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Effect of continuous low-dose gamma-irradiation on rat Sertoli cell function
P Kamtchouing1, G Pinon-Lataillade, V Papadopoulos
1Laboratoire de Biochimie, UA CNRS 609, CHU Côte de Nâcre, Caen, France.
Reproduction, Nutrition, Developpement
|January 1, 1988
Summary
Continuous low-dose gamma irradiation damages rat germ cells, increasing FSH. Sertoli cell function declines, impacting androgen binding protein and transferrin, suggesting germ cell involvement in regulating these factors.
Area of Science:
- Reproductive biology
- Radiation toxicology
- Cellular endocrinology
Background:
- Continuous low-dose gamma irradiation is known to affect reproductive health.
- Germ cell degeneration is a primary concern in radiation exposure.
- Sertoli cells play a crucial role in spermatogenesis and regulating the testicular environment.
Purpose of the Study:
- To investigate the effects of continuous low-dose gamma irradiation on germ cells and Sertoli cell function in mature rats.
- To assess changes in hormone levels (FSH, LH, testosterone) and key proteins (ABP, transferrin) following irradiation.
- To explore the role of germ cells in regulating Sertoli cell paracrine factors and Leydig cell function.
Main Methods:
- Mature rats were subjected to continuous low-dose gamma irradiation for 55, 70, and 85 days.
- Blood and epididymal samples were collected to measure FSH, LH, testosterone, and androgen binding protein (ABP) levels.
- Sertoli cell function was assessed by measuring transferrin secretion.
- Leydig cell function was evaluated by measuring LH-stimulated intracellular cAMP and testosterone output in the presence of seminiferous tubule medium (STM) from control and irradiated rats.
Main Results:
- Irradiation induced progressive germ cell degeneration and increased blood FSH levels, while LH and testosterone remained unchanged.
- Sertoli cell function was impaired from 70 days, evidenced by decreased ABP and transferrin secretions (35-40%).
- Epididymal ABP content decreased (34-60%), though serum ABP was unaltered. Leydig cell function showed altered responses to STM from treated rats, impacting cAMP and testosterone synthesis, with effects diminishing by 85 days.
Conclusions:
- Continuous low-dose gamma irradiation likely alters Sertoli cell function in rats.
- Germ cells appear to play a regulatory role in the synthesis of ABP, transferrin, and Sertoli cell paracrine factors.
- The study highlights the complex interplay between germ cells, Sertoli cells, and Leydig cells under chronic radiation exposure.