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Homotypic cell aggregation via conformational change of CD44 molecule induced by anti-CD44 monoclonal antibodies.

Abstract：

:The homotypic cell aggregation of leukocytes is an unique adhesive event which is caused by cellular activation. Anti-CD44 monoclonal antibody (mAb) induces homotypic cell aggregation of hematopoietic cell lines expressing CD44, but the mechanism of homotypic cell aggregation is poorly understood. We used four mAbs against CD44: TL-1 which was newly developed and seemed to react with a non-hyaluronate binding site, OS/37 and BU52 which recognized a hyaluronate binding site, and Hermes-3 which recognized a non-hyaluronate binding site. TL-1 treatment induced strong homotypic cell aggregation in several types of cell lines including a B cell line from a patient with leukocyte adhesion deficiency syndromes (LAD) and normal peripheral blood lymphocytes (PBL). OS/37 and BU52 also induced weak homotypic cell aggregation. None of these anti-CD44 mAbs-induced homotypic cell aggregations was blocked by antibodies against LFA-1, ICAM-1, VLA-4, or L-selectin. Interestingly, the TL-1-induced homotypic cell aggregation was blocked by Hermes-3 or OS/37, but not by BU52. BU52-induced homotypic cell aggregation was blocked by Hermes-3 or OS/37, but not by TL-1. OS/37-induced homotypic cell aggregation was blocked by Hermes-3, TL-1 or BU52. The blocking experiments with anti-metabolic agents revealed that the induced homotypic cell aggregation was energy-dependent and associated with intracytoplasmic actin filaments. This homotypic cell aggregation did not require de novo protein synthesis, because it was not affected by pretreatment with either cycloheximide or actinomycin D. FACS analysis revealed that TL-1 binding did not affect the intensity of expression of the CD44 molecule on the cell surface.

journal_name

Immunobiology

journal_title

Immunobiology

authors

Cao L,Yoshino T,Nishiuchi R,Yamadori I,Akagi T

doi

10.1016/S0171-2985(11)80152-X

subject

Has Abstract

pub_date

1995-06-01 00:00:00

pages

1-14

issue

1

eissn

0171-2985

issn

1878-3279

pii

S0171-2985(11)80152-X

journal_volume

193

pub_type

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