摘要
Objectives: To analyze the expression and significance of glial cell derived neurotrophic factor (GDNF) in the recovery of spermato genesis in mice. Methods: Adult Kunming mice were injected in traperitoneally with 2 doses of busulfan (10 mg/kg) 24 days apart so as to establish the spermatogenesis recovery modei. Testes were harvested at weeks l, 2, 3,4, 6, 8 and 10 after the second injection. Eight normai mice served as the controls. Recovery of spermatoge nesis was observed by light and electron microscopy and the GDNF mRNA measured by semi-quantitative RT-PCR and in situ hybridization. Results: After the second injection the expression of GDNF mRNA was increased significantly at week l and reached its peak at week 2. It was then decreased significantly at week 3 and reached its valley at week 4. After that it was increased gradu ally and recovered at week 10. GDNF mRNA was mainly ex pressed by the Sertoli celis. Conclusion: In the course of recovery of spermatogenesis, a high Ievel of GDNF expression plays a key role in the promotion of self-renewal and maintenance of the num ber of spermatogonial stem celis.
Objectives: To analyze the expression and significance of glial cell derived neurotrophic factor (GDNF) in the recovery of spermato genesis in mice. Methods: Adult Kunming mice were injected in traperitoneally with 2 doses of busulfan (10 mg/kg) 24 days apart so as to establish the spermatogenesis recovery modei. Testes were harvested at weeks l, 2, 3,4, 6, 8 and 10 after the second injection. Eight normai mice served as the controls. Recovery of spermatoge nesis was observed by light and electron microscopy and the GDNF mRNA measured by semi-quantitative RT-PCR and in situ hybridization. Results: After the second injection the expression of GDNF mRNA was increased significantly at week l and reached its peak at week 2. It was then decreased significantly at week 3 and reached its valley at week 4. After that it was increased gradu ally and recovered at week 10. GDNF mRNA was mainly ex pressed by the Sertoli celis. Conclusion: In the course of recovery of spermatogenesis, a high Ievel of GDNF expression plays a key role in the promotion of self-renewal and maintenance of the num ber of spermatogonial stem celis.
