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© The Rockefeller University Press, 0022-1007/2000/1/33/ $5.00
The Journal of Experimental Medicine, Volume 191, Number 1, January 3, 2000 33-46


Original Article

The HIV-1 Viral Protein R Induces Apoptosis via a Direct Effect on the Mitochondrial Permeability Transition Pore

Etienne Jacotota, Luigi Ravagnana, Markus Loefflera, Karine F. Ferria, Helena L.A. Vieiraa, Naoufal Zamzamia, Paola Costantinia, Sabine Druillennecb, Johan Hoebekec, Jean Paul Briandc, Theano Irinopouloud, Eric Daugasa, Santos A. Susina, Denis Cointee, Zhi Hua Xief, John C. Reedf, Bernard P. Roquesb, and Guido Kroemera
a Centre National de la Recherche Scientifique, F-94801 Villejuif, France
b Unité de Pharmacochimie Moléculaire et Structurale, Institut National de la Santé et de Recherche Médicale (INSERM) U266, CNRS UMR 860, Université René Descartes (Paris V), 75006 Paris, France
c Institut de Biologie Moléculaire et Cellulaire, Centre National de la Recherche Scientifique, 67084 Strasbourg, France
d INSERM U430, Broussais Hospital, 75014 Paris, France
e Laboratoire de Virologie et Immunologie, Hopital Antoine Beclère, 92141 Clamart, France
f The Burnham Institute, La Jolla, California 92037

Correspondence to: Guido Kroemer, 19 rue Guy Môquet, B.P. 8, F-94801 Villejuif, France. Tel:33-1-49-58-35-13 Fax:33-1-49-58-35-09 E-mail:kroemer{at}infobiogen.fr.

Viral protein R (Vpr) encoded by HIV-1 is a facultative inducer of apoptosis. When added to intact cells or purified mitochondria, micromolar and submicromolar doses of synthetic Vpr cause a rapid dissipation of the mitochondrial transmembrane potential ({Delta}{Psi}m), as well as the mitochondrial release of apoptogenic proteins such as cytochrome c or apoptosis inducing factor. The same structural motifs relevant for cell killing are responsible for the mitochondriotoxic effects of Vpr. Both mitochondrial and cytotoxic Vpr effects are prevented by Bcl-2, an inhibitor of the permeability transition pore complex (PTPC). Coincubation of purified organelles revealed that nuclear apoptosis is only induced by Vpr when mitochondria are present yet can be abolished by PTPC inhibitors. Vpr favors the permeabilization of artificial membranes containing the purified PTPC or defined PTPC components such as the adenine nucleotide translocator (ANT) combined with Bax. Again, this effect is prevented by addition of recombinant Bcl-2. The Vpr COOH terminus binds purified ANT, as well as a molecular complex containing ANT and the voltage-dependent anion channel (VDAC), another PTPC component. Yeast strains lacking ANT or VDAC are less susceptible to Vpr-induced killing than control cells yet recover Vpr sensitivity when retransfected with yeast ANT or human VDAC. Hence, Vpr induces apoptosis via a direct effect on the mitochondrial PTPC.

Key Words: apoptosis, Bcl-2, cell death, mitochondria, Vpr


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