Vitamin A (VA) plays an essential role in modulating both the gut microbiota and gut barrier function.Short-chain fatty acids (SCFAs),as metabolites of the gut microbiota,protect the physiological intestinal barrier;h...Vitamin A (VA) plays an essential role in modulating both the gut microbiota and gut barrier function.Short-chain fatty acids (SCFAs),as metabolites of the gut microbiota,protect the physiological intestinal barrier;however,they are compromised when VA is deficient.Thus,there is an urgent need to understand how and which SCFAs modulate colonic epithelial barrier integrity in VA deficiency (VAD).Herein,compared with normal VA rats (VAN),at the beginning of pregnancy,we confirmed that the colonic desmosome junction was impaired in the VAD group,and the amounts of acetate,propionate,and butyrate declined because of the decreased abundance of SCFA-producing bacteria (Romboutsia ,Collinsella ,and Allobaculum ).The differentially expressed genes correlated with the gut barrier and the histone deacetylase complex between the VAD and VAN groups were enriched by RNA sequencing.In the VAD group,the expression levels of colonic CEA cell adhesion molecule 1 (CEACAM1) were down-regulated,and the levels of histone deacetylase 1 (HDAC1) and HDAC3 were up-regulated.Intriguingly,the above changes in the VAD groups were rescued by VA supplementation in the early postnatal period.Further study indicated that in Caco-2 cells,butyrate treatment significantly repressed the enrichment of HDAC3 on the promoter of the CEACAM1 gene to induce its expression.Our findings support that butyrate intervention can alleviate the impairment of colonic barrier function caused by VAD,and timely postnatal VA intervention may reverse the damage caused by VAD on gut barrier integrity during pregnancy.展开更多
Dear Editor,T-cell infection by SARS-CoV-2 and associated immune responses are correlated with disease severity and prognosis of COVID-19.Lymphopenia is associated with increased disease severity in COVID-19.Significa...Dear Editor,T-cell infection by SARS-CoV-2 and associated immune responses are correlated with disease severity and prognosis of COVID-19.Lymphopenia is associated with increased disease severity in COVID-19.Significantly lower circulating T and B cell counts were observed in patients who died from COVID-19 compared with survivors.Moreover,SARS-CoV-2 infection causes aberrant lymphocyte activation and dysfunction.展开更多
基金supported by grants from The National Natural Science Foundation of China(No.31971089)the General Project of Chongqing Natural Science Foundation(China)(No.CSTB2022NSCQ-MSX0107)the Scientific Research Innovation Project for Postgraduates in Chongqing City(China)(No.CYS19198).
文摘Vitamin A (VA) plays an essential role in modulating both the gut microbiota and gut barrier function.Short-chain fatty acids (SCFAs),as metabolites of the gut microbiota,protect the physiological intestinal barrier;however,they are compromised when VA is deficient.Thus,there is an urgent need to understand how and which SCFAs modulate colonic epithelial barrier integrity in VA deficiency (VAD).Herein,compared with normal VA rats (VAN),at the beginning of pregnancy,we confirmed that the colonic desmosome junction was impaired in the VAD group,and the amounts of acetate,propionate,and butyrate declined because of the decreased abundance of SCFA-producing bacteria (Romboutsia ,Collinsella ,and Allobaculum ).The differentially expressed genes correlated with the gut barrier and the histone deacetylase complex between the VAD and VAN groups were enriched by RNA sequencing.In the VAD group,the expression levels of colonic CEA cell adhesion molecule 1 (CEACAM1) were down-regulated,and the levels of histone deacetylase 1 (HDAC1) and HDAC3 were up-regulated.Intriguingly,the above changes in the VAD groups were rescued by VA supplementation in the early postnatal period.Further study indicated that in Caco-2 cells,butyrate treatment significantly repressed the enrichment of HDAC3 on the promoter of the CEACAM1 gene to induce its expression.Our findings support that butyrate intervention can alleviate the impairment of colonic barrier function caused by VAD,and timely postnatal VA intervention may reverse the damage caused by VAD on gut barrier integrity during pregnancy.
基金This research was supported by the National Key R&D Program of China(2020YFA0509000 to J.C.)the National Natural Science Foundation of China(32030024,31830112,and 31525016 to J.C.,92169112 and 82161138002 to S.J.)+2 种基金Program of Shanghai Academic Research Leader(19XD1404200)Shanghai Municipal Science and Technology Major Project(ZD2021CY001 to S.J)National Ten Thousand Talents Program.The authors gratefully acknowledge the support of the SA-SIBS scholarship program.
文摘Dear Editor,T-cell infection by SARS-CoV-2 and associated immune responses are correlated with disease severity and prognosis of COVID-19.Lymphopenia is associated with increased disease severity in COVID-19.Significantly lower circulating T and B cell counts were observed in patients who died from COVID-19 compared with survivors.Moreover,SARS-CoV-2 infection causes aberrant lymphocyte activation and dysfunction.
