Effects of high dose olive leaf extract on haemodynamic and oxidative stress parameters in normotensive and spontaneously hypertensive rats

Autor: Dekanski Dragana, Mihailović-Stanojević Nevena, Milanović Grujić Jelica, Jovović Đurđica, Miloradović Zoran
Jazyk: angličtina
Rok vydání: 2014
Předmět:
Zdroj: Journal of the Serbian Chemical Society, Vol 79, Iss 9, Pp 1085-1097 (2014)
Druh dokumentu: article
ISSN: 0352-5139
1820-7421
14021803
DOI: 10.2298/JSC140218030D
Popis: Antihypertensive activity of natural antioxidant, olive leaf extract (OLE) is known, but its influence on cardiovascular system when administered in a high dose has not been investigated yet. Our aim was to determine the acute effects of excessive intake of standardized OLE on blood pressure, heart rate and oxidative status in both spontaneously hypertensive rats and normotensive Wistar rats. Systolic arterial pressure and heart rate were measured using a tail-cuff, pneumatic pulse detector, before, 60 and 120 minutes after intragastric OLE administration. Activities of catalase, glutathione peroxidase, superoxide dismutase (SOD) and glutathione reductase in erythrocytes, as well as lipid peroxidation in plasma (pTBARS) were measured at the same time points, spectrophotometrically. High-dose OLE did not influence blood pressure, heart rate and pTBARS in normotensive rats, while SOD, catalase, and glutathione reductase activities significantly increased. The same dose significantly decreased blood pressure in hypertensive rats, but increased pTBARS and SOD activity. Excessive oral intake of OLE induced moderate hypotensive effects in spontaneously hypertensive rats only, suggesting absence of harmful haemodynamic effects after oral overdose in both rats strain. However, its prooxidative role when given in high dose in hypertensive organism should not be neglected. [Projekat Ministarstva nauke Republike Srbije, br. 175096]
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