Mouse Ly49G2+ NK cells dominate early responses during both immune reconstitution and activation independently of MHC.
Blood
; 117(26): 7032-41, 2011 Jun 30.
Article
em En
| MEDLINE
| ID: mdl-21498673
ABSTRACT
Natural killer (NK) cell subsets can be defined by the differential expression of inhibitory receptors for MHC class I molecules. Early after congenic HSCT, we found that Ly49G2(high) single-positive NK cells repopulated, displayed an activated phenotype, and were highly cytolytic. Over time, this subset was replaced with NK cells with a normal pattern of Ly49 expression. Treatment of mice with IL-2 also resulted in the rapid expansion of these Ly49G2(high) single-positive NK cells. Only the Ly49g (Klra7) Pro1 transcript was highly induced in both HSCT- and IL-2-treated recipients. MHC-independent expansion of the Ly49G2(+) subset was also observed after Listeria monocytogenes or mouse cytomegalovirus infection. Our data indicate that during reconstitution after HSCT and various activation stimuli, Ly49G2(+) NK cells represent the "first-responder" NK cells, which occur independently of NK-cell licensing via Ly49-MHC interactions. These data suggest that the inhibitory Ly49G2 receptor represents an activation marker on mouse NK cells under various conditions.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Células Matadoras Naturais
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Ativação Linfocitária
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Receptores Imunológicos
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Transplante de Células-Tronco Hematopoéticas
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Sobrevivência de Enxerto
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Complexo Principal de Histocompatibilidade
Limite:
Animals
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article