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These events are associated with trained immunity and have long-term impacts on hematopoietic stem and progenitor cell (HSPC) development but can also compromise their function. While many cytokines support emergency myelopoiesis, less is known about the mechanisms that temper these events. When mice that lack the cytokine IL-27 were infected with\n                    <jats:italic>Toxoplasma gondii<\/jats:italic>\n                    , there was enhanced generation of monocyte progenitors and increased numbers of inflammatory monocytes. In the bone marrow of infected mice, there was increased production of IL-27 that localized with HSPCs, and a survey of cytokine receptor expression highlighted that HSPCs were uniquely poised to respond to IL-27. Furthermore, the use of in vitro differentiation assays and mixed bone marrow chimeras revealed that HSPCs from IL-27-deficient mice are predisposed toward the monocyte lineage. Additional studies highlighted that after infection, loss of the IL-27R resulted in reduced HSPC fitness that manifested as reduced proliferative responses and a decreased ability to reconstitute the hematopoietic system. Thus, the ability of IL-27 to act on HSPC provides a regulatory brake on differentiation to limit monocyte induction and preserve HSPC stemness.\n                  <\/jats:p>","DOI":"10.7554\/elife.105876","type":"journal-article","created":{"date-parts":[[2025,4,23]],"date-time":"2025-04-23T10:30:46Z","timestamp":1745404246000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.105876","source":"Crossref","is-referenced-by-count":2,"title":["IL-27 limits HSPC differentiation during infection and protects from stem cell exhaustion"],"prefix":"10.7554","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2224-5159","authenticated-orcid":true,"given":"Daniel L","family":"Aldridge","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03zzmyz63","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Pennsylvania School of Veterinary Medicine","place":["Philadelphia, United 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