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Immunolocalization of the Bcl-2 protein within hematopoietic neoplasms
M Zutter, D Hockenbery, GA Silverman and SJ Korsmeyer
Department of Medicine, Howard Hughes Medical Institute, Washington
University School of Medicine, St Louis, MO 63110.
The Bcl-2 proto-oncogene was discovered at the t(14;18) breakpoint found in
most follicular B-cell lymphomas and some diffuse large-cell lymphomas.
Bcl-2 is unique among proto-oncogenes, being localized to mitochondria and
extending cell survival by blocking programmed cell death. We examined
Bcl-2 protein expression in 82 hematologic malignancies and reactive
lymphoid processes. All lymphomas with Bcl-2 rearrangement demonstrated
high levels of Bcl-2 protein. However, most follicular and diffuse
lymphomas without Bcl-2 rearrangement also displayed intense Bcl-2
staining. In these cases, mechanisms other than classic translocation may
be deregulation Bcl-2. The pattern of Bcl-2 staining in follicular lymphoma
is the inverse of the pattern in reactive hyperplasia, confirming a role
for Bcl-2 immunolocalization in routine diagnosis. Small lymphocytic
malignancies, including small lymphocytic lymphoma, mantle zone lymphoma,
and chronic lymphocytic leukemia, expressed intermediate levels of Bcl-2.
Bcl-2 protein varied in plasma cell dyscrasias. Bcl-2 protein levels in
T-cell lymphomas reflected their corresponding stage of development. No
substantial Bcl- 2 was present in the Reed-Sternberg cells of nodular
sclerosing Hodgkin's disease. Chronic myelogenous leukemia was strongly
positive for Bcl-2, consistent with the presence of Bcl-2 in normal myeloid
progenitors. Immunohistochemistry identified an expanded spectrum of
hematopoietic neoplasms in which Bcl-2 may provide a cell survival
advantage.
Volume 78,
Issue 4,
pp. 1062-1068,
08/15/1991
Copyright © 1991 by The American Society of Hematology

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