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- W2018682013 abstract "Long-lasting Ca 2+ (Ca L ) channels of the Ca v 1.2 gene family contribute to the pathogenesis of abnormal arterial tone in hypertension. The physiological stimulus that enhances Ca L channel current in the vascular smooth muscle cells (VSMCs) remains unknown. The present study investigated if high blood pressure triggers an upregulation of vascular Ca L channel protein. Rat aortae were banded between the origins of the left renal (LR) and right renal (RR) arteries to selectively elevate blood pressure in the proximal RR arteries. After 2 days, the immunoreactivity on Western blots corresponding to the pore-forming α 1C subunit of the Ca L channel was increased 3.25-fold in RR compared with LR arteries. This finding persisted at 28 days and was associated with abnormal Ca 2+ -dependent tone and higher Ca L currents in the VSMCs exposed to high pressure. Based on microelectrode studies indicating that RR arteries were depolarized compared with LR arteries, further studies examined if membrane depolarization, an inherent response of VSMCs to high blood pressure, increased α 1C expression. Isolated rat renal arteries were cultured for 2 days in low K + (4 mmol/L) or depolarizing high K + (30 mmol/L) media. Arteries preconditioned in high K + showed a 5.47-fold increase in α 1C expression, enhanced Ca L channel current, and elevated Ca 2+ -dependent tone. These findings provide the first direct evidence that high blood pressure upregulates the Ca L channel α 1C subunit in VSMCs in vivo and suggest that membrane depolarization is a potential signal involved in this interaction that may contribute to the development of abnormal vascular tone." @default.
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- W2018682013 date "2004-05-28" @default.
- W2018682013 modified "2023-10-15" @default.
- W2018682013 title "High Blood Pressure Upregulates Arterial L-Type Ca <sup>2+</sup> Channels" @default.
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- W2018682013 doi "https://doi.org/10.1161/01.res.0000131495.93500.3c" @default.
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