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Endocrinology, Vol 128, 226-230, Copyright © 1991 by Endocrine Society

ARTICLES

Antiserum against homologous atrial natriuretic peptide diminishes the natriuretic response during mineralocorticoid escape in rats

ZP Zeng, M Naruse, K Naruse, Y Kato, YF Shi, H Demura and K Shizume
Department of Medicine, Tokyo Women's Medical College, Japan.

To elucidate the physiological role of atrial natriuretic peptide (ANP) in plasma during mineralocorticoid escape, we investigated the effects of passive immunization with ANP-specific antiserum on deoxycorticosterone (DOCA)-treated rats. Sodium was retained in excess of intake during the first day after treatment with DOCA, and sodium balance returned to control values by the second day, whereas the excretion of potassium exceeded the intake during all days after DOCA treatment. These changes in electrolyte balance were associated with a significant increase in plasma levels of ANP. Administration of ANP- specific antiserum significantly impaired the return to normal sodium balance as well as the augmented kaliuresis that were observed on the second day after injection of DOCA. No significant effect was observed on either sodium or potassium balance after the injection of normal rabbit serum. These results suggest that plasma ANP plays an important role in mineralocorticoid escape.


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