ABSTRACT
Objective To investigate the effect of alizarin on BKCa channel beta subunit and electrophysiological characteristics in interlobar renal artery of SHR.Methods Tail artery pressure measurement instrument,pressure myograph system,whole cell patch clamp technique and Western blot were used to measure the change of systolic pressure of SHR,renal interlobar arterial diameter,single vascular smooth muscle cell electrophysiological characteristics and expression of the BKCa channel beta subunit before and after alizarin intervention,respectively.Results (1) SHR systolic pressure was decreased after alizarin intervention (P ＜ 0.01).(2) ibTX inhibited alizarin-mediated renal interlobar arterial relaxation (P ＜ 0.01).(3) Alizarin enhanced BKCa channel-mediated outward currents (P ＜ 0.05).(4) Alizarin up-regulated BKCa channel beta subunits after alizarin intervention (P ＜ 0.01).Conclusion Alizarin reduced SHR systolic pressure and relaxed interlobar renal artery by enhancement BKCa currents via mediation of the function of beta subunits.