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. 1986 Dec 1;240(2):461–469. doi: 10.1042/bj2400461

Degradation of atrial natriuretic factor in the rat.

K K Murthy, G Thibault, R Garcia, J Gutkowska, J Genest, M Cantin
PMCID: PMC1147439  PMID: 2949739

Abstract

The biologically active circulating form of atrial natriuretic factor (ANF) in the rat is the 28-amino-acid peptide ANF-(Ser-99-Tyr-126). Degradation of this peptide in vivo as well as in vitro, in whole blood, in plasma and by the isolated mesenteric artery was investigated. Studies in vivo in the rat demonstrated that the elimination and degradation of ANF was extremely fast: within 3 min more than 95% of the injected immunoreactive material was eliminated from circulation. The production of a short C-terminal peptide was detected on injection of 125I-ANF-(Ser-99-Tyr-126) into the rat. This peptide increased proportionately with incubation time. Experiments in vitro in the presence of whole blood or plasma did not cause any major destruction of ANF even after incubation for 60 min. After this prolonged incubation in plasma, ANF-(Ser-99-Tyr-126) was partially converted into ANF-(Ser-103-Tyr-126), a less potent peptide. Isolated mesenteric-artery preparation appeared to degrade ANF in a manner very similar to the system in vivo. These results suggest that degradation of ANF may occur either after internalization in the vascular cells or by a membrane-bound enzyme in the vasculature.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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