Abstract:
:Prior work shows that an attenuated West Nile virus (WNV), the nonstructural (NS)4B-P38G mutant infection in mice induced strong immune responses and protected host from subsequent lethal wild-type WNV infection. Here, we investigated NS4B-P38G mutant infection in myeloid differentiation factor 88-deficient (MyD88(-/-)) and Toll-like receptor 7-deficient (TLR7(-/-)) mice and found they had enhanced susceptibility compared to wild-type mice. Both groups had lower WNV-specific IgM response and reduced effector T cell functions. Dendritic cells (DCs) also exhibited a reduced maturation and impaired antigen-presenting functions compared to wild-type DCs. Moreover, infection with NS4B-P38G mutant in TLR7(-/-) and MyD88(-/-) mice provided full and partial protection respectively from subsequent challenge with lethal wild-type WNV. There were reduced T cell responses in MyD88(-/-) and interleukin-1 receptor deficient (IL-1R(-/-)) mice during secondary challenge with wild-type WNV. In contrast, TLR7(-/-) mice displayed normal T cell functions. Collectively, these results suggest that TLR7-dependent MyD88 signaling is required for T cell priming during NS4B-P38G mutant infection, whereas the TLR7-independent MyD88 signaling pathways are involved in memory T cell development, which may contribute to host protection during secondary challenge with wild-type WNV.
journal_name
Vaccinejournal_title
Vaccineauthors
Xie G,Welte T,Wang J,Whiteman MC,Wicker JA,Saxena V,Cong Y,Barrett AD,Wang Tdoi
10.1016/j.vaccine.2013.06.093subject
Has Abstractpub_date
2013-08-28 00:00:00pages
4143-51issue
38eissn
0264-410Xissn
1873-2518pii
S0264-410X(13)00903-1journal_volume
31pub_type
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