Activation and induction of Nur77/Nurr1 in corticotrophs by CRH/cAMP: Involvement of calcium, protein kinase a, and MAPK pathways

Nur factors are critical for proopiomelanocortin (POMC) induction by CRH in corticotrophs, but the pathways linking CRH to Nur are unknown. In this study we show that in AtT-20 corticotrophs CRH and cAMP induce Nur77 and Nurr1 expression and transcription at the NurRE site by protein kinase A (PKA)...

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Autor principal: Kovalovsky, D.
Otros Autores: Refojo, D., Liberman, A.C, Hochbaum, D., Pereda, M.P, Coso, O.A, Stalla, G.K, Holsboer, F., Arzt, E.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2002
Acceso en línea:Registro en Scopus
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LEADER 18038caa a22016097a 4500
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024 7 |2 scopus  |a 2-s2.0-0036018997 
024 7 |2 cas  |a Calcium Channel Blockers; Calcium, 7440-70-2; Corticotropin-Releasing Hormone, 9015-71-8; Cyclic AMP, 60-92-4; Cyclic AMP-Dependent Protein Kinases, EC 2.7.1.37; DNA-Binding Proteins; ets-domain protein elk-1; MAP Kinase Signaling System; Nifedipine, 21829-25-4; Nurr1 nuclear receptor; orphan nuclear receptor NGFI-B, 121479-42-3; Pro-Opiomelanocortin, 66796-54-1; Proto-Oncogene Proteins; Transcription Factors 
040 |a Scopus  |b spa  |c AR-BaUEN  |d AR-BaUEN 
030 |a MOENE 
100 1 |a Kovalovsky, D. 
245 1 0 |a Activation and induction of Nur77/Nurr1 in corticotrophs by CRH/cAMP: Involvement of calcium, protein kinase a, and MAPK pathways 
260 |c 2002 
270 1 0 |m Arzt, E.; Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria (1428), Buenos Aires, Argentina; email: earzt@bg.fcen.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a Nur factors are critical for proopiomelanocortin (POMC) induction by CRH in corticotrophs, but the pathways linking CRH to Nur are unknown. In this study we show that in AtT-20 corticotrophs CRH and cAMP induce Nur77 and Nurr1 expression and transcription at the NurRE site by protein kinase A (PKA) and calcium-dependent and -independent mechanisms. Calcium pathways depend on calmodulin kinase II (CAMKII) activity, and calcium-independent pathways are accounted for in part by MAPK activation (Rap1/B-Raf/MAPK-ERK kinase/ERK1/2), demonstrated by the use of molecular and pharmacological tools. ATT-20 corticotrophs express B-Raf, as do other cells in which cAMP stimulates MAPK. CRH/cAMP stimulated ERK2 activity and increased transcriptional activity of a Gal4-Elk1 protein, which was blocked by overexpression of dominant negative mutants and kinase inhibitors and stimulated by expression of B-Raf. The MAPK kinase inhibitors did not affect Nur77 and Nurr1 mRNA induction but blocked CRH or cAMP-stimulated Nur transcriptional activity. Moreover, MAPK stimulated phosphorylation and transactivation of Nur77. The functional impact of these pathways was confirmed at the POMC promoter. In conclusion, in AtT-20 corticotrophs the CRH/cAMP signaling that leads to Nur77/Nurr1 mRNA induction and transcriptional activation, and thus POMC expression, is dependent on protein kinase A and involves calcium/calmodulin kinase II (Nur induction/activation) and MAPK calcium-dependent and -independent (Nur phosphorylation-activation) pathways.  |l eng 
593 |a Laboratorio de Fisiología y Biología Molecular, Departamento de Biología, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina 
593 |a Max Planck Institute of Psychiatry, 80804 Munich, Germany 
593 |a Laboratorio de Fisiología y Biología Molecular, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria (1428), Buenos Aires, Argentina 
690 1 0 |a CORTICOSTEROID RECEPTOR 
690 1 0 |a CYCLIC AMP DEPENDENT PROTEIN KINASE 
690 1 0 |a MITOGEN ACTIVATED PROTEIN KINASE 
690 1 0 |a PROOPIOMELANOCORTIN 
690 1 0 |a PROTEIN KINASE (CALCIUM,CALMODULIN) 
690 1 0 |a ANIMAL CELL 
690 1 0 |a ARTICLE 
690 1 0 |a CELL TYPE 
690 1 0 |a CORTICOTROPIN RELEASE 
690 1 0 |a ENZYME ACTIVATION 
690 1 0 |a ENZYME INDUCTION 
690 1 0 |a GENE OVEREXPRESSION 
690 1 0 |a HYPOTHALAMUS HYPOPHYSIS ADRENAL SYSTEM 
690 1 0 |a NONHUMAN 
690 1 0 |a POINT MUTATION 
690 1 0 |a PRIORITY JOURNAL 
690 1 0 |a PROTEIN PHOSPHORYLATION 
690 1 0 |a STIMULUS RESPONSE 
690 1 0 |a STRESS 
690 1 0 |a TRANSCRIPTION REGULATION 
690 1 0 |a ANIMAL 
690 1 0 |a CALCIUM 
690 1 0 |a CALCIUM CHANNEL BLOCKERS 
690 1 0 |a CELLS, CULTURED 
690 1 0 |a CORTICOTROPIN-RELEASING HORMONE 
690 1 0 |a CYCLIC AMP 
690 1 0 |a CYCLIC AMP-DEPENDENT PROTEIN KINASES 
690 1 0 |a DNA-BINDING PROTEINS 
690 1 0 |a MAP KINASE SIGNALING SYSTEM 
690 1 0 |a MICE 
690 1 0 |a MUTATION 
690 1 0 |a NIFEDIPINE 
690 1 0 |a PHOSPHORYLATION 
690 1 0 |a PITUITARY GLAND 
690 1 0 |a PRO-OPIOMELANOCORTIN 
690 1 0 |a PROMOTER REGIONS (GENETICS) 
690 1 0 |a PROTO-ONCOGENE PROTEINS 
690 1 0 |a RESPONSE ELEMENTS 
690 1 0 |a SIGNAL TRANSDUCTION 
690 1 0 |a SUPPORT, NON-U.S. GOV'T 
690 1 0 |a TRANSCRIPTION FACTORS 
690 1 0 |a TRANSCRIPTION, GENETIC 
690 1 0 |a ANIMALIA 
700 1 |a Refojo, D. 
700 1 |a Liberman, A.C. 
700 1 |a Hochbaum, D. 
700 1 |a Pereda, M.P. 
700 1 |a Coso, O.A. 
700 1 |a Stalla, G.K. 
700 1 |a Holsboer, F. 
700 1 |a Arzt, E. 
773 0 |d 2002  |g v. 16  |h pp. 1638-1651  |k n. 7  |p Mol. Endocrinol.  |x 08888809  |w (AR-BaUEN)CENRE-6153  |t Molecular Endocrinology 
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856 4 0 |u https://doi.org/10.1210/me.16.7.1638  |y DOI 
856 4 0 |u https://hdl.handle.net/20.500.12110/paper_08888809_v16_n7_p1638_Kovalovsky  |y Handle 
856 4 0 |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08888809_v16_n7_p1638_Kovalovsky  |y Registro en la Biblioteca Digital 
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999 |c 66244