Effect of nordihydroguaiaretic acid on spermatogenesis and fertility in rats.

Nordihydroguaiaretic acid (NDGA) is a naturally occurring lignan with potent antioxidant activity. Currently, it is in clinical trials as anticancer agent. As there is no earlier report on the effect of NDGA on spermatogenesis and fertility, this study was designed to investigate this aspect. Administration of NDGA to rats for 60 days produced degenerative changes in testis but had no effect on sperm DNA integrity test and androgen receptor expression. Ultrastructural studies revealed loss of integrity of cells in seminiferous tubules, vacuolation and presence of apoptotic bodies. Derangement of the outer dense fibres was noted in some sperm flagella. Acrosome formation appears to be normal. About 13.7% of epididymal spermatozoa had deformations like short tail or rounded head. This may explain the lower fertility index in NDGA-treated group. No external deformations in newborns were noted. In conclusion, NDGA may have adverse effects on spermatogenesis.