Fetuin is a serum protein widely distributed in the animal kingdom and found in all mammalian species so far investigated. It is mainly a fetal protein, in the sense that the highest concentrations are found in serum and body fluids of embryos and fetuses. In order to elucidate possible biological functions of fetuin, we have studied its synthesis and distribution during the prenatal development of the rat with immunohistochemistry and in situ hybridization. We have isolated fetuin from rat serum and produced an antibody against this protein. In situ hybridization was performed using a 375-nucleotides-long digoxigenin-labeled riboprobe. Fetuin was unevenly distributed in all organ systems during development, with the most pronounced expression at E 10Fetuin is a serum protein widely distributed in the animal kingdom and found in all mammalian species so far investigated. It is mainly a fetal protein, in the sense that the highest concentrations are found in serum and body fluids of embryos and fetuses. In order to elucidate Barbour Ireland possible biological barbour Ireland Stockists functions barbour Dublin of fetuin, we have studied its synthesis and distribution during the prenatal development of the rat with immunohistochemistry and in situ hybridization. We have isolated fetuin from rat serum and produced an antibody against this protein. In situ hybridization was performed using a 375-nucleotides-long digoxigenin-labeled riboprobe. Fetuin was unevenly distributed in all organ systems during development, with the most pronounced expression at E16-E18. Fetuin expression was present in germinal cell populations, e.g., in the basal layer in the skin, in the germinal cell populations in the barbour Jackets brain anlage and the gonads, and it was barbour Jackets Ireland heavily expressed in the fetal hemopoietic liver. Furthermore, fetuin was expressed in the gastrointestinal epithelium prior to the development of glands and crypts. Fetuin was widely distributed in mesenchymal derived tissues, e.g., bone and muscle. In the developing kidney fetuin was heavily expressed is both mesenchymal condensations and glomerular anlages. Thus, fetuin was located in cells or structures undergoing differentiation and transformation. As fetuin has been shown previously to interfere with hormone signaling of transforming growth factor-beta, insulin and hepatocyte-growth factor, fetuin might be involved in cell differentiation and tissue transformation during the initial histogenesis, i.e., the time period in which cellular phenotypic characteristics are established.

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