Signal transduction through the B cell antigen receptor is normal in ataxia-telangiectasia B lymphocytes

Peter Speck, Masato Ikeda, Akiko Ikeda, Howard M. Lederman, Richard Longnecker

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The rare human genetic disorder ataxia-telangiectasia (A-T) has multiple consequences including a variable degree of immunodeficiency. Khanna and co-workers (Khanna, K. K., Yan, J., Watters, D., Hobson, K., Beamish, H., Spring, K., Shiloh, Y., Gatti, R. A., and Lavin, M. F. (1997) J. Biol. Chem. 272, 9489-9495) evaluated signaling in Epstein-Barr virus (EBV) immortalized A-T lymphoblastoid cell lines (LCLs), derived from the B cells of A-T patients. They showed that A-T lymphoblastoid cells lack signaling through the B cell antigen receptor and concluded that the fault in A-T encompasses intracellular signaling in B cells. However, it is established that EBV latent membrane protein 2A (LMP2A) blocks signaling in EBV-bearing cells by interaction with cellular tyrosine kinases. To test whether the reported fault in A-T B cells was not inherent in A-T but the result of influence of wild-type EBV, we derived A-T LCLs with wild-type or LMP2A-deleted EBV and studied signaling in these cells in response to cross-linking the B cell antigen receptor. We report that intracellular calcium mobilization and tyrosine phosphorylation in LMP2A-depleted LCLs derived from A-T patients is indistinguishable from that in LMP2A-depleted LCLs derived from normal controls. Further, signaling is blocked similarly in A-T and normal lymphoblastoid cells bearing wild-type EBV. In conclusion there is no evidence of any defect in B cell receptor signal transduction in A-T B cells.

Original languageEnglish (US)
Pages (from-to)4123-4127
Number of pages5
JournalJournal of Biological Chemistry
Issue number6
StatePublished - Feb 8 2002
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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