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Hepatology
Article
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Hepatology
Article . 2015 . Peer-reviewed
License: Wiley TDM
Data sources: Crossref
Hepatology
Article . 2015
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The small GTPase Rab7 as a central regulator of hepatocellular lipophagy

Authors: Barbara, Schroeder; Ryan J, Schulze; Shaun G, Weller; Arthur C, Sletten; Carol A, Casey; Mark A, McNiven;

The small GTPase Rab7 as a central regulator of hepatocellular lipophagy

Abstract

Autophagy is a central mechanism by which hepatocytes catabolize lipid droplets (LDs). Currently, the regulatory mechanisms that control this important process are poorly defined. The small guanosine triphosphatase (GTPase) Rab7 has been implicated in the late endocytic pathway and is known to associate with LDs, although its role in LD breakdown has not been tested. In this study, we demonstrate that Rab7 is indispensable for LD breakdown (“lipophagy”) in hepatocytes subjected to nutrient deprivation. Importantly, Rab7 is dramatically activated in cells placed under nutrient stress; this activation is required for the trafficking of both multivesicular bodies and lysosomes to the LD surface during lipophagy, resulting in the formation of a lipophagic “synapse.” Depletion of Rab7 leads to gross morphological changes of multivesicular bodies, lysosomes, and autophagosomes, consequently leading to attenuation of hepatocellular lipophagy. Conclusion: These findings provide additional support for the role of autophagy in hepatocellular LD catabolism while implicating the small GTPase Rab7 as a key regulatory component of this essential process. (Hepatology 2015;61:1896–1907)

Related Organizations
Keywords

rab GTP-Binding Proteins, Cell Line, Tumor, Lipolysis, Autophagy, Hepatocytes, Multivesicular Bodies, Humans, rab7 GTP-Binding Proteins, Lipid Droplets, Lysosomes, Adaptor Proteins, Signal Transducing

  • BIP!
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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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    influence
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
281
Top 1%
Top 10%
Top 1%
bronze