{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T14:23:41Z","timestamp":1792679021756,"version":"4.5.0"},"reference-count":56,"publisher":"Oxford University Press (OUP)","issue":"7","license":[{"start":{"date-parts":[[2017,4,1]],"date-time":"2017-04-01T00:00:00Z","timestamp":1491004800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2017,4,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>After foodborne transmission of the facultative intracellular bacterial pathogen Listeria monocytogenes, most of the bacterial burden in the gut is extracellular. However, we previously demonstrated that intracellular replication in an as yet unidentified cell type was essential for dissemination and systemic spread of L. monocytogenes. In this article, we show that the vast majority of cell-associated L. monocytogenes in the gut were adhered to Ly6Chi monocytes, a cell type that inefficiently internalized L. monocytogenes. With bone marrow\u2013derived in vitro cultures, high multiplicity of infection or the use of opsonized bacteria enhanced uptake of L. monocytogenes in CD64\u2212 monocytes, but very few bacteria reached the cell cytosol. Surprisingly, monocytes that had upregulated CD64 expression in transition toward becoming macrophages fully supported intracellular growth of L. monocytogenes. In contrast, inflammatory monocytes that had increased CD64 expression in the bone marrow of BALB\/c\/By\/J mice prior to L. monocytogenes exposure in the gut did not support L. monocytogenes growth. Thus, contrary to the perception that L. monocytogenes can infect virtually all cell types, neither naive nor inflammatory Ly6Chi monocytes served as a productive intracellular growth niche for L. monocytogenes. These results have broad implications for innate immune recognition of L. monocytogenes in the gut and highlight the need for additional studies on the interaction of extracellular, adherent L. monocytogenes with the unique subsets of myeloid-derived inflammatory cells that infiltrate sites of infection.<\/jats:p>","DOI":"10.4049\/jimmunol.1602076","type":"journal-article","created":{"date-parts":[[2017,2,17]],"date-time":"2017-02-17T20:25:36Z","timestamp":1487363136000},"page":"2796-2804","source":"Crossref","is-referenced-by-count":36,"title":["Monocytes Are the Predominant Cell Type Associated with\n                    <i>Listeria monocytogenes<\/i>\n                    in the Gut, but They Do Not Serve as an Intracellular Growth Niche"],"prefix":"10.1093","volume":"198","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7945-8038","authenticated-orcid":false,"given":"Grant S","family":"Jones","sequence":"first","affiliation":[{"name":"Department of Microbiology, Immunology, and Molecular Genetics, University of Kentucky College of Medicine , Lexington, KY 40536"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah E F","family":"D\u2019Orazio","sequence":"additional","affiliation":[{"name":"Department of Microbiology, Immunology, and Molecular Genetics, University of Kentucky College of Medicine , Lexington, KY 40536"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2017,4,1]]},"reference":[{"key":"2025030615081065100_r1","doi-asserted-by":"crossref","first-page":"2822","DOI":"10.1128\/iai.55.11.2822-2829.1987","article-title":"In vitro model of penetration and intracellular growth of Listeria monocytogenes in the human enterocyte-like cell line Caco-2","volume":"55","author":"Gaillard","year":"1987","journal-title":"Infect. 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