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Whole Ovary Immunofluorescence, Clearing, and Multiphoton Microscopy for Quantitative 3D Analysis of the Developing Ovarian Reserve in Mouse
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Whole Ovary Immunofluorescence, Clearing, and Multiphoton Microscopy for Quantitative 3D Analysis of the Developing Ovarian Reserve in Mouse

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Ubiquitin carboxyl-terminal hydrolase L1 contributes to the oocyte selective elimination in prepubertal mouse ovaries

Yan-Qiong Gu1, Qiu-Ju Chen, Zheng Gu

  • 1Shanghai Medical College of Fudan University, Shanghai, China.

Sheng Li Xue Bao : [Acta Physiologica Sinica]
|April 21, 2009
PubMed

Insights

Abnormal oocyte elimination during mouse development involves Ubiquitin carboxyl-terminal hydrolase L1 (UCH-L1). Increased UCH-L1 expression correlates with the removal of defective oocytes, suggesting its crucial role in ovarian development.

Area of Science:

  • Reproductive Biology
  • Cellular Biology
  • Developmental Biology

Background:

  • The ubiquitin system regulates apoptosis through protein degradation.
  • Ubiquitin carboxyl-terminal hydrolase L1 (UCH-L1) is implicated in apoptosis, particularly in spermatogenesis.
  • Selective elimination of abnormal oocytes is critical for proper ovarian development.

Purpose of the Study:

  • To investigate the role of UCH-L1 in the elimination of abnormal oocytes during prepubertal mouse ovary development.
  • To examine the changes in follicular pool and UCH-L1 expression during this critical period.
  • To explore the association of UCH-L1 with other proteins like Jab1 and p27(Kipl) in oocyte apoptosis.

Main Methods:

  • Immunohistochemical techniques were used to assess follicular numbers and UCH-L1 expression in prepubertal mouse ovaries.
  • Immunofluorescent colocalization was employed to study the localization of UCH-L1 and Jab1 in oocytes.
  • Affinity analysis was performed to confirm the interaction between UCH-L1 and Jab1.

Main Results:

  • A significant decrease in the follicular pool was observed between postnatal days 21 and 28.
  • UCH-L1 protein expression increased during this period, particularly in morphologically abnormal oocytes.
  • UCH-L1 was found to concentrate in abnormal oocytes, with parallel changes observed in Jab1, and a confirmed interaction between UCH-L1 and Jab1.

Conclusions:

  • UCH-L1 plays a significant role in the selective elimination of abnormal oocytes during prepubertal mouse development.
  • The function of UCH-L1 in oocyte apoptosis may involve interactions with Jab1 and p27(Kipl).
  • These findings contribute to understanding the molecular mechanisms governing oocyte quality control in early ovarian development.

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