畜牧兽医学报 ›› 2016, Vol. 47 ›› Issue (7): 1495-1501.doi: 10.11843/j.issn.0366-6964.2016.07.025

• 临床兽医 • 上一篇    下一篇

金黄色葡萄球菌对奶牛乳腺成纤维细胞TGF-β1/Smad信号通路及其转分化的影响

杨彬,徐丹丹,孙志鹏,赵佳琦,闫博巍,李晓婷,武瑞*   

  1. (黑龙江八一农垦大学动物科技学院,大庆 163319)
  • 收稿日期:2016-01-12 出版日期:2016-07-23 发布日期:2016-07-23
  • 通讯作者: 武瑞,教授,E-mail: fuhewu@126.com
  • 作者简介:杨彬(1982-),男,内蒙古呼和浩特人,讲师,博士,主要从事奶牛乳腺炎致病机制的研究,E-mail: yangbin_nm@126.com
  • 基金资助:

    黑龙江八一农垦大学博士后启动基金

The Effect of Staphylococcus aureus on TGF-β1/Smad Signaling Pathway and Transdifferentiation in Bovine Mammary Fibroblasts

YANG Bin,XU Dan-dan,SUN Zhi-peng,ZHAO Jia-qi,YAN Bo-wei,LI Xiao-ting,WU Rui*   

  1. (College of Animal Science and Technology,Heilongjiang Bayi Agricultural University,Daqing 163319,China)
  • Received:2016-01-12 Online:2016-07-23 Published:2016-07-23

摘要:

为探索金黄色葡萄球菌(S.aureus)对奶牛乳腺成纤维细胞(BMFB)TGF-β1/Smad信号通路及其转分化的影响,用热灭活金黄色葡萄球菌(0、10 4,10 5,10 6,10 7和10 8 CFU•mL-1)刺激BMFB,24 h后采用Real-time PCR 方法检测TGF-β1α-SMAcollagen-Ⅰ mRNA的转录量,Western blot方法检测α-SMA、collagen-Ⅰ及p-Smad2/3蛋白的表达量。使用TGF-β1受体特异性抑制剂SB-431542预处理细胞,再用105 CFU•mL-1热灭活金黄色葡萄球菌刺激细胞,24 h后采用Real-time PCR方法检测α-SMAcollagen-Ⅰ mRNA的转录量,Western blot方法检测α-SMA、collagen-Ⅰ及p-Smad2/3蛋白的表达量,免疫荧光法检测collagen-Ⅰ蛋白的表达量。结果显示,不同浓度热灭活金黄色葡萄球菌处理细胞的TGF-β1 mRNA的转录量显著升高(P <0.05或P <0.01),其中以105 CFU•mL-1刺激组的TGF-β1 mRNA的转录量最高。不同浓度灭活的金黄色葡萄球菌处理细胞的α-SMAcollagen-Ⅰp-Smad2/3的表达量均能显著升高(P<0.05或P <0.01),其中以105 CFU•mL-1刺激组的α-SMA、collagen-Ⅰ及p-Smad2/3的表达量最高。抑制剂SB-431542能够极显著抑制α-SMA、collagen-Ⅰ及p-Smad2/3的表达量(P<0.01)。结果提示,金黄色葡萄球菌能够通过TGF-β1/Smad信号通路诱导奶牛乳腺成纤维细胞转分化为肌成纤维细胞,本研究为揭示金黄色葡萄球菌性乳腺炎发生硬化的机制奠定基础。

Abstract:

This study aimed to investigate the effect of Staphylococcus aureus (S.aureus) on TGF-β1/Smad signaling pathway and transdifferentiation in bovine mammary fibroblasts (BMFB).BMFB were stimulated with heat-killed S.aureus (HKSA) at 10 4,10 5,10 6,10 7,10 8 CFU•mL-1.The transcription of TGF-β1,α-SMA and collagen-Ⅰ mRNA were detected by Real-time PCR after 24 h.The expression of α-SMA,collagen-Ⅰ and p-Smad2/3 protein were detected by Western blot.BMFB were pretreated with TGF-β1 receptor-specific inhibitor SB-431542,BMFB were stimulated with heat-killed S.aureus (HKSA) at 105 CFU•mL-1.The transcription of α-SMA and collagen-Ⅰ mRNA were detected by Real-time PCR after 24 h.The expression of α-SMA,collagen-Ⅰ and p-Smad2/3 protein were detected by Western blot.Immunofluorescence was used to detect collagen-Ⅰ expression.The results showed that the transcription level of TGF-β1 mRNA,expression of α-SMA,collagen-Ⅰ and p-Smad2/3 increased significantly at different concentration after 24 h stimulation compared with unstimulated BMFB (P<0.05).The expression of TGF-β1,α-SMA,collagen-Ⅰ and p-Smad2/3 reached the maximal level at 105 CFU•mL-1.The expression of α-SMA,collagen-Ⅰ and p-Smad2/3 were significantly reduced by pretreating BMFB with SB-431542 (P<0.01).The results indicate that TGF-β1/Smad signaling pathway plays an important role in S.aureus induced BMFB transdifferentiation.

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