{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T18:38:19Z","timestamp":1791398299865,"version":"4.3.3"},"reference-count":79,"publisher":"Rockefeller University Press","issue":"10","content-domain":{"domain":["rupress.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2009,9,28]]},"abstract":"<jats:p>Natural killer (NK) cells have the potential to deliver both direct antimicrobial effects and regulate adaptive immune responses, but NK cell yields have been reported to vary greatly during different viral infections. Activating receptors, including the Ly49H molecule recognizing mouse cytomegalovirus (MCMV), can stimulate NK cell expansion. To define Ly49H's role in supporting NK cell proliferation and maintenance under conditions of uncontrolled viral infection, experiments were performed in Ly49h\u2212\/\u2212, perforin 1 (Prf1)\u2212\/\u2212, and wild-type (wt) B6 mice. NK cell numbers were similar in uninfected mice, but relative to responses in MCMV-infected wt mice, NK cell yields declined in the absence of Ly49h and increased in the absence of Prf1, with high rates of proliferation and Ly49H expression on nearly all cells. The expansion was abolished in mice deficient for both Ly49h and Prf1 (Ly49h\u2212\/\u2212Prf1\u2212\/\u2212), and negative consequences for survival were revealed. The Ly49H-dependent protection mechanism delivered in the absence of Prf1 was a result of interleukin 10 production, by the sustained NK cells, to regulate the magnitude of CD8 T cell responses. Thus, the studies demonstrate a previously unappreciated critical role for activating receptors in keeping NK cells present during viral infection to regulate adaptive immune responses.<\/jats:p>","DOI":"10.1084\/jem.20082387","type":"journal-article","created":{"date-parts":[[2009,8,31]],"date-time":"2009-08-31T21:43:22Z","timestamp":1251755002000},"page":"2235-2251","update-policy":"https:\/\/doi.org\/10.1084\/jem.crossmarkpolicy","source":"Crossref","is-referenced-by-count":200,"title":["Activating receptors promote NK cell expansion for maintenance, IL-10 production, and CD8 T cell regulation during viral infection"],"prefix":"10.1084","volume":"206","author":[{"given":"Seung-Hwan","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Molecular Microbiology and Immunology, Division of Biology and Medicine, Brown University, Providence, RI 02912 1"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kwang-Sin","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Molecular Microbiology and Immunology, Division of Biology and Medicine, Brown University, Providence, RI 02912 1"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nassima","family":"Fodil-Cornu","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Immunology, McGill University, Montreal, Quebec H3A 2T5, Canada 2"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Silvia M.","family":"Vidal","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Immunology, McGill University, Montreal, Quebec H3A 2T5, Canada 2"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christine A.","family":"Biron","sequence":"additional","affiliation":[{"name":"Department of Molecular Microbiology and Immunology, Division of Biology and Medicine, Brown University, Providence, RI 02912 1"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"291","published-online":{"date-parts":[[2009,8,31]]},"reference":[{"key":"2023072917332193900_bib1","doi-asserted-by":"publisher","first-page":"6798","DOI":"10.1128\/JVI.00256-09","article-title":"HLA class I subtype-dependent expansion of KIR3DS1+ and KIR3DL1+ NK cells during acute human immunodeficiency virus type 1 infection","volume":"83","author":"Alter","year":"2009","journal-title":"J. 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