Cited by 4Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsProtease and Inhibitor Mechanisms

Monocytic elastase-mediated apolipoprotein-E degradation: Potential involvement of microglial elastase-like proteases in apolipoprotein-E proteolysis in brains with Alzheimers disease

Suenaga, Midori, Furuta, Akiko, Wakabayashi, Koichi, Saibara, Toshiji, Matsunaga, Yoichi·2015·Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics

Abstract

Impaired clearance of soluble Aβ (amyloid-β) promotes Aβ aggregation in brains with Alzheimer's disease (AD), while apolipoprotein-E (ApoE) in microglia mediates Aβ clearance. We studied the protease responsible for ApoE(4) degradation in human peripheral monocyte extracts, which are from the same lineage as microglia. We detected the hydrolytic activity for ApoE(4) in high-salt extracts with 2 M NaCl and found that the activity was inhibited by a serine protease inhibitor and an elastase-specific inhibitor, but not by other protease inhibitors. The extracts exhibited higher activity for the elastase substrate, and we followed the activity with ion-exchange and gel-filtration chromatography. Through silver staining, we partially purified a protein of 28 kDa, which was clarified as elastase by liquid chromatography-tandem mass spectrometry. These observations suggest that elastase is the key protease for ApoE(4) degradation. We also detected ApoE(4) hydrolytic activity in high-salt extracts in mouse microglial (BV-2) cell lysates, and showed that the ApoE(4) fragments by the BV-2 extracts differed from the fragments by the monocyte extracts. Though the ApoE(4) degradation by the extracts was not inhibited with elastase-specific inhibitors, it was inhibited by an elastase-specific monoclonal antibody, suggesting that elastase-like proteases in microglia differ from those of monocytes. Immunohistochemistry revealed that both elastase and ApoE were expressed in the senile plaques…

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Crossref · 10.1016/j.bbapap.2015.04.028

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Authors
Suenaga, M., Furuta, A., Wakabayashi, K., Saibara, T., & Matsunaga, Y.
Affiliations
  • Tokushima Bunri University (JP)
  • Juntendo University (JP)
  • Hirosaki University (JP)
  • Kōchi University (JP)
Corresponding author
Matsunaga, Yoichi
Venue
Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics
Publisher
Elsevier BV
Published
2015-08
Volume
1854
Issue
8
Pages
1010-1018
ISSN
1570-9639 (ISSN-L)
OpenAlex
W425302475
Cited by
4
References
44
Citations by year
2023: 1 · 2017: 2 · 2016: 1
FWCI
0.74
Type
journal article
Language
en
Open access
closed
Locations
  • Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics (publishedVersion)
  • PubMed (publishedVersion)
Funders
Ministry of Education, Science, Sport, and Culture of Japan (23590697)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Protease and Inhibitor Mechanisms
Keywords
apolipoprotein E, elastase, microglia, monocytes, Alzheimer's disease, amyloid-beta clearance, proteolysis, amyloid plaques, BV-2 cells, serine protease inhibitors
MeSH terms
Aged, Alzheimer Disease, Brain, Cell Line, Female, Gene Expression Regulation, Humans, Male, Monocytes, Microglia, Leukocyte Elastase, Apolipoprotein E4, Proteolysis

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