Inactivation of atrial natriuretic factor in blood

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Abstract
Tissue extracts of rat heart atria contain a family of peptides with natriuretic and vasorelaxant properties. It has been shown by others that inactivation of this atrial natriuretic factor may involve endogenous peptidases. The present experiments demonstrate that incubation in blood in vitro reduces the natriuretic activity of the factor. Specifically, inactivation was associated with a white cell/platelet fraction, indicating that these blood elements may play a physiological role in the metabolism of this new putative hormone.

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