TCR/CD3 is a complex of eight subunits that after antigen stimulation initiates a series of biochemical processes in the T cell leading to changes in cell activity . Performing the appropriate effector functions by T cells allows the specific structure in which there are two functionally distinct parts: the polymorphic region , used to recognize a specific antigen receptor ( TCR) , and a region highly conservative in signal transduction mediated T cell activation ( CD3 complex ) .

Protein p27 , belonging to the family of inhibitors of cyclin-dependent kinase called CIP / KIP , is currently the subject of intensive research in the field of cell biology and pathomechanisms of proliferative processes , because it not only controls the cell cycle by regulating the activity of CDK -cyclin complexes , but also participates in the induction apoptosis. P27 regulates the activity of CDK -cyclin holoenzymów in two ways. First, it inhibits the kinase activity of the complexes .

Molecular mechanisms of T-cell activation signal transduction to the nucleus.

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