Different Effects of Hypertension and Age on the Function of Large Conductance Calcium‐ and Voltage‐Activated Potassium Channels in Human Mesentery Artery Smooth Muscle Cells

BackgroundLarge‐conductance calcium‐ and voltage‐activated potassium channels (BKCa channels) play important roles in the maintenance of vascular tone, and their dysregulation is associated with abnormal vascular relaxation and contraction. We tested the changes in BKCa channel properties in patients at different ages to assess the effects of hypertension and aging on the functional changes of BKCa channels. Methods and ResultsPatch clamp was performed to detect the activities of BKCa channels in freshly isolated human mesenteric artery smooth muscle cells from younger patients (aged ≤45 years) without hypertension, older patients (aged ≥65 years) without hypertension, and older patients with hypertension. The expression of mRNA and protein from BKCa channels was evaluated by reverse transcription polymerase chain reaction and Western blot analysis, respectively. Results showed that the whole‐cell current density, spontaneous transient outward current, and Ca2+ sensitivity of the artery smooth muscle cell...