Green light exposure aggravates high-fat diet feeding-induced hepatic steatosis and pancreatic dysfunction in male mice

• Published in: Ecotoxicology and environmental safety Vol. 225; p. 112802
• Main Authors: Zhang, Shiyao, Xu, Mengyi, Shen, Ziyue, Shang, Changrui, Zhang, Wenxiang, Chen, Siyu, Liu, Chang
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.12.2021; Elsevier
• Subjects: Fatty liver; Green light; Hypoinsulinism; Metabolic syndrome; Metabolite; FFA; IHC; Metabolite; GTT; HFD; ITT; ALT; AUC; HDL-C; TXB2; NEFA; FBS; Hypoinsulinism; KEGG; GAD-Ab; AD; H&E; ROC; DAPI; CVD; MetS; TCA; ND; CRE; GSIS; ROS; FC; Green light; ELISA; MNC; LDL-C; CK-MB; PPI; BL; Metabolic syndrome; ORO; KRBH; DMEM; SD; NT-proBNP; Fatty liver; WL; MR-proANP; BUN; ipRGC; HbA1c; AST; GL; CK; GO; HMG-CoA; LED; eWAT; TC; TG; HOMA; VIP; RPMI
• ISSN: 0147-6513; 1090-2414
• DOI: 10.1016/j.ecoenv.2021.112802

The increased incidence of metabolic syndrome (MetS) has been demonstrated to be closely associated with external environments, such as unhealthy ambient light exposure. Of note, spectral distribution of the light functions as a critical determinant of light’s pathophysiological effects. However, the effects of the lighting spectrum on metabolic homeostasis and the specific target organs remain elusive. To address this concern, we in this study high-fat diet (HFD)-fed obese mice with different spectra of the light, and divided them into white light (WL)-treated group, green light (GL)-treated group and blue light (BL)-treated group. We found that compared with BL- or WL-treated obese mice, animals exposed to GL showed worsened metabolic status, including increased body weight gain, impaired glucose tolerance/insulin sensitivity, increased levels of serum lipids, and decreased levels of serum insulin. At the organ level, GL exposure particularly exacerbated hepatic lipid accumulation and enlarged the islet volume. Taking advantages of metabolomics and transcriptomics analyses, we screened out taurocholic acid (TCA) and adenosine (AD) as two promising metabolites mediating the deleterious effects of GL on the liver and islets, respectively. In detail, GL aggravates HFD-induced lipid synthesis and gluconeogenesis in the liver via the reduction of TCA, while triggering inflammation and cellular dysfunction in islets via the induction of AD. Collectively, our findings confirmed that GL and the HFD have a synergistic effect in the induction of metabolic disorders. All data supported the paper are present in the paper and/or the Supplementary Materials. The original datasets are also available from the corresponding author upon request. [Display omitted] •Green light exposure aggravates high-fat diet-induced metabolic disorders in mice.•Green light alters the serum levels of taurocholic acid and adenosine in mice.•Taurocholic acid alleviates hepatic steatosis via inhibiting glycolipid synthesis.•Adenosine impairs pancreatic insulin secretion in an inflammation-dependent manner.