Immunohistochemical analysis of tyrosine phosphorylation and AP-1 transcription factors c-Jun, Jun D, and Fos family during early ovarian follicle development in the mouse

Kutluk H. Oktay, Maja H. Oktay

Research output: Contribution to journalArticle

12 Scopus citations


The growth control mechanism of early-stage ovarian follicles is unknown. Tyrosine phosphorylation of signaling molecules and changes in expression and activation of AP-1 transcription factors have been implicated in growth regulation of numerous cell types. In this study, we used immunohistochemistry to analyze tyrosine phosphorylation patterns and expression and activation of selected AP-1 transcription factors in mouse ovarian follicles. The ovaries were collected from B62F1/J mice in estrus. Representative sections were immunostained for phosphotyrosine, phospho-c-Jun, Jun D, and c-Fos. Phosphotyrosine staining was perioocytic from the transitional stage until approximately 5 to 7 layers of granulosa cells had formed. Perioocytic staining was then replaced by scattered stippled staining in granulosa cells of larger follicles. Phospho c-Jun was exclusively expressed in mitotic granulosa cells of follicles from transitional to antral stages. Jun D was expressed in the oocytes of primordial, primary, or transitional follicles and disappeared at the 2-layer preantral stage. Fos was present in corpora lutea and theca cells but not in granulosa cells. Collectively, these data indicate that phosphotyrosine signaling and AP-1 transcription factors are intimately involved in early stages of ovarian follicle growth.

Original languageEnglish (US)
Pages (from-to)364-369
Number of pages6
JournalApplied Immunohistochemistry and Molecular Morphology
Issue number4
Publication statusPublished - Dec 2004



  • AP-1 transcription factors
  • Follicular development
  • Growth factors
  • Ovary
  • Phosphotyrosine
  • Signal transduction

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology
  • Medical Laboratory Technology

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