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Sci Rep. 2014 Aug 22;4:6175. doi: 10.1038/srep06175.

Bmi1 expression in long-term germ stem cells.

Author information

1
1] Department of Stem Cell Pathology, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan [2] Department of Urology and Andrology, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan.
2
1] Department of Stem Cell Pathology, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan [2] Third Department of Internal Medicine, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan.
3
Department of Stem Cell Pathology, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan.
4
1] Department of Stem Cell Pathology, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan [2] Department of Surgery, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan.
5
1] Department of Stem Cell Pathology, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan [2] Department of Dermatology, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan.
6
1] Department of Stem Cell Pathology, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan [2] Department of Pediatrics, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan.
7
Department of Urology and Andrology, Kansai Medical University, 2-5-1 Shin-machi, Osaka 573-1010, Japan.

Abstract

Asingle cells in undifferentiated spermatogonia are considered to be the most primitive forms of germ stem cells (GSCs). Although GFRα1 is thought to be a marker of Asingle cells, we found that Bmi1(High) is more specific than GFRα1 for Asingle cells. Bmi1(High) expression in Asingle cells is correlated with seminiferous stages, and its expression was followed by the proliferative stage of Asingle GSCs. In contrast, GFRα1 expression was seminiferous stage-independent. Fate analyses of EdU-positive Bmi1(High)-positive cell-derived Asingle cells revealed that these cells self-renewed or generated transient amplifying Apaired cells. Bmi1(High)-positive cells were resistant to irradiation-induced injury, after which they regenerated. Elimination of Bmi1(High)-positive cells from seminiferous tubules resulted in the appearance of tubules with seminiferous stage mismatches. Thus, in this study, we found that Bmi1(High) is a seminiferous stage-dependent marker for long-term GSCs and that Bmi1(High)-positive cells play important roles in maintaining GSCs and in regenerating spermatogenic progenitors after injury.

PMID:
25146451
PMCID:
PMC4141270
DOI:
10.1038/srep06175
[Indexed for MEDLINE]
Free PMC Article

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