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J Gastroenterol Hepatol. 2014 Dec;29(12):1976-84. doi: 10.1111/jgh.12701.

Differential stimulation of peripheral blood mononuclear cells in Crohn's disease by fungal glycans.

Author information

1
IBD Center, Department of Gastroenterology and Liver Diseases and The Research Center for Digestive Tract and Liver Diseases, Tel Aviv Medical Center, Tel Aviv, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.

Abstract

BACKGROUND AND AIM:

Crohn's disease (CD) is characterized by loss of tolerance to intestinal microorganisms. This is reflected by serological responses to fungal glycans such as mannan and β-glucans. Fungal glycans have various effects on immune cells. However, the evidence for their effects in CD is vague. This study aimed to assess the effects of fungal cell wall glycans on human peripheral blood mononuclear cells (PBMCs) from CD and control patients.

METHODS:

Human PBMCs from CD and control patients were stimulated by fungal cell wall glycans. Cytokine secretion was detected by ELISA and glycan receptor expression by flow cytometry.

RESULTS:

Mannan, β-glucans (curdlan), chitosan, and zymosan induced the secretion of interleukin (IL)-1β, IL-6, IL-23, IL-10, and tumor necrosis factor-α by PBMCs. Spleen tyrosin kinase and Src tyrosine kinase were involved in the response to mannan and β-glucans. Mannan and whole yeast cells induced a significantly higher pro-inflammatory cytokine response in CD compared with control patients.

CONCLUSIONS:

The results may suggest that CD is characterized by hyperresponsiveness to fungal glycans. Thus, glycans may potentially be triggering or perpetuating inflammation.

KEYWORDS:

Crohn's disease; anti-glycan antibodies; cytokines; mannan.; β-glucans

PMID:
25092526
DOI:
10.1111/jgh.12701
[Indexed for MEDLINE]

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