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血管平滑肌(VSM)细胞和内皮细胞(EC)都表达K+通道,微血管平滑肌细胞至少表达4种不同类别的K+通道,内向整流性钾通道[inward rectiffer K+(KIR) channel];ATP敏感性钾通道[(ATP-sensitive K+(KATP)channel];电压门控式钾通道[voltage-gated K+(Kv)channel];大电导钙激活钾通道[the large conductance,Ca2+-activated K K+(MaxiK,BKCa)channel].