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The role of human mast cells (hMCs) during Mab infection remains poorly characterised. This study examines early interactions between Mab and hMCs, evaluating MC viability, degranulation, reactive oxygen species (ROS) production, cytokine secretion, and receptor expression following Mab exposure. MCs interacted with both smooth (ATCC 19977) and rough (clinical isolate) Mab morphotypes. Infection did not induce MC degranulation. Instead, Mab primarily stimulated intracellular ROS generation, Granzyme B, and IL-1\u03b2 production. CD18 and CD46 were necessary for hMC-Mab interactions, and CD18 deficiency significantly impacted ROS production. hMC cytokine priming with IL-33 or IFN-\u03b3 did not significantly affect CD18 expression, nor did it impact ROS production upon Mab infection. These findings demonstrate that MCs mount a rapid, receptor-dependent intracellular response to Mab, highlighting an early and previously underappreciated role of MCs in Mab infection.<\/jats:p>","DOI":"10.3390\/cells15151385","type":"journal-article","created":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T08:20:18Z","timestamp":1785486018000},"page":"1385","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Mycobacterium abscessus Induces CD18-Dependent Reactive Oxygen Species Production in Human Mast Cells"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3643-5658","authenticated-orcid":false,"given":"Ilse","family":"Mendoza-Trujillo","sequence":"first","affiliation":[{"name":"Lydia Becker Institute of Immunology and Inflammation, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4493-3091","authenticated-orcid":false,"given":"Patricia","family":"Diez-Echave","sequence":"additional","affiliation":[{"name":"Allergy Research Group, Instituto de Investigaci\u00f3n Biom\u00e9dica de M\u00e1laga y Plataforma en Nanomedicina-IBIMA Plataforma BIONAND, 29590 M\u00e1laga, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chiara","family":"Tontini","sequence":"additional","affiliation":[{"name":"Lydia Becker Institute of Immunology and Inflammation, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rajia","family":"Bahri","sequence":"additional","affiliation":[{"name":"Lydia Becker Institute of Immunology and Inflammation, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer S.","family":"Cavet","sequence":"additional","affiliation":[{"name":"Lydia Becker Institute of Immunology and Inflammation, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8867-455X","authenticated-orcid":false,"given":"Lydia","family":"Tabernero","sequence":"additional","affiliation":[{"name":"Lydia Becker Institute of Immunology and Inflammation, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5764-8516","authenticated-orcid":false,"given":"Silvia","family":"Bulfone-Paus","sequence":"additional","affiliation":[{"name":"Lydia Becker Institute of Immunology and Inflammation, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,7,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"911","DOI":"10.1016\/j.femsre.2005.02.001","article-title":"Mycobacteria in Drinking Water Distribution Systems: Ecology and Significance for Human Health","volume":"29","author":"Vaerewijck","year":"2005","journal-title":"FEMS Microbiol. 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