Lactic acid suppresses IgE-mediated mast cell function in vitro and in vivo.

Lactic acid suppresses IgE-mediated mast cell function in vitro and in vivo. Cell Immunol. 2019 Apr 12;: Authors: Abebayehu D, Spence AJ, Caslin H, Taruselli M, Haque TT, Kiwanuka KN, Kolawole EM, Chumanevich AP, Sell SA, Oskeritzian CA, Ryan J, Kee SA Abstract Mast cells have functional plasticity affected by their tissue microenvironment, which greatly impacts their inflammatory responses. Because lactic acid (LA) is abundant in inflamed tissues and tumors, we investigated how it affects mast cell function. Using IgE-mediated activation as a model system, we found that LA suppressed inflammatory cytokine production and degranulation in mouse peritoneal mast cells, data that were confirmed with human skin mast cells. In mouse peritoneal mast cells, LA-mediated cytokine suppression was dependent on pH- and monocarboxylic transporter-1 expression. Additionally, LA reduced IgE-induced Syk, Btk, and ERK phosphorylation, key signals eliciting inflammation. In vivo, LA injection reduced IgE-mediated hypothermia in mice undergoing passive systemic anaphylaxis. Our data suggest that LA may serve as a feedback inhibitor that limits mast cell-mediated inflammation. PMID: 31030957 [PubMed - as supplied by publisher]
Source: Cellular Immunology - Category: Allergy & Immunology Authors: Tags: Cell Immunol Source Type: research