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Journal Article
Research Support, Non-U.S. Gov't
Protein kinase C-associated kinase is required for NF-kappaB signaling and survival in diffuse large B-cell lymphoma cells.
Blood 2008 Februrary 2
Diffuse large B-cell lymphoma (DLBCL) is an aggressive and the most common type of non-Hodgkin lymphoma. Despite recent advances in treatment, less than 50% of the patients are cured with current multiagent chemotherapy. Abnormal NF-kappaB activity not only contributes to tumor development but also renders cancer cells resistant to chemotherapeutic agents. Identifying and targeting signaling molecules that control NF-kappaB activation in cancer cells may thus yield more effective therapy for DLBCL. Here, we show that while overexpression of protein kinase C-associated kinase (PKK) activates NF-kappaB signaling in DLBCL cells, suppression of PKK expression inhibits NF-kappaB activity in these cells. In addition, we show that NF-kappaB activation induced by B cell-activating factor of tumor necrosis factor family (BAFF) in DLBCL cells requires PKK. Importantly, we show that knockdown of PKK impairs the survival of DLBCL cells in vitro and inhibits tumor growth of xenografted DLBCL cells in mice. Suppression of PKK expression also sensitizes DLBCL cells to treatment with chemotherapeutic agents. Together, these results indicate that PKK plays a pivotal role in the survival of human DLBCL cells and represents a potential target for DLBCL therapy.
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