Abstract:
:The injection of chlorpropamide into Brattleboro homozygous rats (di/di) has previously been shown to result in enhanced activation of renal medullary adenylate cyclase activity and increased renal medullary content of cAMP in response to 1-desamino-8-D-arginine vasopressin (dDAVP). In contrast, in vivo chlorpropamide did not alter GTP, guanylylimidodiphosphate, or fluoride-stimulated adenylate cyclase activities in these renal membranes. We have now found that the effect of in vivo chlorpropamide in enhancing dDVAP-stimulated adenylate cyclase activity involves lowering the Km for ATP. We have also found that dDAVP increases urinary prostaglandin E2 (PGE2) excretion, and treatment with chlorpropamide causes an even greater PGE2 response to dDAVP. In contrast, in vivo chlorpropamide treatment did not increase vascular responses to arginine vasopressin (AVP) in the perfused kidney preparation and, in fact, inhibited the AVP-induced decrease in the glomerular filtration rate. Chlorpropamide, therefore, enhances the renal responses to dDAVP in terms of the cAMP and PG systems, while not increasing responses to postreceptor stimuli of the adenylate cyclase system or vascular responses to AVP. These observations support the concept that in vivo chlorpropamide acts at the receptor of the vasopressin-sensitive part of the tubule to augment responsiveness to vasopressin. In addition, in vivo chlorpropamide may inhibit certain vascular responses to AVP.
journal_name
Endocrinologyjournal_title
Endocrinologyauthors
Moses AM,Fenner R,Schroeder ET,Coulson Rdoi
10.1210/endo-111-6-2025subject
Has Abstractpub_date
1982-12-01 00:00:00pages
2025-30issue
6eissn
0013-7227issn
1945-7170journal_volume
111pub_type
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