Abstract
Estrogen-induced morphologic differentiation of chick oviduct is accompanied by increases in the total endogenous mRNA activity of oviduct polysomes. Concomitant increases are also noted in ribosome translational capacity and activity of peptide chain initiation factors. Once the differentiation process nears completion (about 7 days of estrogen administration), total ribosomebound mRNA activity decreases, but the translational machinery remains very active. In addition, estrogen induces the accumulation of ovalbumin mRNA before ovalbumin is demonstrable in the oviduct. The data suggest that the rate-limiting event in the hormonal induction of cell-specific proteins, such as ovalbumin, is the synthesis and intracellular accumulation of specific mRNA for such proteins.
Keywords: ovalbumin, morphological changes, protein synthesis, ribosome, chick
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