Ubiquitin Accumulation in Autophagy-Deficient Mice is Dependent on the Nrf2-Mediated Stress Response Pathway: A Potential Role for Protein Aggregation in Autophagic Substrate Selection

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Ubiquitin Accumulation in Autophagy-Deficient Mice is Dependent on the Nrf2-Mediated Stress Response Pathway: A Potential Role for Protein Aggregation in Autophagic Substrate Selection

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Title: Ubiquitin Accumulation in Autophagy-Deficient Mice is Dependent on the Nrf2-Mediated Stress Response Pathway: A Potential Role for Protein Aggregation in Autophagic Substrate Selection
Author: Riley, Brigit E.; Kaiser, Stephen E.; Shaler, Thomas A.; Hara, Taichi; Hipp, Mark S.; Lage, Kasper; Ryu, Kwon-Yul; Taguchi, Keiko; Yamamoto, Masayuki; Tanaka, Keiji; Mizushima, Noboru; Komatsu, Masaaki; Ng, Aylwin Chun-Yeen; Xavier, Ramnik; Kopito, Ron R.

Note: Order does not necessarily reflect citation order of authors.

Citation: Riley, Brigit E., Stephen E. Kaiser, Thomas A. Shaler, Aylwin C.Y. Ng, Taichi Hara, Mark S. Hipp, Kasper Lage, et al. 2010. Ubiquitin accumulation in autophagy-deficient mice is dependent on the Nrf2-mediated stress response pathway: A potential role for protein aggregation in autophagic substrate selection. Journal of Cell Biology 191(3): 537-552.
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Abstract: Genetic ablation of autophagy in mice leads to liver and brain degeneration accompanied by the appearance of ubiquitin (Ub) inclusions, which has been considered to support the hypothesis that ubiquitination serves as a cis-acting signal for selective autophagy. We show that tissue-specific disruption of the essential autophagy genes Atg5 and Atg7 leads to the accumulation of all detectable Ub–Ub topologies, arguing against the hypothesis that any particular Ub linkage serves as a specific autophagy signal. The increase in Ub conjugates in Atg7\(^{−/−}\) liver and brain is completely suppressed by simultaneous knockout of either p62 or Nrf2. We exploit a novel assay for selective autophagy in cell culture, which shows that inactivation of Atg5 leads to the selective accumulation of aggregation-prone proteins, and this does not correlate with an increase in substrate ubiquitination. We propose that protein oligomerization drives autophagic substrate selection and that the accumulation of poly-Ub chains in autophagy-deficient circumstances is an indirect consequence of activation of Nrf2-dependent stress response pathways.
Published Version: doi:10.1083/jcb.201005012
Other Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3003313/pdf/
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:8296044

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