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Effects of metyrapone infusion on corticotropin-releasing factor and arginine vasopressin secretion into the hypophysial portal blood of conscious, unrestrained rams.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Conte-Devolx, Bernard Guillaume, Viviane Boudouresque, Françoise Graziani, Noël Magnan, Emília Dos Santos Grino, Michel Emperaire, Nicole Nahoul, K. Cataldi, Marielda Oliver, C. G. M. |
| Copyright Year | 1992 |
| Abstract | The effects of rapid changes of circulating cortisol levels on ACTH secretion and on corticotropin-releasing factor (CRF) and arginine vasopressin (AVP) concentrations into hypophysial portal blood were studied in six adult rams. Pharmacological adrenalectomy was obtained by 3 h metyrapone infusion (100 mg.kg-1.h-1). Blockade of cortisol synthesis induced a tenfold increase of plasma ACTH levels accompanied by a moderate increase of CRF secretion (150% vs preinjection levels) and a large increment of AVP secretion (535% vs preinjection levels). ACTH levels remained high during the 3 h following the end of metyrapone infusion. During the same period, CRF secretion was still elevated (231% vs preinjection levels), while AVP secretion was further stimulated (2,151% vs preinjection levels). Subsequent hydrocortisone infusion (66 micrograms.kg-1.h-1) for 2 h induced a rapid decrease of both ACTH and AVP secretion, while CRF levels in hypophysial portal blood still remained elevated. These data suggest that changes in ACTH secretion induced by acute modifications of the negative glucocorticoid feedback are, in addition to the well documented direct effect of cortisol on the corticotropes, mainly mediated by variations of hypothalamic AVP secretion. |
| Starting Page | 090403 |
| Ending Page | 090403 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://eje.bioscientifica.com/downloadpdf/journals/eje/127/5/acta_127_5_010.pdf |
| PubMed reference number | 1471455v1 |
| Volume Number | 127 |
| Issue Number | 5 |
| Journal | Acta endocrinologica |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Argipressin Corticotropin-Releasing Hormone Hydrocortisone Increment Kidney Failure, Chronic Metyrapone Pharmacology Tritium corticotropin secretion cortisol biosynthetic process vasopressin secretion |
| Content Type | Text |
| Resource Type | Article |
