BAX regulates follicular endowment in mice

Chuck R. Greenfeld, Melissa E. Pepling, Janice K. Babus, Priscilla A. Furth, Jodi A. Flaws

Research output: Contribution to journalArticle

Abstract

It is believed that the endowment of primordial follicles in mammalian ovaries is finite. Once follicles are depleted, infertility ensues. Thus, the size of the initial endowment has consequences for fertility and reproductive longevity. Follicular endowment is comprised of various processes that culminate with the incorporation of meiosis-arrested oocytes into primordial follicles. Apoptosis is prominent during follicular endowment, and apoptosis regulatory genes are involved in its regulation. Conflicting data exist with regard to the role of the proapoptotic Bcl-2 associated X protein (BAX) in follicular endowment. Therefore, we investigated the role of BAX during follicular endowment in embryonic and neonatal ovaries. We found that BAX is involved in regulating follicular endowment in mice. Deletion of Bax yields increased oocyte numbers in embryonic ovaries and increased follicle numbers in neonatal ovaries when compared with wild-type ovaries. Increased follicular endowment in Bax -/- ovaries is not due to enhanced germ cell viability. Further, it is not due to an increased primordial germ cell (PGC) allotment, a delay in the onset of meiosis, or altered proliferative activity of oogonia. Instead, our data suggest that the regulatory activity of BAX in follicular endowment likely occurs during PGC migration, prior to PGC colonization of the gonad.

Original languageEnglish (US)
Pages (from-to)865-876
Number of pages12
JournalReproduction
Volume133
Issue number5
DOIs
StatePublished - May 2007
Externally publishedYes

Fingerprint

bcl-2-Associated X Protein
Financial Management
Ovary
Germ Cells
Meiosis
Oocytes
Oogonia
Apoptosis
Gonads
Regulator Genes
Infertility
Cell Movement
Fertility
Cell Survival

ASJC Scopus subject areas

  • Obstetrics and Gynecology
  • Cell Biology
  • Endocrinology
  • Embryology

Cite this

Greenfeld, C. R., Pepling, M. E., Babus, J. K., Furth, P. A., & Flaws, J. A. (2007). BAX regulates follicular endowment in mice. Reproduction, 133(5), 865-876. https://doi.org/10.1530/REP-06-0270

BAX regulates follicular endowment in mice. / Greenfeld, Chuck R.; Pepling, Melissa E.; Babus, Janice K.; Furth, Priscilla A.; Flaws, Jodi A.

In: Reproduction, Vol. 133, No. 5, 05.2007, p. 865-876.

Research output: Contribution to journalArticle

Greenfeld, CR, Pepling, ME, Babus, JK, Furth, PA & Flaws, JA 2007, 'BAX regulates follicular endowment in mice', Reproduction, vol. 133, no. 5, pp. 865-876. https://doi.org/10.1530/REP-06-0270
Greenfeld CR, Pepling ME, Babus JK, Furth PA, Flaws JA. BAX regulates follicular endowment in mice. Reproduction. 2007 May;133(5):865-876. https://doi.org/10.1530/REP-06-0270
Greenfeld, Chuck R. ; Pepling, Melissa E. ; Babus, Janice K. ; Furth, Priscilla A. ; Flaws, Jodi A. / BAX regulates follicular endowment in mice. In: Reproduction. 2007 ; Vol. 133, No. 5. pp. 865-876.
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