| Tubular network formation protects mitochondria from autophagosomal degradation during nutrient starvation. | |
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MedLine Citation:
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PMID: 21646527 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Mitochondria are highly dynamic organelles that mediate essential cell functions such as apoptosis and cell-cycle control in addition to their role as efficient ATP generators. Mitochondrial morphology changes are tightly regulated, and their shape can shift between small, fragmented units and larger networks of elongated mitochondria. We demonstrate that mitochondrial elements become significantly elongated and interconnected shortly after nutrient depletion. This mitochondrial morphological shift depends on the type of starvation, with an additive effect observed when multiple nutrients are depleted simultaneously. We further show that starvation-induced mitochondrial elongation is mediated by down-regulation of dynamin-related protein 1 (Drp1) through modulation of two Drp1 phosphorylation sites, leading to unopposed mitochondrial fusion. Finally, we establish that mitochondrial tubulation upon nutrient deprivation protects mitochondria from autophagosomal degradation, which could permit mitochondria to maximize energy production and supply autophagosomal membranes during starvation. |
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Authors:
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Angelika S Rambold; Brenda Kostelecky; Natalie Elia; Jennifer Lippincott-Schwartz |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-6-6 |
Journal Detail:
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Title: Proceedings of the National Academy of Sciences of the United States of America Volume: - ISSN: 1091-6490 ISO Abbreviation: - Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-6-7 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7505876 Medline TA: Proc Natl Acad Sci U S A Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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The Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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