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Changes in the Expression Pattern of Cyclooxygenase-2, Mapkinases and Related Apoptotic Markers by Different Levels of Estrogen Supplementation in Mature or Ovariectomized Female Rat Heart  

Shin Jang In (한남대학교 식품영양학과)
Park Ock Jin (한남대학교 식품영양학과)
Publication Information
Journal of Nutrition and Health / v.38, no.1, 2005 , pp. 30-39 More about this Journal
Abstract
The effects of different concentrations of estrogen supplementation to mature female rats or estrogen supplementation to ovariectomized rats on cyclooxygenase-2 (COX-2) expression, PGE$_2$ production and mapkinases expression were investigated in experimentally induced atherogenic rats with feeding a high fat. high cholesterol diet. In the first experiment using 48-week old mature rats, the supplementation of three different levels of estrogen was compared to the basal diet. The high concentration of estrogen supplementation induced the marked up-regulation of COX-2 protein and the increase in plasma PGE$_2$ production and this seems to be followed by the up-regulation of p38 among mapkinases. The regulation of bax showed in a reverse trend of COX-2 in heart tissues of mature female rats. In the second ex-perimental system, female Sprague-Dawley rats were bilaterally ovariectomized; sham-operated animals were used as controls. Three weeks later, the animals were supplied with basal diet to sham-operated control group and ovariectomized control group, and estrogen supplemented diet to ovariectomized group for an eight-week experimental period. In a group supplemented with a medium dose of estrogen, COX-2 expression was up-regulated. This up-regulation was accompanied by the elevated expression of pERK1/2. Bax was increased in estrogen-fed animals indicating bax might be involved in estrogen feeding state in ovariectomized rats. Further investigations on the relationship between COX-2 and biological activities such as vasodilation by estrogen are required in in vivo system of female rats at the various physiological states.
Keywords
estrogen supplementation; ovariectomized rats; cylcooxygenase-2 expression; $PGE_2$ concentration;
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