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Rab5 Mediates Caspase-8–promoted Cell Motility and Metastasis

Caspase-8 is a key apical sensory protein that governs cell responses to environmental cues, alternatively promoting apoptosis, proliferation, and cell migration. The proteins responsible for integration of these pathways, however, have remained elusive. Here, we reveal that Rab5 regulates caspase-8...

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Autores principales: Torres, Vicente A., Mielgo, Ainhoa, Barbero, Simone, Hsiao, Ruth, Wilkins, John A., Stupack, Dwayne G.
Formato: Texto
Lenguaje:English
Publicado: The American Society for Cell Biology 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2808229/
https://www.ncbi.nlm.nih.gov/pubmed/19923319
http://dx.doi.org/10.1091/mbc.E09-09-0769
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author Torres, Vicente A.
Mielgo, Ainhoa
Barbero, Simone
Hsiao, Ruth
Wilkins, John A.
Stupack, Dwayne G.
author_facet Torres, Vicente A.
Mielgo, Ainhoa
Barbero, Simone
Hsiao, Ruth
Wilkins, John A.
Stupack, Dwayne G.
author_sort Torres, Vicente A.
collection PubMed
description Caspase-8 is a key apical sensory protein that governs cell responses to environmental cues, alternatively promoting apoptosis, proliferation, and cell migration. The proteins responsible for integration of these pathways, however, have remained elusive. Here, we reveal that Rab5 regulates caspase-8–dependent signaling from integrins. Integrin ligation leads to Rab5 activation, association with integrins, and activation of Rac, in a caspase-8–dependent manner. Rab5 activation promotes colocalization and coprecipitation of integrins with caspase-8, concomitant with Rab5 recruitment to integrin-rich regions such as focal adhesions and membrane ruffles. Moreover, caspase-8 expression promotes Rab5-mediated internalization and the recycling of β1 integrins, increasing cell migration independently of caspase catalytic activity. Conversely, Rab5 knockdown prevented caspase-8–mediated integrin signaling for Rac activation, cell migration, and apoptotic signaling, respectively. Similarly, Rab5 was critical for caspase-8–driven cell migration in vivo, because knockdown of Rab5 compromised the ability of caspase-8 to promote metastasis under nonapoptotic conditions. These studies identify Rab5 as a key integrator of caspase-8–mediated signal transduction downstream of integrins, regulating cell survival and migration in vivo and in vitro.
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spelling pubmed-28082292010-03-30 Rab5 Mediates Caspase-8–promoted Cell Motility and Metastasis Torres, Vicente A. Mielgo, Ainhoa Barbero, Simone Hsiao, Ruth Wilkins, John A. Stupack, Dwayne G. Mol Biol Cell Articles Caspase-8 is a key apical sensory protein that governs cell responses to environmental cues, alternatively promoting apoptosis, proliferation, and cell migration. The proteins responsible for integration of these pathways, however, have remained elusive. Here, we reveal that Rab5 regulates caspase-8–dependent signaling from integrins. Integrin ligation leads to Rab5 activation, association with integrins, and activation of Rac, in a caspase-8–dependent manner. Rab5 activation promotes colocalization and coprecipitation of integrins with caspase-8, concomitant with Rab5 recruitment to integrin-rich regions such as focal adhesions and membrane ruffles. Moreover, caspase-8 expression promotes Rab5-mediated internalization and the recycling of β1 integrins, increasing cell migration independently of caspase catalytic activity. Conversely, Rab5 knockdown prevented caspase-8–mediated integrin signaling for Rac activation, cell migration, and apoptotic signaling, respectively. Similarly, Rab5 was critical for caspase-8–driven cell migration in vivo, because knockdown of Rab5 compromised the ability of caspase-8 to promote metastasis under nonapoptotic conditions. These studies identify Rab5 as a key integrator of caspase-8–mediated signal transduction downstream of integrins, regulating cell survival and migration in vivo and in vitro. The American Society for Cell Biology 2010-01-15 /pmc/articles/PMC2808229/ /pubmed/19923319 http://dx.doi.org/10.1091/mbc.E09-09-0769 Text en © 2010 by The American Society for Cell Biology
spellingShingle Articles
Torres, Vicente A.
Mielgo, Ainhoa
Barbero, Simone
Hsiao, Ruth
Wilkins, John A.
Stupack, Dwayne G.
Rab5 Mediates Caspase-8–promoted Cell Motility and Metastasis
title Rab5 Mediates Caspase-8–promoted Cell Motility and Metastasis
title_full Rab5 Mediates Caspase-8–promoted Cell Motility and Metastasis
title_fullStr Rab5 Mediates Caspase-8–promoted Cell Motility and Metastasis
title_full_unstemmed Rab5 Mediates Caspase-8–promoted Cell Motility and Metastasis
title_short Rab5 Mediates Caspase-8–promoted Cell Motility and Metastasis
title_sort rab5 mediates caspase-8–promoted cell motility and metastasis
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2808229/
https://www.ncbi.nlm.nih.gov/pubmed/19923319
http://dx.doi.org/10.1091/mbc.E09-09-0769
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