肌球蛋白活化的T淋巴细胞诱导心肌自身免疫反应

Myocardial autoimmune response induced by myosin activate T lymphocytes

目的研究心肌肌球蛋白活化的T淋巴细胞能否介导心肌的自身免疫反应。方法分离、提纯大鼠脾脏树突状细胞(DC)和T淋巴细胞,分为两组在体外混合培养活化组加入大鼠心肌肌球蛋白;未活化组不加大鼠心肌肌球蛋白。将活化组或未活化组的T淋巴细胞分别经尾静脉转输入大鼠体内。在转输后3d、1周和4周末处死大鼠,观察心肌的病理改变。结果转输活化T细胞的大鼠,于转输后3d即出现心肌的淋巴细胞浸润,1周末达到高峰伴有少许心肌坏死,4周末心肌的淋巴细胞浸润明显减轻,各组间差异有显著性(P<0.01)。转入活化T细胞大鼠的肝、肺、肾、脑和甲状腺等组织均未见淋巴细胞浸润。转输未活化T淋巴细胞的大鼠心肌未见淋巴细胞浸润。结论肌球蛋白活化的T淋巴细胞能够介导心肌的自身免疫反应。

AIM： To investigate whether myosin activated-T lymphocytes induce myocardial autoimmune response. METHODS： Dendritic ceils and T lymphocytes were isolated and purified from spleens of Lewis rats. After cocultured in the absence or presence of cardiac myosin （20 μg/mL）, the sensitized or unsensitized T lymphocytes were transferred into the naive syngeneic Lewis rats by a single tail vein infusion, respectively. The recipient rats were killed on the third day, at the first and fourth week and then the histopathological changes of the rats were observed. RESULTS： T lymphocyte infiltration was observed on the third day. It reached the peak with occasional myocardium necrosis at the first weekend. T cell infiltration distinctly lessened at the fourth weekend. No T lymphocyte infiltration was found in kidney, liver, lung, and brain. T lymphocyte infiltration wad not detected in the heart of the transferred unsensitized T lymphocytes of the rats. CONCLUSION： Myocardial autoimmune response can be induced by myosin activated T lymphocytes.