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HIPK2 Regulates Transforming Growth Factor-ß-Induced c-Jun NH₂-Terminal Kinase Activation and Apoptosis in Human Hepatoma Cells

¹ Heinrich-Pette-Institut für Experimentelle Virologie und Immunologie an der Universität Hamburg, Hamburg, Germany, and
² Departement für Chemie und Biochemie, Universität Bern, Bern, Switzerland

Homeodomain-interacting protein kinase 2 (HIPK2) is a serine/threonine kinase involved in transcriptional regulation and apoptosis. Here we demonstrate that HIPK2 regulates transforming growth factor (TGF) ß-induced c-Jun NH₂-terminal kinase (JNK) activation and apoptosis. HIPK2 colocalizes with Daxx, a protein acting in TGF-ß-induced JNK activation and apoptosis, in promyelocytic leukemia (PML) nuclear bodies, and triggers PML-nuclear body disruption and release of Daxx. HIPK2 interacts in vitro and in vivo via its kinase domain with Daxx, and a fraction of Daxx coprecipitates with HIPK2 under physiological conditions. Moreover, overexpression of HIPK2 leads to Daxx phosphorylation, and ectopic expression of HIPK2 activates the JNK signaling pathway, which is enhanced by coexpression of Daxx. HIPK2 signals to JNK via a pathway using Daxx and the mitogen-activated protein kinase kinases MKK4/SEK1 and MKK7. Ectopic expression of HIPK2 and Daxx potentiates TGF-ß-induced apoptosis in human p53-deficient hepatocellular carcinoma cells. Finally, we demonstrate that knockdown of endogenous HIPK2 using RNA interference inhibits TGF-ß-induced JNK activation and apoptosis. Taken together, our findings indicate that HIPK2 participates in the TGF-ß signaling pathway leading to JNK activation and apoptosis.

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