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M9480581.TXT
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1994-08-20
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Document 0581
DOCN M9480581
TI Down-regulation of membrane immunoglobulin-associated proteins, MB-1,
B29 and Lyn, in AIDS-lymphomas and related conditions.
DT 9410
AU Mori S; Takanashi M; Shiota M; Choi SH; Yamanashi Y; Watanabe T; Koike
M; Department of Pathology, University of Tokyo, Japan.
SO Virchows Arch. 1994;424(5):553-61. Unique Identifier : AIDSLINE
MED/94305722
AB B-lymphocytes infected with Epstein-Barr virus (EBV) can proliferate in
immunocompromised hosts to form lymphomas (MLs). Similar MLs are
produced in mice with severe combined immune deficiency (SCID) by
transfusion of human lymphocytes infected with EBV (SCID-EBV-positive
BML). Mb-1 and B29 are recently found transmembrane proteins associated
with membrane immunoglobulins (mIg) on the surface of B cells. Lyn is a
src family gene product expressed in B cells submembranously, in
association with mIg, possibly through Mb-1/B29 heterodimer. These
mIg-associated proteins (Mb-1, B29 and Lyn) are known to mediate
antigenic stimulation through mIgs. We noted recently that Lyn is
decreased selectively in around a half of SCID-EBV-positive BMLs. We
extended this line of investigation to other mIg-associated proteins.
Five acquired immunodeficiency syndrome (AIDS)-MLs and ten
SCID-EBV-positive BMLs were first analysed by immunohistochemistry for
the expression of Mb-1, B29 and Lyn. It was found that in AIDS-MLs, all
the mIg-associated proteins were heavily down-regulated. In
SCID-EBV-positive BMLs, Mb-1 was down regulated in six of ten, B29 in
nine of ten and Lyn in six of ten, whereas no down-regulation was noted
in eight EBV-free B MLs that were also maintained in SCID mice. An
additional flow-cytometric study of two SCID-EBV-positive and two
EBV-negative BMLs showed similar down-regulation in the former cases
exclusively. Whereas mIg was also decreased in three of five SCID-EBV
positive BMLs, it did not necessarily match the decrease of
mIg-associated proteins, which contrasts with the recent finding that
mIgs coexist with Mb-1 or B29. Some EBV-encoded proteins may activate
host molecules located downwardly; this, in turn, may lead to the
suppression of these upwardly-located mIg-associated proteins.
DE Adult Animal *Down-Regulation (Physiology) *Herpesvirus 4, Human
Human Lymphoma, AIDS-Related/*METABOLISM/PATHOLOGY Lymphoma,
B-Cell/METABOLISM/PATHOLOGY Male Membrane Glycoproteins/*METABOLISM
Mice Mice, SCID Phosphoproteins/*METABOLISM Protein-Tyrosine
Kinase/*METABOLISM Receptors, Antigen, B-Cell/*METABOLISM Support,
Non-U.S. Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).