uni-leipzig-open-access/json/s41598-023-45898-3

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Vaccinologists strive to harness this so far underexplored branch of the immune system for new vaccines against tuberculosis. A particular division of DURTs are T cells that recognize their cognate lipid antigen in the context of CD1-molecules. Mycobacteria are characterized by a particular lipid-rich cell wall. Several of these lipids have been shown to be presented to T cells via CD1b-molecules. Guinea pigs functionally express CD1b and are hence an appropriate small animal model to study the role of CD1b-restricted, lipid-specific immune responses. In the current study, guinea pigs were vaccinated with BCG or highly-purified, liposome-formulated phosphatidylinositol-hexa-mannoside (PIM<jats:sub>6<\/jats:sub>) to assess the effect of CD1-restricted DURTs on the course of infection after virulent <jats:italic>Mycobacterium tuberculosis<\/jats:italic> (<jats:italic>Mtb<\/jats:italic>) challenge. Robust PIM<jats:sub>6<\/jats:sub>-specific T cell-responses were observed both after BCG- and PIM<jats:sub>6<\/jats:sub>-vaccination. The cellular response was significantly reduced in the presence of monoclonal, CD1b-blocking antibodies, indicating that a predominant part of this reactivity was CD1b-restricted. When animals were challenged with <jats:italic>Mtb<\/jats:italic>, BCG- and PIM<jats:sub>6<\/jats:sub>-vaccinated animals showed significantly reduced pathology, smaller necrotic granulomas in lymph node and spleen and reduced bacterial loads. While BCG conferred an almost sterile protection in this setting, compared to control animals\u2019 lesions were reduced roughly by two thirds in PIM<jats:sub>6<\/jats:sub>-vaccinated. Comprehensive histological and transcriptional analyses in the draining lymph node revealed that protected animals showed reduced transcription-levels of inflammatory cyto- and chemokines and higher levels of CD1b-expression on professional antigen cells compared to controls. Although BCG as a comparator induced by far stronger effects, our observations in the guinea pig model suggest that CD1b-restricted, PIM<jats:sub>6<\/jats:sub>-reactive DURTs contribute to immune-mediated containment of virulent <jats:italic>Mtb<\/jats:italic>.<\/jats:p>","DOI":"10.1038\/s41598-023-45898-3","type":"journal-article","created":{"date-parts":[[2023,10,30]],"date-time":"2023-10-30T12:02:33Z","timestamp":1698667353000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Phosphatidylinositolmannoside vaccination induces lipid-specific Th1-responses and partially protects guinea pigs from Mycobacterium tuberculosis challenge"],"prefix":"10.1038","volume":"13","author":[{"given":"Emmelie","family":"Eckhardt","sequence":"first","affiliation":[]},{"given":"Jan","family":"Schink\u00f6the","sequence":"additional","affiliation":[]},{"given":"Marcel","family":"Gischke","sequence":"additional","affiliation":[]},{"given":"Julia","family":"Sehl-Ewert","sequence":"additional","affiliation":[]},{"given":"Bj\u00f6rn","family":"Corleis","sequence":"additional","affiliation":[]},{"ORCID":"http:\/\/orcid.org\/0000-0003-1739-749X","authenticated-orcid":false,"given":"Anca","family":"Dorhoi","sequence":"additional","affiliation":[]},{"given":"Jens","family":"Teifke","sequence":"additional","affiliation":[]},{"given":"Dirk","family":"Albrecht","sequence":"additional","affiliation":[]},{"given":"Annemieke","family":"Geluk","sequence":"additional","affiliation":[]},{"given":"Martine","family":"Gilleron","sequence":"additional","affiliation":[]},{"ORCID":"http:\/\/orcid.org\/0000-0001-7926-8568","authenticated-orcid":false,"given":"Max","family":"Bastian","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,10,30]]},"reference":[{"key":"45898_CR1","doi-asserted-by":"publisher","first-page":"656","DOI":"10.1038\/nrmicro1211","volume":"3","author":"P Andersen","year":"2005","unstructured":"Andersen, P. & Doherty, T. 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