ABSTRACT
To investigate the changes in activation and proliferation of Tregs after targeted RNA inter-ference of Kvl. 3 channel genes and in vitro administration of eplerenone (EPL). Methods After lenti-virus vector was transfected to regulatory T cells (Tregs) of rats, qPCR and whole-cell patch-clamp methods were used to detect gene knockout efficiency, and EOSA method was used to detect cytokine secretion IL-10 and TGF-p levels of Tregs group,Tregs + EPL group,RNAi-Tregs group,and RNAi-Tregs + EPL group. Results Lentivirus vector was successfully transfected into Tregs cells, and the mRNA level and current density of Kvl. 3 channel was 78% and 71.3% respectively; compared with Tregs group, extracellular and intracellular TGF-p levels in RNAi-Tregs group were significantly reduced (P < 0. 01), and extracellular and intracellular TGF-(3 levels in Tregs + EPL group were also reduced (P < 0. 05 ) ; compared with RNAi-Tregs group, extracellular and in-tracellular TGF-fJ levels in RNAi-Tregs + EPL group showed no change. However, IL-10 levels in Tregs group,Tregs + EPL group, RNAi-Tregs group, RNAi-Tregs + EPL group showed no significant change. Conclusions Kvl.3 channel mediates the activation and proliferation of Tregs cells, while EPL can reduce the activation and proliferation of Tregs cells by directly inhibiting Kvl.3 channel and reducing the secretion of TGF-fi levels, further indicating that EPL is a specific blocker of Kvl. 3 channel.