[Effects of glial cell-derived neurotrophic factor on SCF protein and antioxidant enzyme activity in the testis of unilateral cryptorchidism rats].
OBJECTIVE
To explore the effects of glial cell-derived neurotrophic factor (GDNF) on the stem cell factor (SCF), superoxide dismutase (SOD), catalase (CAT) and malondialdehyde (MDA) in the undescended testis tissue of rats.


METHODS
Models of left cryptorchidism were made in 48 healthy male rats weighing (200 +/- 20) g and randomly divided into four groups: model control, GDNF 7 d, GDNF 14 d and GDNF 21 d. The rats in the latter three groups were killed at 7, 14 and 21 days after intravenous injection of GDNF, their left testes harvested for measurement of the activities of SOD and CAT and the content of MDA. The apoptosis index of spermatogenic cells was detected by TUNEL, the histological changes of the testis tissue observed under the light microscope, and the gene and protein expressions of SCF determined by real-time quantitative PCR and Western blotting, respectively.


RESULTS
The apoptosis indexes of spermatogenic cells were obviously decreased in the GDNF 7 d, GDNF 14 d and GDNF 21 d groups (8.42 +/- 0.16, 4.45 +/- 0.34 and 7.32 +/- 0.09) as compared with that of the model control (13.5 +/- 0.64), with statistically significant difference between the GDNF 14 d and control groups (P < 0.01). The SCF expression and SOD activity were remarkably increased while the MDA content markedly reduced in the GDNF groups in comparison with those in the model control (P < 0.01).


CONCLUSIONS
GDNF had a protective effect on the spermatogenic function of rat testes with unilateral cryptorchidism. It could enhance the antioxidant enzyme activity of the antioxidant enzyme system, elevate the expression of SCF and thus improve the testicular reproductivity, which were best indicated in the GDNF 14 d group.
Department of Pediatric Surgery, Yishui Central Hospital of Linyi City, Yishui, Shandong 276400, China.
Sheng-Hua
SH
Qiu
Hui-Yi
HY
Zhuang
Hua-Feng
HF
Zhang
Chang-Ling
CL
Li
D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D002374:Catalase / Q000378:metabolism; D003456:Cryptorchidism / Q000378:metabolism*; D051100:Glial Cell Line-Derived Neurotrophic Factor / Q000378:metabolism*; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D019089:Stem Cell Factor / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000378:metabolism; D013737:Testis / Q000378:metabolism
D000975:Antioxidants; D051100:Glial Cell Line-Derived Neurotrophic Factor; D019089:Stem Cell Factor; D008315:Malondialdehyde; D002374:Catalase; D013482:Superoxide Dismutase