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Feasibility of cryopreservation of zebrafish (Danio rerio) primordial germ cells by whole embryo freezing
2009
Higaki, S.(Hokkaido Univ., Sapporo (Japan)) | Mochizuki, K. | Baba, H. | Akashi, Y. | Yamaha, E. | Katagiri, S. | Takahashi, Y.
We investigated the feasibility of cryopreservation of zebrafish (Danio rerio) blastomeres and primordial germ cells (PGCs) by rapid freezing of dechorionated whole embryos at the blastula, gastrula and segmentation stages. Initially we examined the glass-forming properties and embryo toxicities of 5 cryoprotectants: methanol (MeOH), ethylene glycol (EG), dimethyl sulfoxide (DMSO), propylene glycol (PG), and 1,3-butylene glycol (1,3-BG). Embryos at the blastula and gastrula stages had high sensitivities to cryoprotectant toxicities and were fragile against mechanical damage. Thus the segmentation stage embryos, the PGCs of which were visualized by injecting green fluorescence protein-nos1 3'UTR mRNA, were frozen using solutions containing each cryoprotectant at 6 M (first trial) and 2 types of cryoprotectants at 3 M each (second trial). In the first trial, live PGCs were recovered from most of the embryos frozen with EG (about 2 cells/embryo); however, a few embryos had live PGCs when embryos were frozen with other cryoprotectants. In the second trial; a mixture of EG + PG better preserved the viability of PGCs in frozen embryos. Live PGCs were recovered from all embryos frozen with EG + PG (about 3 cells/embryo), and the survival rate of PGCs was estimated to be about 25% based on the number of live PGCs in fresh embryos (about 12 cells/embryo). The present study indicates that we can utilize rapid freezing of dechorionated whole embryos at the segmentation stage for the cryopreservation of PGCs.
Show more [+] Less [-]Expression of protein kinase C in the testes of horse
1998
Jin, J.K. | Shin, T.K. (Cheju National University, Cheju (Korea Republic). Department of Veterinary)
Spermiogenesis and fine structure of the sertoli cell junctional specialization in the Jindo dog - (2) - Fine structure of the sertoli cell junctional specialization
1992
Park, Y.S. | Lee, J.H. (Chonnam National University, Kwangju (Korea Republic). College of Veterinary Medicine)
Spermiogenesis and fine structure of the sertoli cell junctional specialization in the Jindo dog - (1) - Studies on spermiogenesis in the Jindo dog
1992
Park, Y.S. | Lee, J.H. (Chonnam National University, Kwangju (Korea Republic). Department of Veterinary Anatomy)
