目的探讨补体C5a及受体(C5aR)对人肾间质成纤维细胞(human renal interstitial fibroblasts,hRIFs)增殖及纤维化相关因子表达的影响。方法原代培养hRIFs细胞,对细胞进行鉴定后,检测C5aR表达情况;同用C5a和C5aR拮抗剂分别对hRIFs处理后...目的探讨补体C5a及受体(C5aR)对人肾间质成纤维细胞(human renal interstitial fibroblasts,hRIFs)增殖及纤维化相关因子表达的影响。方法原代培养hRIFs细胞,对细胞进行鉴定后,检测C5aR表达情况;同用C5a和C5aR拮抗剂分别对hRIFs处理后检测细胞增殖、细胞外基质蛋白(fibronectin,Collagen-I)以及转化生长因子-β1(TGF-β1)的蛋白表达情况。结果hRIFs细胞vimentin蛋白表达阳性,desmin蛋白表达阴性,C5aR表达于hRIFs细胞表面。MTS实验结果显示:与对照组相比,C5a纯品(浓度分别为10,15,20nmol/L)刺激后第2h,8h的A值差异无统计学意义(P>0.05),刺激后第24h的A值(0.217±0.037 vs 0.613±0.016,0.793±0.041,0.887±0.039)显著升高,差异有统计学意义(t=4.891,4.211,8.408,均P<0.05)。与C5a纯品组相比,C5a纯品+C5aR拮抗剂组的A值明显降低(0.887±0.039 vs 0.424±0.016),差异有统计学意义(t=8.657,P<0.05)。Western-Blot结果显示,与对照组相比,补体C5a(20nmol/L)刺激后第24h,fibronectin(26091±128 vs 15400±105),Collagen-I(31229±129 vs 24823±136)以及TGF-β1(27855±161 vs 20326±152)蛋白表达水平都有明显增加,差异具有统计学意义(t=4.891,5.820,2.311,均P<0.05)。与C5a纯品组相比,C5a纯品+C5aR拮抗剂组fibronectin(22188±132 vs 26091±128),Collagen-I(27181±113 vs 31229±129)以及TGF-β1(25013±139 vs 27855±161)蛋白表达水平显著降低,差异具有统计学意义(t=2.349,1.618,3.774,均P<0.05)。结论补体C5a-C5aR相互作用可导致hRIFs细胞增殖、促纤因子TGF-β1表达升高及细胞外基质蛋白生成增加,对肾间质纤维化具有重要意义。展开更多
The complement C5 anaphylatoxin receptor is a member of the seven transmembrane-spanning G protein-coupled receptor superfamily that signals through Gcxi and Gtz16. C5aR is mostly expressed on neutrophils, macrophages...The complement C5 anaphylatoxin receptor is a member of the seven transmembrane-spanning G protein-coupled receptor superfamily that signals through Gcxi and Gtz16. C5aR is mostly expressed on neutrophils, macrophages and endothelial cells. C5a and C5aR interaction plays an important role in numerous biological effects such as in vivo cytokine storm which results in inflammatory damage. Considering the limitation of collection of human peripheral blood neutrophils and their short half life, the stably transfected cell line for studying the biological effects of C5aR is needed. In this study, we transfected C5aR gene into Molt-4 cell line and examined the function of ectopic C5aR. Our results showed stable expression of the C5aR in Molt-4 cell line and their interaction with human C5a induced ERKI/2 phosphorylation, Ca＋＋ influx. This stable transfected cell line may provide a useful tool for studying signal pathways related to C5a and C5aR interplay and antibody development specific for C5aR. Cellular ＆ Molecular Immunology.展开更多
文摘目的探讨补体C5a及受体(C5aR)对人肾间质成纤维细胞(human renal interstitial fibroblasts,hRIFs)增殖及纤维化相关因子表达的影响。方法原代培养hRIFs细胞,对细胞进行鉴定后,检测C5aR表达情况;同用C5a和C5aR拮抗剂分别对hRIFs处理后检测细胞增殖、细胞外基质蛋白(fibronectin,Collagen-I)以及转化生长因子-β1(TGF-β1)的蛋白表达情况。结果hRIFs细胞vimentin蛋白表达阳性,desmin蛋白表达阴性,C5aR表达于hRIFs细胞表面。MTS实验结果显示:与对照组相比,C5a纯品(浓度分别为10,15,20nmol/L)刺激后第2h,8h的A值差异无统计学意义(P>0.05),刺激后第24h的A值(0.217±0.037 vs 0.613±0.016,0.793±0.041,0.887±0.039)显著升高,差异有统计学意义(t=4.891,4.211,8.408,均P<0.05)。与C5a纯品组相比,C5a纯品+C5aR拮抗剂组的A值明显降低(0.887±0.039 vs 0.424±0.016),差异有统计学意义(t=8.657,P<0.05)。Western-Blot结果显示,与对照组相比,补体C5a(20nmol/L)刺激后第24h,fibronectin(26091±128 vs 15400±105),Collagen-I(31229±129 vs 24823±136)以及TGF-β1(27855±161 vs 20326±152)蛋白表达水平都有明显增加,差异具有统计学意义(t=4.891,5.820,2.311,均P<0.05)。与C5a纯品组相比,C5a纯品+C5aR拮抗剂组fibronectin(22188±132 vs 26091±128),Collagen-I(27181±113 vs 31229±129)以及TGF-β1(25013±139 vs 27855±161)蛋白表达水平显著降低,差异具有统计学意义(t=2.349,1.618,3.774,均P<0.05)。结论补体C5a-C5aR相互作用可导致hRIFs细胞增殖、促纤因子TGF-β1表达升高及细胞外基质蛋白生成增加,对肾间质纤维化具有重要意义。
基金supported by the grants from the National Key Basic Research Program of China(2007CB512406)the National Natural Science Foundation of China(30571732)National"863"Fund Grant of China(2006AA02A254).
文摘The complement C5 anaphylatoxin receptor is a member of the seven transmembrane-spanning G protein-coupled receptor superfamily that signals through Gcxi and Gtz16. C5aR is mostly expressed on neutrophils, macrophages and endothelial cells. C5a and C5aR interaction plays an important role in numerous biological effects such as in vivo cytokine storm which results in inflammatory damage. Considering the limitation of collection of human peripheral blood neutrophils and their short half life, the stably transfected cell line for studying the biological effects of C5aR is needed. In this study, we transfected C5aR gene into Molt-4 cell line and examined the function of ectopic C5aR. Our results showed stable expression of the C5aR in Molt-4 cell line and their interaction with human C5a induced ERKI/2 phosphorylation, Ca＋＋ influx. This stable transfected cell line may provide a useful tool for studying signal pathways related to C5a and C5aR interplay and antibody development specific for C5aR. Cellular ＆ Molecular Immunology.
