RhoA/Rho激酶信号通路在TGF-β1诱导的人皮肤成纤维细胞表型转化中的作用
胡永亮刘真焦大凯马恬王常勇贾赤宇
目的 观察TGF-[1对人皮肤成纤维细胞表型转化的作用是否受到RhoA/Rho激酶 信号通路的影响,以探究该通路是否参与了人皮肤成纤维细胞的表型转化。方法 原代培养人皮 肤成纤维细胞,将第4代细胞用TGF-β1( 10 ng/ml)刺激后,分不同作用时间(0、3、6、24h)提取细胞 内总蛋白。BCA法测定总蛋白浓度,Western -blot检测α-SMA的表达水平;并用相同的方法检测不 同浓度TGF-β1(0、2、10、50 ng/ml)刺激人皮肤成纤维细胞后,α-平滑肌肌动蛋白(α-smooth muscle actin,α-SMA)的表达水平。用RhoA/Rho激酶信号通路阻断剂Y-27632处理后,再用TGF-β1刺激, 作为实验组,将未作处理的正常细胞作为空白对照组,Y-27632(10 μmol/L)组作为阴性对照组,只 用TGF-β1( 10 ng/ml)刺激组作为阳性对照组,分别检测α-SMA的表达差异。使用ANOVA对蛋白 表达量进行统计学分析,P <0.05为差异有统计学意义。结果 10 ng/ml TGF-β1按不同作用时间 刺激人皮肤成纤维细胞后,α-SMA的表达量分别为:0h为1.0,3h为1.9+0.2、6h为2.1±0.1, 24 h为3.1±0.1。24 h较其他3个时间点α-SMA表达量明显上升(n=4,P<0.05)。不同浓度 TGF-β1刺激人皮肤成纤维细胞后,α-SMA的表达量分别为:0 ng/ml为1.0,2 ng/ml为1.4±0.2, 10 ng/ml为3.2±0.1,50 ng/ml为3.1±0.2。10 ng/ml表达量明显高于0 ng/ml和2 ng/ml(n =4, P <0. 05),较50 ng/ml差异无统计学意义(n=4,P>0.05)。用Y-27632(10 μmol/L)处理后,再用 TGF-β1刺激,细胞的表型转化明显受到抑制,实验组α-SMA的表达量(1.2±0.2)较阳性对照组 (2.9±0.1)明显降低(n=5,P <0.05),与空白对照组(1.0)和阴性对照组(1.1±0.1)相比差异均 无统计学意义(n=5,P>0. 05)。结论 RhoA/Rho激酶信号通路参与了 TGF-β1诱导的人皮肤成纤 维细胞表型转化过程。
成纤维细胞; RhoA/Rho激酶信号通路;转化生长因子β1; α-平滑肌肌动蛋白
The effect of RhoA/Rho kinase signal pathway on TGF-β1-induced phenotypic differentiation of human dermal fibroblasts HU Yong-liangLIU ZhenJIAO Da-kai
MA TianWANG Chang-yong
JIA Chi-yuCenter of Plastic Surgery and Burn Repair, 309 th Hospital of PLA, Beijing 100091, China
10. 3760/cma. j. issn. 1009-4598. 2011.05. 015国家自然科学基金(30772259)
作者单位:100091 北京,解放军第309医院整形美容烧伤修复中心(胡永亮、刘真、马恬、贾赤宇);军事医学科学院基础医学研究所组织工程研究室(王常勇);航空工业中心医院整形外科(焦大凯)
Objective To examine the effect of RhoA/Rho kinase signal pathway on TGF-β1-induced phenotypic differentiation of human dermal fibroblasts. Methods The 4th generation of primary cultured human dermal fibroblasts were stimulated with TGF-β1 (10 ng/ml). The expression of α-SMA was detected after treatment with TGF-β1 for 0, 3, 6, and 24 h. The expression of t-SMA was also detected after treatment with different concentration of TGF-β1 (0, 2, 10, 50 ng/ml). Then the human dermal
fibroblasts (4th generation) were stimulated with TGF-31 ( 10 ng/ml) after being treated with the RhoA/Rho kinase signaling pathway inhibitor Y-27632 (l0umol/ml). The fibroblasts were treated with nothing as sham control, or with Y-27632 (10umol/L) only as negative control group, or with TGF-β1 (10 ng/ml) only as positive control group. The expression of α-SMA was detected in all the groups. Protein expression
万方数据was analyzed with ANOVA statistical method. Results α-SMA expression in fibroblasts with 10 ng/ml TGF-β1 stimulation for 0, 3, 6, 24 h was 1.0, 1.9 +0.2, 2. 1 +0. 1, 3.1 +0. 1, respectively, α-SMA expression in 24 h group was significantly higher than that in other three groups ( n = 4, P < 0. 05 ).α-SMA expression in human dermal fibroblasts after stimulation with different concentration of TGF-β1 ( 0,2, 10, 50 ng/ml) was 1.0, 1.4 ±0. 2, 3.2 ±0. 1, 3.1 ± 0. 2, respectively, α-SMA expression in 10 ng/ml group was significantly higher than that in 2 ng/ml group and control group ( n = 4, P < 0. 05 ). There was no statistical difference in α-SMA expression between 10 ng/ml group and 50 ng/ml group (n =4, P >0. 05 ). With both Y-27632 (10 μmol/L) and TGF-β1 stimulation, the cell phenotype differentiation was inhibited. α-SMA expression in experimental group ( 1.2 ± 0. 2 ) was significantly reduced, when compared with that in positive control group ( 2. 9 ± 0. 1 ) ( n = 5, P < 0. 05 ). There was no significant difference ( n = 5, P > 0.05 ) in α-SMA expression between control group ( 1.0 ) and negative control group ( 1.1 ±0. 1 ). Conclusions RhoA/Rho kinase signaling pathway should be involved in TGF-β1-induced phenotypic differentiation of human dermal fibroblasts.Fibroblast; RhoA/Rho kinase signal pathway; Transforming growth factor-beta1 ;α-smooth muscle actin
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缓冲液清洗2遍,然后用细胞裂解液lysisbuffer
(10mmoL/LTris—HCl、150mmol/LNaCl、0.1%SDS、
1%TritonX一100、10ng/mlAprotinin、2ug/ml
Leupeptin、lmmol/I.PMSF)裂解细胞,冰卜孵育
15min。将裂解物进行离心12000r/rain,离心半径7cm,4℃,10rain,将卜-清分离到I.5mlEppendorf
管中。用BCA法测定蛋白浓度,最后制备电泳样
品,一20℃冻存。1.2.6Western—blot:取细胞总蛋白电泳样品(0【一SMA:总蛋白1斗g,10%SDSPAGE;RhoA:总蛋白10ug,12%SDSPAGE)SDSPAGE。再将凝胶上
的蛋白用半干法电转至PVDF膜上,5%脱脂奶粉4℃封闭过夜,分别选用0【一SMA一抗1:3000,B.
actin一抗1:4000;用TBST洗3次,每次10
min。
山羊抗鼠二抗l:10000,各室温孵育lh,用TBST
洗3次,每次10rain。洗涤后的膜用WesternECL
发光剂室温下反应5min,最后暗室曝光成像。
1.2.7统计学方法:用软件ImageJ1.42分析数据,统计表达差异,得出结论。使用ANOVA进行统汁学分析,P<0.05为差异有统计学意义。2结果2.1不同时问TGF—B,对人皮肤成纤维细胞表型转化的影响10ng/ml