Abstract
We investigated ANF binding and stimulation of cGMP accumulation in isolated rat glomerular membranes in the presence and absence of amiloride and ATP. Amiloride enhanced high affinity binding of ANF without affecting its stimulation of cGMP. In contrast ATP decreased binding and decreased basal cGMP accumulation without affecting the ability of ANF to stimulate cGMP. These data indicate that ANF binding and stimulation of cGMP accumulation can be regulated independently supporting further the concept of receptor heterogeneity in renal glomerular membranes.
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