Asbestos causes stimulation of the extracellular signal-regulated kinase 1 mitogen-activated protein kinase cascade after phosphorylation of the epidermal growth factor receptor.
Cancer Res
; 56(23): 5334-8, 1996 Dec 01.
Article
em En
| MEDLINE
| ID: mdl-8968079
ABSTRACT
Asbestos fibers are human carcinogens with undefined mechanisms of action. In studies here, we examined signal transduction events induced by asbestos in target cells of mesothelioma and potential cell surface origins for these cascades. Asbestos fibers, but not their nonfibrous analogues, induced protracted phosphorylation of the mitogen-activated protein (MAP) kinases and extracellular signal-regulated kinases (ERK) 1 and 2, and increased kinase activity of ERK2. ERK1 and ERK2 phosphorylation and activity were initiated by addition of exogenous epidermal growth factor (EGF) and transforming growth factor-alpha, but not by isoforms of platelet-derived growth factor or insulin-like growth factor-1 in mesothelial cells. MAP kinase activation by asbestos was attenuated by suramin, which inhibits growth factor receptor interactions, or tyrphostin AG 1478, a specific inhibitor of EGF receptor tyrosine kinase activity (IC50 = 3 nM). Moreover, asbestos caused autophosphorylation of the EGF receptor, an event triggering the ERK cascade. These studies are the first to establish that a MAP kinase signal transduction pathway is initiated after phosphorylation of a peptide growth factor receptor following exposure to asbestos fibers.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Pleura
/
Amianto
/
Transdução de Sinais
/
Proteínas Quinases Dependentes de Cálcio-Calmodulina
/
Asbesto Crocidolita
/
Proteínas Quinases Ativadas por Mitógeno
/
Receptores ErbB
Tipo de estudo:
Etiology_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Cancer Res
Ano de publicação:
1996
Tipo de documento:
Article
País de afiliação:
Estados Unidos