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Related Experiment Videos

Kii ALS dementia.

Y Yase1, S Yoshida, T Kihira

  • 1Research Center of Neurological Diseases, Kansai College of Oriental Medicine, Kumatori, Osaka, Japan.

Neuropathology : Official Journal of the Japanese Society of Neuropathology
|June 9, 2001
PubMed
Summary

Environmental factors in Japan

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Area of Science:

  • Neuroscience
  • Epidemiology
  • Environmental Health

Background:

  • Amyotrophic Lateral Sclerosis (ALS) epidemiological surveys in Japan's Kii Peninsula began in the 1960s.
  • Two distinct ALS foci were identified in Kozagawa and Hobara.
  • Kii Peninsula ALS cases exhibited unique clinical (parkinsonism, dementia) and neuropathological (Alzheimer's-like NFTs) features.

Purpose of the Study:

  • To investigate the etiopathogenesis of a unique form of ALS in the Kii Peninsula.
  • To analyze environmental factors in ALS focus areas.
  • To examine patient specimens for potential causative agents.

Main Methods:

  • Long-term epidemiological surveys in Kii Peninsula ALS foci.
  • Clinical and neuropathological examination of ALS patients.
  • Environmental analysis of drinking water and soil in focus areas.

Main Results:

  • Identified unique clinical and neuropathological characteristics in Kii Peninsula ALS.
  • Observed Alzheimer's disease-like neurofibrillary tangles (NFTs) in the cerebral cortex and brainstem nuclei.
  • Hypothesized environmental link involving low calcium/magnesium and excess aluminum/manganese.

Conclusions:

  • Environmental exposure to specific trace elements (low Ca/Mg, high Al/Mn) may contribute to neurodegeneration in Kii Peninsula ALS.
  • This unique ALS form may result from trace element deposition in the central nervous system (CNS).
  • Further research is warranted to confirm the role of environmental factors in ALS pathogenesis.

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