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Ly49C-Dependent Control of MCMV Infection by NK Cells Is -Regulated by MHC Class I Molecules


We previously identified a viral murine cytomegalovirus (MCMV) strain whose variant m157 immunoevasin can bind the inhibitory Ly49C NK cell receptor in addition to activating Ly49H receptor in B6 mice. Here we show that simultaneous engagement of the two receptors by m157 hampers NK cell activation. Most Ly49H+ NK cells lack Ly49C in B6 mice, as a result, NK cell population efficiently controls MCMV infection; however, the anti-viral response is reduced in transgenic mice where all NK cells express Ly49C. MHC I masks Ly49C through cis-interactions, which restricts its inhibitory function. Indeed, B6 Ly49C Tg, β2m ko mice, that are deficient for MHC I, are highly susceptible to low dose of MCMV. Our findings indicate that both the NK cell repertoire and MHC I molecules control susceptibility vs resistance to viral infections.


Vyšlo v časopise: Ly49C-Dependent Control of MCMV Infection by NK Cells Is -Regulated by MHC Class I Molecules. PLoS Pathog 10(5): e32767. doi:10.1371/journal.ppat.1004161
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.ppat.1004161

Souhrn

We previously identified a viral murine cytomegalovirus (MCMV) strain whose variant m157 immunoevasin can bind the inhibitory Ly49C NK cell receptor in addition to activating Ly49H receptor in B6 mice. Here we show that simultaneous engagement of the two receptors by m157 hampers NK cell activation. Most Ly49H+ NK cells lack Ly49C in B6 mice, as a result, NK cell population efficiently controls MCMV infection; however, the anti-viral response is reduced in transgenic mice where all NK cells express Ly49C. MHC I masks Ly49C through cis-interactions, which restricts its inhibitory function. Indeed, B6 Ly49C Tg, β2m ko mice, that are deficient for MHC I, are highly susceptible to low dose of MCMV. Our findings indicate that both the NK cell repertoire and MHC I molecules control susceptibility vs resistance to viral infections.


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Hygiena a epidemiológia Infekčné lekárstvo Laboratórium

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