{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T03:37:47Z","timestamp":1790653067084,"version":"4.1.0"},"update-to":[{"DOI":"10.1371\/journal.ppat.1009781","type":"new_version","label":"New version","source":"publisher","updated":{"date-parts":[[2021,7,29]],"date-time":"2021-07-29T00:00:00Z","timestamp":1627516800000}}],"reference-count":159,"publisher":"Public Library of Science (PLoS)","issue":"7","license":[{"start":{"date-parts":[[2021,7,19]],"date-time":"2021-07-19T00:00:00Z","timestamp":1626652800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"NIH-NIAID","award":["R21 AI137458"],"award-info":[{"award-number":["R21 AI137458"]}]},{"name":"NIH-NIGMS","award":["T32 GM008061"],"award-info":[{"award-number":["T32 GM008061"]}]}],"content-domain":{"domain":["www.plospathogens.org"],"crossmark-restriction":false},"short-container-title":["PLoS Pathog"],"abstract":"<jats:p>Cytokines made by macrophages play a critical role in determining the course of<jats:italic>Legionella pneumophila<\/jats:italic>infection. Prior murine-based modeling indicated that this cytokine response is initiated upon recognition of<jats:italic>L<\/jats:italic>.<jats:italic>pneumophila<\/jats:italic>by a subset of Toll-like receptors, namely TLR2, TLR5, and TLR9. Through the use of shRNA\/siRNA knockdowns and subsequently CRISPR\/Cas9 knockouts (KO), we determined that TRIF, an adaptor downstream of endosomal TLR3 and TLR4, is required for full cytokine secretion by human primary and cell-line macrophages. By characterizing a further set of TLR KO\u2019s in human U937 cells, we discerned that, contrary to the viewpoint garnered from murine-based studies, TLR3 and TLR4 (along with TLR2 and TLR5) are in fact vital to the macrophage response in the early stages of<jats:italic>L<\/jats:italic>.<jats:italic>pneumophila<\/jats:italic>infection. This conclusion was bolstered by showing that i) chemical inhibitors of TLR3 and TLR4 dampen the cytokine output of primary human macrophages and ii) transfection of TLR3 and TLR4 into HEK cells conferred an ability to sense<jats:italic>L<\/jats:italic>.<jats:italic>pneumophila<\/jats:italic>. TLR3- and TLR4-dependent cytokines promoted migration of human HL-60 neutrophils across an epithelial layer, pointing to the biological importance for the newfound signaling pathway. The response of U937 cells to<jats:italic>L<\/jats:italic>.<jats:italic>pneumophila<\/jats:italic>LPS was dependent upon TLR4, a further contradiction to murine-based studies, which had concluded that TLR2 is the receptor for<jats:italic>Legionella<\/jats:italic>LPS. Given the role of TLR3 in sensing nucleic acid (i.e., dsRNA), we utilized newly-made KO U937 cells to document that DNA-sensing by cGAS-STING and DNA-PK are also needed for the response of human macrophages to<jats:italic>L<\/jats:italic>.<jats:italic>pneumophila<\/jats:italic>. Given the lack of attention given them in the bacterial field, C-type lectin receptors were similarly examined; but, they were not required. Overall, this study arguably represents the most extensive, single-characterization of<jats:italic>Legionella<\/jats:italic>-recognition receptors within human macrophages.<\/jats:p>","DOI":"10.1371\/journal.ppat.1009781","type":"journal-article","created":{"date-parts":[[2021,7,19]],"date-time":"2021-07-19T17:38:21Z","timestamp":1626716301000},"page":"e1009781","update-policy":"https:\/\/doi.org\/10.1371\/journal.ppat.corrections_policy","source":"Crossref","is-referenced-by-count":26,"title":["Human macrophages utilize a wide range of pathogen recognition receptors to recognize Legionella pneumophila, including Toll-Like Receptor 4 engaging Legionella lipopolysaccharide and the Toll-like Receptor 3 nucleic-acid sensor"],"prefix":"10.1371","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9083-8805","authenticated-orcid":true,"given":"Lubov 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