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2015 ; 10
(9
): e0138048
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Prolonged Subcutaneous Administration of Oxytocin Accelerates Angiotensin
II-Induced Hypertension and Renal Damage in Male Rats
#MMPMID26393919
Phie J
; Haleagrahara N
; Newton P
; Constantinoiu C
; Sarnyai Z
; Chilton L
; Kinobe R
PLoS One
2015[]; 10
(9
): e0138048
PMID26393919
show ga
Oxytocin and its receptor are synthesised in the heart and blood vessels but
effects of chronic activation of this peripheral oxytocinergic system on
cardiovascular function are not known. In acute studies, systemic administration
of low dose oxytocin exerted a protective, preconditioning effect in experimental
models of myocardial ischemia and infarction. In this study, we investigated the
effects of chronic administration of low dose oxytocin following angiotensin
II-induced hypertension, cardiac hypertrophy and renal damage. Angiotensin II (40
?g/Kg/h) only, oxytocin only (20 or 100 ng/Kg/h), or angiotensin II combined with
oxytocin (20 or 100 ng/Kg/h) were infused subcutaneously in adult male
Sprague-Dawley rats for 28 days. At day 7, oxytocin or angiotensin-II only did
not change hemodynamic parameters, but animals that received a combination of
oxytocin and angiotensin-II had significantly elevated systolic, diastolic and
mean arterial pressure compared to controls (P < 0.01). Hemodynamic changes were
accompanied by significant left ventricular cardiac hypertrophy and renal damage
at day 28 in animals treated with angiotensin II (P < 0.05) or both oxytocin and
angiotensin II, compared to controls (P < 0.01). Prolonged oxytocin
administration did not affect plasma concentrations of renin and atrial
natriuretic peptide, but was associated with the activation of calcium-dependent
protein phosphatase calcineurin, a canonical signalling mechanism in pressure
overload-induced cardiovascular disease. These data demonstrate that oxytocin
accelerated angiotensin-II induced hypertension and end-organ renal damage,
suggesting caution should be exercised in the chronic use of oxytocin in
individuals with hypertension.