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* Centre National de la Recherche Scientifique, Unité Propre
de Recherche 9051, Laboratoire Associé au Comité de Paris
de la Ligue Contre le Cancer, Institut d'Hématologie,
Hôpital St. Louis, 75475 Paris Cedex 10, France;
Contributed by C. C. Tan, July 24, 1997
In acute promyelocytic leukemia (APL), the typical t(15;17) and the
rare t(11;17) translocations express, respectively, the PML/RAR
Proc. Natl. Acad. Sci. USA
Vol. 94,
pp. 10255-10260,
September 1997
Genetics
Leukemia-associated retinoic acid receptor
fusion partners,
PML and PLZF, heterodimerize and colocalize to nuclear bodies
,
,
,
,
,
,
,
,
Leukaemia Research Fund Centre at the Institute of Cancer
Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB,
United Kingdom;
Shanghai Institute of Hematology, Rui-Jin
Hospital, Shanghai Second Medical University, 197 Rui-Jin Road II,
Shanghai 200025, China; § Fudan University, Shanghai 200433, China; and ¶ Department of Medicine, Mount Sinai School of
Medicine, One Gustave L. Levy Place, New York, NY 10029
and PLZF/RAR
fusion proteins (where RAR
is retinoic acid
receptor
). Herein, we demonstrate that the PLZF and PML proteins
interact with each other and colocalize onto nuclear bodies (NBs).
Furthermore, induction of PML expression by interferons leads to a
recruitment of PLZF onto NBs without increase in the levels of the PLZF
protein. PML/RAR
and PLZF/RAR
localize to the same
microspeckled nuclear domains that appear to be common targets for the
two fusion proteins in APL. Although PLZF/RAR
does not affect the
localization of PML, PML/RAR
delocalizes the
endogenous PLZF protein in t(15;17)-positive NB4 cells,
pointing to a hierarchy in the nuclear targeting of these proteins.
Thus, our results unify the molecular pathogenesis of APL with at least two different RAR
gene translocations and stress the importance of
alterations of PLZF and RAR
nuclear localizations in this disease.
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