Distinct regulation of integrin-dependent T cell conjugate formation and NF-kappa B activation by the adapter protein ADAP.
Following TCR stimulation, T cells utilize the hematopoietic specific adhesion and degranulation-promoting adapter protein (ADAP) to control both integrin adhesive function and NF-kappaB transcription factor activation. We have investigated the molecular basis by which ADAP controls these events in primary murine ADAP(-/-) T cells. Naive DO11.10/ADAP(-/-) T cells show impaired adhesion to OVAp (OVA aa 323-339)-bearing APCs that is restored following reconstitution with wild-type ADAP. Mutational analysis demonstrates that the central proline-rich domain and the C-terminal domain of ADAP are required for rescue of T:APC conjugate formation. The ADAP proline-rich domain is sufficient to bind and stabilize the expression of SKAP55 (Src kinase-associated phosphoprotein of 55 kDa), which is otherwise absent from ADAP(-/-) T cells. Interestingly, forced expression of SKAP55 in the absence of ADAP is insufficient to drive T:APC conjugate formation, demonstrating that both ADAP and SKAP55 are required for optimal LFA-1 function. Additionally, the ADAP proline-rich domain is required for optimal Ag-induced activation of CD69, CD25, and Bcl-x(L), but is not required for assembly of the CARMA1/Bcl10/Malt1 (caspase-recruitment domain (CARD) membrane-associated guanylate kinase (MAGUK) protein 1/B-cell CLL-lymphoma 10/mucosa-associated lymphoid tissue lymphoma translocation protein 1) signaling complex and subsequent TCR-dependent NF-kappaB activity. Our results indicate that ADAP is used downstream of TCR engagement to delineate two distinct molecular programs in which the ADAP/SKAP55 module is required for control of T:APC conjugate formation and functions independently of ADAP/CARMA1-mediated NF-kappaB activation.
Burbach
Brandon J
BJ
Department of Laboratory Medicine and Pathology, Masonic Cancer Center, University of Minnesota Medical School, Minneapolis, MN 55455, USA.
Srivastava
Rupa
R
Medeiros
Ricardo B
RB
O'Gorman
William E
WE
Peterson
Erik J
EJ
Shimizu
Yoji
Y
D048868:Adaptor Proteins, Signal Transducing / Q000096:biosynthesis / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D000256:Adenoviridae / Q000235:genetics / Q000276:immunology; D000818:Animals; D017951:Antigen Presentation / Q000235:genetics; D000938:Antigen-Presenting Cells / Q000276:immunology / Q000378:metabolism; D002448:Cell Adhesion / Q000235:genetics / Q000276:immunology; D002478:Cells, Cultured; D006801:Humans; D016023:Integrins / Q000502:physiology*; D019169:Jurkat Cells; D008213:Lymphocyte Activation / Q000235:genetics / Q000276:immunology; D008565:Membrane Proteins / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D018345:Mice, Knockout; D008822:Mice, Transgenic; D016328:NF-kappa B / Q000235:genetics / Q000378:metabolism*; D010047:Ovalbumin / Q000276:immunology / Q000378:metabolism; D010446:Peptide Fragments / Q000276:immunology / Q000378:metabolism; D010750:Phosphoproteins / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D055232:Proline-Rich Protein Domains / Q000502:physiology; D011991:Receptors, Virus / Q000096:biosynthesis / Q000235:genetics; D016176:T-Lymphocyte Subsets / Q000276:immunology* / Q000378:metabolism*
D048868:Adaptor Proteins, Signal Transducing; D016023:Integrins; D008565:Membrane Proteins; D016328:NF-kappa B; D010047:Ovalbumin; D010446:Peptide Fragments; D010750:Phosphoproteins; D011991:Receptors, Virus; C491468:Fyb protein, mouse; C111390:OVA 323-339; C514255:SKAP1 protein, mouse; C085301:adenovirus receptor
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