Dissociation of hyperreninemia and renal prostaglandin synthesis in the adrenalectomized rat

Leslie D. Boucher, Theodore A. Kotchen, Brian A. Jackson

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The aim of this study was to determine whether hyperreninemia in the adrenalectomized (ADX) rat is dependent on renal prostaglandin synthesis, as has been suggested for two other hyperreninemic conditions, Bartter's syndrome and chronic liver disease. Plasma renin concentration (PRC) in anesthetized, ADX rats was significantly increased (Δ +480%; p < 0.001) compared to sham-operated controls. In vivo, indomethacin (10 mg/kg i.v.) significantly reduced PRC of anesthetized, ADX rats after both 45 min (Δ -34%; p < 0.05) and 90 min (Δ -47%; p < 0.05). In vitro renin release from renal cortical slices of ADX rats was also significantly greater (Δ +130%; p < 0.05) than from sham-operated control cortical slices. Renin release from cortical slices of ADX rats given dexamethasone (10 μg/kg/day) for 4 days prior to sacrifice did not differ from sham-operated control values. Prostaglandin E2 (PGE2) release from cortical slices of ADX rats did not differ significantly from controls. However, PGE2 synthesis in glomeruli microdissected from ADX rats was significantly increased (Δ +110%; p < 0.001) compared to controls. PGE2 synthesis in glomeruli of dexamethasone-treated ADX rats remained significantly elevated compared to controls. Ibuprofen (10-6 M) decreased PGE2 synthesis in cortical slices by 80%. However, prostaglandin synthesis inhibition had no effect on renin release from either ADX or control renal cortical slices. These results suggest that despite increased glomerular synthesis, prostaglandins do not directly influence renin release in the ADX rat.

Original languageEnglish
Pages (from-to)143-155
Number of pages13
JournalProstaglandins
Volume31
Issue number1
DOIs
StatePublished - Jan 1986

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology

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