Mannose-capped lipoarabinomannan-induced B10 cells decrease severity of dextran sodium sulphate-induced inflammatory...

Area of Science:

• Immunology
• Gastroenterology
• Microbiology

Background:

• Inflammatory bowel disease (IBD), encompassing Crohn's disease and ulcerative colitis, is a chronic gastrointestinal inflammatory condition with unclear etiology.
• Regulatory B10 cells, which produce interleukin-10 (IL-10), are crucial for intestinal homeostasis, and their altered frequency is linked to IBD.
• Mannose-capped lipoarabinomannan (ManLAM), a lipoglycan from Mycobacterium tuberculosis, has been identified as an inducer of B10 cells.

Purpose of the Study:

• To investigate the therapeutic potential of ManLAM-induced B10 cells in a dextran sodium sulfate (DSS)-induced mouse model of IBD.
• To elucidate the immunomodulatory mechanisms by which ManLAM-induced B10 cells affect colitis.

Main Methods:

• Adoptive transfer of ManLAM-induced B10 cells into IL-10 knockout mice.
• Induction of colitis using DSS in the recipient mice.
• Assessment of colitis severity and analysis of T helper cell polarization in spleen and mesenteric lymph nodes.

Main Results:

• Adoptive transfer of ManLAM-induced B10 cells significantly decreased the severity of DSS-induced colitis.
• These B10 cells were found to downregulate Th1 polarization in both the spleen and mesenteric lymph nodes of DSS-treated mice.
• The protective effect correlated with IL-10 production by the transferred B cells.

Conclusions:

• ManLAM-induced B10 cells possess therapeutic potential for mitigating experimental colitis.
• IL-10 production by ManLAM-stimulated B cells plays a key role in maintaining CD4+ T cell subset balance.
• This study highlights a novel strategy involving B10 cell modulation for managing IBD.