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2016 ; 60
(ä): 30985
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Relaxin and atrial natriuretic peptide pathways participate in the anti-fibrotic
effect of a melon concentrate in spontaneously hypertensive rats
#MMPMID27079780
Carillon J
; Gauthier A
; Barial S
; Tournier M
; Gayrard N
; Lajoix AD
; Jover B
Food Nutr Res
2016[]; 60
(ä): 30985
PMID27079780
show ga
BACKGROUND: In spontaneously hypertensive rats (SHR), a model of human essential
hypertension, oxidative stress is involved in the development of cardiac
hypertrophy and fibrosis associated with hypertension. Dietary supplementation
with agents exhibiting antioxidant properties could have a beneficial effect in
remodeling of the heart. We previously demonstrated a potent anti-hypertrophic
effect of a specific melon (Cucumis melo L.) concentrate with antioxidant
properties in spontaneously hypertensive rats. Relaxin and atrial natriuretic
peptide (ANP) were reported to reduce collagen deposition and fibrosis
progression in various experimental models. OBJECTIVE: The aim of the present
investigation was to test the hypothesis that, beside reduction in oxidative
stress, the melon concentrate may act through relaxin, its receptor
(relaxin/insulin-like family peptide receptor 1, RXFP1), and ANP in SHR. DESIGN
AND RESULTS: The melon concentrate, given orally during 4 days, reduced
cardiomyocyte size (by 25%) and totally reversed cardiac collagen content (Sirius
red staining) in SHR but not in their normotensive controls. Treatment with the
melon concentrate lowered cardiac nitrotyrosine-stained area (by 45%) and
increased by 17-19% the cardiac expression (Western blot) of superoxide dismutase
(SOD) and glutathione peroxidase. In addition, plasma relaxin concentration was
normalized while cardiac relaxin (Western blot) was lowered in treated SHR.
Cardiac relaxin receptor level determined by immunohistochemical analysis
increased only in treated SHR. Similarly, the melon concentrate reversed the
reduction of plasma ANP concentration and lowered its cardiac expression.
CONCLUSIONS: The present results demonstrate that reversal of cardiac fibrosis by
the melon concentrate involves antioxidant defenses, as well as relaxin and ANP
pathways restoration. It is suggested that dietary SOD supplementation could be a
useful additional strategy against cardiac hypertrophy and fibrosis.