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논문 기본 정보

자료유형
학술저널
저자정보
HoChung Jang (Korea Brain Research Institute) Jung Hwa Ryu (Korea Brain Research Institute) 신경민 (Korea Brain Research Institute) Na-young Seo (Korea Brain Research Institute) 김규현 (한국뇌연구원) 허양훈 (한국기초과학지원연구원) Ae Nim Pae (Korea Institute of Science and Technology) 이계주 (대구경북과학기술원부설한국뇌연구원)
저널정보
한국뇌신경과학회 Experimental Neurobiology Experimental Neurobiology Vol.28 No.3
발행연도
2019.1
수록면
404 - 413 (10page)

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Cognitive impairments and motor dysfunction are commonly observed behavioral phenotypes in genetic animal models of neurodegenerative diseases. JNPL3 transgenic mice expressing human P301L-mutant tau display motor disturbances with age- and gene dose-dependent development of neurofibrillary tangles, suggesting that tau pathology causes neurodegeneration associated with motor behavioral abnormalities. Although gait ignition failure (GIF), a syndrome marked by difficulty in initiating locomotion, has been described in patients with certain forms of tauopathies, transgenic mouse models mirroring human GIF syndrome have yet to be reported. Using the open field and balance beam tests, here we discovered that JNPL3 homozygous mice exhibit a marked delay of movement initiation. The elevated plus maze excluded the possibility that hesitation to start in JNPL3 mice was caused by enhanced levels of anxiety. Considering the normal gait ignition in rTg4510 mice expressing the same mutant tau in the forebrain, GIF in JNPL3 mice seems to arise from abnormal tau deposition in the hindbrain areas involved in locomotor initiation. Accordingly, immunohistochemistry revealed highly phosphorylated paired helical filament tau in JNPL3 brainstem areas associated with gait initiation. Together, these findings demonstrate a novel behavioral phenotype of impaired gait initiation in JNPL3 mice and underscore the value of this mouse line as a tool to study the neural mechanisms and potential treatments for human GIF syndrome.

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