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Retinol binding protein in rat testicular cells
Journal of Reproduction and Fertility
|March 1, 1981
Summary
Cellular retinol-binding protein (CRBP) is present in rat Sertoli and peritubular cells, but not in mature sperm cells. Hormone treatment increases CRBP activity in Sertoli cells, suggesting a role in testicular function.
Area of Science:
- Reproductive Biology
- Cellular Biology
- Biochemistry
Background:
- Cellular retinol-binding protein (CRBP) plays a crucial role in retinoid metabolism and transport.
- Understanding CRBP distribution and regulation in the testis is vital for comprehending male reproductive health.
Purpose of the Study:
- To investigate the presence and localization of CRBP in rat testicular cells.
- To examine the effect of follicle-stimulating hormone (FSH) and testosterone on CRBP activity in Sertoli cells.
Main Methods:
- Primary cultures of rat Sertoli and peritubular cells were established.
- CRBP levels were assessed in cytosols of cultured cells and testicular homogenates.
- Specific activity of CRBP was measured in FSH- or FSH + testosterone-treated Sertoli cell cultures.
Main Results:
- CRBP was detected in the cytosols of cultured Sertoli and peritubular cells from 20-day-old rats.
- CRBP was not found in spermatids or spermatocytes from 60-day-old rats.
- Sertoli and peritubular cells showed a 5-fold enrichment of CRBP compared to whole testis.
- FSH or FSH + testosterone treatment increased CRBP specific activity by 60% in Sertoli cells.
Conclusions:
- CRBP is localized in Sertoli and peritubular cells of the rat testis.
- CRBP expression is stage-specific, decreasing with germ cell maturation.
- Hormonal stimulation (FSH and testosterone) enhances CRBP activity in Sertoli cells, indicating its potential role in testicular function and retinoid signaling.