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Cited by 196

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Inhibitory effect of dietary lipids on chaperone-mediated autophagy

Rodriguez-Navarro, Jose Antonio, Kaushik, Susmita, Koga, Hiroshi, Dall'Armi, Claudia, Shui, Guanghou, Wenk, Markus R., Di Paolo, Gilbert, Cuervo, Ana Maria·2012·Proceedings of the National Academy of Sciences
DOI 10.1073/pnas.1113036109
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Abstract

Cytosolic proteins can be selectively delivered to lysosomes for degradation through a type of autophagy known as chaperone-mediated autophagy (CMA). CMA contributes to intracellular quality control and to the cellular response to stress. Compromised CMA has been described in aging and in different age-related disorders. CMA substrates cross the lysosomal membrane through a translocation complex; consequently, changes in the properties of the lysosomal membrane should have a marked impact on CMA activity. In this work, we have analyzed the impact that dietary intake of lipids has on CMA activity. We have found that chronic exposure to a high-fat diet or acute exposure to a cholesterol-enriched diet both have an inhibitory effect on CMA. Lysosomes from livers of lipid-challenged mice had a marked decrease in the levels of the CMA receptor, the lysosome-associated membrane protein type 2A, because of loss of its stability at the lysosomal membrane. This accelerated degradation of lysosome-associated membrane protein type 2A, also described as the mechanism that determines the decline in CMA activity with age, results from its increased mobilization to specific lipid regions at the lysosomal membrane. Comparative lipidomic analyses revealed qualitative and quantitative changes in the lipid composition of the lysosomal membrane of the lipid-challenged animals that resemble those observed with age. Our findings identify a previously unknown negative impact of high dietary lipid intake on CMA and underscore the importance of diet composition on CMA malfunction in aging.

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Metadata

Authors
Rodriguez-Navarro, J. A., Kaushik, S., Koga, H., Dall'Armi, C., Shui, G., Wenk, M. R., Di Paolo, G., & Cuervo, A. M.
Affiliations
  • Department of Developmental and Molecular Biology, Institute for Aging Studies, Marion Bessin Liver Research Center, Albert Einstein College of Medicine, Bronx, NY 10461;
  • Department of Pathology and Cell Biology, Taub Institute for Research on Alzheimer's Disease and the Aging Brain, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY 10032; and
  • Department of Biochemistry, National University of Singapore, Singapore 117597
Venue
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences
Published
2012-02-13
Volume
109
Issue
12
ISSN
  • 0027-8424
  • 1091-6490
DOI
10.1073/pnas.1113036109
Cited by
196
References
10
Language
en

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CoChat. (2026). Citation check: Inhibitory effect of dietary lipids on chaperone-mediated autophagy. https://app.cochat.ai/papers/10.1073/pnas.1113036109
The paper
Rodriguez-Navarro, J. A., Kaushik, S., Koga, H., Dall'Armi, C., Shui, G., Wenk, M. R., Di Paolo, G., & Cuervo, A. M. (2012). Inhibitory effect of dietary lipids on chaperone-mediated autophagy. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1113036109

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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