Role for the Abi/wave protein complex in T cell receptor-mediated proliferation and cytoskeletal remodeling.
Curr Biol
; 16(1): 35-46, 2006 Jan 10.
Article
em En
| MEDLINE
| ID: mdl-16401422
ABSTRACT
BACKGROUND:
The molecular reorganization of signaling molecules after T cell receptor (TCR) activation is accompanied by polymerization of actin at the site of contact between a T cell and an antigen-presenting cell (APC), as well as extension of actin-rich lamellipodia around the APC. Actin polymerization is critical for the fidelity and efficiency of the T cell response to antigen. The ability of T cells to polymerize actin is critical for several steps in T cell activation including TCR clustering, mature immunological synapse formation, calcium flux, IL-2 production, and proliferation. Activation of the Rac GTPase has been linked to regulation of actin polymerization after TCR stimulation. However, the molecules required for TCR-mediated actin polymerization downstream of activated Rac have remained elusive. Here we identify a novel role for the Abi/Wave protein complex, which signals downstream of activated Rac, in the regulation of actin polymerization and T cell activation in response to TCR stimulation.RESULTS:
Here we show that Abi and Wave rapidly translocate from the T cell cytoplasm to the T cellB cell contact site in the presence of antigen. Abi and Wave colocalize with actin at the T cellB cell conjugation site. Moreover, Wave and Abi are necessary for actin polymerization after T cell activation, and loss of Abi proteins in mice impairs TCR-induced cell proliferation and IL-2 production in primary T cells. Significantly, the impairment in actin polymerization in cells lacking Abi proteins is due to the inability of Wave proteins to localize to the T cellB cell contact site in the presence of antigen, rather than the destabilization of the components of the Wave protein complex.CONCLUSIONS:
The Abi/Wave complex is a novel regulator of TCR-mediated actin dynamics, IL-2 production, and proliferation.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Citoesqueleto
/
Receptores de Antígenos de Linfócitos T
/
Linfócitos T
/
Proteínas Adaptadoras de Transdução de Sinal
/
Família de Proteínas da Síndrome de Wiskott-Aldrich
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Curr Biol
Assunto da revista:
BIOLOGIA
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Estados Unidos