Posted by Chantel M. research contributed by US National Library of Medicine
National Institutes of Health
Although soy
foods have been recognized as an excellent source of protein, there have
been recent concerns regarding potential adverse effects of isoflavone
phytochemicals found in soy products,
which are known to bind and activate estrogen receptors. In the study of
global hepatic gene expression profiles in ovariectomized female
Sprague-Dawley rats treated with 17beta-estradiol (E(2)) or fed with soy
protein isolate (SPI) as a means of estimating potential estrogenicity
of SPI. Female Sprague-Dawley rats were fed AIN-93G diets containing
casein (CAS) or SPI starting at postnatal day (PND) 30. Rats were
ovariectomized on PND 50 and infused with E(2) or vehicle in osmotic
pumps for 14 d, posted in PubMed, researchers indicated that Serum E(2) levels were within normal ranges for the rat and SPI feeding
did not increase uterine wet weight in the absence or presence of E(2).
SPI feeding altered (P<0 data-blogger-escaped-.05="">or=+/-1.5-fold) the expression of 82
genes, while E(2) treatment altered 892 genes. Moreover, only 4% of
E(2)-affected genes were also modulated by SPI, including some whose
expression was reversed by SPI feeding.
Chinese Secrets to Fatty Liver and Obesity
Reversal
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