Cited by 260Adipokines, Inflammation, and Metabolic DiseasesLipid metabolism and biosynthesisAdipose Tissue and Metabolism

What is lipotoxicity?

Engin, Ayse Basak·2017·Advances in experimental medicine and biology

Abstract

Enlarged fat cells in obese adipose tissue diminish capacity to store fat and are resistant to the anti-lipolytic effect of insulin. Insulin resistance (IR)-associated S-nitrosylation of insulin-signaling proteins increases in obesity. In accordance with the inhibition of insulin-mediated anti-lipolytic action, plasma free fatty acid (FFA) levels increase. Additionally, endoplasmic reticulum stress stimuli induce lipolysis by activating cyclic adenosine monophosphate/Protein kinase A (cAMP/PKA) and extracellular signal-regulated kinase ½ (ERK1/2) signaling in adipocytes. Failure of packaging of excess lipid into lipid droplets causes chronic elevation of circulating fatty acids, which can reach to toxic levels within non-adipose tissues. Deleterious effects of lipid accumulation in non-adipose tissues are known as lipotoxicity. In fact, triglycerides may also serve a storage function for long-chain non-esterified fatty acids and their products such as ceramides and diacylglycerols (DAGs). Thus, excess DAG, ceramide and saturated fatty acids in obesity can induce chronic inflammation and have harmful effect on multiple organs and systems. In this context, chronic adipose tissue inflammation, mitochondrial dysfunction and IR have been discussed within the scope of lipotoxicity.

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Crossref · 10.1007/978-3-319-48382-5_8

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184 of 184 references verified0 citation errors · 0 not checkable

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  • During obesity, excessive accumulation of triglycerides in adipocytes leads to cellular and organelle dysfunction.

    “Indeed, during obesity, excessive accumulation of triglycerides in adipocytes leads to cellular and organelle dysfunction [230,231].”
  • Oxidative stress is usually observed in adipocytes during obesity.

    “Oxidative stress is usually observed in adipocytes during obesity.”
  • Ectopic deposition of lipids in muscle is associated with inflammation, oxidative injury, insulin resistance and disruption of several cell functions, a condition referred to as lipotoxicity.

    “This ectopic deposition of lipids in muscle is a hallmark of pathology in several conditions and is associated with inflammation, oxidative injury, insulin resistance and disruption of several cell functions, a condition referred to as lipotoxicity [55–57].”
  • Excess ectopic lipids are believed to induce lipotoxicity that can impair neuromuscular function.

    “These excess ectopic lipids are believed to induce lipotoxicity, where dysfunctional lipid metabolism promotes inflammation, oxidative injury and disruption of several cell functions, including maintenance of the neuromuscular junction (NMJ) [55–57, 64], all of which could impair neuromuscular function.”
  • Obesity may induce brain insulin resistance through mechanisms including adipose tissue inability to store fatty acids leading to their accumulation in brain, pro-inflammatory macrophages producing cytokines that cross the blood-brain barrier and induce central inflammation, and nutrient overload causing mitochondrial dysfunction and oxidative stress.

    “Obesity may induce brain insulin resistance through several mechanisms: 1) in obesity conditions the adipose tissue loses its ability to store fatty acids, thereby inducing their accumulation in other tissues including the brain, which consequently develop insulin resistance (Engin, 2017); 2) in the adipose tissue of obese people, macrophages become pro-inflammatory and produce inflammatory”

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Authors
Engin, A. B.
Venue
Advances in experimental medicine and biology
Published
2017
Volume
960
Pages
197-220
ISSN
  • 0065-2598 (ISSN-L)
  • 2214-8019
OpenAlex
W2623539005
Cited by
260
References
184
Citations by year
2026: 9 · 2025: 32 · 2024: 35 · 2023: 38 · 2022: 44 · 2021: 40 · 2020: 24 · 2019: 24 · 2018: 12 · 2017: 2
FWCI
74.41
Type
book chapter
Language
en
Open access
closed
Locations
  • Advances in experimental medicine and biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
lipotoxicity, obesity, insulin resistance, adipocytes, lipolysis, S-nitrosylation, free fatty acids, endoplasmic reticulum stress, cAMP/PKA signaling, ERK signaling, lipid droplets, diacylglycerol, ceramide, chronic inflammation, mitochondrial dysfunction
MeSH terms
Adipose Tissue, Animals, Humans, Inflammation, Insulin Resistance, Lipids, Mitochondria, Obesity, Adipocytes

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