Production of normal offspring from mouse oocytes injected with spermatozoa cryopreserved with or without cryoprotection

Journal of Reproduction and Fertility
Teruhiko WakayamaR Yanagimachi

Abstract

Epididymal mouse spermatozoa were suspended in various physiological solutions (CZB, PBS or isotonic saline) with or without 18% (w/v) raffinose before cooling to -20 degrees, -50 degrees or -196 degrees C and storage for 1-28 days. After thawing, a few spermatozoa frozen with raffinose were partially motile (about 2%) but in all other treatments they were immotile and diagnosed as 'dead' by staining that differentiates between live and dead spermatozoa. Almost all oocytes injected with sperm heads (nuclei) from spermatozoa frozen with and without raffinose were fertilized normally (95-100%) and developed to the two-cell stage (89-100%). No differences were found between the physiological media. The majority of oocytes fertilized with spermatozoa frozen in CZB medium developed to blastocysts (80-94%) but development was significantly reduced after fertilization with spermatozoa frozen in PBS and isotonic saline especially in the absence of raffinose (69 and 70% versus 51 and 50%). Normal fertile offspring were obtained in all treatments but there were significantly fewer offspring with spermatozoa stored at -196 degrees C in isotonic saline with or without raffinose and CZB with raffinose. Testicular spermatozoa were extremely ...Continue Reading

Citations

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