PKCα and PKCβ cooperate functionally in CD3-induced de novo IL-2 mRNA transcription.
Immunol Lett 2013;
151:31-8. [PMID:
23439007 PMCID:
PMC3641392 DOI:
10.1016/j.imlet.2013.02.002]
[Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 01/29/2013] [Accepted: 02/05/2013] [Indexed: 12/12/2022]
Abstract
The physiological functions of PKCα and PKCθ isotypes downstream of the antigen receptor have been defined in CD3(+) T cells. In contrast, no function of the second conventional PKC member, PKCβ, has been described yet in T cell antigen receptor signalling. To investigate the hypothesis that both conventional PKCα and PKCβ isotypes may have overlapping functions in T cell activation signalling, we generated mice that lacked the genes for both isotypes. We found that PKCα(-/-)/β(-/-) animals are viable, live normal life spans and display normal T cell development. However, these animals possess additive defects in T cell responses in comparison to animals that carry single mutations in these genes. Our studies demonstrate that the activities of PKCα and PKCβ converge to regulate IL-2 cytokine responses in anti-CD3 stimulated primary mouse T cells. Here, we present genetic evidence that PKCα and PKCβ cooperate in IL-2 transcriptional transactivation in primary mouse T cells independently of the actions of PKCθ.
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