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Effects of octreotide on hepatic glycogenesis in rats with high fat diet‑induced obesity

  • Authors:
    • Xiao‑Xia Wang
    • Ting Ye
    • Mao Li
    • Xian Li
    • Ou Qiang
    • Cheng‑Wei Tang
    • Rui Liu
  • View Affiliations / Copyright

    Affiliations: Division of Peptides Related to Human Disease, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China, Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
    Copyright: © Wang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 109-118
    |
    Published online on: May 16, 2017
       https://doi.org/10.3892/mmr.2017.6586
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Abstract

Reduced hepatic glycogenesis is one of the most important causes of metabolic abnormalities in non‑alcoholic fatty liver disease. Octreotide, a somatostatin analogue, has been demonstrated to promote weight loss and improve metabolic disorders in mice with high fat diet (HFD)‑induced obesity. However, whether octreotide affects hepatic glycogenesis is unknown. The aim of the present study was to verify the effects of octreotide on hepatic glycogenesis in rats with HFD‑induced obesity. Male Sprague‑Dawley rats were fed a standard diet or a HFD for 24 weeks. Obese rats from the HFD group were further divided into a HFD‑control group and an octreotide‑administered group. Rats in the latter group were injected with octreotide for 8 days. Glucose and insulin tolerance tests were performed, and the area under the curve (AUC) was calculated. Following sacrifice, their body weights and lengths, fasting plasma glucose (FPG), fasting insulin (FINS), serum triglyceride (TG), total cholesterol (TC), free fatty acid (FFA), alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels were measured. In addition, Lee's index and the homeostatic model assessment index were calculated. Hepatic TG, FFA levels and glycogen content were first determined. Hepatic steatosis in the obese rats was assessed based on hematoxylin and eosin and Oil Red O staining. Human hepatoblastoma HepG2 cells were divided into a control group, a palmitate (PA)‑treated group and a PA + octreotide‑treated group. Establishment of the in vitro fatty liver model using HepG2 cells was confirmed by Oil Red O staining. The expression of phosphorylated Akt and glycogen synthase kinase 3β (GSK3β) was detected by western blotting, and glycogen synthase (GS) mRNA levels were detected by reverse transcription‑quantitative polymerase chain reaction. Compared with the control group, the body weight, Lee's index, AUC of the intraperitoneal glucose tolerance test and intraperitoneal insulin tolerance test, levels of FPG, FINS, TG, TC, FFA, ALT and AST, and HOMA index values were significantly increased in the obese rats. The body weight, levels of FPG and FINS, and the HOMA index were significantly reduced following octreotide treatment, whereas the decrease in Lee's index, the blood levels of ALT, AST, TC, TG and FFA, and the AUC did not reach statistical significance. Hepatic TG and FFA levels were significantly increased and hepatic glycogen content was significantly decreased in rats with HFD‑induced obesity when compared with those in the control group. Octreotide intervention restored these alterations. The expression levels of phosphorylated Akt and GSK3β protein expression, as well as GS mRNA levels in the HFD group were lower when compared with those in the control group, whereas octreotide treatment reversed these reductions. The in vitro experiments demonstrated that the reduced levels of phosphorylated Akt and GSK3β protein, and GS mRNA in the PA‑treated group were significantly reversed by octreotide treatment. In conclusion, the results indicate that octreotide improved hepatic glycogenesis and decreased FPG concentration in rats with HFD‑induced obesity. These mechanisms may be associated with increased GS activity via the promotion of GSK3β phosphorylation. Therefore, octreotide may be regarded as a novel therapeutic strategy for HFD‑induced obesity and obesity‑associated metabolic disorders.
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Copy and paste a formatted citation
Spandidos Publications style
Wang XX, Ye T, Li M, Li X, Qiang O, Tang CW and Liu R: Effects of octreotide on hepatic glycogenesis in rats with high fat diet‑induced obesity. Mol Med Rep 16: 109-118, 2017.
APA
Wang, X., Ye, T., Li, M., Li, X., Qiang, O., Tang, C., & Liu, R. (2017). Effects of octreotide on hepatic glycogenesis in rats with high fat diet‑induced obesity. Molecular Medicine Reports, 16, 109-118. https://doi.org/10.3892/mmr.2017.6586
MLA
Wang, X., Ye, T., Li, M., Li, X., Qiang, O., Tang, C., Liu, R."Effects of octreotide on hepatic glycogenesis in rats with high fat diet‑induced obesity". Molecular Medicine Reports 16.1 (2017): 109-118.
Chicago
Wang, X., Ye, T., Li, M., Li, X., Qiang, O., Tang, C., Liu, R."Effects of octreotide on hepatic glycogenesis in rats with high fat diet‑induced obesity". Molecular Medicine Reports 16, no. 1 (2017): 109-118. https://doi.org/10.3892/mmr.2017.6586
Copy and paste a formatted citation
x
Spandidos Publications style
Wang XX, Ye T, Li M, Li X, Qiang O, Tang CW and Liu R: Effects of octreotide on hepatic glycogenesis in rats with high fat diet‑induced obesity. Mol Med Rep 16: 109-118, 2017.
APA
Wang, X., Ye, T., Li, M., Li, X., Qiang, O., Tang, C., & Liu, R. (2017). Effects of octreotide on hepatic glycogenesis in rats with high fat diet‑induced obesity. Molecular Medicine Reports, 16, 109-118. https://doi.org/10.3892/mmr.2017.6586
MLA
Wang, X., Ye, T., Li, M., Li, X., Qiang, O., Tang, C., Liu, R."Effects of octreotide on hepatic glycogenesis in rats with high fat diet‑induced obesity". Molecular Medicine Reports 16.1 (2017): 109-118.
Chicago
Wang, X., Ye, T., Li, M., Li, X., Qiang, O., Tang, C., Liu, R."Effects of octreotide on hepatic glycogenesis in rats with high fat diet‑induced obesity". Molecular Medicine Reports 16, no. 1 (2017): 109-118. https://doi.org/10.3892/mmr.2017.6586
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