Autophagy in health and disease. 2. Regulation of lipid metabolism and storage by autophagy: Pathophysiological implications

Mark J. Czaja

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

Autophagy is a lysosomal degradative pathway critical for the removal and breakdown of cellular components such as organelles and proteins. Despite striking similarities in the regulation and function of autophagy and lipid metabolism, the two processes have only recently been shown to be interrelated. This review details new findings of critical functions for autophagy in lipid metabolism and storage. Studies in hepatocytes and liver have demonstrated that macroautophagy mediates the breakdown of lipids stored in lipid droplets and that an inhibition of autophagy leads to the development of a fatty liver. In contrast, in adipocytes the loss of macroautophagy decreases the amount of lipid stored in adipose tissue through effects on white and brown adipocyte differentiation. Other investigations have indicated that the relationship between autophagy and lipids is bidirectional, with changes in cellular lipid content altering autophagic function. These newly described links between autophagy and lipid metabolism and storage have provided new insights into the mechanisms of both processes. The findings also suggest possible new therapeutic approaches to the problems of lipid overaccumulation and impaired autophagy that occur with aging and the metabolic syndrome.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Cell Physiology
Volume298
Issue number5
DOIs
StatePublished - May 2010

Fingerprint

Autophagy
Lipid Metabolism
Health
Lipids
White Adipocytes
Brown Adipocytes
Critical Pathways
Fatty Liver
Adipocytes
Organelles
Adipose Tissue
Hepatocytes
Liver

Keywords

  • Adipocyte
  • Fatty liver disease
  • Hepatocyte
  • Macroautophagy
  • Metabolic syndrome

ASJC Scopus subject areas

  • Cell Biology
  • Physiology

Cite this

@article{bc03db71bc20408886fc4687883ca649,
title = "Autophagy in health and disease. 2. Regulation of lipid metabolism and storage by autophagy: Pathophysiological implications",
abstract = "Autophagy is a lysosomal degradative pathway critical for the removal and breakdown of cellular components such as organelles and proteins. Despite striking similarities in the regulation and function of autophagy and lipid metabolism, the two processes have only recently been shown to be interrelated. This review details new findings of critical functions for autophagy in lipid metabolism and storage. Studies in hepatocytes and liver have demonstrated that macroautophagy mediates the breakdown of lipids stored in lipid droplets and that an inhibition of autophagy leads to the development of a fatty liver. In contrast, in adipocytes the loss of macroautophagy decreases the amount of lipid stored in adipose tissue through effects on white and brown adipocyte differentiation. Other investigations have indicated that the relationship between autophagy and lipids is bidirectional, with changes in cellular lipid content altering autophagic function. These newly described links between autophagy and lipid metabolism and storage have provided new insights into the mechanisms of both processes. The findings also suggest possible new therapeutic approaches to the problems of lipid overaccumulation and impaired autophagy that occur with aging and the metabolic syndrome.",
keywords = "Adipocyte, Fatty liver disease, Hepatocyte, Macroautophagy, Metabolic syndrome",
author = "Czaja, {Mark J.}",
year = "2010",
month = "5",
doi = "10.1152/ajpcell.00527.2009",
language = "English (US)",
volume = "298",
journal = "American Journal of Physiology - Renal Fluid and Electrolyte Physiology",
issn = "1931-857X",
publisher = "American Physiological Society",
number = "5",

}

TY - JOUR

T1 - Autophagy in health and disease. 2. Regulation of lipid metabolism and storage by autophagy

T2 - Pathophysiological implications

AU - Czaja, Mark J.

PY - 2010/5

Y1 - 2010/5

N2 - Autophagy is a lysosomal degradative pathway critical for the removal and breakdown of cellular components such as organelles and proteins. Despite striking similarities in the regulation and function of autophagy and lipid metabolism, the two processes have only recently been shown to be interrelated. This review details new findings of critical functions for autophagy in lipid metabolism and storage. Studies in hepatocytes and liver have demonstrated that macroautophagy mediates the breakdown of lipids stored in lipid droplets and that an inhibition of autophagy leads to the development of a fatty liver. In contrast, in adipocytes the loss of macroautophagy decreases the amount of lipid stored in adipose tissue through effects on white and brown adipocyte differentiation. Other investigations have indicated that the relationship between autophagy and lipids is bidirectional, with changes in cellular lipid content altering autophagic function. These newly described links between autophagy and lipid metabolism and storage have provided new insights into the mechanisms of both processes. The findings also suggest possible new therapeutic approaches to the problems of lipid overaccumulation and impaired autophagy that occur with aging and the metabolic syndrome.

AB - Autophagy is a lysosomal degradative pathway critical for the removal and breakdown of cellular components such as organelles and proteins. Despite striking similarities in the regulation and function of autophagy and lipid metabolism, the two processes have only recently been shown to be interrelated. This review details new findings of critical functions for autophagy in lipid metabolism and storage. Studies in hepatocytes and liver have demonstrated that macroautophagy mediates the breakdown of lipids stored in lipid droplets and that an inhibition of autophagy leads to the development of a fatty liver. In contrast, in adipocytes the loss of macroautophagy decreases the amount of lipid stored in adipose tissue through effects on white and brown adipocyte differentiation. Other investigations have indicated that the relationship between autophagy and lipids is bidirectional, with changes in cellular lipid content altering autophagic function. These newly described links between autophagy and lipid metabolism and storage have provided new insights into the mechanisms of both processes. The findings also suggest possible new therapeutic approaches to the problems of lipid overaccumulation and impaired autophagy that occur with aging and the metabolic syndrome.

KW - Adipocyte

KW - Fatty liver disease

KW - Hepatocyte

KW - Macroautophagy

KW - Metabolic syndrome

UR - http://www.scopus.com/inward/record.url?scp=77951464621&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77951464621&partnerID=8YFLogxK

U2 - 10.1152/ajpcell.00527.2009

DO - 10.1152/ajpcell.00527.2009

M3 - Article

C2 - 20089934

AN - SCOPUS:77951464621

VL - 298

JO - American Journal of Physiology - Renal Fluid and Electrolyte Physiology

JF - American Journal of Physiology - Renal Fluid and Electrolyte Physiology

SN - 1931-857X

IS - 5

ER -