Interleukin 18 activates MAPKs and STAT3 but not NF-κB in hippocampal HT-22 cells.

Interleukin 18 activates MAPKs and STAT3 but not NF-κB in hippocampal HT-22 cells.
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DOI:
10.1016/j.bbi.2014.02.015
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发表时间:
2014-08
期刊:
Brain, behavior, and immunity
影响因子:
--
通讯作者:
Tascedda F
Tascedda F
中科院分区:
其他
文献类型:
--
作者:
Alboni S;Montanari C;Benatti C;Sanchez-Alavez M;Rigillo G;Blom JM;Brunello N;Conti B;Pariante MC;Tascedda F

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白细胞介素 (IL)-18 是一种细胞因子,之前已被证明参与神经炎症过程。由于 IL-18 受体复合物的成分在整个大脑的神经元中表达,因此 IL-18 也被认为直接影响神经元功能。在这里,我们通过测量 IL-18 对非神经元细胞中先前显示受该细胞因子调节的三种途径的影响,在小鼠海马神经元上测试了这一假设:MAPK 途径、p38 和 ERK1/2 MAPK、STAT3 和 NF-κB。使用永生化海马神经元系 HT-22 进行体外实验,或在 i.c.v. 后进行体内实验。注射重组小鼠IL-18。我们发现 IL-18 不会激活 HT-22 细胞中的 NF-κB,但它会诱导 MAPK 通路的快速(15 分钟内)激活。此外,我们证明IL-18处理在暴露3​​0-60分钟后增强了HT-22细胞核中的P-STAT3 (Tyr705)/STAT3比率。静脉注射后一小时,在整个海马体中观察到 P-STAT3 (Tyr705)/STAT3 比率有类似的增加。注射。这些数据表明IL-18可以直接作用于影响STAT3通路的神经元细胞;因此,可能调节海马内特定基因的表达。这种效应可能有助于解释 IL-18 诱导的对海马系统内突触可塑性和功能的一些影响。
Interleukin (IL)- 18 is a cytokine previously demonstrated to participate in neuroinflammatory processes. Since the components of the IL-18 receptor complex are expressed in neurons throughout the brain, IL-18 is also believed to directly influence neuronal function. Here we tested this hypothesis on mouse hippocampal neurons by measuring the effects of IL-18 on three pathways previously shown to be regulated by this cytokine in non-neuronal cells: the MAPK pathways, p38 and ERK1/2 MAPKs, STAT3 and NF-κB. Experiments were carried out in vitro using the immortalized hippocampal neuronal line HT-22 or in vivo following i.c.v. injection with recombinant mouse IL-18. We showed that IL-18 did not activate NF-κB in HT-22 cells whereas it induced a rapid (within 15 minutes) activation of the MAPK pathways. Moreover, we demonstrated that IL-18 treatment enhanced P-STAT3 (Tyr705)/ STAT3 ratio in the nucleus of HT-22 cells after 30–60 minutes of exposure. A similar increase in P-STAT3 (Tyr705)/ STAT3 ratio was observed in the whole hippocampus one hour after i.c.v. injection. These data demonstrate that IL-18 can act directly on neuronal cells affecting the STAT3 pathway; therefore, possibly regulating the expression of specific genes within the hippocampus. This effect may help to explain some of the IL-18- induced effects on synaptic plasticity and functionality within the hippocampal system.
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