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Hypoxic inhibition of K+ channels in type I cells is believed to be of central importance in carotid body chemotransduction. We have recently suggested that hypoxic channel inhibition is mediated by AMP-activated protein kinase (AMPK). Here, we have further explored the modulation by AMPK of recombinant K+ channels (expressed in HEK293 cells) whose native counterparts are considered O2-sensitive in...
Whole-cell patch-clamp recordings were used to study voltage-gated Ca2+ channel currents in type I carotid body cells of young rats born and reared in normoxia or in a chronically hypoxic (CH) environment (10% O2). Currents activated at potentials of −40 mV and more positive, and typically peaked at 0 mV in both groups of cells. Steady-state inactivation curves were similar in the two populations...
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