Oral D-mannose treatment suppresses experimental autoimmune encephalomyelitis via induction of regulatory T cells

J Neuroimmunol. 2022 Jan 15;362:577778. doi: 10.1016/j.jneuroim.2021.577778. Epub 2021 Nov 18.

Abstract

D-mannose (D-m) is a glucose epimer found in natural products, especially fruits. In mouse models of diabetes and airway inflammation, D-m supplementation via drinking water attenuated pathology by modifying cellular energy metabolism, leading to the activation of latent transforming growth factor beta (TGF-β), which in turn induced T regulatory cells (Tregs). Given that Tregs are important in controlling neuroinflammation in experimental autoimmune encephalomyelitis (EAE) and likely in multiple sclerosis (MS), we hypothesized that D-m could also suppress EAE. We found that D-m delayed disease onset and reduced disease severity in two models of EAE. Importantly, D-m treatment prevented relapses in a relapsing-remitting model of EAE, which mimics the most common clinical manifestation of MS. EAE suppression was accompanied by increased frequency of CD4+FoxP3+ Tregs in the central nervous system, suggesting that EAE suppression resulted from Treg cell induction by D-m. These findings suggest that D-m has the potential to be a safe and low-cost complementary therapy for MS.

Keywords: D-mannose; Experimental autoimmune encephalomyelitis; Multiple sclerosis; Regulatory T cells.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Administration, Oral
  • Animals
  • Encephalomyelitis, Autoimmune, Experimental / immunology*
  • Encephalomyelitis, Autoimmune, Experimental / pathology*
  • Female
  • Mannose / pharmacology*
  • Mice
  • T-Lymphocytes, Regulatory / drug effects*

Substances

  • Mannose