Lack of prostaglandin effect on sodium balance and hyperreninemia in adrenalectomized rats
| Autor: | Gerald S. Kidd, T.P. O'Barr, J.A. Merenich, Robert J. Sjoberg |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Male
medicine.medical_specialty medicine.medical_treatment Indomethacin Prostaglandin Prostacyclin Biochemistry Dexamethasone Dinoprostone Natriuresis Primary Adrenal Insufficiency Rats Sprague-Dawley chemistry.chemical_compound Endocrinology Internal medicine Renin–angiotensin system Adrenal Glands Renin medicine Animals Homeostasis Prostaglandin E2 Aspirin Adrenalectomy Sodium Epoprostenol Rats chemistry Prostaglandin inhibitor Prostaglandins lipids (amino acids peptides and proteins) medicine.drug |
| Zdroj: | Prostaglandins. 44(2) |
| ISSN: | 0090-6980 |
| Popis: | Glucocorticoids are known inhibitors of prostaglandin production. Prostaglandin E2 (PGE2) and prostacyclin (PGI2) are promoters of natriuresis and renin release. Excessive prostaglandin production, therefore, might contribute to the altered sodium balance and renin release observed in primary adrenal insufficiency. To test this hypothesis, sodium balance and prostaglandin production were measured in adrenalectomized rats and in animals receiving prostaglandin inhibitors or replacement dexamethasone. Compared to sham-operated controls, adrenalectomized rats had decreased two-day sodium balance and elevated plasma renin concentration (PRC), renal PGE2 production, and renal 6-ketoprostaglandin F1 alpha (6kPGF1 alpha, the nonenzymatic metabolite of PGI2); however, no appreciable change in aortic 6kPGF1 alpha production was observed. Dexamethasone given to adrenalectomized rats normalized PRC but had no effect on sodium balance or prostaglandin production. Likewise, prostaglandin inhibitors did not alter the sodium balance or decrease the PRC post adrenalectomy. These data confirm renal prostaglandin production is increased in adrenalectomized rats, but suggest that the elevation is not due directly to glucocorticoid deficiency. Further, PRC levels in adrenal insufficiency do not appear to be prostaglandin mediated. In conclusion, excessive renal prostaglandin production does not contribute to altered sodium balance or increased PRC in adrenalectomized rats. |
| Databáze: | OpenAIRE |
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