title: Percoll fractionation of adult mouse spermatogonia improves germ cell transplantation.
abstract: OBJECTIVE
  To isolate and transplant germ cells from adult mouse testes for transplantation.
  
  
  METHODS
  In order to distinguish transplanted cells from endogenous cells of recipients, donor transgenic mice expressing green fluorescent protein (GFP) were used. Germ cells were collected from the donors at 10-12 weeks of age and spermatogonia were concentrated by percoll fractionation and transplanted into recipient seminiferous tubules that had been previously treated with busulfan at 5 weeks of age to remove the endogenous spermatogenic cells.
  
  
  RESULTS
  Twenty weeks after the transplantation, a wide spread GFP signal was observed in the recipient seminiferous tubules. The presence of spermatogenesis and spermatozoa was confirmed in sections of 12 out of 14 testes transplanted (86 %). However, when germ cells were transplanted without concentration the success rate was zero (0/9).
  
  
  CONCLUSIONS
  Germ cells from adult mouse testes can be successfully transplanted into recipient seminiferous tubules if the cell population is rich in spermatogonia and the percoll fractionation is useful in obtaining such a cell population.
authors.affiliation: Department of Bioenvironmental Medicine (A3), Graduate School of Medicine, Chiba University, Chuo-ku, Chiba 260-8670, Japan.
authors.forename: Kyu-Bom
authors.initials: KB
authors.lastname: Koh
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Komiyama
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Toyama
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Adachi
authors.forename: Chisato
authors.initials: C
authors.lastname: Mori
mesh_terms: D000818:Animals; D002458:Cell Fractionation; D049452:Green Fluorescent Proteins; D008164:Luminescent Proteins / Q000235:genetics; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D012671:Seminiferous Tubules / Q000166:cytology / Q000502:physiology; D013091:Spermatogenesis / Q000502:physiology; D013093:Spermatogonia / Q000502:physiology* / Q000637:transplantation*; D013737:Testis / Q000166:cytology
chemical_list: D008164:Luminescent Proteins; D049452:Green Fluorescent Proteins