Autor(es)

Garavello, Nicole Milare ^[1] ; Pena, Darlene Aparecida ^[1] ; Camargo Bonatto, Jose Matheus ^[1] ; Duarte, Mariana Lemos ^[1] ; Costa-Junior, Helio Miranda ^[2] ; Schumacher, Robert Ivan ^[1] ; Forti, Fabio Luis ^[1] ; Schechtman, Deborah ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, Dept Bioquim, BR-05508 Sao Paulo - Brazil

^[2] HCFMUSP, Fac Med, Inst Coracao, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PROTEOMICS; v. 94, p. 497-512, DEC 6 2013.
• Citações Web of Science: 5

Resumo

The protein kinase C (PKC) family of serine/threonine kinases participate in embryonic stem cell (ESC) proliferation/self-renewal. A few stimuli that induce ESC proliferation activate several PKC isoenzymes including delta PKC, however, the role of this isoenzyme under basal conditions that maintain undifferentiated ESCs remains to be determined. Herewith, we aimed to characterize signaling events that occur in undifferentiated ESCs upon delta PKC activation. Using phosphoproteomics and a delta PKC specific activator peptide, psi delta RACK, it was seen that the majority of proteins whose phosphorylation increased upon delta PKC activation participate in cell proliferation. Network analysis of these proteins directly connected delta PKC to Raf1 and 14-3-3. Experimental validation studies showed that activation of delta PKC increased its binding to 14-3-3, transiently activated ERK1/2 and increased ESC proliferation. Independently inhibiting MEK or PI3 kinase both led to a decrease in proliferation of approximately 50%, but delta PKC activation only recovered the effect of PI3 kinase inhibition suggesting that ERK1/2 activation via delta PKC is probably a parallel pathway to PI3 kinase and that both pathways are necessary for undifferentiated ESC proliferation. Biological significance The use of embryonic stem cells and induced pluripotent stem cells for regenerative therapies is still a challenge. Understanding the underlying mechanisms that keep these cells proliferating with the ability to differentiate in more than 200 cell types (self-renewal) will aid in the future use of these cells therapeutically. Using a targeted phosphoproteomics study, insights into signaling pathways involved in ESC proliferation can be obtained. Modulating these pathways will aid the obtention of a larger number of self-renewing stem cells and induced pluripotent stem cells that can be used therapeutically. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 10/08798-3 - Caracterização da proteína cinase C beta I nuclear das células tronco embrionárias murinas
• Beneficiário: José Matheus Camargo Bonatto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 06/52062-6 - Caracterização das diferentes isoenzimas das proteínas cinases C e seus substratos em células tronco embrionárias murinas não diferenciadas
• Beneficiário: Helio Miranda Costa Junior
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 08/58264-5 - Papel de GTPases da família Rho e de tirosina fosfatases duais no reparo de danos no DNA
• Beneficiário: Fábio Luis Forti
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 09/51337-0 - IDENTIFICACAO E VALIDACAO FUNCIONAL DE NOVOS ALVOS DAS PKCs EM CELULA TRONCO EMBRIONARIA.
• Beneficiário: Mariana Lemos Duarte
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/10321-3 - Caracterização funcional da proteína cinase c beta 1 na auto-renovação
• Beneficiário: Darlene Aparecida Pena
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/18640-8 - PKC e vias de sinalização da auto-renovação e diferenciação de células tronco embrionárias murinas
• Beneficiário: Deborah Schechtman
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/04067-7 - Caracterização do papel das pkcs na proliferação e auto-renovação das células tronco embrionárias murinas
• Beneficiário: Nicole Milaré Garavello
• Modalidade de apoio: Bolsas no Brasil - Mestrado