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Updated: Aug 8, 2026

Generation of Human CD40-activated B cells
Published on: October 17, 2009
Chromosomal localization of the gene for human B-cell antigen CD40
N Ramesh1, V Ramesh, J F Gusella
1Division of Immunology, Children's Hospital, Boston, Massachusetts.
Abstract:
CD40 is a surface glycoprotein expressed on all human B lymphocytes and plays an important role in B-cell development, growth, and differentiation. Anti-CD40 monoclonal antibodies cause isotype switching in B cells treated with IL-4. CD40 is a member of a family of proteins that include low-affinity nerve growth factor receptor, TNF receptor, and the antigen Fas. The ligand for CD40 had been recently identified and has been assigned to the X chromosome. Using a panel of human-rodent somatic cell hybrids, we now show that CD40 maps to human chromosome 20.
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