A CD40 Signalosome anchored in lipid rafts leads to constitutive activation of NF-kappaB and autonomous cell growth in B cell lymphomas

B cell lineage non-Hodgkin's lymphomas (NHL-B) are neoplastic B cells that show dysregulated B lymphocyte growth characteristics. Unlike normal B cells, aggressive NHL-B cells show constitutive expression of nuclear NF-kappaB by maintaining an assembled, scaffold-like signaling platform, called...

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Bibliographic Details
Published in:Immunity (Cambridge, Mass.) Mass.), 2002-01, Vol.16 (1), p.37-50
Main Authors: Pham, Lan V, Tamayo, Archito T, Yoshimura, Linda C, Lo, Piao, Terry, Nicholas, Reid, Pamela S, Ford, Richard J
Format: Article
Language:English
Subjects:
CD40 Antigens - analysis
CD40 Antigens - physiology
CD40 Ligand - analysis
Cell Death
Cell Division
Humans
Lymphoma, B-Cell - metabolism
Lymphoma, B-Cell - pathology
Lymphoma, B-Cell - therapy
Membrane Microdomains - physiology
NF-kappa B - metabolism
Tumor Cells, Cultured
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Summary:B cell lineage non-Hodgkin's lymphomas (NHL-B) are neoplastic B cells that show dysregulated B lymphocyte growth characteristics. Unlike normal B cells, aggressive NHL-B cells show constitutive expression of nuclear NF-kappaB by maintaining an assembled, scaffold-like signaling platform, called a Signalosome within the lipid raft microdomain, extending from the cell membrane. The CD40 Signalosome appears to be initiated through autochthonous production and cognate binding of CD154 (CD40L, gp39) to CD40 by the lymphoma cell. Constitutive expression of NF-kappaB in NHL-B can be downregulated by treatment with antibodies to CD40 or CD154 that disrupt Signalosomes, inhibit lymphoma cell growth, and induce cell death. CD40 Signalosomes may provide a potentially vulnerable target for therapeutic intervention in NHL-B cells.
ISSN:1074-7613