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1 June 2004 Freeze-Dried Sperm Fertilization Leads to Full-Term Development in Rabbits
Ji-Long Liu, Hirokazu Kusakabe, Ching-Chien Chang, Hiroyuki Suzuki, David W. Schmidt, Marina Julian, Robert Pfeffer, Charles L. Bormann, X. Cindy Tian, Ryuzo Yanagimachi, Xiangzhong Yang
Author Affiliations +
Abstract

To date, the laboratory mouse is the only mammal in which freeze-dried spermatozoa have been shown to support full-term development after microinjection into oocytes. Because spermatozoa in mice, unlike in most other mammals, do not contribute centrosomes to zygotes, it is still unknown whether freeze-dried spermatozoa in other mammals are fertile. Rabbit sperm was selected as a model because of its similarity to human sperm (considering the centrosome inheritance pattern). Freeze- drying induces rabbit spermatozoa to undergo dramatic changes, such as immobilization, membrane breaking, and tail fragmentation. Even when considered to be “dead” in the conventional sense, rabbit spermatozoa freeze-dried and stored at ambient temperature for more than 2 yr still have capability comparable to that of fresh spermatozoa to support preimplantation development after injection into oocytes followed by activation. A rabbit kit derived from a freeze-dried spermatozoon was born after transferring 230 sperm-injected oocytes into eight recipients. The results suggest that freeze-drying could be applied to preserve the spermatozoa from most other species, including human. The present study also raises the question of whether rabbit sperm centrosomes survive freeze-drying or are not essential for embryonic development.

Ji-Long Liu, Hirokazu Kusakabe, Ching-Chien Chang, Hiroyuki Suzuki, David W. Schmidt, Marina Julian, Robert Pfeffer, Charles L. Bormann, X. Cindy Tian, Ryuzo Yanagimachi, and Xiangzhong Yang "Freeze-Dried Sperm Fertilization Leads to Full-Term Development in Rabbits," Biology of Reproduction 70(6), 1776-1781, (1 June 2004). https://doi.org/10.1095/biolreprod.103.025957
Received: 26 November 2003; Accepted: 1 February 2004; Published: 1 June 2004
KEYWORDS
fertilization
in vitro fertilization
oocyte development
sperm
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