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Lipid raft modulation inhibits NSCLC cell migration through delocalization of the focal adhesion complex.
Jeon, Jeong Hee; Kim, Se Kyu; Kim, Hyung Jung; Chang, Joon; Ahn, Chul Min; Chang, Yoon Soo.
Afiliación
  • Jeon JH; Brain Korea 21 Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Republic of Korea.
Lung Cancer ; 69(2): 165-71, 2010 Aug.
Article en En | MEDLINE | ID: mdl-19945766
Lipid raft, a specialized membrane structure enriched with cholesterol and glycosphingolipid, contains molecules that convey environmental stimuli to the intracellular systems. Authors investigated the effects of raft cholesterol depletion on non-small cell lung cancer (NSCLC) cell migration. Incubation of NSCLC cells in media containing lovastatin resulted in inhibition of cell migration by 63.1-83.3%, whereas raft cholesterol depletion with successive treatment using methyl-beta cyclodextrin (MbetaCD) followed by lovastatin further suppressed their migration by 35.0-57.8%. Raft cholesterol depletion partially inhibited EGF-induced phosphorylation of EGFR and FAK, however, no change was observed in other molecules comprising focal adhesion complex. It resulted in disappearance of filopodia, inhibition of EGF-induced pY397 FAK aggregation, and its destabilization. Cholesterol depletion inhibited phosphorylation of Src on Y416 in the detergent-insoluble fraction followed by decreased localization of total and pY397 FAK in the detergent-insoluble fraction. Minimal changes in these molecules were observed in the detergent-soluble fraction and interactions between FAK and other molecules of the focal adhesion complex were not influenced. Immunocytochemical analysis confirmed translocation of Src from the raft into cytoplasm and disappearance of EGF-induced membrane ruffling by raft cholesterol depletion. In cholesterol-depleted cells, EGF-induced phosphorylation of Src, Akt, and p44/42 in the detergent-insoluble fraction were inhibited whereas phosphorylation of GSK-3beta was unaffected. We conclude that raft cholesterol depletion inhibited NSCLC migration through inhibition of phosphorylation of raft associated Src and dislocation of molecules comprising focal adhesion complexes from raft rather than by inhibiting their recruitment to Src and interaction.
Asunto(s)

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Colesterol / Carcinoma de Pulmón de Células no Pequeñas / Microdominios de Membrana / Quinasa 1 de Adhesión Focal / Receptores ErbB Límite: Humans Idioma: En Revista: Lung Cancer Asunto de la revista: NEOPLASIAS Año: 2010 Tipo del documento: Article Pais de publicación: Irlanda

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Colesterol / Carcinoma de Pulmón de Células no Pequeñas / Microdominios de Membrana / Quinasa 1 de Adhesión Focal / Receptores ErbB Límite: Humans Idioma: En Revista: Lung Cancer Asunto de la revista: NEOPLASIAS Año: 2010 Tipo del documento: Article Pais de publicación: Irlanda