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- W1964596317 abstract "Cellular retinol binding protein 1 (CRBP1) is the cytosolic carrier for retinol. It is expressed in many tissues, but the concentrations vary considerably. In Sertoli cells from immature rat testis, CRBP1 is highly expressed. The results of the present study show that regulation of CRBP1 expression at the protein level appears to be independent of regulation at the mRNA level. In Sertoli cells from prepubertal 19-day-old rats, CRBP1 mRNA is strongly induced for up to 72 h by the presence of serum factors. In contrast, treatment of the cells with cAMP analogues led to a rapid reduction in mRNA to quantities less than 5% of control values. However, the changes in CRBP1 mRNA did not lead to similar changes in the concentration of CRBP1 protein during 72 h of observation. Similarly, treatment of cells from 32- and 44-day-old rats with serum led to increased CRBP1 mRNA, whereas cAMP treatment resulted in a decrease in CRBP1 mRNA. Again, no changes were observed in the concentration of CRBP1 protein. Furthermore, co-incubation of Sertoli cells from 19-day-old rats with purified pachytene spermatocytes or round spermatids resulted in an increase in mRNA for CRBP1. However, comparable changes in CRBP1 protein concentrations were not observed. Neither cAMP nor serum changed the fraction of CRBP1 mRNA that was associated with polysomes. As a possible explanation for some of the results, pulse-chase experiments showed that the rate of CRBP1 degradation in cultured Sertoli cells is decreased by cAMP. It is proposed that these changes at the level of protein turnover contribute to the maintenance of stable concentrations of CRBP1 even when the corresponding mRNA concentrations vary markedly." @default.
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- W1964596317 date "2000-05-01" @default.
- W1964596317 modified "2023-09-26" @default.
- W1964596317 title "Evidence for independent control at the mRNA and protein levels of cellular retinol binding protein 1 in rat Sertoli cells" @default.
- W1964596317 cites W1970096907 @default.
- W1964596317 doi "https://doi.org/10.1530/jrf.0.1190101" @default.
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