Abstract:
PURPOSE OF REVIEW:Natural killer (NK) cells promote antiviral immunity by producing proinflammatory cytokines and by lysing infected cells. In addition, NK cells can modulate dendritic cell functions. NK-dendritic cell crosstalk results in activation of both cell types, with dendritic cells promoting NK-cell activity and NK cells inducing further maturation of dendritic cells. Here we review the recent evidence suggesting that NK-dendritic cell crosstalk is disrupted during HIV-1 infection and we discuss the consequences on HIV persistence in dendritic cells. RECENT FINDINGS:NK cell-mediated dendritic cell editing is compromised during HIV-1 infection, and NK cells from viremic individuals show a decreased ability to kill immature dendritic cells. The defect is associated with impaired NKp30 function. Moreover, the resistance of HIV-1-infected dendritic cells to NK-mediated lysis is associated with the upregulation of apoptosis inhibitors, thus protecting infected dendritic cells from TRAIL-dependent apoptosis. These inhibitors are upregulated by the high-mobility group box 1 protein (HMGB1), an alarmin produced at NK-dendritic cell synapse that is essential for NK-dependent dendritic cell maturation, but also promotes viral replication in infected dendritic cells. SUMMARY:HIV-1-induced impairment of NK-dendritic cell crosstalk may significantly alter both innate and adaptive immunity. It may also contribute to HIV persistence in dendritic cells through an HMGB1-dependent mechanism.
journal_name
Curr Opin HIV AIDSjournal_title
Current opinion in HIV and AIDSauthors
Gougeon ML,Bras Mdoi
10.1097/COH.0b013e328349b089subject
Has Abstractpub_date
2011-09-01 00:00:00pages
364-72issue
5eissn
1746-630Xissn
1746-6318pii
01222929-201109000-00005journal_volume
6pub_type
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