Human neonatal naive CD4+ T cells have enhanced activation-dependent signaling regulated by the microRNA miR-181a.
Human neonatal naive CD4+ T cells have enhanced activation-dependent signaling regulated by the microRNA miR-181a.
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DOI：
10.4049/jimmunol.1202534
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发表时间：
2013-03-15
期刊：
影响因子：
--
通讯作者：
Lewis DB
中科院分区：
文献类型：
--
作者：
Palin AC;Ramachandran V;Acharya S;Lewis DB
Human neonates have reduced and delayed CD4+ T-cell immunity to certain pathogens compared to older children and adults, but the mechanisms for these developmental differences in immune function remain poorly understood. We investigated the hypothesis that impaired human neonatal CD4+ T-cell immunity was due to reduced signaling by naive CD4+ T cells following engagement of the αβ-TCR/CD3 complex and CD28. Surprisingly, calcium flux following engagement of CD3 was significantly higher in neonatal naive CD4+ T cells from umbilical cord blood compared to naive CD4+ T cells from adult peripheral blood. Enhanced calcium flux was also observed in adult CD4+ recent thymic emigrants. Neonatal naive CD4+ T cells also had higher activation-induced Erk phosphorylation. The microRNA miR-181a, which enhances activation-induced calcium flux in murine thymocytes, was expressed at significantly higher levels in cord blood naive CD4+ T cells compared to adult cells. Overexpression of miR-181a in adult naive CD4+ T cells increased activation-induced calcium flux, implying that the increased miR-181a levels of cord blood naive CD4+ T cells contributed to their enhanced signaling. In contrast, AP-1-dependent transcription, which is downstream of Erk and required for full T-cell activation, was decreased in cord blood naive CD4+ T cells compared to adult cells. Thus, cord blood naive CD4+ T cells have enhanced activation-dependent calcium flux, indicative of the retention of a thymocyte-like phenotype. Enhanced calcium signaling and Erk phosphorylation are decoupled from downstream AP-1-dependent transcription, which is reduced and likely contributes to limitations of human fetal and neonatal CD4+ T-cell immunity.
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DOI：
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发表时间：
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