| First Author | Cook KD | Year | 2015 |
| Journal | J Leukoc Biol | Volume | 98 |
| Issue | 2 | Pages | 153-62 |
| PubMed ID | 25986014 | Mgi Jnum | J:242744 |
| Mgi Id | MGI:5906120 | Doi | 10.1189/jlb.4HI1214-594R |
| Citation | Cook KD, et al. (2015) NK cells inhibit humoral immunity by reducing the abundance of CD4+ T follicular helper cells during a chronic virus infection. J Leukoc Biol 98(2):153-62 |
| abstractText | There is a need to understand better how to improve B cell responses and immunity to persisting virus infections, which often cause debilitating illness or death. People with chronic virus infection show evidence of improved virus control when there is a strong neutralizing antibody response, and conversely, B cell dysfunction is associated with higher viral loads. We showed previously that NK cells inhibit CD4(+) and CD8(+) T cell responses to disseminating LCMV infection and that depletion of NK cells attenuates chronic infection. Here, we examined the effect of NK cell depletion on B cell responses to LCMV infection in mice. Whereas mice infected acutely generated a peak level of antibody soon after the infection was resolved, mice infected chronically showed a continued increase in antibody levels that exceeded those after acute infection. We found that early NK cell depletion rapidly increased virus-specific antibody levels to chronic infection, and this effect depended on CD4(+) T cells and was associated with elevated numbers of CXCR5(+)CD4(+) TFH cells. However, the NK cell-depleted mice controlled the infection and by 1 mo pi, had lower TFH cell numbers and antibody levels compared with mice with sustained infection. Finally, we show that NK cell depletion improved antiviral CD8(+) T cell responses only when B cells and virus-specific antibody were present. Our data indicate that NK cells diminish immunity to chronic infection, in part, by suppressing TFH cell and antibody responses. |
