Death receptor-induced activation of the Chk2- and histone H2AX-associated DNA damage response pathways.

Abstract:

:TRAIL is an endogenous death receptor ligand also used therapeutically because of its selective proapoptotic activity in cancer cells. In the present study, we examined chromatin alterations induced by TRAIL and show that TRAIL induces a rapid activation of DNA damage response (DDR) pathways with histone H2AX, Chk2, ATM, and DNA-PK phosphorylations. Within 1 h of TRAIL exposure, immunofluorescence confocal microscopy revealed gamma-H2AX peripheral nuclear staining (gamma-H2AX ring) colocalizing with phosphorylated/activated Chk2, ATM, and DNA-PK inside heterochromatin regions. The marginal distribution of DDR proteins in early apoptotic cells is remarkably different from the focal staining seen after DNA damage. TRAIL-induced DDR was suppressed upon caspase inhibition or Bax inactivation, demonstrating that the DDR activated by TRAIL is downstream from the mitochondrial death pathway. H2AX phosphorylation was dependent on DNA-PK, while Chk2 phosphorylation was dependent on both ATM and DNA-PK. Downregulation of Chk2 decreased TRAIL-induced cell detachment; delayed the activation of caspases 2, 3, 8, and 9; and reduced TRAIL-induced cell killing. Together, our findings suggest that nuclear activation of Chk2 by TRAIL acts as a positive feedback loop involving the mitochondrion-dependent activation of caspases, independently of p53.

journal_name

Mol Cell Biol

authors

Solier S,Sordet O,Kohn KW,Pommier Y

doi

10.1128/MCB.00581-08

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

68-82

issue

1

eissn

0270-7306

issn

1098-5549

pii

MCB.00581-08

journal_volume

29

pub_type

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