Cited by 319Adipokines, Inflammation, and Metabolic DiseasesAdipose Tissue and MetabolismDiabetes Treatment and Management

Glucagon-like peptide-1 inhibits adipose tissue macrophage infiltration and inflammation in an obese mouse model of diabetes

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Lee, Y.-S., Park, M.-S., Choung, J.-S., Kim, S.-S., Oh, H.-H., Choi, C.-S., Ha, S.-Y., Kang, Y. +2 more·2012·Diabetologia

Abstract

Aims/hypothesis Obesity and insulin resistance are associated with low-grade chronic inflammation. Glucagon-like peptide-1 (GLP-1) is known to reduce insulin resistance. We investigated whether GLP-1 has anti-inflammatory effects on adipose tissue, including adipocytes and adipose tissue macrophages (ATM).Methods We administered a recombinant adenovirus (rAd) producing GLP-1 (rAd-GLP-1) to an ob/ob mouse model of diabetes. We examined insulin sensitivity, body fat mass, the infiltration of ATM and metabolic profiles. We analysed the mRNA expression of inflammatory cytokines, lipogenic genes, and M1 and M2 macrophage-specific genes in adipose tissue by real-time quantitative PCR. We also examined the activation of nuclear factor κB (NF-κB), extracellular signal-regulated kinase 1/2 and Jun N-terminal kinase (JNK) in vivo and in vitro.Results Fat mass, adipocyte size and mRNA expression of lipogenic genes were significantly reduced in adipose tissue of rAd-GLP-1-treated ob/ob mice. Macrophage populations (F4/80(+) and F4/80(+)CD11b(+)CD11c(+) cells), as well as the expression and production of IL-6, TNF-α and monocyte chemoattractant protein-1, were significantly reduced in adipose tissue of rAd-GLP-1-treated ob/ob mice. Expression of M1-specific mRNAs was significantly reduced, but that of M2-specific mRNAs was unchanged in rAd-GLP-1-treated ob/ob mice. NF-κB and JNK activation was significantly reduced in adipose tissue of rAd-GLP-1-treated ob/ob mice. Lipopolysaccharide-induced inflammation was reduced by the GLP-1 receptor agonist, exendin-4, in 3T3-L1 adipocytes and ATM.Conclusions/interpretation We suggest that GLP-1 reduces macrophage infiltration and directly inhibits inflammatory pathways in adipocytes and ATM, possibly contributing to the improvement of insulin sensitivity.

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  • In adipose tissue of GLP-1-treated ob/ob mice, GLP-1RA decreases production of TNF-α, IL-6, and IL-1β.

    “In the adipose tissue of GLP-1-treated ob/ob mice expressing recombinant adenovirus, for instance, GLP-1RA has been shown to decrease the production of TNF-α, IL-6, and IL-1β, all of which are significant mediators of inflammation.”

    From Anti-inflammatory role of glucagon-like peptide 1 receptor agonists and its clinical implications (2024) · cites this paper as [38]

    The Results (Fig. 3, page unavailable) report decreased TNF-α and IL-6 protein production in adipose tissue of rAd-GLP-1-treated ob/ob mice. The measured cytokines were TNF-α, IL-6, and MCP-1; our copy does not report an IL-1β reduction. The intervention was recombinant adenovirus expressing GLP-1, rather than a separately administered GLP-1 receptor agonist. (LLM, conf=0.92)

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  • Antiinflammatory benefits of GLP-1 medicines have been observed in various preclinical models, such as obesity, atherosclerosis, steatohepatitis, and nephritis, even in the absence of direct immune cell targeting.

    “antiinflammatory benefits have been observed in various preclinical models, such as obesity, atherosclerosis, steatohepatitis, and nephritis, even in the absence of direct immune cell targeting (27–32).”

    From Antiinflammatory actions of glucagon-like peptide-1–based therapies beyond metabolic benefits (2025) · cites this paper as [27]

    The Discussion reports reduced adipose-tissue inflammation in obese mice, supporting the obesity example. It also says GLP-1 directly inhibits inflammatory signalling in adipose-tissue macrophages, so this paper does not support the qualification that the benefit occurred without direct immune-cell targeting. It does not address the other listed disease models. (LLM, conf=0.87)

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  • GLP-1 shows anti-inflammatory effects on pancreatic islets and adipose tissue, contributing to lowering glucose levels in diabetes.

    “It was reported that GLP-1 shows anti-inflammatory effects on pancreatic islets and adipose tissue, contributing to lowering glucose levels in diabetes [18–20].”

    From Anti-Inflammatory Effects of GLP-1-Based Therapies beyond Glucose Control (2016) · cites this paper as [18]

    The Discussion (page unavailable) reports that GLP-1 reduced adipose-tissue inflammation in diabetic ob/ob mice and suggests this may improve insulin sensitivity. The Introduction describes GLP-1’s glucose-lowering actions, but this paper does not establish that reduced inflammation lowers glucose, and the retrieved passages do not address anti-inflammatory effects in pancreatic islets. (LLM, conf=0.88)

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  • Administration of a recombinant adenovirus producing GLP-1 (4 × 10^9 PFU/mouse) to ob/ob mice reduced the macrophage population and production of TNF-α, MCP-1, and IL-6 in adipose tissue via inhibition of NF-κB activation and phosphorylation of ERK1/2 and JNK.

    “Administration of a recombinant adenovirus producing GLP-1 (4 × 109 PFU/mouse) to ob/ob mice reduced the macrophage population and production of TNF-α, MCP-1, and IL-6 in adipose tissue via inhibition of nuclear factor-kappa B (NF-κB) activation and phosphorylation of ERK1/2 and c-Jun N-terminal kinases [18].”

    From Anti-Inflammatory Effects of GLP-1-Based Therapies beyond Glucose Control (2016) · cites this paper as [18]

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  • GLP-1 receptor agonists may potentially reduce inflammation and oxidative stress in adipose tissue by affecting expression of cytokines, chemokines, and macrophage infiltration, with prolonged GLP-1 action potentially alleviating obesity-related adipose tissue inflammation while enhancing expression of anti-inflammatory genes.

    “GLP-1 receptor agonists may potentially reduce inflammation and oxidative stress in adipose tissue by affecting the expression of cytokines, chemokines, and macrophage infiltration, with prolonged GLP-1 action potentially alleviating obesity-related adipose tissue inflammation while enhancing the expression of anti-inflammatory genes [17,18]”

    From New Developments in Pharmacological Treatment of Obesity and Type 2 Diabetes—Beyond and within GLP-1 Receptor Agonists (2024) · cites this paper as [17]

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Authors
Lee, Y.-S., Park, M.-S., Choung, J.-S., Kim, S.-S., Oh, H.-H., Choi, C.-S., Ha, S.-Y., Kang, Y., Kim, Y., & Jun, H.-S.
Affiliations
  • Gachon University (KR)
  • Gachon University Gil Medical Center (KR)
  • Ajou University (KR)
  • Seoul National University (KR)
Corresponding author
Jun, H.-S.
Venue
Diabetologia
Published
2012-06-22
Volume
55
Issue
9
Pages
2456-2468
ISSN
  • 0012-186X (ISSN-L)
  • 1432-0428
OpenAlex
W1993624198
Cited by
319
References
47
Citations by year
2026: 31 · 2025: 34 · 2024: 35 · 2023: 29 · 2022: 25 · 2021: 24 · 2020: 17 · 2019: 26 · 2018: 17 · 2017: 15 · 2016: 17 · 2015: 17 · 2014: 18 · 2013: 12 · 2012: 2
FWCI
11.69
Type
journal article
Language
en
Open access
Locations
  • Diabetologia (publishedVersion)
  • PubMed (publishedVersion)
  • AJOU Open Repository (Ajou University) (submittedVersion)
Funders
  • National Research Foundation
  • National Research Foundation of Korea (A062260)
  • Korea Science and Engineering Foundation
Topics
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
Keywords
glucagon-like peptide-1, adipose tissue macrophages, adipose tissue inflammation, obesity, type 2 diabetes, insulin resistance, ob/ob mice, adipocyte size, lipogenic gene expression, macrophage polarization, NF-κB, JNK, exendin-4, lipopolysaccharide-induced inflammation, adipocyte inflammation, adipose tissue mass
MeSH terms
Glucagon-Like Peptide-1 Receptor, Adipose Tissue, Animals, Anti-Inflammatory Agents, Gene Expression Regulation, Inflammation, Insulin Resistance, Macrophages, Mice, Obese, Obesity, NF-kappa B, Receptors, Glucagon, Body Fat Distribution, Mice, Glucagon-Like Peptide 1, Real-Time Polymerase Chain Reaction

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