ORGANELLE MARKERS - Plasma membrane

CD40 Ligand

CD40 ligand (CD40L), also known as CD154, gp39 and TRAP, is a 33 kDa type II membrane glycoprotein expressed mainly on the cell surface of activated T lymphocytes but also exists as a soluble form extracellularly. CD40L is the ligand for CD40, a member of the TNF superfamily, which is expressed on the cell surface of B cells, macrophages/monocytes, dendritic cells, vascular endothelial cells, and epithelial cells. CD40L plays an important role in B cell proliferation, antibody class switching, modulation of apoptosis in the germinal center through interaction with B cells expressing CD40, and activation of CD4+ T cells. Mutation within the CD40L gene is linked to hyper IgM syndrome, an Xlinked immunodeficiency disease that is characterized by elevated level of serum IgM and decreased level of other isotypes.

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