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• W2156849215 abstract "Vitamin A is a key micronutrient required during crucial stages of embryonic development and vitamin A deficiency (VAD) results in embryonic heart malformation. The pleiotropic functions of vitamin A are mediated by specific nuclear receptors: the retinoic acid receptors (RARα, -β, and -γ) and the retinoic X receptors (RXRα, -β, and -γ). The action of nuclear receptors has been implicated in controlling of cell proliferation, differentiation and apoptosis, and the expressions of these receptor genes are regulated by retinoic acid levels during the early stages of embryonic development. GATA-4 is one of the earliest transcription factors expressed in developing cardiac cells. However, the functional links of specific nuclear receptors to heart development in VAD embryos are not clearly understood. In our study, weaning female Sprague-Dawley rats were fed a modified diet containing different concentrations of vitamin A according to the American Institute of Nutrition 93 Growth Purified Diet. After 10-wk feeding, the female rats were mated with normal male rats, and a portion of them were transferred to a diet with enough added vitamin A for the pregnancy cycle. The embryo hearts were dissected out at embryonic day 13.5 (E13.5) to study the expression of RARs, RXRs and GATA-4. The embryo hearts from E18.5 were for observation of ultrastructural changes. In comparison to vitamin A supplemented groups, the embryo hearts from vitamin A insufficient groups exhibited ultrastructural changes and significantly lower expression of GATA-4, RARα, and -γ, and higher expression of RXRα and -β. Our findings suggest that the down-regulation of RARs and the up-regulation of RXRs resulted from VAD affected GATA-4 gene expression, which resulted in ultrastructural changes in embryo hearts due to maternal insufficiency of vitamin A during pregnancy." @default.
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• W2156849215 date "2012-01-01" @default.
• W2156849215 modified "2023-10-16" @default.
• W2156849215 title "Ectopic Expression of Retinoic Acid Receptors and Change of Myocardial Structure in the Offspring Heart with Vitamin A Deficiency" @default.
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• W2156849215 doi "https://doi.org/10.3177/jnsv.58.309" @default.
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