Bilirubin reduces visceral obesity and insulin resistance by suppression of inflammatory cytokines


Autoři: Ryoko Takei aff001;  Tomoaki Inoue aff001;  Noriyuki Sonoda aff001;  Motoyuki Kohjima aff001;  Misato Okamoto aff001;  Ryuichi Sakamoto aff001;  Toyoshi Inoguchi aff002;  Yoshihiro Ogawa aff001
Působiště autorů: Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan aff001;  Fukuoka City Health Promotion Support Center, Fukuoka, Japan aff002;  Department of Molecular and Cellular Metabolism, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan aff003
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0223302

Souhrn

Objective

Although previous studies have reported a negative relationship between serum bilirubin concentration and the development of diabetes mellitus (DM), the relationship between bilirubin and insulin resistance has not been thoroughly assessed. This study was designed to determine the relationships between bilirubin, body fat distribution, and adipose tissue inflammation in patients with type 2 DM and the effect of bilirubin in an obese animal model.

Method

Body fat distribution was measured using an abdominal dual bioelectrical impedance analyzer in patients with type 2 DM. We also measured glycemic control, lipid profile, serum bilirubin concentration and other clinical characteristics, and determined their relationships with body fat distribution. In the animal study, biliverdin (20 mg/kg daily) was orally administered to high-fat diet (HFD)-induced obese (DIO) mice for 2 weeks, after which intraperitoneal insulin tolerance testing was performed. Then, adipocyte area, adipocytokine expression, and macrophage polarization were evaluated in epididymal adipose tissues.

Results

In the clinical study, univariate analysis showed that a lower bilirubin concentration was significantly correlated with higher body mass index, waist circumference, triglyceride, uric acid, creatinine, visceral fat area and lower HDL-C. In multivariate analyses, bilirubin concentration significantly correlated with diastolic blood pressure, creatinine, and visceral fat area. However, there was no association between bilirubin concentration and subcutaneous fat area. In the animal study, DIO mice treated with biliverdin had smaller adipocytes than untreated DIO mice and biliverdin improved HFD-induced insulin resistance. Biliverdin treatment reversed the higher gene expression of Cd11c, encoding an M1 macrophage marker, and Tnfa, encoding the proinflammatory cytokine tumor necrosis factor-α, in the adipose tissues of DIO mice. These data suggest biliverdin administration alleviates insulin resistance by ameliorating inflammation and the dysregulation of adipocytokine expression in adipose tissues of DIO mice.

Conclusions

Bilirubin may protect against insulin resistance by ameliorating visceral obesity and adipose tissue inflammation.

Klíčová slova:

Adipose tissue – Diabetes mellitus – Fats – Inflammation – Insulin resistance – Obesity – Bilirubin – Adipocytes


Zdroje

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Článek vyšel v časopise

PLOS One


2019 Číslo 10

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