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Human Lactobacillus Strains from the Intestine can Suppress IgE-Mediated Degranulation of Rat Basophilic Leukaemia (RBL-2H3) Cells

Technical Research Laboratory, Takanashi Milk Products Co., Ltd., Yokohama 241-0023, Japan
Department of Food Bioscience and Biotechnology, College of Bioresource Sciences, Nihon University, Fujisawa 252-8510, Japan
Author to whom correspondence should be addressed.
Academic Editors: Haruki Kitazawa and Julio Villena
Microorganisms 2016, 4(4), 40;
Received: 15 August 2016 / Revised: 7 October 2016 / Accepted: 24 October 2016 / Published: 27 October 2016
(This article belongs to the Special Issue Probiotic Microorganisms: An Intimate Gaze)
Mast cells play a critical role in immunoglobulin E (IgE)-mediated allergic diseases, and the degranulation of mast cells is important in the pathogenesis of these diseases. A disturbance of the intestinal microflora, especially of endogenous lactic acid bacteria, might be a contributing factor for IgE-mediated allergic diseases. Additional knowledge regarding the interaction of human intestinal Lactobacilli with mast cells is still necessary. Twenty-three strains of Lactobacilli, including commercial and reference strains and strains from the human intestine, were tested for their ability to regulate degranulation of cells from rat basophilic leukemia RBL-2H3 cells (RBL-2H3) in vitro based on a β-hexosaminidase release assay. Each of the tested Lactobacilli characteristically suppressed IgE-mediated degranulation of RBL-2H3 cells, and Lactobacillus GG showed the strongest inhibitory effect on the cells. Furthermore, the bacteria isolated from the human intestine significantly suppressed degranulation of RBL-2H3 cellsin comparison with the reference strains. These results suggest that Lactobacilli, particularly those from the human intestine, can affect the activation of mast cells in a strain-dependent manner. Further study should be conducted to analyse the understanding mechanism. View Full-Text
Keywords: degranulation; IgE-mediated allergy; Lactobacilli; mast cell degranulation; IgE-mediated allergy; Lactobacilli; mast cell
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Harata, G.; He, F.; Takahashi, K.; Hosono, A.; Miyazawa, K.; Yoda, K.; Hiramatsu, M.; Kaminogawa, S. Human Lactobacillus Strains from the Intestine can Suppress IgE-Mediated Degranulation of Rat Basophilic Leukaemia (RBL-2H3) Cells. Microorganisms 2016, 4, 40.

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