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目的 SD乳鼠心肌成纤维细胞(CFs)和成年SD大鼠脾脏调节性T细胞(Tregs)体外共培养,探讨二者相互作用,并观察依普利酮(EPL)对其的影响.方法 免疫磁珠法分选大鼠Tregs,差速贴壁法分选大鼠CFs,分为CFs、CFs+ Tregs、CFs+Tregs+EPL(30 μmol.L-1)、Tregs组.孵育后,CCK-8法检测CFs的增殖情况;ELISA法检测CFs分泌Ⅰ型胶原、Ⅲ型胶原和基质金属蛋白酶2(MMP-2)的蛋白相对表达水平;RT-qPCR检测Tregs的Kvl.3、KCa3.1、CRAC通道mRNA的相对表达水平;In-Cell Westem blot法检测Tregs的Kv1.3通道蛋白质的表达水平.结果 共培养48 h后,CFs增殖趋稳,共培养组CFs增殖明显(P＜0.01),EPL可明显抑制其增殖(P ＜0.01);CFs分泌的Ⅰ型、Ⅲ型胶原和MMP-2的相对表达水平均明显增加(P＜0.01),EPL可明显抑制其增加(P＜0.01);Tregs的Kv1.3、KCa3.1、CRAC通道mRNA的相对表达水平分别增加6.95、1.99、1.53倍(CFs+Tregs vs Tregs,P＜0.01),EPL明显抑制Kv1.3、KCa3.1 mR-NA的表达(CFs+Tregs+EPLvsCFs+Tregs,P＜0.01),其中Kv1.3通道的抑制最为明显;Tregs的Kv1.3通道蛋白增加了67.9％(CFs+Tregs vs Tregs,P＜0.01),EPL可明显抑制其表达(P＜0.01).结论 体外Treg与CFs共培养48h后,Tregs能明显促进CFs的增殖,EPL可以通过下调Tregs细胞膜上Kv1.3通道的表达,抑制Tregs的活化/增殖,间接抑制心肌纤维化.“,”Aim To establish a co-incubation system in cardiac fibroblasts of SD neonatal rats and spleen CD4+ CD25 + regulatory T lymphocytes (Tregs) of normal adult SD rats,and to investigate the effects of eplerenone(EPL) on the interaction of two cells and the relationship with the Kvl.3 channel on Tregs cell membrane.Methods The spleen Tregs of normal adult SD rats were sorted by immunomagnetic bead sorting,and the myocardial fibroblasts of SD rats were isolated by differential adherence method.The experiment was conducted in the following groups:CFs,CFs + Tregs,CFs + Tregs + EPL,Tregs.The proliferation of CFs was detected by CCK-8 method.The expression levels of type Ⅰ collagen,type m collagen and matrix metalloproteinase 2 (MMP-2) secreted by CFs were detected by ELISA.The mRNA expression levels of Kv1.3,KCa3.1 on Tregs cell membrane and intracellular CRAC channel were detected by RT-qPCR technique.Tregs cell membrane Kvl.3 channel protein expression levels were determined by In-Cell Western blot.Results After 48 h incubation of the co-culture system,the cell proliferation was stable.CFs proliferation was marked(P ＜0.01),which could be inhibited by EPL(P ＜0.01).The type Ⅰ,type Ⅲ collagen and MMP-2 secreted by CFs increased (P ＜ 0.01).The expression levels of Kv1.3,KCa3.1 and CRAC channel mRNA in Tregs increased by 6.95,1.99 and 1.53 fold (CFs + Tregs vs Tregs,P ＜0.01),EPL decreased the mRNA level of each channel (CFs +Tregs + EPLvs CFs + Tregs,P＜0.01),and the decrease of Kv1.3 channel was the most significant (P ＜ 0.01).The Kv1.3 channel protein of Tregs increased by 67.9％ (CFs + Tregs vs Tregs,P ＜0.01),which could be inhibited by EPL(P ＜ 0.01).Conclusions Tregs cultured with CFs after 48 h can significantly promote the proliferation of CFs,and EPL can down-regulate the Kv1.3 channel expression on the Tregs membrane and inhibit the activation/proliferation of Tregs,indirectly inhibiting myocardial fibrosis.