3B-C as controls. The body weight of nude mice and tumor growth were measured. RESULTS:RT-PCR and Western blot analysis showed that the expression level of FHIT-mRNA and FHIT protein was higher in Hep3B cells after infection withpcDNA3.1(+) /FHIT. The growth of Hep3B cells treated with pcDNA3.1(+) /FHIT was significantly inhibited. The pcDNA3.1(+) /FHIT-transfected Hep3B cells showed a significantly higher cell rate at G0-G1 phase and increased apoptosis in comparison with controls(P < 0.05) . The growth of transplanted tumor was inhibited markedly by FHIT. Tumors arising from the Hep3B-FHIT cells occurred much later than those arising from the Hep3B and Hep3B-C cells. The growth of Hep3B-FHIT cells was slow and the tumor volume was low. CONCLUSION:Transduction of FHIT gene inhibits the growth of human hepatocellular carcinoma cells and induces cell apoptosis in vivo and in vitro.展开更多
AIM:To analyze stress fractures in athletes based on experience from our sports medicine clinic.METHODS:We investigated the association between stress fractures and age,sex,sports level,sports activity,and skeletal si...AIM:To analyze stress fractures in athletes based on experience from our sports medicine clinic.METHODS:We investigated the association between stress fractures and age,sex,sports level,sports activity,and skeletal site in athletes seen at our sports medicine clinic between September 1991 and April 2009.Stress fractures of the pars interarticularis were excluded from this analysis.RESULTS:During this period(18 years and 8 mo),14276 patients(9215 males and 5061 females)consulted our clinic because of sports-related injuries,and 263 patients(1.8%)[171 males(1.9%)and 92 females(1.8%)]sustained stress fractures.The average age of the patients with stress fractures was 20.2 years(range 10-46 years);112 patients(42.6%)were 15-19 years of age and 90(34.2%)were 20-24 years of age.Altogether,90 patients(34.2%)were active at a high recreational level and 173(65.8%)at a competitive level.The highest proportion of stress fractures was seen in basketball athletes(21.3%),followed by baseball(13.7%),track and field(11.4%),rowing(9.5%),soccer(8.4%),aerobics(5.3%),and classical ballet(4.9%).The most common sites of stress fractures in these patients were the tibia(44.1%),followed by the rib(14.1%),metatarsal bone(12.9%),ulnar olecranon(8.7%)and pelvis(8.4%).The sites of the stress fractures varied from sport to sport.The ulnar olecranon was the most common stress fracture site in baseball players,and the rib was the most common in rowers.Basketball and classical ballet athletes predominantly sustained stress fractures of the tibia and metatarsal bone.Track and field and soccer athletes predominantly sustained stress fractures of the tibia and pubic bone.Aerobics athletes predominantly sustained stress fractures of the tibia.Middle and long distance female runners who sustained multiple stress fractures had the female athlete triad.CONCLUSION:The results of this analysis showed that stress fractures were seen in high-level young athletes,with similar proportions for males and females,and that particular sports were associated with specific sites for stress fractures.Middle and long distance female runners who suffered from multiple stress fractures had the female athlete triad.展开更多
基金reported in this paper represents a contribution to“Research Project on the Construction of Smart Teaching Capabilities in New Era Mingde College English(Grant No.2022YB0099)”at Henan Provincial Department of Education.
文摘Background:Recent years have witnessed the rapid rise of TikTok,a short-video social platform,which has sparked concerns about its potential for misuse and addiction.TikTok addiction has been associated with various psychological and social issues.This study aims to explore the mediating role of social ostracism in the relationship between the Dark Triad(Machiavellianism,Psychopathy,and Narcissism)and TikTok addiction.Methods:Data were collected from 425 Chinese college students through convenience sampling,using three validated scales:the Dirty Dozen,the Social Ostracism Scale,and the Bergen Social Media Addiction Scale.Structural Equation Modeling(SEM)with AMOS 24 revealed significant patterns.Results:Narcissism had direct positive effects on both social ostracism(β0.115,p 0.01)and TikTok addiction(β0.223,p 0.05),while Psychopathy only had a direct positive effect=<=<on social ostracism(β0.147,p 0.05).Contrary to expectations,Machiavellianism did not show significant direct=<effects on either social ostracism(βp 0.05)or TikTok addiction(β0.135,p 0.05).Mediation analysis=-0.031,>=>confirmed that social ostracism acted as a positive mediator,amplifying the effects of Psychopathy(β0.049,p 0.05)=<and Narcissism(β0.052,p 0.01)on TikTok addiction.In other words,higher levels of Psychopathy and Narcissism=<were linked to greater experiences of social ostracism,which in turn were linked to higher levels of TikTok addiction.Conclusion:These findings suggest an important role for social ostracism in linking Narcissism and Psychopathy to TikTok addiction.Addressing social ostracism and these dark personality traits through targeted interventions may be important in reducing TikTok addiction risks among individuals with such traits.
文摘以往人们多认为QT间期延长是药源性尖端扭转性室性心动过速(TdP)的重要机制。但是QT间期延长并不都能引发TdP,而TdP的发生也并不都伴随着QT间期延长,甚至在一些QT间期缩短的情况下,也有恶性室性心律失常的发生。因此近年来有学者提出TRIaD的概念,其为心肌细胞动作电位三角形化(triangulation)、逆向频率依赖性(reverse use dependency)、不稳定性(instability)以及离散(dispersion)等指标的合称。越来越多的研究证明,TRIaD指标的变化是药源性TdP发生的共同基质;药物应用后表现出动作电位三角形化、逆向频率依赖性、不稳定性、离散增加等反应,无论有无QT间期的延长,均易发生室性心律失常,包括TdP。反之,即使QT间期延长,致心律失常作用也很小。
文摘AIM: To evaluate the expression of fragile histidine triad (FHIT) gene protein, product of a candidate tumor suppressor, and to investigate the relationship between FHIT, cell apoptosis and proliferation, and pathological features of primary hepatocellular carcinoma (HCC). METHODS: Forty-seven HCC and ten normal liver specimens were collected during surgical operation between 2001 and 2003. FHIT and proliferating cell nuclear antigen (PCNA) expression were detected by immunohistochemistry, and apoptotic level was evaluated by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assay on the tissue sections. RESULTS: All normal liver tissues showed a strong expression of FHIT, whereas 28 of 47 (59.6%) carcinomas showed a significant loss or absence of FHIT expression (P= 0.001). The proportion of reduced FHIT expression in those carcinomas at stages Ⅲ-Ⅳ (70.6%) and in those with extrahepatic metastasis (86.7%) showed an increasing trend compared with those at stages HI (30.8%, P= 0.013) and those without metastasis (46.9%, P = 0.010) respectively. Apoptotic incidence in advanced TNM stage carcinoma and those with positive FHIT expression was higher than that in early stage carcinoma (P=0.030) and in those with negative FHIT expression (P=0.044) respectively. The proliferating potential of hepatocellular carcinoma was associated with FHIT expression (P= 0.016) and the aggressive feature (P = 0.019). Kaplan-Meier analysis demonstrated that the survival time of these 47 patients correlated with TNM stage, FHIT expression and metastasis. CONCLUSION: There is marked loss or absence of FHIT expression, as well as abnormal apoptosis-prdiferation balance in HCC. FHIT may play an important role in carcinogenesis and development of HCC.
基金the Tongji University, Shanghai, and the Chongqing University, Chongqing, as part of the MICROTOX project ("Transformation, Bioaccumulation and Toxicity of Organic Micropollutants in the Yangtze Three Gorges Reservoir" No. FKZ 02WT1141)+5 种基金the Sino-German joint environmental research program "Yangtze-Hydro - Sustainable Management of the Newly Created Ecosystem at the Three Gorges Dam" (No. FKZ 02WT Bergmann et al. (2011) www.yangtzeproject.de)part of the research cluster "Pollutants/Water/Sediment-Impacts of Transformation and Transportation Processes on the Yangtze Water Quality"supported by a cooperation project with Chinese colleagues also sponsored by the Federal Ministry of Education and Research, Germany (No. DLR FKZ 01DO12007)the Chinese 111 Program
文摘Besides obvious benefits,the Three Gorges Dam＇s construction resulted in new pollution scenarios with the potentials to threaten the Three Gorges Reservoir（TGR） ecosystem.In order to record organic contamination,to find links to ecotoxicological impacts and to serve as reference for ensuing monitoring,several sites in the TGR area were screened applying the triad approach with additional lines-of-evidence as a holistic assessment method.Sediments and the benthic fish species Pelteobagrus vachellii were sampled in 2011 and 2012 to determine organic pollution levels,mutagenic potentials and genotoxic impacts.Two regional hot-spots near the cities of Chongqing and Kaixian were identified and further investigated in 2013.Only polycyclic aromatic hydrocarbons（PAHs） could be detected in sediments in 2011（165-1653 ng/g）,emphasizing their roles as key pollutants of the area.Their ubiquity was confirmed at Chongqing（150-433 ng/g） and Kaixian（127-590 ng/g） in2013.Concentrations were comparable to other major Chinese and German rivers.However,the immense sediment influx suggested a deposition of 216-636 kg PAH/day（0.2-0.6 mg PAH/（m2·day））,indicating an ecotoxicological risk.PAH source analysis highlighted primary impacts of combustion sources on the more industrialized upper TGR section,whereas petrogenic sources dominated the mid-low section.Furthermore,sediment extracts from several sites exhibited significant activities of frameshift promutagens in the Ames fluctuation assay.Additionally,significant genotoxic impairments in erythrocytes of P.vachellii were detected（Chongqing/Kaixian）,demonstrating the relevance of genotoxicity as animportant mode of action in the TGR＇s fish.PAHs,their derivatives and non-target compounds are considered as main causative agents.
基金Supported by the National Natural Science Foundation of China,No. 30371607
文摘AIM: To examine the aberrant expression of fragile histidine triad (FHIT) gene and protein in gastric cancer, and to evaluate the role of FHIT gene and the relationship between FHIT gene and EBV infection in gastric carcinogenesis. METHODS: FHIT transcripts were detected by nested RT-PCR in 30 cases of gastric cancer and their products were sequenced.FHIT protein was detected by Western blot. EBV infection was detected by PCR method in 50 cases of gastric cancer. RESULTS: The wild type transcripts were detected in all 30 matched normal tissues of gastric cancer.Aberrant transcripts were found in 11/30 (36.7%) gastric cancerous tissues. Sequencing analysis of the aberrant fragments found an RT-PCR product missing exons 5-7 in one case of gastric cancer, and another product missing exons 4-7. Four of ten (40.0%) cases of primary gastric cancer showed absent or decreased expression of FHIT protein as compared with their matched normal tissues.EBV was detected in 5/50 (10%) gastric cancers,among which 4/5 (80%) had aberrant transcripts of FHIT gene. CONCLUSION: Loss of FHIT gene or FHIT protein plays an important role in carcinogenesis,development and progression of gastric cancer.EBV infection might influence carcinogenesis of gastric cancer by inducing the abnormality of FHIT gene.
基金Supported by the Natural Science Foundation of Guangdong Province, No. 06020005
文摘AIM： To detect the expression of fragile histidine triad （FHIT） in normal colorectal tissue, colorectal adenoma and colorectal cancer （CRC） tissue, and to analyze its relationship with the clinicopathological features of CRC, and apoptosis-associatecl proteins （Bcl-2, Bax, survivin） and apoptosis in colorectal cancer. METHODS： FHIT mRNA analysis was performed by nested reverse transcription-polymerase chain reaction （RT-PCR） assay. Tissue microarray （TMA） was established to detect the expression of FHIT, Bcl-2, Bax and survivin genes in 80 CRC tissue specimens, 16 colorectal adenoma tissue specimens and 16 hemorrhoid （PPH） tissue specimens during the same period of time as the control. Citrate-microwave-SP was used as immunohistochemical method. The relationship between clinicopathological factors, such as differentiation grades and 5-year survival rate was observed. TUNEL assay was used to detect the apoptosis index in 80 CRC tissue specimens. RESULTS： Ten out of 26 （38.5%） CRC tissue specimens expressed aberrant FHIT transcripts, none of the aberrant FHIT transcripts was observed in the matchednormal tissue and colorectal adenoma tissue by nested RT-PCR assay. The positive rate of FHIT gene expression in normal colorectal tissue, colorectal adenoma and carcinoma tissue was 93.75%, 68.75% and 46.25%, respectively. Clinicopathological analysis of patients showed that the decreased FHIT gene expression was not associated with age, sex, serum CEA levels, tumor site and size, histological classification. However, the expression of FHIT was correlated with differentiation grades, pathological stages, lymph node metastases and 5-year survival rate after operation. The positive rate of apoptosis-associated proteins （Bax, Bcl-2 and survivin） in CRC tissue was 72.50%, 51.25% and 77.50%, respectively. The expression of these apoptosisassociated proteins in CRC tissue was correlated with the expression of FHIT. The mean apoptosis index in FHIT negative tumors was significantly lower than that in FHIT- positive tumors （5.41 ± 0.23 vs 0.56 ± 0.10, P 〈 0.01）. CONCLUSION： The FHIT gene plays an important role in the regulation of apoptosis and decreased FHIT expression plays a key role in the initiation and progression of colorectal carcinoma.
基金supported in part by the National Natural Science Fundation of China(Grant No. 4057016)and Taishan Scholar funding
文摘In this paper, a new transient forced quasi-resonant triad interaction theory in a beta channel is proposed to investigate the interaction between planetary-scale diffluent flow composed of zonal wavenumbers 1-3 and synoptic-scale waves produced continuously by a synoptic-scale vorticity source fixed upstream of an incipient blocking region during the life cycle of blocking. It is shown that the superposition of initial three Rossby waves for zonal wavenumbers 1 （monopole）, 2 （dipole）, and 3 （monopole）, which permit triad quasi-resonance, can represent an incipient blocking event. The synoptic-scale eddies may act to amplify the incipient blocking and to excite a blocking circulation with a strong meander, whose flow pattern depends on the initial amplitudes of the planetary waves and both the intensity and location of preexisting synoptic-scale waves. The onset （decay） of the planetary-scale split-flow blocking is mainly represented by a strong increase （decrease） in the amplitude of the zonal wavenumber 2 component, having a dipole meridional structure related to the preexisting synoptic-scale eddies. The typical persistence time of the model blocking was of about 20 days, consistent with observations of blocking patterns. In our model, isolated asymmetric dipole blocking is formed by synoptic-scale waves. The instantaneous fields of total streamfunctions exhibit a remarkable resemblance to the synoptic maps observed during the life cycle of blocking. During the onset stage, the synoptic-scale waves are enhanced and split into two branches around the blocking region due to the feedback of the amplified blocking, in agreement with the observed changes of synoptic-scale waves in real blocking events. In addition, a diagnostic case study of blocking is presented to confirm the forced quasi-resonant triad interaction theory proposed here.
基金This work was supported by grants from the Major Scientific Project of the Affiliated Hospital of Inner Mongolia Medical University(No.NYFY ZD009)National Natural Science Foundation of China(No.81760676).
文摘In order to demonstrate the relationship between methylation of fragile histidine triad(FHIT)and T-cadherin/H-cadherin(CDH13)genes and liver cancer,the methylation status of FHIT and CDH13 was detected in healthy individuals and in Mongolian and Han patients with liver cancer.The phenol-chloroform method was used to extract genomic DNA.The methylation specific polymerase chain reaction method was applied to detect the methylation status of FHIT and CDH13.The relationship between smoking and alcohol consumption and gene(FHIT and CDH13)methylation was analyzed.There was significant difference in methylation rate of FHIT(72.67%,34.67%)and CDH13(72.0%,28.0%)between liver cancer patients and healthy individuals of Mongolian descent(P<0.05),as well as that of FHIT(68%,30.67%)and CDH13(64%,26%)between liver cancer patients and healthy individuals of Han individuals(P<0.05).There was also a relationship between smoking and drinking and the methylation of FHIT and CDH13(P<0.05).Thus,the methylation of FHIT and CDH13 had a relationship with liver cancer incidence.Smoking and alcohol ingestion may promote the methylation of FHIT and CDH13.
文摘AIM:To evaluate the inhibitory effects of human fragile histidine triad(FHIT) gene on cell proliferation and apoptosis in human hepatocellular carcinoma line Hep3B in vitro. METHODS:A recombinant pcDNA3.1(+) /FHIT including the functional region of FHIT gene was constructed and transferred into human hepatocellular carcinoma cells in vitro. mRNA and protein expression of the FHIT gene in the transfected cells was detected by RT-PCR and Western blot,respectively. The effect of FHIT on proliferation was detected by MTT assay. Changes in cell cycle and apoptosis were assayed by flow cytometry. Five mice received subcutaneous transplantation of Hep3B-FHIT;5 mice received subcutaneous transplantation of normal Hep3B and Hep3B-C as controls. The body weight of nude mice and tumor growth were measured. RESULTS:RT-PCR and Western blot analysis showed that the expression level of FHIT-mRNA and FHIT protein was higher in Hep3B cells after infection withpcDNA3.1(+) /FHIT. The growth of Hep3B cells treated with pcDNA3.1(+) /FHIT was significantly inhibited. The pcDNA3.1(+) /FHIT-transfected Hep3B cells showed a significantly higher cell rate at G0-G1 phase and increased apoptosis in comparison with controls(P < 0.05) . The growth of transplanted tumor was inhibited markedly by FHIT. Tumors arising from the Hep3B-FHIT cells occurred much later than those arising from the Hep3B and Hep3B-C cells. The growth of Hep3B-FHIT cells was slow and the tumor volume was low. CONCLUSION:Transduction of FHIT gene inhibits the growth of human hepatocellular carcinoma cells and induces cell apoptosis in vivo and in vitro.
文摘AIM:To analyze stress fractures in athletes based on experience from our sports medicine clinic.METHODS:We investigated the association between stress fractures and age,sex,sports level,sports activity,and skeletal site in athletes seen at our sports medicine clinic between September 1991 and April 2009.Stress fractures of the pars interarticularis were excluded from this analysis.RESULTS:During this period(18 years and 8 mo),14276 patients(9215 males and 5061 females)consulted our clinic because of sports-related injuries,and 263 patients(1.8%)[171 males(1.9%)and 92 females(1.8%)]sustained stress fractures.The average age of the patients with stress fractures was 20.2 years(range 10-46 years);112 patients(42.6%)were 15-19 years of age and 90(34.2%)were 20-24 years of age.Altogether,90 patients(34.2%)were active at a high recreational level and 173(65.8%)at a competitive level.The highest proportion of stress fractures was seen in basketball athletes(21.3%),followed by baseball(13.7%),track and field(11.4%),rowing(9.5%),soccer(8.4%),aerobics(5.3%),and classical ballet(4.9%).The most common sites of stress fractures in these patients were the tibia(44.1%),followed by the rib(14.1%),metatarsal bone(12.9%),ulnar olecranon(8.7%)and pelvis(8.4%).The sites of the stress fractures varied from sport to sport.The ulnar olecranon was the most common stress fracture site in baseball players,and the rib was the most common in rowers.Basketball and classical ballet athletes predominantly sustained stress fractures of the tibia and metatarsal bone.Track and field and soccer athletes predominantly sustained stress fractures of the tibia and pubic bone.Aerobics athletes predominantly sustained stress fractures of the tibia.Middle and long distance female runners who sustained multiple stress fractures had the female athlete triad.CONCLUSION:The results of this analysis showed that stress fractures were seen in high-level young athletes,with similar proportions for males and females,and that particular sports were associated with specific sites for stress fractures.Middle and long distance female runners who suffered from multiple stress fractures had the female athlete triad.
