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Published online before print March 24, 2006
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© by The Society for Leukocyte Biology
Journal of Leukocyte Biology, doi:10.1189/jlb.1105693

Received for publication November 28, 2005.
Revised January 15, 2006.
Accepted for publication February 14, 2006.

Article

RGS1 and RGS13 mRNA silencing in a human B lymphoma line enhances responsiveness to chemoattractants and impairs desensitization

Jang-Il Han , Ning-Na Huang , Dong-Uk Kim , and John H. Kehrl @

Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland

@ To whom correspondence should be addressed. E-mail: jkehrl{at}niaid.nih.gov.


  Abstract

Chemokines bind receptors that are members of the G-protein-coupled receptor family. Chemokine receptors transduce intracellular signals by activating heterotrimeric G-proteins. Acting to limit and modulate heterotrimeric G-protein signaling is a family of proteins, termed regulator of G-protein signaling (RGS). Two of these proteins, RGS1 and RGS13, are well-expressed in germinal center B cells and many Burkitt’s lymphoma cell lines. Reducing RGS13 and to a lesser extent RGS1 expression in a Burkitt’s lymphoma cell line enhances responsiveness to two chemokines, CXC chemokine ligand 12 (CXCL12) and CXCL13, and reducing both mRNAs augments the responses more dramatically. The double knock-down (KD) cells respond better to restimulation with CXCL12 or CXCL13 after a primary stimulation with CXCL12 than do the control cells. The double-KD cells also exhibit a greater propensity to polarize and to develop multiple small lamellipodia. These results indicate that RGS1 and RGS13 act together to regulate chemokine receptor signaling in human germinal center B lymphocytes and provide evidence that they contribute significantly to the rapid desensitization of the signaling pathway.

Key Words: B lymphocyte • calcium • chemokine




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