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LFA‐1 integrin and the microtubular cytoskeleton are involved in the Ca 2 + ‐mediated regulation of the activity of the tyrosine kinase PYK2 in T cells
Author(s) -
RodríguezFernández José Luis,
SánchezMartín Lorena,
Frutos Cristina Alvarez,
Sancho David,
Robinson Martyn,
SánchezMadrid Francisco,
Cabañas Carlos
Publication year - 2002
Publication title -
journal of leukocyte biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.819
H-Index - 191
eISSN - 1938-3673
pISSN - 0741-5400
DOI - 10.1189/jlb.71.3.520
Subject(s) - microbiology and biotechnology , biology , integrin , cytoskeleton , lymphocyte function associated antigen 1 , actin cytoskeleton , microtubule organizing center , protein tyrosine phosphatase , intracellular , signal transduction , intercellular adhesion molecule 1 , biochemistry , receptor , cell , centrosome , cell cycle
Lymphocyte function‐associated antigen (LFA‐1) is a member of the β2 family of integrins that is selectively expressed on leukocytes. Herein, we show that Ca 2 + mobilizing agents A23187, thapsigargin, and ionomycin induce an increase in adhesion to the LFA‐1 ligand intercellular adhesion molecule‐1 (ICAM‐1) and activation and redistribution of the proline‐rich tyrosine kinase‐2 (PYK2) to the microtubule‐organizing center (MTOC) in T‐lymphoblasts. These effects are similar to those observed upon direct induction of activation of LFA‐1 with the stimulatory mAb KIM‐127. Most importantly, Ca 2 + mobilization did not induce activation of PYK2 when the LFA‐1/ICAM‐1 interaction was prevented with function‐blocking mAb, implying that the Ca 2 + ‐induced activation of PYK2 requires integrin engagement. Furthermore, pretreatment of the cells with the Ca 2 + chelator EGTA, which depletes the intracellular Ca 2 + , inhibited the effects of mAb KIM‐127 on cell morphology and PYK2 activation. This inhibition with EGTA was not reversed by cross‐linking integrin LFA‐1 with specific antibodies, indicating that Ca 2 + exerts its effects through a target downstream of this integrin. In this regard, immunofluorescence and Western blot analysis showed that Ca 2 + chelators affect the organization of the microtubular cytoskeleton and the localization of PYK2 to the MTOC area, suggesting that these agents could inhibit the activation of PYK2 by interfering with the microtubular network of T cells. Taken together, our results demonstrate for the first time an important role for the integrin LFA‐1 and the microtubular cytoskeleton in the Ca 2 + ‐mediated activation of PYK2 in T‐lymphocytes.