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Fructose-Rich Diet-Induced Changes in the Expression of the Renin Angiotensin System Molecules in the Heart of Ovariectomized Female Rats Could be Reversed by Estradiol

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Authors
Bundalo, Maja M.
Živković, Maja
Tepavčević, Snežana
Ćulafić, Tijana
Korićanac, Goran
Stanković, Aleksandra
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Abstract
The renin-angiotensin system has been implicated in the development of metabolic syndrome and appears to be a key in the local tissue control of normal cardiac functions. Physiological concentrations of estrogens have been shown to be cardioprotective, especially against the damaging effects of fructose-rich diet. The aim of the study was to investigate the expression of the renin-angiotensin system molecules with potentially deleterious effect on the heart (angiotensin-converting enzyme and angiotensin II type 1 receptor) and those with potentially protective effects, (angiotensin-converting enzyme 2 and angiotensin II type 2 receptor), in ovariectomized fructose fed female rats with 17-estradiol replacement. Real-time PCR and Western blot analysis were used for quantification of gene and protein expression in the heart. Fructose diet increased the expression of angiotensin-converting enzyme and angiotensin II type 1 receptor and decreased the expression of angiotensin-converting enzy...me 2 and angiotensin II type 2 receptor. On the other hand, estradiol replacement seems to undo fructose diet effects on cardiac renin-angiotensin system. Downregulation of angiotensin-converting enzyme and angiotensin II type 1 receptor, and reversion of expression of both potentially protective molecules, angiotensin-converting enzyme 2 and angiotensin II type 2 receptor, to the control level in cardiac tissue took place. Obtained results suggest that estradiol may reverse the harmful effect of fructose-rich diet on the expression of renin-angiotensin system molecules. These findings may also be important in further research of phenotypes like insulin resistance, metabolic syndrome, and following cardiovascular pathology in females.

Keywords:
metabolic syndrome / ovariectomy / angiotensin converting enzyme / angiotensin converting enzyme 2 / angiotensin II type 1 receptor / angiotensin II type 2 receptor
Source:
Hormone and Metabolic Research, 2015, 47, 7, 521-527
Projects:
  • Genetic basis of human vascular and inflammatory diseases (RS-175085)
  • Role of steroid hormones in neuroendocrine adaptation to stress and pathophysiology of metabolic syndrome - molecular mechanisms and clinical implications (RS-41009)

DOI: 10.1055/s-0034-1394373

ISSN: 0018-5043 (print); 1439-4286 (electronic)

PubMed: 25369074

WoS: 000355332200009

Scopus: 2-s2.0-84946240884
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URI
http://vinar.vin.bg.ac.rs/handle/123456789/570
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Vinča

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