Annatto-extracted tocotrienols improve glucose homeostasis and bone properties in high-fat diet-induced type 2 diabetic mice by decreasing the inflammatory response

Chwan-Li Shen, Gurvinder Kaur, Desiree Wanders, Shaligram Sharma, Michael D Tomison, Latha Ramalingam, Eunhee Chung, Naima Moustaid-Moussa, Huanbiao Mo, Jannette M Dufour

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Diabetes is a risk factor for osteoporosis. Annatto-extracted tocotrienols (TT) have proven benefits in preserving bone matrix. Here, we evaluated the effects of dietary TT on glucose homeostasis, bone properties, and liver pro-inflammatory mRNA expression in high-fat diet (HFD)-induced type 2 diabetic (T2DM) mice. 58 male C57BL/6 J mice were divided into 5 groups: low-fat diet (LFD), HFD, HFD + 400 mgTT/kg diet (T400), HFD + 1600 mgTT/kg diet (T1600), and HFD + 200 mg metformin/kg (Met) for 14 weeks. Relative to the HFD group, both TT-supplemented groups (1) improved glucose homeostasis by lowering the area under the curve for both glucose tolerance and insulin tolerance tests, (2) increased serum procollagen I intact N-terminal propeptide (bone formation) level, trabecular bone volume/total volume, trabecular number, connectivity density, and cortical thickness, (3) decreased collagen type 1 cross-linked C-telopeptide (bone resorption) levels, trabecular separation, and structure model index, and (4) suppressed liver mRNA levels of inflammation markers including IL-2, IL-23, IFN-γ, MCP-1, TNF-α, ITGAX and F4/80. There were no differences in glucose homeostasis and liver mRNA expression among T400, T1600, and Met. The order of osteo-protective effects was LFD ≥T1600 ≥T400 = Met >HFD. Collectively, these data suggest that TT exerts osteo-protective effects in T2DM mice by regulating glucose homeostasis and suppressing inflammation.

Original languageEnglish (US)
Pages (from-to)11377
JournalScientific reports
Volume8
Issue number1
DOIs
StatePublished - Jul 27 2018
Externally publishedYes

Keywords

  • Animals
  • Biomarkers/blood
  • Bixaceae
  • Blood Glucose/metabolism
  • Body Weight
  • Bone Remodeling/drug effects
  • Bone and Bones/drug effects
  • Carotenoids/pharmacology
  • Diabetes Mellitus, Experimental/pathology
  • Diabetes Mellitus, Type 2/pathology
  • Diet, High-Fat
  • Feeding Behavior
  • Homeostasis/drug effects
  • Inflammation/pathology
  • Liver/drug effects
  • Male
  • Mice, Inbred C57BL
  • Pancreas/drug effects
  • Plant Extracts/pharmacology
  • RNA, Messenger/genetics
  • Tocotrienols/pharmacology
  • Water

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