MT对热应激奶牛外周血淋巴细胞凋亡枉关基因cytc和Fas表达水平的影响

为探讨外源性金属硫蛋白（Metallothionein，MT）对热应澈中国荷斯坦奶牛外周血淋巴细胞凋亡率及细胞周期的影响及其机理，选取20头中国荷斯坦奶牛经产泌乳母牛，随机均分为A、B、C、D4组，分别按每头0（对照）、40、8．0和120mg的剂量经颈静脉注射Zn—MT，于试验第1（注射Zn—MT之前）、21、36、51和61天逐头采取血样，测定不同剂量的外源性MT对热应激奶牛血淋巴细胞凋亡基因cvtc和Fas表达水平的影响。结果表明，注射外源性MT后，各试验组奶牛外周血淋巴细胞中促凋亡基因cvtc和Fas的表达水平均有不同程度的降低，其中，B组奶牛cytc基因表达水平的降幅达到显著（P〈0.05）水平，D组奶牛Fas基因表达水平的降幅表达水平的降幅达到极显著（P〈0．01）水平。

Effects of Metallothionein on and Expression of Cell Apoptosis Related Genes cytc and Fas in Peripheral Blood of Dairy Cattle under Heat Stress

TO research the effect of exogenous metallothionein （MT） on apoptosis rate and cell cycle of lymphocytes in peripheral blood of dairy cattle under heat stress, 20 lactating Chinese Holstein cows were selected and randomLy divided into group A, group B, group C and group D, Zn-MT in the levels of 0, 4.0, 8.0 and 12.0 mg were supplemented by intravenous injection respectively. Blood samples were collected at 1st ~,before injection） , 21st, 36th, 51st and 61st day, and the apoptosis related genes （cytc and Fast expression were determined. The results showed that the expression levels of cytc and Fas genes of lymphocytes in peripheral blood were decreased after injection of MT, and the expression level of cytc in group B was lower than control group significantly （P〈0.05） , the expression level of Fas in group D were decreased highly significantly （P〈0.01） .