Modulatory effect of concomitant administration of sitagliptin and vitamin e on inflammatory biomarkers in rats fed with high fat diet: Role of adiponectin

H. F. Sakr*, A. M. Abbas, K. Khalil, A. M. Shata

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Sitagliptin (SIT) is an antidiabetic used worldwide to ameliorate the hyperglycemia and insulin insensitivity induced dysmetabolism. In this study, we investigated the effect of sitagliptin and vitamin E on metabolic dysfunction in high-fat diet (HFD) fed rats. Sixty-four male rats were allocated into 8 groups (n = 8) as follow; control, control + vitamin E, control + sitagliptin, control + sitagliptin + vitamin E, HFD, HFD + vitamin E, HFD + sitagliptin and HFD + sitagliptin + vitamin E. Control groups were fed with chow diet for 15 weeks, while HFD groups were fed with HFD for the same duration. Vitamin E and sitagliptin were administered in the last 4 weeks of the study. At the end of the 15th week, body weight, liver weight/body weight ratio, weight gain, glucose, lipid profile, liver enzymes, adiponectin and pro-inflammatory cytokines as interleukin 6 (IL-6), high sensitive C reactive protein (hs-CRP) and tumour necrosis factor-α (TNF-α) were measured. Additionally, gene expressions of senescence marker protein 30 (SMP30), Bcl-2, and Bax were measured. Total antioxidant capacity (TAC) and thiobaribituric acid reactive substances (TBARS) were assayed. HFD increased TBARS, IL-6, hs-CRP and TNF-α significantly and decreased TAC and adiponectin. Sitagliptin produced a comparable result through increasing adiponectin, sitagliptin alone or in combination with vitamin E increased the TAC, and gene expression of SMP30 and Bcl-2 and decreased TBARS with downregulation of the overexpressed Bax. Vitamin E, as a natural antioxidant, ameliorates the oxidative stress with insignificant change in lipid profile and inflammatory cytokine levels. Concomitant sitagliptin and vitamin E reduced the hepatic dysfunction induced by HFD.

Original languageEnglish
Pages (from-to)955-967
Number of pages13
JournalJournal of Physiology and Pharmacology
Issue number6
Publication statusPublished - Dec 2019


  • Adiponectin
  • C-reactive protein
  • Hypercholesterolemia
  • Non-alcoholic fatty liver disease
  • Oxidative stress
  • Senescence marker protein 30
  • Sitagliptin
  • Type 2 diabetes mellitus
  • Vitamin E

ASJC Scopus subject areas

  • Physiology
  • Pharmacology


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