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“… potassium (15–50 mM) produced a dose‐related increase in basal NA release that was calcium dependent The potassium‐evoked release of NA … by preincubation with either (a) the selective α2‐adrenoceptor antagonist idazoxan (10−6‐10−4M) or (b) the thyrotrophin‐releasing hormone ( TRH ) analogue RX … 10−4M).”
“ Potassium and ouabain, a Na+/K+-ATPase inhibitor, stimulated TRH and C(HP) secretion in a graded fashion, but the magnitudes of C(HP) secretory responses were less than those of TRH.”