The role of corticosterone in corticotrophin (ACTH)-induced hypertension in the rat.

Abstract:

OBJECTIVE:Corticotrophin (ACTH)-induced hypertension in the rat is prevented by L- but not D-arginine. We examined the effects of exogenous corticosterone in the male Sprague Dawley (SD) rat to determine whether ACTH-induced hypertension is mediated by corticosterone. METHODS:Exogenous corticosterone (10, 20 or 40 mg/kg per day) or sham (polyethylene glycol (PEG) 1 ml/kg per day) was injected subcutaneously in divided doses (s/c b.d.) over 15 treatment days to 40 SD rats (n = 10 each group). Subsequently, the effects of L-arginine, D-arginine or L-arginine + N-nitro-L-arginine (NOLA) on corticosterone-induced hypertension (corticosterone 20 mg/kg per day) were examined. Systolic blood pressure (SBP) and metabolic parameters were measured every two days. RESULTS:Twenty and 40 mg/kg per day of corticosterone increased SBP compared with sham (P< 0.01, P< 0.05 respectively, sham versus respective group). Forty mg/kg per day of corticosterone raised serum corticosterone concentration compared with sham (502 +/- 20 versus 364 +/- 25 ng/ml, P < 0.001). L-arginine prevented the rise in SBP produced by corticosterone (131 +/- 3 to 131 +/- 2 mmHg, control versus day 10) but D-arginine did not (129 +/- 3 to 142 +/- 4 mmHg on day 8, P < 0.01). NOLA blocked the effect of L-arginine and amplified the rise in blood pressure produced by corticosterone (130 +/- 3 to 171 +/- 6 mmHg on day 10, P < 0.001). CONCLUSIONS:The haemodynamic features of ACTH-induced hypertension were reproduced by corticosterone excess, at concentrations of corticosterone similar to those in studies of exogenous ACTH administration. It is likely that ACTH-stimulated adrenal production of corticosterone accounts for the features of ACTH-induced hypertension in the rat

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Mangos GJ,Turner SW,Fraser TB,Whitworth JA

doi

10.1097/00004872-200018120-00020

subject

Has Abstract

pub_date

2000-12-01 00:00:00

pages

1849-55

issue

12

eissn

0263-6352

issn

1473-5598

journal_volume

18

pub_type

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