Calcium and integrin-binding protein 1 (CIB1)

Calcium-binding protein which plays a role in the regulation of many cellular processes, such as cell differentiation, cell division, cell proliferation, cell migration, thrombosis, angiogenesis, cardiac hypertrophy and apoptosis. Participates in the endomitotic cell cycle of megakaryocyte, a kind of mitosis in which both karyokinesis and cytokinesis are interrupted.

Plays a role in integrin signaling by negatively regulating alpha-IIb/beta3 activation in thrombin- stimulated megakaryocytes preventing platelet aggregation. Up- regulates PTK2/FAK1 activity, and is also required for the recruitment of PTK2/FAK1 to focal adhesions; it thus seems to play an important role in focal adhesion formation.