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Van Woerkom A, Harney DJ, Nagarajan SR, Hakeem-Sanni MF, Lin J, Hooke M, Pilpitel T, Cooney GJ, Larance M, Saunders DN, Brandon AE, Hoy AJ. Hepatic lipid droplet-associated proteome changes distinguish dietary-induced fatty liver from glucose tolerance in male mice. Am J Physiol Endocrinol Metab 2024. [PMID: 38656127 DOI: 10.1152/ajpendo.00013.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 04/15/2024] [Indexed: 04/26/2024]
Abstract
Fatty liver is characterized by the expansion of lipid droplets (LDs) and is associated with the development of many metabolic diseases. We assessed the morphology of hepatic LDs and performed quantitative proteomics in lean, glucose-tolerant mice compared to high-fat diet (HFD) fed mice that displayed hepatic steatosis and glucose intolerance as well as high-starch diet (HStD) fed mice who exhibited similar levels of hepatic steatosis but remained glucose tolerant. Both HFD and HStD-fed mice had more and larger LDs than Chow-fed animals. We observed striking differences in liver LD proteomes of HFD and HStD-fed mice compared to Chow-fed mice, with fewer differences between HFD and HStD. Taking advantage of our diet strategy, we identified a fatty liver LD proteome consisting of proteins common in HFD- and HStD-fed mice, as well as a proteome associated with glucose tolerance that included proteins shared in Chow and HStD but not HFD-fed mice. Notably, glucose intolerance was associated with changes in the ratio of adipose triglyceride lipase to perilipin 5 in the LD proteome, suggesting dysregulation of neutral lipid homeostasis in glucose-intolerant fatty liver. We conclude that our novel dietary approach uncouples ectopic lipid burden from insulin resistance-associated changes in the hepatic lipid droplet proteome.
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Affiliation(s)
- Andries Van Woerkom
- School of Medical Sciences, University of Sydney, Sydney, New South Wales, Australia
| | - Dylan J Harney
- School of Life and Environmental Sciences, University of Sydney, Sydney, New South Wales, Australia
| | - Shilpa R Nagarajan
- School of Medical Sciences, University of Sydney, Sydney, New South Wales, Australia
| | - Mariam F Hakeem-Sanni
- School of Medical Sciences, University of Sydney, Sydney, New South Wales, Australia
| | - Jinfeng Lin
- School of Medical Sciences, University of Sydney, Sydney, New South Wales, Australia
| | - Matthew Hooke
- School of Medical Sciences, University of Sydney, Sydney, New South Wales, Australia
| | - Tamara Pilpitel
- School of Life and Environmental Sciences, University of Sydney, Sydney, New South Wales, Australia
| | - Gregory J Cooney
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Mark Larance
- School of Medical Sciences, University of Sydney, Sydney, New South Wales, Australia
| | - Darren N Saunders
- School of Medical Sciences, University of Sydney, Sydney, New South Wales, Australia
| | - Amanda E Brandon
- Sydney Medical School, Charles Perking Centre D17, Univerity of Sydney, Sydney, New South Wales, Australia
| | - Andrew J Hoy
- School of Medical Sciences, University of Sydney, Sydney, New South Wales, Australia
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