Abstract：
:Central nervous system (CNS) infection with herpes simplex virus (HSV)-1 triggers neuroinflammatory responses leading to peripheral immune cell infiltration into the brain. Previous in vitro studies from our laboratory, using primary human brain cells, implicated microglia as the cellular source of infection-induced chemokines, such as CXC ligand 10 (CXCL10) and CC ligand 2 (CCL2). Here, we evaluated the role of microglial cells in HSV-induced neuroimmune responses using an in vivo murine model of herpes encephalitis. Data obtained during this study demonstrated robust levels of CXCL10, CCL2 and CXCL9 detectable in the brains of infected BALB/c mice between 5 and 8 days post-infection (p.i.). Microglial cells were identified as a source of this HSV-induced chemokine production. Additional experiments established that induction of these immune mediators preceded the presence of CD3, CD4, CD8, and CD45 mRNA in the brain, and immunohistochemical analysis confirmed the presence of infiltrating CD3(+) cells. Further analysis suggested that microglia-derived chemokines drive peripheral immune cell chemotaxis, as antibodies to CXCL10 and CCL2 blocked the migration of murine splenocytes toward HSV-infected microglia by approximately 59.3+/-4.1% and 17.5+/-1.4%, respectively. Taken together, these results demonstrate that a vigorous microglia-driven cascade of pro-inflammatory immune responses is not sufficient to protect susceptible mice from HSV-1 brain infection.
journal_name
Virus Resjournal_title
Virus researchauthors
Marques CP,Hu S,Sheng W,Lokensgard JRdoi
10.1016/j.virusres.2006.03.009subject
Has Abstractpub_date
2006-10-01 00:00:00pages
1-10issue
1eissn
0168-1702issn
1872-7492pii
S0168-1702(06)00096-7journal_volume
121pub_type
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