Ulcerative colitis(UC)is a chronic and non-specific inflammatory bowel disease(IBD).Huanglian Ganjiang decoction(HGD),derived from ancient book Beiji Qianjin Yao Fang,has demonstrated efficacy in treating UC patients ...Ulcerative colitis(UC)is a chronic and non-specific inflammatory bowel disease(IBD).Huanglian Ganjiang decoction(HGD),derived from ancient book Beiji Qianjin Yao Fang,has demonstrated efficacy in treating UC patients traditionally.Previous research established that the compatibility of cold herb Coptidis Rhizoma+Phellodendri Chinensis Cortex(CP)and hot herb Angelicae Sinensis Radix+Zingiberis Rhizoma(AZ)in HGD synergistically improved colitis mice.This study investigated the compatibility mechanisms through which CP and AZ regulated inflammatory balance in colitis mice.The experimental colitis model was established by administering 3%dextran sulphate sodium(DSS)to mice for 7 days,followed by CP,AZ and CPAZ treatment for an additional 7 days.M1/M2 macrophage polarization levels,glucose metabolites levels and pyruvate dehydrogenase kinase 4(PDK4)expression were analyzed using flow cytometry,Western blot,immunofluorescence and targeted glucose metabolomics.The findings indicated that CP inhibited M1 macrophage polarization,decreased inflammatory metabolites associated with tricarboxylic acid(TCA)cycle,and suppressed PDK4 expression and pyruvate dehydrogenase(PDH)(Ser-293)phosphorylation level.AZ enhanced M2 macrophage polarization,increased lactate axis metabolite lactate levels,and upregulated PDK4 expression and PDH(Ser-293)phosphorylation level.TCA cycle blocker AG-221 and adeno-associated virus(AAV)-PDK4 partially negated CP’s inhibition of M1 macrophage polarization.Lactate axis antagonist oxamate and PDK4 inhibitor dichloroacetate(DCA)partially reduced AZ’s activation of M2 macrophage polarization.In conclusion,the compatibility of CP and AZ synergistically alleviated colitis in mice through M1/M2 macrophage polarization balance via PDK4-mediated glucose metabolism reprogramming.Specifically,CP reduced M1 macrophage polarization by restoration of TCA cycle via PDK4 inhibition,while AZ increased M2 macrophage polarization through activation of PDK4/lactate axis.展开更多
Poly(ADP-ribose)polymerase family member 14(PARP14),which is an intracellular mono(ADP-ribosyl)transferase,has been reported to promote post-stroke functional recovery,but its role in spinal cord injury(SCI)remains un...Poly(ADP-ribose)polymerase family member 14(PARP14),which is an intracellular mono(ADP-ribosyl)transferase,has been reported to promote post-stroke functional recovery,but its role in spinal cord injury(SCI)remains unclear.To investigate this,a T10 spinal cord contusion model was established in C57BL/6 mice,and immediately after the injury PARP14 shRNA-carrying lentivirus was injected 1 mm from the injury site to silence PARP14 expression.We found that PARP14 was up-regulated in the injured spinal cord and that lentivirus-mediated downregulation of PARP14 aggravated functional impairment after injury,accompanied by obvious neuronal apoptosis,severe neuroinflammation,and slight bone loss.Furthermore,PARP14 levels were elevated in microglia after SCI,PARP14 knockdown activated microglia in the spinal cord and promoted a shift from M2-polarized microglia(anti-inflammatory phenotype)to M1-polarized microglia(pro-inflammatory phenotype)that may have been mediated by the signal transducers and activators of transcription(STAT)1/6 pathway.Next,microglia M1 and M2 polarization were induced in vitro using lipopolysaccharide/interferon-γand interleukin-4,respectively.The results showed that PARP14 knockdown promoted microglia M1 polarization,accompanied by activation of the STAT1 pathway.In addition,PARP14 overexpression made microglia more prone to M2 polarization and further activated the STAT6 pathway.In conclusion,these findings suggest that PARP14 may improve functional recovery after SCI by regulating the phenotypic transformation of microglia via the STAT1/6 pathway.展开更多
Microglial cells are important resident innate immune components in the central nervous system that are often activated during neuroinflammation.Activated microglia can display one of two phenotypes,M1 or M2,which eac...Microglial cells are important resident innate immune components in the central nervous system that are often activated during neuroinflammation.Activated microglia can display one of two phenotypes,M1 or M2,which each play distinct roles in neuroinflammation.Rutin,a dietary flavonoid,exhibits protective effects against neuroinflammation.However,whether rutin is able to influence the M1/M2 polarization of microglia remains unclear.In this study,in vitro BV-2 cell models of neuroinflammation were established using 100 ng/mL lipopolysaccharide to investigate the effects of 1-hour rutin pretreatment on microglial polarization.The results revealed that rutin pretreatment reduced the expression of the proinflammatory cytokines tumor necrosis factor-α,interleukin-1β,and interleukin-6 and increased the secretion of interleukin-10.Rutin pretreatment also downregulated the expression of the M1 microglial markers CD86 and inducible nitric oxide synthase and upregulated the expression of the M2 microglial markers arginase 1 and CD206.Rutin pretreatment inhibited the expression of Toll-like receptor 4 and myeloid differentiation factor 88 and blocked the phosphorylation of I kappa B kinase and nuclear factor-kappa B.These results showed that rutin pretreatment may promote the phenotypic switch of microglia M1 to M2 by inhibiting the Toll-like receptor 4/nuclear factor-kappa B signaling pathway to alleviate lipopolysaccharide-induced neuroinflammation.展开更多
After spinal cord injury(SCI),astrocytes gradually migrate to and surround the lesion,depositing chondroitin sulfate proteoglycan-rich extracellular matrix and forming astrocytic scar,which limits the spread of inflam...After spinal cord injury(SCI),astrocytes gradually migrate to and surround the lesion,depositing chondroitin sulfate proteoglycan-rich extracellular matrix and forming astrocytic scar,which limits the spread of inflammation but hinders axon regeneration.Meanwhile,microglia gradually accumulate at the lesion border to form microglial scar and can polarize to generate a pro-inflammatory M1 phenotype or an anti-inflammatory M2 phenotype.However,the effect of microglia polarization on astrocytes is unclear.Here,we found that both microglia(CX3 CR1^(+))and astrocytes(GFAP^(+))gathered at the lesion border at 14 days post-injury(dpi).The microglia accumulated along the inner border of and in direct contact with the astrocytes.M1-type microglia(i NOS^(+)CX3 CR1^(+))were primarily observed at 3 and 7 dpi,while M2-type microglia(Arg1^(+)CX3 CR1^(+))were present at larger numbers at 7 and 14 dpi.Transforming growth factor-β1(TGFβ1)was highly expressed in M1 microglia in vitro,consistent with strong expression of TGFβ1 by microglia in vivo at 3 and 7 dpi,when they primarily exhibited an M1 phenotype.Furthermore,conditioned media from M1-type microglia induced astrocytes to secrete chondroitin sulfate proteoglycan in vitro.This effect was eliminated by knocking down sex-determining region Y-box 9(SOX9)in astrocytes and could not be reversed by treatment with TGFβ1.Taken together,our results suggest that microglia undergo M1 polarization and express high levels of TGFβ1 at 3 and 7 dpi,and that M1-type microglia induce astrocytes to deposit chondroitin sulfate proteoglycan via the TGFβ1/SOX9 pathway.The study was approved by the Institutional Animal Care and Use Committee of Anhui Medical University,China(approval No.LLSC20160052)on March 1,2016.展开更多
Immunotherapy with interleukin-2(IL-2)in treating cancers is subject to several limitations such as systemic side effects and reduced efficacy against tumors with low immune cell infiltration despite its promise.To ad...Immunotherapy with interleukin-2(IL-2)in treating cancers is subject to several limitations such as systemic side effects and reduced efficacy against tumors with low immune cell infiltration despite its promise.To address these challenges,IL-2-So-Lipo,a novel liposomal formulation combining IL-2 with sorafenib derivative,was developed as an anti-angiogenic drug that inhibits the growth of new blood vessels which play crucial roles in tumor growth.Sorafenib derivatives could target at melanoma-specific receptors,further enhancing liposomal specificity at the tumor site.Our results demonstrated that the prepared IL-2-So-Lipo significantly enhanced anti-tumor activity compared to IL-2 or sorafenib monotherapies,as well as their combination.In a B16F10 melanoma model,IL-2-So-Lipo was found to significantly inhibit tumor progression(tumor volume of 108.01±62.99 mm^(3))compared to the control group(tumor volume of 1,397.13±75.55 mm^(3)),improving the therapeutic efficacy.This enhanced efficacy is attributed to the targeted delivery of IL-2 which promoted the infiltration and activation of cytotoxic T lymphocytes.Additionally,liposomal encapsulation of sorafenib derivatives enhanced its delivery efficiency,promoting tumor cell apoptosis and suppressing angiogenesis.Mechanistically,IL-2-So-Lipo could kill tumors by inducing a shift towards an anti-tumor immune response via facilitating the polarization of macrophages towards the M1 phenotype.Furthermore,IL-2-So-Lipo downregulated several key proteins in the MAPK signaling pathway,exerting a significant role in mediating tumor resistance to sorafenib.These findings underscore the potential of IL-2-So-Lipo as a promising strategy to improve the therapeutic efficacy of immunotherapy and targeted therapy in cancers.Moreover,the combination of IL-2 and sorafenib in a liposomal delivery system overcame the limitations of conventional IL-2 therapy,offering a synergistic approach to improve therapeutic outcomes for solid tumors.展开更多
Pathologic inflammatory conditions are frequently correlated with dynamic alterations through macrophage activation,with classically activated Ml cells associated with promoting and sustaining inflammation and M2 cell...Pathologic inflammatory conditions are frequently correlated with dynamic alterations through macrophage activation,with classically activated Ml cells associated with promoting and sustaining inflammation and M2 cells implicated in resolving or smoldering chronic inflammation.Inflammation is a common feature of various chronic diseases,and it has direct involvement in the emergence and progression of these conditions.Macrophages participate in an autoregulatory loop characterizing inflammatory process,as they produce a wide range of biologically active mediators that exert either deleterious or beneficial effects during inflammation.Therefore,balancing the ratio of M1/M2 macrophages can help to ameliorate the inflammatory landscape of pathological conditions.This review will explore the role of macrophage polarization in distant pathological inflammatory conditions,such as cancer,autoimmunity,renal inflammation,stroke,and atherosclerosis,while sharing macrophage-driven pathogenesis.展开更多
Pulmonary fibrosis is a devastating lung disease without effective treatment options. Sphingosine-1-phosphate receptor 3 (S1pr3), a receptor for the lipid signaling moleculesphingosine-1-phosphate, has been shown to m...Pulmonary fibrosis is a devastating lung disease without effective treatment options. Sphingosine-1-phosphate receptor 3 (S1pr3), a receptor for the lipid signaling moleculesphingosine-1-phosphate, has been shown to mediate the development of pulmonary fibrosis,although the underlying mechanism is not fully understood. Here, we found increased expression of S1pr3 in the lung during the process of bleomycin-induced pulmonary fibrosis in miceand specific overexpression of S1pr3 in the infiltrated M2 macrophages. We constructed LysM-Cre^(+)/S1pr3^(flox/flox) mice, in which S1pr3 was conditionally depleted in myeloid cells, andthis depletion protected mice from bleomycin-induced lung injury and fibrosis, with reducedM2 macrophage accumulation in the lung. Increased S1pr3 expression was found in bonemarrow-derived macrophages after alternatively activated by IL4 ex vivo, while loss ofS1pr3 attenuated IL-4-induced M2 polarization in bone marrow-derived macrophages by repressing the PI3K/Akt-Stat3 signaling pathway. Moreover, the S1pr3 inhibitors CAY10444 andTY52156 exerted protective effects on pulmonary fibrosis in mice. Taken together, ourresearch showed that inhibition of S1pr3 ameliorates bleomycin-induced pulmonary fibrosisby reducing macrophage M2 polarization via the PI3K/Akt-Stat3 signaling pathway, indicatingthat S1pr3 may be a potential target for pulmonary fibrosis treatment.展开更多
Germinal matrix hemorrhage is one of the leading causes of morbidity,mortality,and acquired infantile hydrocephalus in preterm infants in the United States,with little progress made in its clinical management.Blood cl...Germinal matrix hemorrhage is one of the leading causes of morbidity,mortality,and acquired infantile hydrocephalus in preterm infants in the United States,with little progress made in its clinical management.Blood clots have been shown to elicit secondary brain injury after germinal matrix hemorrhage,by disrupting normal cerebrospinal fluid circulation and absorption after germinal matrix hemorrhage causing post-hemorrhagic hydrocephalus development.Current evidence suggests that rapid hematoma resolution is necessary to improve neurological outcomes after hemorrhagic stroke.Various articles have demonstrated the beneficial effects of stimulating the polarization of microglia cells into the M2 phenotype,as it has been suggested that they play an essential role in the rapid phagocytosis of the blood clot after hemorrhagic models of stroke.N-formyl peptide receptor 2(FPR2),a G-protein-coupled receptor,has been shown to be neuroprotective after stroke.FPR2 activation has been associated with the upregulation of phagocytic macrophage clearance,yet its mechanism has not been fully explored.Recent literature suggests that FPR2 may play a role in the stimulation of scavenger receptor CD36.Scavenger receptor CD36 plays a vital role in microglia phagocytic blood clot clearance after germinal matrix hemorrhage.FPR2 has been shown to phosphorylate extracellular-signal-regulated kinase 1/2(ERK1/2),which then promotes the transcription of the dual-specificity protein phosphatase 1(DUSP1)gene.In this review,we present an intrinsic outline of the main components involved in FPR2 stimulation and hematoma resolution after germinal matrix hemorrhage.展开更多
TMEM16F is involved in many physiological processes such as blood coagulation,cell membrane fusion and bone mineralization.Activation of TMEM16F has been studied in various central nervous system diseases.High TMEM16F...TMEM16F is involved in many physiological processes such as blood coagulation,cell membrane fusion and bone mineralization.Activation of TMEM16F has been studied in various central nervous system diseases.High TMEM16F level has been also found to participate in microglial phagocytosis and transformation.Microglia-mediated neuroinflammation is a key factor in promoting the progression of Alzheimer’s disease.However,few studies have examined the effects of TMEM16F on neuroinflammation in Alzheimer’s disease.In this study,we established TMEM16F-knockdown AD model in vitro and in vivo to investigate the underlying regulatory mechanism about TMEM16F-mediated neuroinflammation in AD.We performed a Morris water maze test to evaluate the spatial memory ability of animals and detected markers for the microglia M1/M2 phenotype and NLRP3 inflammasome.Our results showed that TMEM16F was elevated in 9-month-old APP/PS1 mice.After TMEM16F knockdown in mice,spatial memory ability was improved,microglia polarization to the M2 phenotype was promoted,NLRP3 inflammasome activation was inhibited,cell apoptosis and Aβplaque deposition in brain tissue were reduced,and brain injury was alleviated.We used amyloid-beta(Aβ_(25-35))to stimulate human microglia to construct microglia models of Alzheimer’s disease.The levels of TMEM16F,inducible nitric oxide synthase(iNOS),proinflammatory cytokines and NLRP3 inflammasome-associated biomarkers were higher in Aβ_(25-35) treated group compared with that in the control group.TMEM16F knockdown enhanced the expression of the M2 phenotype biomarkers Arg1 and Socs3,reduced the release of proinflammatory factors interleukin-1,interleukin-6 and tumor necrosis factor-α,and inhibited NLRP3 inflammasome activation through reducing downstream proinflammatory factors interleukin-1βand interleukin-18.This inhibitory effect of TMEM16F knockdown on M1 microglia was partially reversed by the NLRP3 agonist Nigericin.Our findings suggest that TMEM16F participates in neuroinflammation in Alzheimer’s disease through participating in polarization of microglia and activation of the NLRP3 inflammasome.These results indicate that TMEM16F inhibition may be a potential therapeutic approach for Alzheimer’s disease treatment.展开更多
Stimulator of interferon genes(STING) is a cytosolic DNA sensor which is regarded as a potential target for antitumor immunotherapy. However, clinical trials of STING agonists display limited anti-tumor effects and do...Stimulator of interferon genes(STING) is a cytosolic DNA sensor which is regarded as a potential target for antitumor immunotherapy. However, clinical trials of STING agonists display limited anti-tumor effects and dose-dependent side-effects like inflammatory damage and cell toxicity. Here,we showed that tetrahedral DNA nanostructures(TDNs) actively enter macrophages to promote STING activation and M1 polarization in a size-dependent manner, and synergized with Mn^(2+) to enhance the expressions of IFN-β and iNOS, as well as the co-stimulatory molecules for antigen presentation. Moreover, to reduce the cytotoxicity of Mn^(2+),we constructed a TDN-MnO_(2) complex and found that it displayed a much higher efficacy than TDN plus Mn^(2+) to initiate macrophage activation and anti-tumor response both in vitro and in vivo. Together, our studies explored a novel immune activation effect of TDN in cancer therapy and its synergistic therapeutic outcomes with MnO_(2).These findings provide new therapeutic opportunities for cancer therapy.展开更多
Interleukin-4 plays an important protective role in Alzheimer’s disease by regulating microglial phenotype,phagocytosis of amyloid-β,and secretion of anti-inflammatory and neurotrophic cytokines.Recently,increasing ...Interleukin-4 plays an important protective role in Alzheimer’s disease by regulating microglial phenotype,phagocytosis of amyloid-β,and secretion of anti-inflammatory and neurotrophic cytokines.Recently,increasing evidence has suggested that autophagy regulates innate immunity by affecting M1/M2 polarization of microglia/macrophages.However,the role of interleukin-4 in microglial autophagy is unknown.In view of this,BV2 microglia were treated with 0,10,20 or 50 ng/mL interleukin-4 for 24,48,or 72 hours.Subsequently,light chain 3-II and p62 protein expression levels were detected by western blot assay.BV2 microglia were incubated with interleukin-4(20 ng/mL,experimental group),3-methyladenine(500μM,autophagy inhibitor,negative control group),rapamycin(100 nM,autophagy inductor,positive control group),3-methyladenine+interleukin-4(rescue group),or without treatment for 24 hours,and then exposed to amyloid-β(1μM,model group)or vehicle control(control)for 24 hours.LC3-II and p62 protein expression levels were again detected by western blot assay.In addition,expression levels of multiple markers of M1 and M2 phenotype were assessed by real-time fluorescence quantitative polymerase chain reaction,while intracellular and supernatant amyloid-βprotein levels were measured by enzyme-linked immunosorbent assay.Our results showed that interleukin-4 induced microglial autophagic flux,most significantly at 20 ng/mL for 48 hours.Interleukin-4 pretreated microglia inhibited blockade of amyloid-β-induced autophagic flux,and promoted amyloid-βuptake and degradation partly through autophagic flux,but inhibited switching of amyloid-β-induced M1 phenotype independent on autophagic flux.These results indicate that interleukin-4 pretreated microglia increases uptake and degradation of amyloid-βin a process partly mediated by autophagy,which may play a protective role against Alzheimer’s disease.展开更多
Objective To investigate and reveal the underlying mechanism of the effect of total saponins from Dioscoreae nipponica Makino(TSDN)on the arachidonic acid pathway in monosodium urate(MSU)crystal-induced M1-polarized m...Objective To investigate and reveal the underlying mechanism of the effect of total saponins from Dioscoreae nipponica Makino(TSDN)on the arachidonic acid pathway in monosodium urate(MSU)crystal-induced M1-polarized macrophages.Methods M1 polarization of RAW264.7 cells were induced by 1µg/mL lipopolysaccharide(LPS).The methylthiazolyldiphenyl-tetrazolium bromide method was then used to screen the concentration of TSDN.MSU(500µg/mL)was used to induce the gouty arthritis model.Afterwards,10µg/L TSDN and 8µmol/L celecoxib,which was used as a positive control,were added to the above LPS and MSU-induced cells for 24 h.The mRNA and protein expressions of cyclooxygenase(COX)2,5-lipoxygenase(5-LOX),microsomal prostaglandin E synthase derived eicosanoids(mPGES)-1,leukotriene B(LTB)4,cytochrome P450(CYP)4A,and prostaglandin E_(2)(PGE_(2))were tested by real-time polymerase chain reaction and Western blotting,respectively.The enzyme-linked immunosorbent assay was used to test the contents of M1 markers,including inducible nitric oxid synthase(NOS)2,CD80,and CD86.Results TSDN inhibited the proliferation of M1 macrophages and decreased both the mRNA and protein expressions of COX2,5-LOX,CYP4A,LTB4,and PGE_(2)(P<0.01)while increased the mRNA and protein expression of mPGES-1(P<0.05 or P<0.01).TSDN could also significantly decrease the contents of NOS2,CD80,and CD86(P<0.01).Conclusion TSDN has an anti-inflammation effect on gouty arthritis in an in vitro model by regulating arachidonic acid signaling pathway.展开更多
Osteoarthritis(OA),in which M1 macrophage polarization in the synovium exacerbates disease progression,is a major cause of cartilage degeneration and functional disabilities.Therapeutic strategies of OA designed to in...Osteoarthritis(OA),in which M1 macrophage polarization in the synovium exacerbates disease progression,is a major cause of cartilage degeneration and functional disabilities.Therapeutic strategies of OA designed to interfere with the polarization of macrophages have rarely been reported.Here,we report that SHP099,as an allosteric inhibitor of src-homology 2-containing protein tyrosine phosphatase 2(SHP2),attenuated osteoarthritis progression by inhibiting M1 macrophage polarization.We demonstrated that M1 macrophage polarization was accompanied by the overexpression of SHP2 in the synovial tissues of OA patients and OA model mice.Compared to wild-type(WT)mice,myeloid lineage conditional Shp2 knockout(c KO)mice showed decreased M1 macrophage polarization and attenuated severity of synovitis,an elevated expression of cartilage phenotype protein collagen II(COL2),and a decreased expression of cartilage degradation markers collagen X(COL10)and matrix metalloproteinase3(MMP3)in OA cartilage.Further mechanistic analysis showed that SHP099 inhibited lipopolysaccharide(LPS)-induced Toll-like receptor(TLR)signaling mediated by nuclear factor kappa B(NF-κB)and PI3K—AKT signaling.Moreover,intra-articular injection of SHP099 also significantly attenuated OA progression,including joint synovitis and cartilage damage.These results indicated that allosteric inhibition of SHP2 might be a promising therapeutic strategy for the treatment of OA.展开更多
基金supported by the National Natural Science Foundation of China(Nos.82374325 and 82074322)GDAS'ProjectofScience and Technology Development(No.2022GDASZH-2022010110).
文摘Ulcerative colitis(UC)is a chronic and non-specific inflammatory bowel disease(IBD).Huanglian Ganjiang decoction(HGD),derived from ancient book Beiji Qianjin Yao Fang,has demonstrated efficacy in treating UC patients traditionally.Previous research established that the compatibility of cold herb Coptidis Rhizoma+Phellodendri Chinensis Cortex(CP)and hot herb Angelicae Sinensis Radix+Zingiberis Rhizoma(AZ)in HGD synergistically improved colitis mice.This study investigated the compatibility mechanisms through which CP and AZ regulated inflammatory balance in colitis mice.The experimental colitis model was established by administering 3%dextran sulphate sodium(DSS)to mice for 7 days,followed by CP,AZ and CPAZ treatment for an additional 7 days.M1/M2 macrophage polarization levels,glucose metabolites levels and pyruvate dehydrogenase kinase 4(PDK4)expression were analyzed using flow cytometry,Western blot,immunofluorescence and targeted glucose metabolomics.The findings indicated that CP inhibited M1 macrophage polarization,decreased inflammatory metabolites associated with tricarboxylic acid(TCA)cycle,and suppressed PDK4 expression and pyruvate dehydrogenase(PDH)(Ser-293)phosphorylation level.AZ enhanced M2 macrophage polarization,increased lactate axis metabolite lactate levels,and upregulated PDK4 expression and PDH(Ser-293)phosphorylation level.TCA cycle blocker AG-221 and adeno-associated virus(AAV)-PDK4 partially negated CP’s inhibition of M1 macrophage polarization.Lactate axis antagonist oxamate and PDK4 inhibitor dichloroacetate(DCA)partially reduced AZ’s activation of M2 macrophage polarization.In conclusion,the compatibility of CP and AZ synergistically alleviated colitis in mice through M1/M2 macrophage polarization balance via PDK4-mediated glucose metabolism reprogramming.Specifically,CP reduced M1 macrophage polarization by restoration of TCA cycle via PDK4 inhibition,while AZ increased M2 macrophage polarization through activation of PDK4/lactate axis.
基金supported by the Shenyang Science and Technology Project,No.20-205-4-092(to AHX)。
文摘Poly(ADP-ribose)polymerase family member 14(PARP14),which is an intracellular mono(ADP-ribosyl)transferase,has been reported to promote post-stroke functional recovery,but its role in spinal cord injury(SCI)remains unclear.To investigate this,a T10 spinal cord contusion model was established in C57BL/6 mice,and immediately after the injury PARP14 shRNA-carrying lentivirus was injected 1 mm from the injury site to silence PARP14 expression.We found that PARP14 was up-regulated in the injured spinal cord and that lentivirus-mediated downregulation of PARP14 aggravated functional impairment after injury,accompanied by obvious neuronal apoptosis,severe neuroinflammation,and slight bone loss.Furthermore,PARP14 levels were elevated in microglia after SCI,PARP14 knockdown activated microglia in the spinal cord and promoted a shift from M2-polarized microglia(anti-inflammatory phenotype)to M1-polarized microglia(pro-inflammatory phenotype)that may have been mediated by the signal transducers and activators of transcription(STAT)1/6 pathway.Next,microglia M1 and M2 polarization were induced in vitro using lipopolysaccharide/interferon-γand interleukin-4,respectively.The results showed that PARP14 knockdown promoted microglia M1 polarization,accompanied by activation of the STAT1 pathway.In addition,PARP14 overexpression made microglia more prone to M2 polarization and further activated the STAT6 pathway.In conclusion,these findings suggest that PARP14 may improve functional recovery after SCI by regulating the phenotypic transformation of microglia via the STAT1/6 pathway.
基金This study was supported by the Natural Science and Technology Foundation of Zunyi City,China,No.201915(to GPL)Doctor Startup Foundation of Zunyi Medical University,Nos.[2017]5733-045(to GPL),[2017]5733-044(to YYH)Natural Science and Technology Foundation of Guizhou Province,China,No.[2020]1Y292(to YYH).
文摘Microglial cells are important resident innate immune components in the central nervous system that are often activated during neuroinflammation.Activated microglia can display one of two phenotypes,M1 or M2,which each play distinct roles in neuroinflammation.Rutin,a dietary flavonoid,exhibits protective effects against neuroinflammation.However,whether rutin is able to influence the M1/M2 polarization of microglia remains unclear.In this study,in vitro BV-2 cell models of neuroinflammation were established using 100 ng/mL lipopolysaccharide to investigate the effects of 1-hour rutin pretreatment on microglial polarization.The results revealed that rutin pretreatment reduced the expression of the proinflammatory cytokines tumor necrosis factor-α,interleukin-1β,and interleukin-6 and increased the secretion of interleukin-10.Rutin pretreatment also downregulated the expression of the M1 microglial markers CD86 and inducible nitric oxide synthase and upregulated the expression of the M2 microglial markers arginase 1 and CD206.Rutin pretreatment inhibited the expression of Toll-like receptor 4 and myeloid differentiation factor 88 and blocked the phosphorylation of I kappa B kinase and nuclear factor-kappa B.These results showed that rutin pretreatment may promote the phenotypic switch of microglia M1 to M2 by inhibiting the Toll-like receptor 4/nuclear factor-kappa B signaling pathway to alleviate lipopolysaccharide-induced neuroinflammation.
基金supported by the National Natural Science Foundation of China,Nos.81801220(to MGZ),81671204(to JHJ)Key Research and Development Projects of Anhui Province of China,No.202004j07020042(to JHJ)。
文摘After spinal cord injury(SCI),astrocytes gradually migrate to and surround the lesion,depositing chondroitin sulfate proteoglycan-rich extracellular matrix and forming astrocytic scar,which limits the spread of inflammation but hinders axon regeneration.Meanwhile,microglia gradually accumulate at the lesion border to form microglial scar and can polarize to generate a pro-inflammatory M1 phenotype or an anti-inflammatory M2 phenotype.However,the effect of microglia polarization on astrocytes is unclear.Here,we found that both microglia(CX3 CR1^(+))and astrocytes(GFAP^(+))gathered at the lesion border at 14 days post-injury(dpi).The microglia accumulated along the inner border of and in direct contact with the astrocytes.M1-type microglia(i NOS^(+)CX3 CR1^(+))were primarily observed at 3 and 7 dpi,while M2-type microglia(Arg1^(+)CX3 CR1^(+))were present at larger numbers at 7 and 14 dpi.Transforming growth factor-β1(TGFβ1)was highly expressed in M1 microglia in vitro,consistent with strong expression of TGFβ1 by microglia in vivo at 3 and 7 dpi,when they primarily exhibited an M1 phenotype.Furthermore,conditioned media from M1-type microglia induced astrocytes to secrete chondroitin sulfate proteoglycan in vitro.This effect was eliminated by knocking down sex-determining region Y-box 9(SOX9)in astrocytes and could not be reversed by treatment with TGFβ1.Taken together,our results suggest that microglia undergo M1 polarization and express high levels of TGFβ1 at 3 and 7 dpi,and that M1-type microglia induce astrocytes to deposit chondroitin sulfate proteoglycan via the TGFβ1/SOX9 pathway.The study was approved by the Institutional Animal Care and Use Committee of Anhui Medical University,China(approval No.LLSC20160052)on March 1,2016.
基金supported by the Macao Science and Technology Development Fund (FDCT 0148/2022/A3 and 0019/2024/RIA1)the National Natural Science Foundation of China (No. 81572979)
文摘Immunotherapy with interleukin-2(IL-2)in treating cancers is subject to several limitations such as systemic side effects and reduced efficacy against tumors with low immune cell infiltration despite its promise.To address these challenges,IL-2-So-Lipo,a novel liposomal formulation combining IL-2 with sorafenib derivative,was developed as an anti-angiogenic drug that inhibits the growth of new blood vessels which play crucial roles in tumor growth.Sorafenib derivatives could target at melanoma-specific receptors,further enhancing liposomal specificity at the tumor site.Our results demonstrated that the prepared IL-2-So-Lipo significantly enhanced anti-tumor activity compared to IL-2 or sorafenib monotherapies,as well as their combination.In a B16F10 melanoma model,IL-2-So-Lipo was found to significantly inhibit tumor progression(tumor volume of 108.01±62.99 mm^(3))compared to the control group(tumor volume of 1,397.13±75.55 mm^(3)),improving the therapeutic efficacy.This enhanced efficacy is attributed to the targeted delivery of IL-2 which promoted the infiltration and activation of cytotoxic T lymphocytes.Additionally,liposomal encapsulation of sorafenib derivatives enhanced its delivery efficiency,promoting tumor cell apoptosis and suppressing angiogenesis.Mechanistically,IL-2-So-Lipo could kill tumors by inducing a shift towards an anti-tumor immune response via facilitating the polarization of macrophages towards the M1 phenotype.Furthermore,IL-2-So-Lipo downregulated several key proteins in the MAPK signaling pathway,exerting a significant role in mediating tumor resistance to sorafenib.These findings underscore the potential of IL-2-So-Lipo as a promising strategy to improve the therapeutic efficacy of immunotherapy and targeted therapy in cancers.Moreover,the combination of IL-2 and sorafenib in a liposomal delivery system overcame the limitations of conventional IL-2 therapy,offering a synergistic approach to improve therapeutic outcomes for solid tumors.
文摘Pathologic inflammatory conditions are frequently correlated with dynamic alterations through macrophage activation,with classically activated Ml cells associated with promoting and sustaining inflammation and M2 cells implicated in resolving or smoldering chronic inflammation.Inflammation is a common feature of various chronic diseases,and it has direct involvement in the emergence and progression of these conditions.Macrophages participate in an autoregulatory loop characterizing inflammatory process,as they produce a wide range of biologically active mediators that exert either deleterious or beneficial effects during inflammation.Therefore,balancing the ratio of M1/M2 macrophages can help to ameliorate the inflammatory landscape of pathological conditions.This review will explore the role of macrophage polarization in distant pathological inflammatory conditions,such as cancer,autoimmunity,renal inflammation,stroke,and atherosclerosis,while sharing macrophage-driven pathogenesis.
基金supported by the General Basic Research Project from the Ministry of Education Key Laboratory of Child Development and Disorders(China)(No.GBRP202115)the Chongqing Science and Technology Bureau Major Project(China)(No.cstc2020jcyj-msxmX0782).
文摘Pulmonary fibrosis is a devastating lung disease without effective treatment options. Sphingosine-1-phosphate receptor 3 (S1pr3), a receptor for the lipid signaling moleculesphingosine-1-phosphate, has been shown to mediate the development of pulmonary fibrosis,although the underlying mechanism is not fully understood. Here, we found increased expression of S1pr3 in the lung during the process of bleomycin-induced pulmonary fibrosis in miceand specific overexpression of S1pr3 in the infiltrated M2 macrophages. We constructed LysM-Cre^(+)/S1pr3^(flox/flox) mice, in which S1pr3 was conditionally depleted in myeloid cells, andthis depletion protected mice from bleomycin-induced lung injury and fibrosis, with reducedM2 macrophage accumulation in the lung. Increased S1pr3 expression was found in bonemarrow-derived macrophages after alternatively activated by IL4 ex vivo, while loss ofS1pr3 attenuated IL-4-induced M2 polarization in bone marrow-derived macrophages by repressing the PI3K/Akt-Stat3 signaling pathway. Moreover, the S1pr3 inhibitors CAY10444 andTY52156 exerted protective effects on pulmonary fibrosis in mice. Taken together, ourresearch showed that inhibition of S1pr3 ameliorates bleomycin-induced pulmonary fibrosisby reducing macrophage M2 polarization via the PI3K/Akt-Stat3 signaling pathway, indicatingthat S1pr3 may be a potential target for pulmonary fibrosis treatment.
基金supported in part by the National Institutes of Health grant 5R01NS117364-02(to JT)。
文摘Germinal matrix hemorrhage is one of the leading causes of morbidity,mortality,and acquired infantile hydrocephalus in preterm infants in the United States,with little progress made in its clinical management.Blood clots have been shown to elicit secondary brain injury after germinal matrix hemorrhage,by disrupting normal cerebrospinal fluid circulation and absorption after germinal matrix hemorrhage causing post-hemorrhagic hydrocephalus development.Current evidence suggests that rapid hematoma resolution is necessary to improve neurological outcomes after hemorrhagic stroke.Various articles have demonstrated the beneficial effects of stimulating the polarization of microglia cells into the M2 phenotype,as it has been suggested that they play an essential role in the rapid phagocytosis of the blood clot after hemorrhagic models of stroke.N-formyl peptide receptor 2(FPR2),a G-protein-coupled receptor,has been shown to be neuroprotective after stroke.FPR2 activation has been associated with the upregulation of phagocytic macrophage clearance,yet its mechanism has not been fully explored.Recent literature suggests that FPR2 may play a role in the stimulation of scavenger receptor CD36.Scavenger receptor CD36 plays a vital role in microglia phagocytic blood clot clearance after germinal matrix hemorrhage.FPR2 has been shown to phosphorylate extracellular-signal-regulated kinase 1/2(ERK1/2),which then promotes the transcription of the dual-specificity protein phosphatase 1(DUSP1)gene.In this review,we present an intrinsic outline of the main components involved in FPR2 stimulation and hematoma resolution after germinal matrix hemorrhage.
基金supported by the National Natural Science Foundation of China,No.82072941(to QHX)Liaoning Province Key R&D Program Guidance Project,No.2020JH2/10300044Science and Technology Plan Project of Shenyang,No.20-205-4-050(both to XHS)。
文摘TMEM16F is involved in many physiological processes such as blood coagulation,cell membrane fusion and bone mineralization.Activation of TMEM16F has been studied in various central nervous system diseases.High TMEM16F level has been also found to participate in microglial phagocytosis and transformation.Microglia-mediated neuroinflammation is a key factor in promoting the progression of Alzheimer’s disease.However,few studies have examined the effects of TMEM16F on neuroinflammation in Alzheimer’s disease.In this study,we established TMEM16F-knockdown AD model in vitro and in vivo to investigate the underlying regulatory mechanism about TMEM16F-mediated neuroinflammation in AD.We performed a Morris water maze test to evaluate the spatial memory ability of animals and detected markers for the microglia M1/M2 phenotype and NLRP3 inflammasome.Our results showed that TMEM16F was elevated in 9-month-old APP/PS1 mice.After TMEM16F knockdown in mice,spatial memory ability was improved,microglia polarization to the M2 phenotype was promoted,NLRP3 inflammasome activation was inhibited,cell apoptosis and Aβplaque deposition in brain tissue were reduced,and brain injury was alleviated.We used amyloid-beta(Aβ_(25-35))to stimulate human microglia to construct microglia models of Alzheimer’s disease.The levels of TMEM16F,inducible nitric oxide synthase(iNOS),proinflammatory cytokines and NLRP3 inflammasome-associated biomarkers were higher in Aβ_(25-35) treated group compared with that in the control group.TMEM16F knockdown enhanced the expression of the M2 phenotype biomarkers Arg1 and Socs3,reduced the release of proinflammatory factors interleukin-1,interleukin-6 and tumor necrosis factor-α,and inhibited NLRP3 inflammasome activation through reducing downstream proinflammatory factors interleukin-1βand interleukin-18.This inhibitory effect of TMEM16F knockdown on M1 microglia was partially reversed by the NLRP3 agonist Nigericin.Our findings suggest that TMEM16F participates in neuroinflammation in Alzheimer’s disease through participating in polarization of microglia and activation of the NLRP3 inflammasome.These results indicate that TMEM16F inhibition may be a potential therapeutic approach for Alzheimer’s disease treatment.
基金supported by grants:National Natural Science Foundation of China (82072087,31670880 and 31970893,China)Guangdong Natural Science Fund for Distinguished Young Scholars (2017A030306016 and 2016A030306004,China)+1 种基金the Fundamental Research Funds for the Central Universities (19ykzd39,China)Open project of Guangdong Key Laboratory of Chiral Molecule and Drug Discovery (Sun Yat-sen University,China)。
文摘Stimulator of interferon genes(STING) is a cytosolic DNA sensor which is regarded as a potential target for antitumor immunotherapy. However, clinical trials of STING agonists display limited anti-tumor effects and dose-dependent side-effects like inflammatory damage and cell toxicity. Here,we showed that tetrahedral DNA nanostructures(TDNs) actively enter macrophages to promote STING activation and M1 polarization in a size-dependent manner, and synergized with Mn^(2+) to enhance the expressions of IFN-β and iNOS, as well as the co-stimulatory molecules for antigen presentation. Moreover, to reduce the cytotoxicity of Mn^(2+),we constructed a TDN-MnO_(2) complex and found that it displayed a much higher efficacy than TDN plus Mn^(2+) to initiate macrophage activation and anti-tumor response both in vitro and in vivo. Together, our studies explored a novel immune activation effect of TDN in cancer therapy and its synergistic therapeutic outcomes with MnO_(2).These findings provide new therapeutic opportunities for cancer therapy.
基金supported by the Natural Science Foundation of Liaoning Province of China,No.20170541036(to HYL)
文摘Interleukin-4 plays an important protective role in Alzheimer’s disease by regulating microglial phenotype,phagocytosis of amyloid-β,and secretion of anti-inflammatory and neurotrophic cytokines.Recently,increasing evidence has suggested that autophagy regulates innate immunity by affecting M1/M2 polarization of microglia/macrophages.However,the role of interleukin-4 in microglial autophagy is unknown.In view of this,BV2 microglia were treated with 0,10,20 or 50 ng/mL interleukin-4 for 24,48,or 72 hours.Subsequently,light chain 3-II and p62 protein expression levels were detected by western blot assay.BV2 microglia were incubated with interleukin-4(20 ng/mL,experimental group),3-methyladenine(500μM,autophagy inhibitor,negative control group),rapamycin(100 nM,autophagy inductor,positive control group),3-methyladenine+interleukin-4(rescue group),or without treatment for 24 hours,and then exposed to amyloid-β(1μM,model group)or vehicle control(control)for 24 hours.LC3-II and p62 protein expression levels were again detected by western blot assay.In addition,expression levels of multiple markers of M1 and M2 phenotype were assessed by real-time fluorescence quantitative polymerase chain reaction,while intracellular and supernatant amyloid-βprotein levels were measured by enzyme-linked immunosorbent assay.Our results showed that interleukin-4 induced microglial autophagic flux,most significantly at 20 ng/mL for 48 hours.Interleukin-4 pretreated microglia inhibited blockade of amyloid-β-induced autophagic flux,and promoted amyloid-βuptake and degradation partly through autophagic flux,but inhibited switching of amyloid-β-induced M1 phenotype independent on autophagic flux.These results indicate that interleukin-4 pretreated microglia increases uptake and degradation of amyloid-βin a process partly mediated by autophagy,which may play a protective role against Alzheimer’s disease.
基金Supported by Joint Guidance Project of Heilongjiang Natural Science Foundation(No.LH2021H099)Start Fund of Postdoctoral Research in Heilongjiang Province(No.LBH-Q19188)+3 种基金Outstanding Youth Development Fund of Heilongjiang University of Chinese Medicine(No.2019JC06)Project of Heilongjiang Administration of Traditional Chinese Medicine(No.ZHY202094)Graduate Innovative Scientific Research Project of Heilongjiang University of Chinese Medicine(No.2020yjscx057)Natural Science Foundation of Heilongjiang Province(Key project,No.ZD2020H006)。
文摘Objective To investigate and reveal the underlying mechanism of the effect of total saponins from Dioscoreae nipponica Makino(TSDN)on the arachidonic acid pathway in monosodium urate(MSU)crystal-induced M1-polarized macrophages.Methods M1 polarization of RAW264.7 cells were induced by 1µg/mL lipopolysaccharide(LPS).The methylthiazolyldiphenyl-tetrazolium bromide method was then used to screen the concentration of TSDN.MSU(500µg/mL)was used to induce the gouty arthritis model.Afterwards,10µg/L TSDN and 8µmol/L celecoxib,which was used as a positive control,were added to the above LPS and MSU-induced cells for 24 h.The mRNA and protein expressions of cyclooxygenase(COX)2,5-lipoxygenase(5-LOX),microsomal prostaglandin E synthase derived eicosanoids(mPGES)-1,leukotriene B(LTB)4,cytochrome P450(CYP)4A,and prostaglandin E_(2)(PGE_(2))were tested by real-time polymerase chain reaction and Western blotting,respectively.The enzyme-linked immunosorbent assay was used to test the contents of M1 markers,including inducible nitric oxid synthase(NOS)2,CD80,and CD86.Results TSDN inhibited the proliferation of M1 macrophages and decreased both the mRNA and protein expressions of COX2,5-LOX,CYP4A,LTB4,and PGE_(2)(P<0.01)while increased the mRNA and protein expression of mPGES-1(P<0.05 or P<0.01).TSDN could also significantly decrease the contents of NOS2,CD80,and CD86(P<0.01).Conclusion TSDN has an anti-inflammation effect on gouty arthritis in an in vitro model by regulating arachidonic acid signaling pathway.
基金supported by the National Science Foundation of China(NSFC 81802196,81572129,81872877,91853109,and 81772335)Key Program of NSFC(81730067,China)+3 种基金Special Program of Chinese Academy of Science(XDA16020805,China)Jiangsu Provincial Key Medical Center Foundation(China)Jiangsu Provincial Medical Outstanding Talent Foundation(China)Jiangsu Provincial Key Medical Talent Foundation(China)。
文摘Osteoarthritis(OA),in which M1 macrophage polarization in the synovium exacerbates disease progression,is a major cause of cartilage degeneration and functional disabilities.Therapeutic strategies of OA designed to interfere with the polarization of macrophages have rarely been reported.Here,we report that SHP099,as an allosteric inhibitor of src-homology 2-containing protein tyrosine phosphatase 2(SHP2),attenuated osteoarthritis progression by inhibiting M1 macrophage polarization.We demonstrated that M1 macrophage polarization was accompanied by the overexpression of SHP2 in the synovial tissues of OA patients and OA model mice.Compared to wild-type(WT)mice,myeloid lineage conditional Shp2 knockout(c KO)mice showed decreased M1 macrophage polarization and attenuated severity of synovitis,an elevated expression of cartilage phenotype protein collagen II(COL2),and a decreased expression of cartilage degradation markers collagen X(COL10)and matrix metalloproteinase3(MMP3)in OA cartilage.Further mechanistic analysis showed that SHP099 inhibited lipopolysaccharide(LPS)-induced Toll-like receptor(TLR)signaling mediated by nuclear factor kappa B(NF-κB)and PI3K—AKT signaling.Moreover,intra-articular injection of SHP099 also significantly attenuated OA progression,including joint synovitis and cartilage damage.These results indicated that allosteric inhibition of SHP2 might be a promising therapeutic strategy for the treatment of OA.
