Add time:08/25/2019         Source:sciencedirect.com

Binding studies revealed the presence of a single class of high affinity binding sites for atriopeptin III on rabbit lung membranes. An apparent dissociation constant (Kd) of 0.32 nM and a binding capacity of 166 fmol/mg protein was determined. Binding was time-dependent and saturable. The relative binding affinities of atrial peptide analogs correlated well with their potencies in eliciting relaxation of norepinephrine-contracted rabbit aorta strips. Unrelated peptide hormones did not compete for the atriopeptin binding site on rabbit lung membranes. The atrial peptide binding data are similar to those obtained for other tissues and indicate the presence of a physiologically relevant atrial peptide receptor in lung.

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