The role of p63 in germ cell apoptosis in the developing testis.

Abstract:

:The fetal and neonatal development of male germ cells (gonocytes) is a poorly understood but crucial process for establishing fertility. In rodents, gonocytes go through two phases of proliferation accompanied by apoptosis and separated by a quiescent period during the end of fetal development. P63 is a member of the P53 gene family that yields six isoforms. We detected only the p63 protein and no p53 and p73 in the nucleus of the gonocytes of mouse testes. We report for the first time the ontogeny of each p63 mRNA isoform during testis development. We observed a strong expression of p63gamma mRNA and protein when gonocytes are in the quiescent period. In vitro treatment with retinoic acid prevented gonocytes from entering the quiescent period and was correlated with a reduced production of p63gamma isoform mRNA. We investigated the function of p63 by studying the testicular phenotype of P63-null mice. P63 invalidation slightly, but significantly increased the number of gonocytes counted during the quiescent period. As P63-null animals die at birth we used an original organ culture that mimicked neonatal in vivo development to study further the testicular development. P63 invalidation resulted in a sharply increased number of gonocytes during the culture period due to a decrease in spontaneous apoptosis with no change in proliferation. P63 invalidation also caused abnormal morphologies in the germ cells that were also found in P63(+/-) adult male mice. Thus, p63 appears as an important regulator of germ cell development.

journal_name

J Cell Physiol

authors

Petre-Lazar B,Livera G,Moreno SG,Trautmann E,Duquenne C,Hanoux V,Habert R,Coffigny H

doi

10.1002/jcp.20829

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

87-98

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

210

pub_type

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