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:
影响因子:
--
通讯作者:
Tascedda F
中科院分区:
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
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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