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Protein kinase C-associated kinase (PKK)/receptor interacting protein 4 (RIP4) is a protein kinase C (PKC) beta-associated kinase that links PKC to NF-kappaB activation. The kinase domain of PKK is similar to that of RIP, RIP2, and RIP3. We show in this study that PKK is expressed early during lymphocyte development and can be detected in common lymphoid progenitor cells. Targeting of a catalytically inactive version of PKK to lymphoid cells resulted in a marked impairment in pro-B cell generation in the bone marrow. Although peripheral B cell numbers were markedly reduced, differentiation into follicular and marginal zone B cells was not defective in these mice. B-1a and B-1b B cells could not be detected in these mice, but this might be a reflection of the overall defect in B cell production observed in these animals. In keeping with a possible link to PKCbeta, peripheral B cells in these mice exhibit a defect in anti-IgM-mediated proliferation. These studies suggest that PKK may be required early in B cell development and for BCR-mediated B cell proliferation.

the journal of immunology/the journal of immunology

A Catalytically Inactive Form of Protein Kinase C-Associated Kinase/Receptor Interacting Protein 4, a Protein Kinase Cβ-Associated Kinase That Mediates NF-κB Activation, Interferes with Early B Cell Development