Lower motor neuron involvement in TAR DNA-binding protein of 43 kDa-related frontotemporal lobar degeneration and amyotrophic lateral sclerosis

Yuichi Riku, Hirohisa Watanabe, Mari Yoshida, Shinsui Tatsumi, Maya Mimuro, Yasushi Iwasaki, Masahisa Katsuno, Yohei Iguchi, Michihito Masuda, Jo Senda, Shinsuke Ishigaki, Tsuyoshi Udagawa, Gen Sobue

研究成果: Article査読

22 被引用数 (Scopus)

抄録

IMPORTANCE: TAR DNA-binding protein of 43 kDa (TDP-43) plays a major role in the pathogenesis of frontotemporal lobar degeneration (FTLD) and amyotrophic lateral sclerosis (ALS). Although a pathological continuity between FTLD and ALS has been suggested, the neuropathological changes of the lower motor neuron (LMN) systems have not been assessed in TDP-43-associated FTLD (FTLD-TDP), to our knowledge. OBJECTIVE: To investigate a pathological continuity between FTLD-TDP and ALS by comparing their respective neuropathological changes in the motor neuron system. DESIGN AND SETTING: A retrospective clinical medical record review and a semiquantitative neuropathological evaluation of the cranial motor nerve nuclei and spinal cord were conducted at autopsy. We included 43 patients with sporadic FTLD-TDP, type A, B, or C, from 269 consecutively autopsied patients with TDP-43 proteinopathy. Patients were categorized as having FTLD without ALS, FTLD-ALS (onset of FTLD symptoms/signs preceded those of ALS), or ALS-FTLD (onset of ALS symptoms/signs preceded those of FTLD). MAINOUTCOMESANDMEASURES: Neuronal TDP-43 pathological changes and neuronal loss. RESULTS: Forty-three patients were included in the clinical analysis, and 29 from whom spinal cords were obtained were included in the neuropathological analysis. Survival time was significantly shorter in the FTLD-ALS and ALS-FTLD groups than in the FTLD without ALS group (P <.001). At neuropathological examination, 89% of patients in the FTLD without ALS group showed aggregations of TDP-43 in the spinal motor neurons. The LMN loss was most severe in ALS-FTLD, followed by FTLD-ALS and FTLD without ALS. All the patients with type A or C FTLD-TDP were included in the FTLD without ALS group, and all those with type B pathological changes were in the FTLD-ALS or the ALS-FTLD group. Lower motor neuron loss and TDP-43-positive skeinlike inclusions were observed in all pathological subtypes. CONCLUSIONS AND RELEVANCE: The LMN systems of FTLD-TDP frequently exhibit neuropathological changes corresponding to ALS. Thus, a pathological continuity between FTLD-TDP and ALS is supported at the level of the LMN system.

本文言語English
ページ(範囲)172-179
ページ数8
ジャーナルJAMA Neurology
71
2
DOI
出版ステータスPublished - 02-2014
外部発表はい

All Science Journal Classification (ASJC) codes

  • 臨床神経学

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