Cited by 15Adipose Tissue and MetabolismAdipokines, Inflammation, and Metabolic DiseasesLipid metabolism and biosynthesis

Deficiency in interleukin-18 promotes differentiation of brown adipose tissue resulting in fat accumulation despite dyslipidemia

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Yamanishi, Kyosuke, Maeda, Seishi, Kuwahara-Otani, Sachi, Hashimoto, Takuya, Ikubo, Kaoru, Mukai, Keiichiro, Nakasho, Keiji, Gamachi, Naomi +7 more·2018·Journal of Translational Medicine

Abstract

The cytokine, interleukin-18 (IL-18), was originally identified as an interferon-γ-inducing proinflammatory factor; however, there is increasing evidence suggesting that it has non-immunological effects on physiological functions. We have previously investigated the potential pathophysiological relationship between IL-18 and dyslipidemia, non-alcoholic fatty liver disease and non-alcoholic steatohepatitis, which were mediated by lipid energy imbalance. Therefore, herein we focused on brown adipocytes (BAs) and brown adipose tissue (BAT) related to energy consumption as non-shivering thermogenesis. Il18 −/− male mice were generated on the C57Bl/6 background, and littermate C57Bl/6 Il18 +/+ male mice were used as controls. To reveal the direct effect of IL-18, primary cell cultures derived from both mice were established. Moreover, for molecular analysis, microarray, quantitative reverse transcription PCR and western blotting were performed using 6 and 12 weeks old mice. To evaluate the short- and long-term effects of IL-18 on BAT, recombinant IL-18 was administered for 2 and 12 weeks, respectively. Compared with Il18 +/+ mice, BAT of Il18 −/− mice showed earlier differentiation and lipid accumulation. To examine the direct effect of IL-18 on BAT, BA cell cultures were established. Myogenic factor 5 -expressing adipose precursor cells were extracted from Il18 +/+ and Il18 −/− mice. PR domain containing 16 (PRDM16), a differentiation inducer, was strongly expressed in Il18 −/− BAs, and uncoupling protein 1, a thermogenic and differentiation marker, was upregulated, resulting in the promotion of BA differentiation. Moreover, PRDM16-dependent and independent molecules related to BAT function, such as fibroblast growth factor 21, were activated. These findings were confirmed by comparing Il18 +/+ and Il18 −/− mice at 6 and 12 weeks of age. Additional analyses of the molecular mechanisms influencing the ‘Quantity of adipocytes’ identified three associated genes, apolipoprotein C3 ( Apoc3 ), insulin-induced gene 1 ( Insig1 ) and vitamin D (1,25-dihydroxyvitamin D3) receptor ( Vdr ). Intravenous administration of IL-18 not only significantly improved the expression of some of these genes, but it also significantly decreased the adipocytes’ size. This study demonstrated the critical function of IL-18 in differentiation and lipid metabolism in BAs. Furthermore, IL-18 may contribute to novel treatments by improving the energy imbalance.

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Authors
Yamanishi, K., Maeda, S., Kuwahara-Otani, S., Hashimoto, T., Ikubo, K., Mukai, K., Nakasho, K., Gamachi, N., El-Darawish, Y., Li, W., Okuzaki, D., Watanabe, Y., Yamanishi, H., Okamura, H., & Matsunaga, H.
Affiliations
  • Hyogo Medical University (JP)
  • Research Institute for Microbial Diseases, The University of Osaka (JP)
Corresponding author
Matsunaga, Hisato
Venue
Journal of Translational Medicine
Published
2018-11-19
Volume
16
Issue
1
Pages
314-314
ISSN
1479-5876 (ISSN-L)
OpenAlex
W2901070596
Cited by
15
References
56
Citations by year
2026: 1 · 2025: 1 · 2024: 3 · 2023: 1 · 2022: 4 · 2021: 3 · 2019: 2
FWCI
0.86
Type
journal article
Language
en
Open access
Locations
  • Journal of Translational Medicine (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
Keywords
IL-18, brown adipose tissue, brown adipocyte differentiation, dyslipidemia, non-shivering thermogenesis, PRDM16, UCP1, FGF21, apolipoprotein C-III, INSIG1, vitamin D receptor, adipogenesis, lipid accumulation, energy metabolism
MeSH terms
Animals, Adipose Tissue, Brown, Cell Differentiation, Fatty Liver, Male, Mice, Inbred C57BL, Recombinant Proteins, Stem Cells, Interleukin-18, Thermogenesis, Adiposity, Adipogenesis, Dyslipidemias, Lipid Metabolism

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