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 Blood, 11 June 2009, Vol. 113, No. 24, pp. 6128-6137.
Prepublished online as a Blood First Edition Paper on February 3, 2009; DOI 10.1182/blood-2008-10-182329.

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IMMUNOBIOLOGY

Cytoskeletal protein 4.1R negatively regulates T-cell activation by inhibiting the phosphorylation of LAT

Qiaozhen Kang1,*, Yu Yu1,*, Xinhong Pei1,*, Richard Hughes1,*, Susanne Heck2, Xihui Zhang1, Xinhua Guo1, Gregory Halverson3, Narla Mohandas1, and Xiuli An1,4

1 Red Cell Physiology Laboratory, 2 Flow Cytometry Core, and 3 Immunochemistry, New York Blood Center, New York, NY; and 4 Department of Biophysics, Health Science Center, Peking University, Beijing, People's Republic of China

Protein 4.1R (4.1R) was first identified in red cells where it plays an important role in maintaining mechanical stability of red cell membrane. 4.1R has also been shown to be expressed in T cells, but its function has been unclear. In the present study, we use 4.1R-deficient mice to explore the role of 4.1R in T cells. We show that 4.1R is recruited to the immunologic synapse after T cell–antigen receptor (TCR) stimulation. We show further that CD4+ T cells of 4.1R–/– mice are hyperactivated and that they displayed hyperproliferation and increased production of interleukin-2 (IL-2) and interferon {gamma} (IFN{gamma}). The hyperactivation results from enhanced phosphorylation of LAT and its downstream signaling molecule ERK. The 4.1R exerts its effect by binding directly to LAT, and thereby inhibiting its phosphorylation by ZAP-70. Moreover, mice deficient in 4.1R display an elevated humoral response to immunization with T cell–dependent antigen. Thus, we have defined a hitherto unrecognized role for 4.1R in negatively regulating T-cell activation by modulating intracellular signal transduction.


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Related Article in Blood Online:

4.1R: a FERM player at the immunologic synapse
Judy L. Cannon
Blood 2009 113: 6043-6044. [Full Text] [PDF]



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J. L. Cannon
4.1R: a FERM player at the immunologic synapse
Blood, June 11, 2009; 113(24): 6043 - 6044.
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