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|Title:||Effect of increased calcium intake on cardiac and vascular Na<sup>+ </sup>- K<sup>+ </sup>- ATPase activity in oral contraceptive-treated female <i style="">Sprague-Dawley</i> rats|
|Authors:||Olatunji, L A|
Soladoye, A O
|Abstract:||The present study aimed at investigating the influence of increased dietary calcium on Na<sup>+</sup>-K<sup>+</sup>-ATPase activity in heart and aorta of female <i style="">Sprague-Dawley</i> rats treated with oral contraceptive (OC) steroids. Rats were grouped as control (CR), OC-treated and OC+calcium-treated. OC-treated and OC+calcium-treated received a combination of OC steriods (ethinyloestradiol and norgestrel; ig). OC+calcium-treated rats were fed with 2.5% calcium diet, while OC-treated and CR groups were fed on 0.9% calcium diet. The activity of Na<sup>+</sup>-K<sup>+</sup>-ATPase in heart and aorta was significantly lower in OC-treated rats than those in the other groups. OC treatment caused significant increase in plasma glucose and significant decrease in plasma K<sup>+</sup> as compared to control group. Decrease in Na<sup>+</sup>-K<sup>+</sup>-ATPase activity and plasma K<sup>+ </sup>was abrogated by increased calcium intake, while increase in plasma glucose was not normalized by calcium supplementation. Plasma levels of Na<sup>+</sup>, lipid peroxidation index and ascorbic acid were comparable among the three groups. These results showed that OC treatment could lead to impaired activity of cardiac and vascular Na<sup>+</sup>-K<sup>+</sup>-ATPase, possibly due to reduced plasma K<sup>+ </sup>level and these effects could be abolished by high calcium diet.<b style=""></b>|
|ISSN:||0975-1009 (Online); 0019-5189 (Print)|
|Appears in Collections:||IJEB Vol.44(11) [November 2006]|
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