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Rice bran oil ameliorates hepatic insulin resistance by improving insulin signaling in fructose fed-rats

  • Mona A. MohamedEmail author
  • Mervat A. Ahmed
  • Sohaier A. Abd Elbast
  • Nehad A. Ali
Research Article
  • 39 Downloads

Abstract

Background

Insulin resistance is an inadequate metabolic response of the peripheral tissue to circulating insulin. It plays an important pathophysiological role in type 2 diabetes mellitus. The purpose of the study was to investigate the molecular effects of rice bran oil (RBO) on the gene expression of insulin receptor (IR), insulin receptor substrate-1 (IRS-1), glucose transporters-4 and 5 (GLUT-4 and 5) in insulin-resistant rats induced by high fructose diet (HFD).

Methods

Rats were divided into six groups (10 rats each) as follows: Groups 1 and 2: rats received a standard diet with corn oil or RBO (as the sole source of fat), respectively. Group 3: animals fed on HFD, which was furtherly divided into 2 sub-groups: rats fed HFD either for one (HFD1) or for 2 months (HFD2). Group 4, rats fed HFD containing RBO for 1 month (HFD1 + RBO), while rats in group 5 fed HFD for 30 days then RBO was added to the diet for another 30 days (HFD2 + RBO). Serum levels of glucose and insulin, as well as hepatic gene expression of insulin receptors and glucose transporters were determined. Livers were isolated for histopathological study.

Results

HFD induced insulin resistance with a reduction in the hepatic level of insulin receptor and glucose transporters at both protein and molecular levels. Addition of RBO improved the insulin sensitivity and up-regulated the expression of the tested genes.

Conclusion

HFD impaired the insulin sensitivity of the hepatocytes by down-regulating the insulin receptor genes. Addition of RBO alleviated all the hazardous effects.

Keywords

Insulin resistance Rice bran oil Insulin receptors Glucose transporters 

Notes

Acknowledgments

Authors thank the laboratory technical staff in making specimens available for processing.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

40200_2019_394_MOESM1_ESM.docx (24 kb)
ESM 1 (DOCX 23 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Mona A. Mohamed
    • 1
    Email author
  • Mervat A. Ahmed
    • 2
  • Sohaier A. Abd Elbast
    • 2
  • Nehad A. Ali
    • 2
  1. 1.Biochemistry Division, Chemistry Department, Faculty of ScienceAl-Azhar UniversityCairoEgypt
  2. 2.Zoology Department, Faculty of ScienceAl-Azhar UniversityCairoEgypt

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