In A20 cells, PF-431396 blocks anti-Ig- and clustering LFA-1-induced tyrosine phosphorylation of Pyk2 and FAK, and further blocks B cell spreading. PF-431396 consistently inhibits the increase in protein tyrosine phosphorylation (PY) induced by the absence of added calcium and induced by W-7 in the presence of calcium. 在A20细胞中,PF-431396阻断抗Ig-和聚集的LFA-1诱导的Pyk2与 FAK的酪氨酸磷酸化,并进一步阻断B细胞扩散。 PF-431396连续抑制增钙缺乏诱导的和钙存在下W-7诱导的蛋白质酪氨酸酶磷酸化(PY)。