Soluble CD40 Ligand/TRAP (msCD40L) Mouse Active Protein

CD40LG: Mediates B-cell proliferation in the absence of co- stimulus as well as IgE production in the presence of IL-4. Involved in immunoglobulin class switching. Defects in CD40LG are the cause of X-linked immunodeficiency with hyper-IgM type 1 (HIGM1); also known as X-linked hyper IgM syndrome (XHIM). HIGM1 is an immunoglobulin isotype switch defect characterized by elevated concentrations of serum IgM and decreased amounts of all other isotypes. Affected males present at an early age (usually within the first year of life) recurrent bacterial and opportunistic infections, including Pneumocystis carinii pneumonia and intractable diarrhea due to cryptosporidium infection. Despite substitution treatment with intravenous immunoglobulin, the overall prognosis is rather poor, with a death rate of about 10% before adolescence. Belongs to the tumor necrosis factor family.

Protein type: Membrane protein, integral; Cell adhesion

Cellular Component: extracellular space; cell surface; membrane; cell; plasma membrane; integral to membrane; extracellular region; external side of plasma membrane

Molecular Function: cytokine activity; CD40 receptor binding; tumor necrosis factor receptor binding

Biological Process: B cell proliferation; platelet activation; positive regulation of interleukin-12 production; isotype switching; positive regulation of immune response to tumor cell; signal transduction; positive regulation of interleukin-10 production; positive regulation of interferon-gamma production; positive regulation of MHC class II biosynthetic process; B cell differentiation; immunoglobulin secretion; positive regulation of B cell proliferation; immune response; inflammatory response; regulation of immunoglobulin secretion; negative regulation of apoptosis