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Amyloid proteins except for 13 protein―Special reference with α1-antichymotrypsin. Mikio SHOJI 1 1Department of Neurology, Gunma University School of Medicine pp.430-440
Published Date 1990/6/10
DOI https://doi.org/10.11477/mf.1431900043
  • Abstract
  • Look Inside

 α1-antichymotrypsin (ACT) is a glycoprotein with molecular weight of 64 kDa to 69 kDa in serum, liver and brain. ACT is a protein consisted of 433 amino acid residues, produced in liver, secreted to blood circulation, and regulated IL-1/6 and cytokines. ACT is partially produced in the brain. Blood ACT level is elevated in acute inflammation, infection and malignancies. ACT inhibits chymotrypsin like seryl protease, ie., cathepsin G, chymotrypsin, elastase and chymase.

 Immunocytochemistry shows that ACT is present in the neurons, and cortical/subcortical astocytes. All types of senile plaques and some small amyloid deposits are labeled by ACT staining in Alzheimer brains. Subpial amyloid deposits are negative. Almost all the senile plaques including diffuse plaques labeled by ACT staining. Extracellular tangles also contains ACT. Diffuse plaques in Down's syndrome and amyloid angiopathy are stained. However, Kuru plaques and amyloids in systemic amyloidosis are negative. Other serine protease inhibitors and a serine protease are negative in senile plaques. This indicate that ACT is closely related to senile plaque amyloids from early to late stage.


Copyright © 1990, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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