CD8+ T lymphocytes control murine cytomegalovirus replication in the central nervous system of newborn animals.

CD8+ T lymphocytes control murine cytomegalovirus replication in the central nervous system of newborn animals.
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DOI:
10.4049/jimmunol.181.3.2111
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发表时间:
2008-08-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Britt WJ
Britt WJ
中科院分区:
其他
文献类型:
--
作者:
Bantug GR;Cekinovic D;Bradford R;Koontz T;Jonjic S;Britt WJ

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人巨细胞病毒(HCMV)感染新生儿中枢神经系统会导致长期的神经系统后遗症。为了明确胎儿巨细胞病毒中枢神经系统感染的发病机制,我们研究了小鼠巨细胞病毒(MCMV)感染新生Balb/c小鼠的中枢神经系统病毒清除机制。病毒滴度在出生后10-14天在中枢神经系统达到高峰,在出生后第21天检测不到传染性病毒。与病毒清除一致的是CD8+T细胞重新进入中枢神经系统。在感染MCMV的动物中,CD8+T细胞耗尽导致出生后15天死亡,肝、脾和中枢的病毒载量增加,表明这些细胞在控制新生脑组织中MCMV复制方面发挥了重要作用。脑单个核细胞检测显示CD8+T细胞高表达CD69、CD44和CD49d。IE116 8特异性T细胞聚集在中枢神经系统,在多肽刺激下产生干扰素-γ和肿瘤坏死因子-α,但不产生IL-2。此外,过继转移脑单个核细胞可降低免疫耗竭的MCMV感染同基因小鼠的病毒载量。转移后CD8+细胞群的耗尽消除了对病毒复制的控制。综上所述,这些结果表明,在新生感染MCMV的小鼠中,功能成熟的病毒特异性CD8+T细胞被招募到中枢神经系统。
Human cytomegalovirus (HCMV) infection of the neonatal CNS results in long-term neurologic sequelae. To define the pathogenesis of fetal HCMV CNS infections, we investigated mechanisms of virus clearance from the CNS of neonatal Balb/c mice infected with murine CMV (MCMV). Virus titers peaked in the CNS between post-natal (PN) days 10–14 and infectious virus was undetectable by PN day 21. Congruent with virus clearance was the recruitment of CD8+ T-cells into the CNS. Depletion of CD8+ T cells resulted in death by postnatal day 15 in MCMV infected animals and increased viral loads in the liver, spleen and the CNS suggesting an important role for these cells in the control of MCMV replication in the newborn brain. Examination of brain mononuclear cells revealed that CD8+ T-cell infiltrates expressed high levels of CD69, CD44 and CD49d. IE1168 specific CD8+ T-cells accumulated in the CNS and produced IFN-γ and TNF-α but not IL-2 following peptide stimulation. Moreover, adoptive transfer of brain mononuclear cells resulted in decreased virus burden in immunodepleted MCMV infected syngeneic mice. Depletion of the CD8+ cell population following transfer eliminated control of virus replication. In summary, these results show that functionally mature virus specific CD8+ T-cells are recruited to the CNS in mice infected with MCMV as neonates.
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