Rapid induction of the Grp78 gene by cooperative actions of okadaic acid and heat-shock in 9L rat brain tumor cells--involvement of a cAMP responsive element-like promoter sequence and a protein kinase A signaling pathway.
We have demonstrated that treatment with 200 nM okadaic acid (OA) for 1 h followed by a 15-min heat shock (HS) at 45 degrees C (termed OA-->HS treatment) leads to a rapid transactivation of grp78, the gene for the 78-kDa glucose-regulated protein, in 9L rat brain tumor cells. The level of Grp78 mRNA rose 15-fold in 60 min after the combined treatment. Nuclear extracts from cells subjected to OA-->HS treatment, compared to those of treatment with OA or HS alone, exhibited an increased binding activity toward an oligonucleotide probe containing the cAMP-responsive element-like (CRE-like, TGACGTGA) regulatory element in electrophoretic mobility shift assays (EMSA). The binding resulted in the formation of two protein-EMSA probe complexes exhibiting different association and dissociation rates in kinetic studies. The protein factors in the upper band (complex I) and lower band (complex II) were identified as the activating transcription factor-2 (ATF-2) and the CRE binding factor 1 (CREB-1), respectively, by antibody interference assays. In addition, the identity of CREB-1 was confirmed by supershift analysis. The binding activity, as well as the transactivation of the grp78 gene, can be abolished by a 1-h treatment with the cAMP-dependent protein kinase (PKA) inhibitor but not with protein kinase C or Ca2+/calmodulin-dependent protein kinase II inhibitors. Accumulation of steady-state level of ATF-2 was observed and was also modulated by treatment with H-89, a PKA inhibitor. From these results, we conclude that the CRE-like element plays an important role in the rapid transactivation of the grp78 gene and that the PKA signaling pathway is involved. In addition, PKA-mediated transcriptional regulation of grp78 in OA-->HS treatment is through regulation of protein phosphorylation as well as de novo synthesis of ATF-2.
Chen
K D
KD
Department of Life Science, National Tsing Hua University, Hsinchu, Taiwan, Republic of China.
Hung
J J
JJ
Huang
H L
HL
Chang
M D
MD
Lai
Y K
YK
D051697:Activating Transcription Factor 1; D051698:Activating Transcription Factor 2; D000818:Animals; D001483:Base Sequence; D001932:Brain Neoplasms / Q000235:genetics / Q000378:metabolism; D002352:Carrier Proteins / Q000235:genetics*; D000242:Cyclic AMP / Q000378:metabolism; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism; D017868:Cyclic AMP-Dependent Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D017931:DNA Primers / Q000235:genetics; D004268:DNA-Binding Proteins; D000091342:Endoplasmic Reticulum Chaperone BiP; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006360:Heat-Shock Proteins; D006358:Hot Temperature; D007546:Isoquinolines / Q000494:pharmacology; D018832:Molecular Chaperones / Q000235:genetics*; D019319:Okadaic Acid / Q000494:pharmacology*; D010766:Phosphorylation; D016133:Polymerase Chain Reaction; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012334:RNA, Neoplasm / Q000235:genetics / Q000378:metabolism; D051381:Rats; D015398:Signal Transduction; D013449:Sulfonamides; D014157:Transcription Factors / Q000378:metabolism; D015533:Transcriptional Activation / Q000187:drug effects; D014407:Tumor Cells, Cultured
D051697:Activating Transcription Factor 1; D051698:Activating Transcription Factor 2; C497107:Atf2 protein, rat; D002352:Carrier Proteins; D017362:Cyclic AMP Response Element-Binding Protein; D017931:DNA Primers; D004268:DNA-Binding Proteins; D000091342:Endoplasmic Reticulum Chaperone BiP; D004791:Enzyme Inhibitors; D006360:Heat-Shock Proteins; D007546:Isoquinolines; D018832:Molecular Chaperones; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D013449:Sulfonamides; D014157:Transcription Factors; D019319:Okadaic Acid; D000242:Cyclic AMP; D017868:Cyclic AMP-Dependent Protein Kinases; C063509:N-(2-(4-bromocinnamylamino)ethyl)-5-isoquinolinesulfonamide