A comprehensive study of p53 transcriptional activity in thymus and spleen of gamma irradiated mouse: high sensitivity of genes involved in the two main apoptotic pathways.

Abstract:

PURPOSE:Gamma-irradiation leads to activation of p53 tumour suppressor gene and to p53-dependant stimulation of a large panel of cellular genes including proapoptotic genes involved in intrinsic and extrinsic pathways. Most in vivo published data referred to high (lethal) irradiation doses. The present study was performed to analyse the p53-dependent response to more relevant low irradiation doses. MATERIALS AND METHODS:Mice were whole body exposed to irradiation doses decreasing from 5 - 0.05 Gy. Gene expression was estimated by real time reverse transcriptase polymerase chain reaction measurements on RNA extracted from thymus and spleen. Apoptosis was evaluated by the percentage of either annexin V positive or sub-G1 cells. RESULTS:A 0.1 Gy irradiation dose already gives a significant stimulation of Puma (p53 up-regulated modulator of apoptosis), and 0.2 Gy of Bax (Bcl-2-associated X protein) and Killer/DR5 (Death Receptor 5). The expression of genes involved in the two apoptotic pathways was induced as soon as 1 h post-irradiation and reached a maximum at 3 h, the induction level depending on both the gene and the organ. A significant increase in the number of apoptotic cells is already detectable at 0.5 Gy with a maximum of induction at 6 h. CONCLUSIONS:Our results reveal the high in vivo sensitivity of p53-dependent transcriptional activation of genes involved in the two main apoptotic pathways, their stimulation preceding the induction of apoptosis.

journal_name

Int J Radiat Biol

authors

Alvarez S,Drané P,Meiller A,Bras M,Deguin-Chambon V,Bouvard V,May E

doi

10.1080/09553000600949624

subject

Has Abstract

pub_date

2006-11-01 00:00:00

pages

761-70

issue

11

eissn

0955-3002

issn

1362-3095

pii

UHP85QM394102685

journal_volume

82

pub_type

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