Innate immunity induced by fungal β-glucans via dectin-1 signaling pathway

Dong Hee Lee, Ha Won Kim

Research output: Contribution to journalReview article

41 Scopus citations

Abstract

Mushrooms are a highly valuable source of substances that possess unique biological properties and medicinal effcacy. Medicinal mushrooms traditionally have been used to treat cancer, fungal infections, hypertension, diabetes, inflammation, and renal disorders. Medicinal mushrooms produce high-molecular-weight β-glucans, which have antitumor and antifungal activities that stimulate innate immunity. Innate immune cells express pattern recognition receptors (PRRs) such as dectin-1, Toll-like receptors, and mannose receptors on their cell surfaces. These PRRs recognize pathogens by binding to highly conserved pathogen-associated molecular patterns such as β-glucan, mannan, and lipopolysaccharide. The immunomodulating activities of innate immune cells are augmented by the binding of β-glucans to dectin-1 that is expressed by macrophages or dendritic cells. Upon binding β-glucan, innate immune cells activate adaptive immune cells such as B and T lymphocytes or natural killer cells by secreting various cytokines such as interleukins (IL-4, IL-6) and tumor necrosis factor-α. Water-insoluble β-glucans have stronger immunostimulating activities than their water-soluble counterparts. β-glucans have antifungal activity that is similar to their anticancer activities and is mediated by binding to dectin-1, albeit by an unknown mechanism. In this review we discuss recent progress in understanding the mechanisms responsible for the antitumor activities of fungal β-glucans that act through pathogen-associated molecular patterns and PRRs.

Original languageEnglish (US)
Pages (from-to)1-16
Number of pages16
JournalInternational Journal of Medicinal Mushrooms
Volume16
Issue number1
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

Keywords

  • 2-stage model
  • Anticancer
  • Complement receptor 3
  • Dectin-1
  • Innate immunity
  • Medicinal mushrooms
  • PAMP
  • PRR
  • Toll-like receptor
  • β-glucan
  • β-glucan intestinal absorption

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology
  • Pharmacology
  • Drug Discovery

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