敲低periostin对PDGF引起的系膜细胞增殖和细胞外基质表达的影响

Role of periostin in PDGF-induced proliferation and extracellular matrix accumulation of mouse mesangial cells

目的 观察敲低periostin对PDGF引起的系膜细胞增殖和细胞外基质表达的影响。方法 体外培养小鼠系膜细胞,细胞以10 μg·L -1 PDGF刺激,分别于刺激0、2、4、6、12 h时收集细胞,Western blot检测periostin、PCNA、FN、TGF-β1蛋白的表达水平;细胞免疫荧光检测periostin蛋白表达和定位。另外,细胞随机分为control组、PDGF组、PDGF+空质粒转染(PDGF+sh-nc)组和PDGF+periostin沉默质粒(PDGF+sh-periostin)组,后3组以10 μg·L -1 PDGF孵育6 h后终止培养,Western blot检测periostin、PCNA、FN、TGF-β1表达水平。结果 PDGF上调periostin蛋白表达,6 h达到高峰,12 h明显回落;细胞免疫荧光检测结果显示,PDGF刺激下periostin在胞质表达明显增强。PDGF可导致PCNA、FN、TGF-β1表达增强。periostin沉默质粒能够抑制PDGF引起的系膜细胞增殖和细胞外基质表达,下调PCNA、FN、TGF-β1蛋白表达。结论 PDGF诱导periostin在体外培养的小鼠系膜细胞表达增加,并上调系膜细胞增殖水平和细胞外基质表达水平。periostin沉默质粒部分逆转PDGF引起的系膜细胞增殖和FN、TGF-β1蛋白表达。

Aim To investigate the role of periostin in PDGF-induced proliferation and extracellular matrix accumulation of mouse mesangial cells. Methods The effects of PDGF on periostin protein, cell proliferation and extracellular matrix accumulation were detected. The cells were collected at 0, 2,4, 6, 12 h after stimulation with PDGF(10 μg·L -1 ) to detect the expression of periostin, PCNA, FN and TGF-β1 by Western blot. The silencing effect of sh-periostin vector on periostin protein in mouse mesangial cells was identified by Western blot. Cells were randomly divided into control group, PDGF group, PDGF+ sh-nc group and PDGF+sh-periostin group to detect the role of periostin in PDGF-induced proliferation and extracellular matrix accumulation of mouse mesangial cells. Results PDGF could elevate periostin protein expression. Western blot result showed that periostin protein expression in PDGF-stimulated groups was significantly higher than that in 0h group, which was consistent with the result of immunofluorescence. Positive expression of periostin was located in cytoplasm. Western blot result showed that PCNA, FN and TGF-β1 protein in PDGF-stimulated groups increased as compared with 0h group. shRNA vector aimed at periostin(sh-periostin vector) could partially reverse PDGF-induced mesangial cell proliferation and extracellular matrix expression. PCNA, Fn and TGF-β1 expressions were attenuated significantly. Conclusions PDGF can enhance periostin protein expression and increase mouse mesangial cell proliferation and extracellular matrix accumulation. Periostin shRNA vector can partially reverse PDGF-induced mesangial cell proliferation and extracellular matrix generation.