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The CD40 ligand, gp39, is defective in activated T cells from patients with X-linked hyper-IgM syndrome.

Authors: Aruffo, A  Farrington, M  Hollenbaugh, D  Li, X  Milatovich, A  Nonoyama, S  Bajorath, J  Grosmaire, LS  Stenkamp, R  Neubauer, M 
Citation: Aruffo A, etal., Cell. 1993 Jan 29;72(2):291-300.
Pubmed: (View Article at PubMed) PMID:7678782

The prominent role of the CD40 receptor in B cell responses led us to investigate the role of the gp39-CD40 interaction in a group of primary immunodeficient patients with defective antibody production. Here we report that patients with hyper-IgM syndrome (HIM) have a defective gp39-CD40 interaction. B cells from HIM patients express functional CD40, but their T cells do not bind CD40-Ig. These patients expressed normal levels of gp39 mRNA, but these mRNAs encode defective gp39 proteins owing to mutations in the extracellular domain of gp39. Soluble recombinant forms of gp39 containing these mutations were unable to bind CD40 and drive normal B cell proliferation. The gene encoding gp39 was mapped to Xq26, the X chromosome region where the gene responsible for HIM had previously been mapped. These data suggest that a defect in gp39 is the basis of X-linked HIM.


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RGD Object Information
RGD ID: 1599480
Created: 2007-02-06
Species: All species
Last Modified: 2007-02-06
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.