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Obox4-silencing-activated STAT3 and MPF/MAPK signaling accelerate nuclear membrane breakdown in mouse oocytes

Hyun-Seo Lee1, Kyeoung-Hwa Kim1, Eun-Young Kim1

  • 1DNA Repair Research CenterChosun University, Gwangju, KoreaDepartment of Biomedical ScienceCollege of Life Science, CHA University, CHA Bio Complex, Pangyo-Ro 335, Bundang-gu, Seongnam-si, Gyeonggi-do 463-400, Korea.

Reproduction (Cambridge, England)
|January 15, 2016
PubMed

Insights

Oocyte-specific homeobox 4 (Obox4) protein is crucial for maintaining oocyte arrest. Obox4 regulates germinal vesicle breakdown by controlling MPF/MAPK and STAT3 signaling pathways.

Area of Science:

  • Reproductive Biology
  • Molecular Endocrinology
  • Cell Signaling

Background:

  • Oocyte maturation is a complex process involving precise regulation of cell cycle progression.
  • Oocyte-specific homeobox 4 (Obox4) has been identified as critical for maintaining germinal vesicle (GV) integrity and successful meiosis.
  • The molecular mechanisms by which Obox4 controls GV breakdown remain incompletely understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying Obox4's role in regulating germinal vesicle nuclear membrane breakdown.
  • To investigate the involvement of key signaling pathways, including MPF, MAPK, and STAT3, in Obox4-mediated oocyte maturation.

Main Methods:

  • Oocyte-specific homeobox 4 (Obox4) RNA interference (RNAi) was performed in mouse oocytes.
  • Activation of maturation-promoting factor (MPF), MAPK, and signal transducer and activator of transcription 3 (STAT3) pathways were assessed.
  • Germinal vesicle breakdown (GVBD) was monitored in the presence of 3-isobutyl-1-metyl-xanthine (IBMX) and interferon α (IFNA).
  • STAT3 inhibition was achieved using Stattic.

Main Results:

  • Obox4 RNAi led to premature activation of MPF, MAPK, and STAT3 in GV-stage oocytes, inducing GV breakdown despite high cAMP levels.
  • Interferon α (IFNA), a STAT3 activator, promoted oocyte maturation and cumulus cell expansion, indicating STAT3 activation is sufficient for meiotic continuation.
  • Inhibition of STAT3 using Stattic confirmed its essential role in GVBD in Obox4-silenced oocytes.

Conclusions:

  • Obox4 acts as an upstream regulator of MPF/MAPK and STAT3 signaling pathways.
  • Obox4 is a key regulator maintaining the germinal vesicle (GV) arrest mechanism in oocytes, preventing premature meiotic resumption.

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