title: Regulation of genotoxic stress response by homeodomain-interacting protein kinase 2 through phosphorylation of cyclic AMP response element-binding protein at serine 271.
abstract: CREB (cyclic AMP response element-binding protein) is a stimulus-induced transcription factor that plays pivotal roles in cell survival and proliferation. The transactivation function of CREB is primarily regulated through Ser-133 phosphorylation by cAMP-dependent protein kinase A (PKA) and related kinases. Here we found that homeodomain-interacting protein kinase 2 (HIPK2), a DNA-damage responsive nuclear kinase, is a new CREB kinase for phosphorylation at Ser-271 but not Ser-133, and activates CREB transactivation function including brain-derived neurotrophic factor (BDNF) mRNA expression. Ser-271 to Glu-271 substitution potentiated the CREB transactivation function. ChIP assays in SH-SY5Y neuroblastoma cells demonstrated that CREB Ser-271 phosphorylation by HIPK2 increased recruitment of a transcriptional coactivator CBP (CREB binding protein) without modulation of CREB binding to the BDNF CRE sequence. HIPK2-/- MEF cells were more susceptible to apoptosis induced by etoposide, a DNA-damaging agent, than HIPK2+/+ cells. Etoposide activated CRE-dependent transcription in HIPK2+/+ MEF cells but not in HIPK2-/- cells. HIPK2 knockdown in SH-SY5Y cells decreased etoposide-induced BDNF mRNA expression. These results demonstrate that HIPK2 is a new CREB kinase that regulates CREB-dependent transcription in genotoxic stress.
authors.affiliation: Department of Environmental and Molecular Toxicology, North Carolina State University, Raleigh, NC 27695, USA.
authors.forename: Kensuke
authors.initials: K
authors.lastname: Sakamoto
authors.forename: Bo-Wen
authors.initials: BW
authors.lastname: Huang
authors.forename: Kenta
authors.initials: K
authors.lastname: Iwasaki
authors.forename: Kiros
authors.initials: K
authors.lastname: Hailemariam
authors.forename: Jun
authors.initials: J
authors.lastname: Ninomiya-Tsuji
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Tsuji
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology; D015153:Blotting, Western; D019208:Brain-Derived Neurotrophic Factor / Q000235:genetics / Q000378:metabolism; D050882:CREB-Binding Protein / Q000235:genetics / Q000378:metabolism; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D002478:Cells, Cultured; D017362:Cyclic AMP Response Element-Binding Protein / Q000235:genetics / Q000378:metabolism*; D004249:DNA Damage; D004622:Embryo, Mammalian / Q000166:cytology; D005047:Etoposide / Q000494:pharmacology; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D057809:HEK293 Cells; D006801:Humans; D020014:K562 Cells; D051379:Mice; D018345:Mice, Knockout; D010766:Phosphorylation; D011485:Protein Binding; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D034622:RNA Interference; D012694:Serine / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic / Q000187:drug effects; D020798:Two-Hybrid System Techniques
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D019208:Brain-Derived Neurotrophic Factor; D002352:Carrier Proteins; D017362:Cyclic AMP Response Element-Binding Protein; D012694:Serine; D005047:Etoposide; D050882:CREB-Binding Protein; C115114:HIPK2 protein, human; D017346:Protein Serine-Threonine Kinases