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Antihypertensive effect of low ethanol intake in spontaneously hypertensive rats

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Abstract

Light to moderate drinking in humans lowers the risk of coronary heart disease and may lower blood pressure. We examined the effect of chronic low daily alcohol consumption on blood pressure, platelet cytosolic free calcium [Ca2+]i, tissue aldehyde conjugates and renal vascular changes in normotensive Wistar-Kyoto (WKY) and spontaneously hypertensive rats (SHR). We also examined the effects of the same weekly amount of alcohol consumption over a one day period each week simulating weekend drinking in humans. Animals, age 7 weeks, were divided into six groups of six animals each and were treated as follows: WKY and SHR control, normal drinking water; WKY and SHR, 0.5% ethanol in drinking water; WKY and SHR, 3.5% ethanol in drinking water one day/week. After 14 weeks systolic blood pressure, platelet [Ca2+]i, liver, kidney and aortic aldehyde conjugates were significantly higher (p < 0.05) in untreated SHRs as compared to untreated WKYs. Daily 0.5% ethanol consumption in SHRs significantly (p < 0.05) attenuated these changes and also attenuated smooth muscle cell hyperplasia and narrowing of the lumen in small arteries and arterioles of the kidney. WKY rats treated with 0.5% ethanol had lower aldehyde conjugates without any significant effect on blood pressure and platelet [Ca2+]i as compared to WKY controls. Consumption of 3.5% ethanol one day/week did not affect blood pressure and associated changes in normotensive WKY rats or hypertensive SHRs as compared to their respective controls. These results suggest that chronic daily low ethanol intake lowers blood pressure in SHRs by lowering tissue aldehyde conjugates and cytosolic free calcium.

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Authors and Affiliations

  1. Faculty of Medicine, Laboratory Medicine, and Community Medicine, The Health Sciences Centre, S. A. Grace General Hospital, and Memorial University of Newfoundland, St. John's, Newfoundland, Canada, A1B 3V6

    Sudesh Vasdev, Carol Ann Ford, Linda Longerich, Sushil Parai & Veeresh Gadag

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  1. Sudesh Vasdev
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  2. Carol Ann Ford
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  3. Linda Longerich
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  4. Sushil Parai
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  5. Veeresh Gadag
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Vasdev, S., Ford, C.A., Longerich, L. et al. Antihypertensive effect of low ethanol intake in spontaneously hypertensive rats. Mol Cell Biochem 200, 85–92 (1999). https://doi.org/10.1023/A:1006950414560

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