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Molecular and Cellular Biology, August 2000, p. 5680-5689, Vol. 20, No. 15
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Bcl-xL Prevents the Initial Decrease in Mitochondrial
Membrane Potential and Subsequent Reactive Oxygen Species
Production during Tumor Necrosis Factor Alpha-Induced
Apoptosis
Eyal
Gottlieb,
Matthew G.
Vander Heiden, and
Craig B.
Thompson*
Abramson Family Cancer Research Institute,
University of Pennsylvania, Philadelphia, Pennsylvania 19104
Received 9 February 2000/Returned for modification 4 April
2000/Accepted 6 May 2000
The Bcl-2 family of proteins are involved in regulating the redox
state of cells. However, the mode of action of Bcl-2 proteins remains
unclear. This work analyzed the effects of Bcl-xL on the cellular redox state after treatment with tumor necrosis factor alpha
(TNF-
) or exogenous oxidants. We show that in cells that undergo
TNF-
-induced apoptosis, TNF-
induces a partial decrease in
mitochondrial membrane potential (
m)
followed by high levels of reactive oxygen species (ROS). ROS
scavengers delay the progression of mitochondrial depolarization and
apoptotic cell death. This indicates that ROS are important mediators
of mitochondrial depolarization. However, ROS scavengers fail to prevent the initial TNF-
-induced decrease in

m. In contrast, expression of
Bcl-xL prevents both the initial decrease in

m following TNF-
treatment and the
subsequent induction of ROS. Bcl-xL itself does not act as
a ROS scavenger. In addition, Bcl-xL does not block the
initial decrease in 
m following treatment
with the oxidant hydrogen peroxide. However, unlike control-transfected
cells, Bcl-xL-expressing cells can recover their
mitochondrial membrane potential following the initial drop in

m induced by hydrogen peroxide. These
data suggest that Bcl-xL plays a regulatory role in
controlling the membrane potential of and ROS production by
mitochondria rather than acting as a direct antioxidant.
*
Corresponding author. Mailing address: Abramson Family
Cancer Research Institute, University of Pennsylvania, 421 Curie Blvd. BRB II/III Rm. 450, Philadelphia, PA 19104-6160. Phone: (215) 746-5515. Fax: (215) 746-5511. E-mail:
craig{at}mail.med.upenn.edu.
Molecular and Cellular Biology, August 2000, p. 5680-5689, Vol. 20, No. 15
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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