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Dev Reprod. 2016 Dec;20(4):315-329. doi: 10.12717/DR.2016.20.4.315. Epub 2016 Dec 31.

Induction of Fas-Mediated Apoptosis by Interferon-γ is Dependent on Granulosa Cell Differentiation and Follicular Maturation in the Rat Ovary.

Development & reproduction

Hye-Jeong Lee, Ji Young Kim, Ji Eun Park, Yong-Dal Yoon, Benjamin K Tsang, Jong-Min Kim

Affiliations

  1. Department of Pharmacology, College of Medicine, Dong-A University, Busan 602-714, Korea.
  2. Division of Medical Oncology, Department of Internal Medicine, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea.
  3. Department of Anatomy and Cell Biology, College of Medicine, Dong-A University, Busan 602-714, Korea.
  4. Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 133-791, Korea.
  5. Department of Obstetrics and Gynecology and Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON, Canada K1Y 4E9.

PMID: 28144637 PMCID: PMC5270607 DOI: 10.12717/DR.2016.20.4.315

Abstract

Fas ligand (FasL) and its receptor Fas have been implicated in granulosa cell apoptosis during follicular atresia. Although interferon-gamma (IFN-γ) is believed to be involved in the regulation Fas expression in differentiated granulosa or granulosa-luteal cells, the expression of this cytokine and its role in the regulation of the granulosa cell Fas/FasL system and apoptosis during follicular maturation have not been thoroughly investigated. In the present study, we have examined the presence of IFN-γ in ovarian follicles at different stage of development by immunohistochemistry and related their relative intensities with follicular expression of Fas and FasL, and with differences in granulosa cell sensitivity to Fas activation by exogenous agonistic Anti-Fas monoclonal antibody (Fas mAb). Although IFN-γ immunostaining was detectable in oocyte and granulosa cells in antral follicles, most intense immunoreactivity for the cytokine was observed in these cells of preantral follicles. Intense immunoreactivity for IFN-γ was most evident in granulosa cells of atretic early antral follicles where increased Fas and FasL expression and apoptosis were also observed. Whereas low concentrations of IFN-γ (10-100 U/mL) significantly increased Fas expression in undifferentiated granulosa cells (from preantral or very early antral follicles)

Keywords: Apoptosis; Fas; Granulosa cells; Interferon-γ; Ovary

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