睾丸内白膜下注射法,一种雄性节育药的初筛模型

INTRATESTICULAR SUBCAPSULAR ASSAY, A SIMPLE METHOD FOR THE PRELIMINARY SCREENING OF MALE CONTRACEPTIVES

探索了一种简易男性节育药的筛选方法,将少量样品注射到大鼠睾丸白膜下,共2次,于第3周末解剖大鼠,作附睾精子、睾丸和附睾组织学检查。该法比WHO制订的MB-50分析法简单、省时、用药量少。药物注入后可在睾丸内进行部分代谢,因此,具有抗生育活性的代谢产物也能得到阳性结果。共筛选了近200个样品,并与MB-50比较,结果基本一致,仅出现个别假阳性并无假阴性,因此可以作为初筛方法。

The MB-50 protocol worked out for long by the Worm Health Organization has been widely employed for the screening of male contraceptives. With this method, 40～80 rats will be used for 1 sample and the course of study will be about 3 months. In view of the high expenses and long duration of time needed, it seems to be not suitable for a preliminary screening. We have exploited a much simpler method, the intratesticular subcapsular assay. The method is as follows: Puncture the scrotal skin and the tunica albuginea at the equatorial plane of the testis just opposite to the epididymis with an intradermal needle fixed at a tuberculin syringe. Then push on the needle for 3～4 mm along the equator parallel to the tunica albuginea. Inject 100 μl of solution containing 0.1～5 mg of the sample to each testis. To the controls, only the vehicle is injected. One week later the same procedure is repeated and 2 more weeks later, the animals are sacrificed and the data are observed (see Table 1 and 2). In this paper, 7 samples screened with this method were compared with results of the MB-50 method, no positive sample was missed except one false positive sample. These results indicate the coincidence between these two methods.