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Related Experiment Videos

c-Flip expression and function in fetal mouse gonocytes.

Claudia Giampietri1, Simonetta Petrungaro, Francesca G Klinger

  • 1Istituto Pasteur-Fondazione Cenci Bolognetti, Department of Histology and Medical Embryology, University of Rome La Sapienza, Rome, Italy. claudia.giampietri@uniroma1.it

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|November 3, 2005
PubMed
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Cellular apoptosis is crucial for spermatogenesis. This study reveals that c-Flip long isoform (c-FlipL) protects fetal gonocytes from Fas-induced cell death, ensuring germ stem cell development.

Area of Science:

  • Reproductive Biology
  • Cellular Biology
  • Developmental Biology

Background:

  • Apoptosis is essential for spermatogenesis, with significant gonocyte degeneration occurring during fetal and postnatal development.
  • This programmed cell death selects cells committed to becoming germ stem cells.

Purpose of the Study:

  • To investigate the mechanisms controlling the extensive apoptosis of fetal gonocytes.
  • To evaluate the expression and function of c-Flip, an apoptosis inhibitor, in the fetal testis.

Main Methods:

  • Examined c-Flip long isoform (c-FlipL) and Fas protein expression in fetal testes at various developmental stages (13.5, 16.5, 18.5 days post coitum).
  • Utilized antisense c-Flip oligos to inhibit c-FlipL function.
  • Assessed sensitivity to Fas-induced apoptosis and measured caspase-10 activity.

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Main Results:

  • c-FlipL was expressed in gonocytes at 16.5 and 18.5 dpc, coinciding with Fas protein presence.
  • Testes with high c-FlipL levels resisted Fas-induced apoptosis, while inhibition sensitized them.
  • Gonocyte apoptosis sensitivity showed an inverse relationship with c-FlipL levels, and caspase-10 activity was also inversely related.

Conclusions:

  • This study provides the first evidence of c-Flip expression in fetal testes.
  • c-Flip plays a protective role against Fas-dependent apoptosis in fetal gonocytes.
  • These findings elucidate a key mechanism in germ stem cell selection during development.