Induction of autophagy by anthrax lethal toxin.

Abstract:

:Autophagy is an evolutionary conserved intracellular process whereby cells break down long-lived proteins and organelles. Accumulating evidences suggest increasing physiological significance of autophagy in pathogenesis of infectious diseases. Anthrax lethal toxin (LT) exerts its influence on numerous cells and herein, we report a novel effect of LT-induced autophagy on mammalian cells. Several autophagy biochemical markers including LC3-II conversion, increased punctuate distribution of GFP-LC3 and development of acidic vesicular organelles (AVO) were detected in cells treated with LT. Analysis of individual LT component revealed a moderate increase in LC3-II conversion for protective antigen-treated cells, whereas the LC3-II level in lethal factor-treated cells remained unchanged. In addition, our preliminary findings suggest a protective role of autophagy in LT intoxication as autophagy inhibition resulted in accelerated cell death. This study presents a hitherto undescribed effect of LT-induced autophagy on cells and provides the groundwork for future studies on the implication of autophagy in anthrax pathogenesis.

authors

Tan YK,Kusuma CM,St John LJ,Vu HA,Alibek K,Wu A

doi

10.1016/j.bbrc.2008.12.048

subject

Has Abstract

pub_date

2009-02-06 00:00:00

pages

293-7

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(08)02427-3

journal_volume

379

pub_type

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