TNF-α和IFN-γ及含有五种细胞因子的奶牛乳汁对奶牛乳腺纤维化影响的研究
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摘要
奶牛乳腺纤维化主要由奶牛乳腺炎引起,各种病因引起的奶牛乳腺炎均可导致奶牛乳腺不同程度的纤维化过程。纤维化的乳腺泌乳量降低,严重时发展为乳腺硬化导致奶牛淘汰。研究细胞因子在奶牛乳腺纤维化中的作用,对奶牛乳腺纤维化的防治具有重要意义。
     目前关于奶牛乳腺纤维化发生机制的研究报道很少,在奶牛乳腺纤维化过程中,除间质成纤维细胞(BMFB)能够产生细胞外基质(ECM)外,奶牛乳腺上皮细胞(BMEC)能否通过上皮-间质转化(EMT)形成肌纤维母细胞(MFB)并合成ECM仍不明确,与纤维化相关的一些细胞因子与BMEC的转分化及BMFB产生ECM的相互关系需要深入研究。本研究分别用不同浓度的TNF-α(1、5、10ng/mL)、IFN-γ (5、10、20ng/ml)及TNF-α/IFN-γ联合液(浓度比分别为1:1、1:2、1:5)作用于体外培养的BMEC和BMFB,于不同时刻(12h、24h、48h、72h)取细胞总RNA和总蛋白,分别用实时荧光定量RT-PCR和western-blot方法检测平滑肌肌动蛋白(α-SMA),结缔组织生长因子(CTGF)及胶原(ICOLIα1)mRNA及α-SMA蛋白表达水平。同时,根据细胞因子放免检测结果,用筛选出的含有五种细胞因子(TNF-α、IFN-γ、TGF-β1、bFGF、PDGF)的奶牛乳汁分别作用体外培养BMEC和BMFB,于不同的时刻(12h、24h、48h、72h),用实时荧光定量RT-PCR的方法检测含有五种细胞因子的奶牛乳汁对两种细胞α-SMA、CTGF和COLIα1mRNA相对表达量的影响。
     结果显示:外源性TNF-α对BMEC和BMFB α-SMA、CTGF和COLIα1三种基因mRNA表达基本起促进作用,对BMFB α-SMA的蛋白表达也起促进作用,但未检测到BMEC α-SMA蛋白的表达;外源性IFN-γ对BMEC和BMFB α-SMA、CTGF和COLIα1三种基因mRNA及α-SMA蛋白表达均呈抑制作用。不同比例的TNF-α/IFN-γ联合液均能明显抑制BMEC CTGF、α-SMA、COLIα1mRNA及α-SMA蛋白表达,且负时效、负量效关系明显;对BMFB CTGF、α-SMAmRNA及α-SMA蛋白表达也起明显抑制作用,但对COLIα1mRNA表达起促进作用。TNF-α和TGF-β高含量的乳汁作用BMEC和BMFB在各时刻(12h、24h、48h、72h)α-SMA、CTGF和COLIα1mRNA表达量均比低含量的乳汁作用高; IFN-γ高含量的乳汁对BMEC CTGF和COLIα1mRNA表达量的抑制作用较低含量的乳汁强,而对α-SMAmRNA表达量作用相反;对BMFB CTGF和COLIα1mRNA表达量的抑制作用,12h、24h含量高的乳汁较含量低的乳汁作用强,但48h、72h却相反,而对BMFB α-SMA的mRNA表达量的抑制作用,IFN-γ高含量的乳汁比低含量的乳汁强。bFGF高含量的乳汁作用BMEC和BMFB,CTGF和COLIα1mRNA表达量均比bFGF低含量的乳汁作用高,但对α-SMA mRNA表达的抑制作用却相反。PDGF-BB高含量的乳汁作用BMEC,CTGF和COLIα1mRNA表达量均比低含量的乳汁作用高,但对α-SMA mRNA表达的抑制作用却相反;PDGF-BB高含量的乳汁作用BMFB,α-SMA mRNA表达量均比低含量的乳汁作用高,而对CTGF和COLIα1mRNA表达的影响却相反。
     研究结果表明,两种外源性细胞因子及含有细胞因子的乳汁对奶牛乳腺上皮细胞和成纤维细胞中纤维化指标的表达均产生一定的作用,为进一步探究乳腺纤维化的发生机制奠定了基础。
Bovine mammary fibrosis is an important pathological process which wasmainly caused by bovine mastitis that is a major disease in dairy cow. During theprocess of mammary gland fibrosis, the milk yield will decrease, the dairy cow will beeliminated as a result of mammary gland sclerosis in seriously cases. It’s significantthat study the role of cytokines in the bovine mammary gland fibrosis for preventionand control of bovine mammary gland fibrosis.
     There were few reports on mechanism of bovine mammary fibrosis. In this study,the bovine mammary epithelial cells and fibroblast were plated in six-well plates andafter overnight incubation at37℃the cells were treated withTNF-α(1,5,10ng/mL)and IFN-γ(5,10,20ng/ml) and incubate the two kinds of cells with cow milkcontaining TNF-α, IFN-γ, TGF-β1, bFGF, PDGF selected by Cytokine immunedetection for12h,24h,48h and72h. Total RNA from each sample was extractedusing Trizol reagent following the manufacturer’s instructions. we detected the effectof TNF-α,IFN-γ and cow milk containing five cytokines to the mRNA expression ofthe three transdifferentiation indicators (CTGF, α-SMA and COL Ⅰα1) in the twokinds of cells by Real-Time quantitative PCR with β-actin as an internal referencegene. We extracted protein in12h,24h,48h and72h, then detected the effect ofdifferent concentrations of TNF-α(1,5,10ng/mL),IFN-γ(5,10,20ng/ml) to the proteinexpression lever of α-SMA by Western blot method. Meanwhile, we incubated thetwo kinds of cells cultured with associated cell supernatant of TNF-α, IFN-γ (1:1,1:2,1:5) in vitro. Then detected the expression of mRNA of CTGF, α-SMA and COL Ⅰα1by Real-Time quantitative PCR, and detected the protein expression of α-SMA byWestern blot in12h,24h,48h and72h.
     The study indicated that exogenous TNF-α increased the expression of α-SMA, CTGF, COLⅠ α1mRNA in the bovine mammary epithelial cells and fibroblasts, andthe protein expression of α-SMA in bovine mammary fibroblasts, while the proteinexpression of α-SMA wasn’t detected in the bovine mammary epithelial cells.Exogenous IFN-γ inhibited the expression of α-SMA, CTGF and COLⅠ α1mRNA inthe bovine mammary epithelial cells and fibroblasts. Exogenous IFN-γ inhibited theexpression of α-SMA, CTGF and COL Ⅰα1mRNA and the protein expression ofα-SMA in the bovine mammary epithelial cells and fibroblasts. The cow milk selectedcontaining higher levels of TNF-α promoted the expression of α-SMA, CTGF,COL Ⅰα1mRNA in the BMEC and BMFB than the cow milk of low TNF-α. Thecow milk selected containing higher concentration of IFN-γ promoted the expressionof CTGF, COLⅠ α1mRNA in the BMEC than the cow milk of lower IFN-γ. Butα-SMA mRNA expressed lower by cow milk with IFN-γ of higher concentration thanlow in the BMEC. The cow milk selected containing higher concentration of IFN-γdecreased the expression of CTGF, COL Ⅰα1mRNA in earlier stage (12h,24h) andincreased in later stage(48h,72h) in the fibroblasts, but the higher concentrations ofIFN-γ have a inhibited tendency on the expression of α-SMA mRNA in thefibroblasts. The cow milk selected containing higher concentration of TGF-β1promoted the expression of α-SMA, CTGF, COL Ⅰ α1mRNA in the BMEC andBMFB than the cow milk of low TGF-β1. The cow milk selected containing higherconcentration of bFGF promoted the expression of CTGF, COLⅠ α1mRNA in theBMEC and BMFB than the cow milk of low bFGF, but the higher concentrations ofbFGF have a inhibited tendency on the expression of α-SMA mRNA. The cow milkselected containing higher concentration of PDGF-BB mainly plays a positive role onthe expression of CTGF and COL Ⅰα1mRNA in the bovine mammary epithelial cells,but the mRNA expression of α-SMA was increased with lower concentration ofPDGF-BB. The cow milk selected containing higher concentration of PDGF-BBmainly played a positive role on the expression of α-SMA mRNA in the bovinemammary fibroblasts, but the expression of CTGF and COL Ⅰα1mRNA wereincreased with lower concentration of PDGF-BB. The associated cell supernatant ofdifferent concentrations of TNF-α, IFN-γ inhibited the expression of α-SMA, CTGF and COL Ⅰα1mRNA and the protein expression of α-SMA in the bovine mammaryepithelial cells, and showed typical dose and time effect relationship.The associatedcell supernatant of different concentrations of TNF-α, IFN-γ inhibited the expressionof α-SMA, CTGF mRNA and the protein expression of α-SMA in the bovinemammary fibroblasts, but promote the expression of COL Ⅰα1mRNA in the bovinemammary fibroblasts.
     The results suggested that the two kind of exogenous cytokines and the cow milkcontaining cytokines have some certain effect on the expression of the fibrosisindexes both the bovine mammary epithelial cells and fibroblasts, and laid afoundation for the further study of the mechanisms of bovine mammary fibrosis.
引文
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