Journal
NEUROPSYCHOPHARMACOLOGY REPORTS
Volume 41, Issue 1, Pages 102-110Publisher
WILEY
DOI: 10.1002/npr2.12162
Keywords
Astrocyte; Hippocampus; IL‐ 17A; Microglia; RORγ t
Categories
Funding
- Brain Mapping by Integrated Neurotechnologies for Disease Studies (Brain/MINDS) from the Japan Agency for Medical Research and Development (AMED) [JP18dm0207047]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [19K06918]
- MEXT Japan [15K19759, 17K16409, 19K08065, 19H05201]
- Takeda Science Foundation
- Naito Foundation
- NIBB Collaborative Research Program [19-509, 16H06276]
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Our study found that continuous increase of IL-17A resulting from ROR gamma t overexpression led to decreased microglia activity in the dentate gyrus of the brain, but had only a subtle effect on murine hippocampal functions. The expression levels of synaptic proteins and the novel object location test results showed no significant differences between ROR gamma t Tg and wild-type mice.
Objective T helper 17 (Th17) cells are a subset of CD4(+) T cells that produce interleukin (IL)-17A. Recent studies showed that an increase in circulating IL-17A causes cognitive dysfunction, although it is unknown how increased systemic IL-17A affects brain function. Using transgenic mice overexpressing ROR gamma t, a transcription factor essential for differentiation of Th17 cells (ROR gamma t Tg mice), we examined changes in the brain caused by chronically increased IL-17A resulting from excessive activation of Th17 cells. Results ROR gamma t Tg mice exhibited elevated Rorc and IL-17A mRNA expression in the colon, as well as a chronic increase in circulating IL-17A. We found that the immunoreactivity of Iba1 and density of microglia were lower in the dentate gyrus of ROR gamma t Tg mice compared with wild-type mice. However, GFAP(+) astrocytes were unchanged in the hippocampi of ROR gamma t Tg mice. Levels of synaptic proteins were not significantly different between ROR gamma t Tg and wild-type mouse brains. In addition, novel object location test results indicated no difference in preference between these mice. Conclusion Our findings indicate that a continuous increase of IL-17A in response to ROR gamma t overexpression resulted in decreased microglia activity in the dentate gyrus, but had only a subtle effect on murine hippocampal functions.
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