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J. Exp. Med.,
Volume 189, Number 7, April 5, 1999 1043-1052
By


From the * Centre National de la Recherche Scientifique, UPR 9051, Laboratoire Associé au Comité
de Paris de la Ligue contre le Cancer, Institut d'Hématologie de l'Université de Paris VII; In acute promyelocytic leukemia (APL) patients, retinoic acid (RA) triggers differentiation while
arsenic trioxide (arsenic) induces both a partial differentiation and apoptosis. Although their
mechanisms of action are believed to be distinct, these two drugs both induce the catabolism of
the oncogenic promyelocytic leukemia (PML)/RAR
Service
d'Anatomie Pathologique, § Service d'Hématologie Biologique,
Service des Maladies du Sang, Hôpital
St. Louis, 75475 Paris, Cedex 10 France; and ¶ The Hooper Foundation, Department of Biochemistry
and Biophysics, University of California at San Francisco, San Francisco, California 94143-0552
fusion protein. While APL cell lines resistant to one agent are sensitive to the other, the benefit of combining RA and arsenic in cell culture
is controversial, and thus far, no data are available in patients. Using syngenic grafts of leukemic blasts from PML/RAR
transgenic mice as a model for APL, we demonstrate that arsenic induces
apoptosis and modest differentiation, and prolongs mouse survival. Furthermore, combining arsenic with RA accelerates tumor regression through enhanced differentiation and apoptosis. Although RA or arsenic alone only prolongs survival two- to threefold, associating the two drugs
leads to tumor clearance after a 9-mo relapse-free period. These studies establishing RA/arsenic synergy in vivo prompt the use of combined arsenic/RA treatments in APL patients and exemplify how mouse models of human leukemia can be used to design or optimize therapies.
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