d-aspartate treatment in vitro improves mouse sperm fertility in young B6N mice

Theriogenology
Marcello RaspaFerdinando Scavizzi

Abstract

We previously reported that the administration of d-aspartate (D-Asp) in drinking water over a 2-4-week period to 7-week-old mice resulted in higher sperm quality and increased in vitro fertilisation (IVF) rates associated with a systemic increase of luteinizing hormone and testosterone levels in the serum. The goal of this study was to investigate the effects of in vitro treatment with D-Asp on the IVF rate, embryo transfer, and sperm parameters of cryopreserved-thawed C57BL/6NTacCnrm (B6N) spermatozoa derived from young and adult mice. In this study, cryopreserved-thawed B6N spermatozoa from males aging 9, 11, 13, and 16 weeks were treated for 1 h with 4 mM D-Asp during capacitation. Thereafter, the in vitro fertilisation ability and the embryo transfer efficiency were analysed. Also, the kinetic activity of the treated spermatozoa and the acrosome reaction were measured after 1 h, 2 h, and 5 h of incubation. The capacitation rate of spermatozoa was determined after 1 h of pre-incubation. Spermatozoa from 9- and 11-week-old mice, which were treated with D-Asp, led to significantly increased IVF rates. However, spermatozoa derived from 13- and 16-week-old mice did not lead to a significant improvement in the fertilisation rate...Continue Reading

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