[Effect of sildenafil ciltrate on the sexual activities of male rats].

OBJECTIVE: To obtain related pharmacodynamic data for the clinical experiment by observing the sexual activities of male rats after using sildenafil ciltrate through stomach irrigation. METHODS: Forty male Sprague-Dawley rats were distributed into 4 groups with different dosages (control with distilled water, low dosage: 0.08%, medium dosage: 0.24% and high dosage: 0.72%). After the male Sprague-Dawlay rats were mated with their female counterparts in pairs, the latent period of chasing, the frequencies of chasing in 60 minutes, the latent period of intercourse and the frequencies of intercourse in 60 minutes were recorded. RESULTS: Compared with the control, the frequencies of chasing were significantly increased and the latent periods of chasing were significantly shortened in both high dosage and medium dosage groups after using sildenafil (P < 0.01); The frequencies of intercourse in 60 minutes were significantly increased and the latent periods of intercourse were significantly shortened in all the groups after the use of sildenafil. CONCLUSIONS: The sexual activities of male rats treated with sildenafil were significantly activated.

[An electron microscope observation for the abnormal ultrastructure of the connecting piece in human spermatozoa from infertile painters].

OBJECTIVES: To investigate possible abnormalities of the sperm neck in eight infertile painters observed by transmission electron microscope. METHODS: Spermatozoa from 8 infertile painters (21-32 years old) were observed by transmission electron microscope. RESULTS: The abnormalities of the connecting piece could be divided into 6 types, among which the anomaly of the connecting piece concomitant with a true nuclemalamic condition was the most serious. CONCLUSIONS: The abnormalities may be related to expression obstacles of nuclear genome and mitochondrial genome, and to anomalous cellular signal transduction during spermiogenesis as well.