Cited by 327Neurological diseases and metabolismTrace Elements in HealthIron Metabolism and Disorders

A Novel Glycosylphosphatidylinositol-anchored Form of Ceruloplasmin Is Expressed by Mammalian Astrocytes

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Patel, Bharatkumar N., David, Samuel·1997·Journal of Biological Chemistry

Abstract

Ceruloplasmin is a copper-binding protein, which is the major ferroxidase in plasma of hepatic origin. We now provide evidence for a novel membrane-bound form of ceruloplasmin expressed by astrocytes in the mammalian central nervous system. Using a monoclonal antibody (1A1), we show that the cell surface antigen recognized by this antibody is ceruloplasmin and that it is directly anchored to the cell surface via a glycosylphosphatidylinositol (GPI) anchor. Our peptide mapping and other immunochemical studies indicate that, except for the GPI anchor, the membrane-bound and secreted plasma forms are similar. We also show that the membrane-bound form of ceruloplasmin has oxidase activity. These studies therefore suggest that the GPI-anchored form of ceruloplasmin may play a role similar to the secreted form in oxidizing ferrous iron. The GPI-anchored form of ceruloplasmin expressed by astrocytes is likely to be the major form of this molecule in the central nervous system because serum ceruloplasmin does not cross the blood-brain barrier. Lack of this form of ceruloplasmin in the central nervous system could lead to the generation of highly toxic free radicals, which can cause neuronal degeneration as seen in aceruloplasminemia and other neurodegenerative diseases such as Parkinson's and Alzheimer's disease.

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Crossref · 10.1074/jbc.272.32.20185

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Authors
Patel, B. N., & David, S.
Affiliations
Montreal General Hospital (CA)
Corresponding author
David, Samuel
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1997-08
Volume
272
Issue
32
Pages
20185-20190
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2036545911
Cited by
327
References
61
Citations by year
2026: 4 · 2025: 6 · 2024: 5 · 2023: 7 · 2022: 11 · 2021: 13 · 2020: 9 · 2019: 12 · 2018: 15 · 2017: 8 · 2016: 8 · 2015: 10 · 2014: 16 · 2013: 11 · 2012: 11
FWCI
6.84
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Neurology › Neurological diseases and metabolism
  • Health Sciences › Nursing › Nutrition and Dietetics › Trace Elements in Health
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
Keywords
ceruloplasmin, glycosylphosphatidylinositol anchor, astrocytes, central nervous system, ferroxidase activity, ferrous iron oxidation, copper-binding proteins, aceruloplasminemia, neurodegenerative diseases, blood-brain barrier, free radicals
MeSH terms
Animals, Antibodies, Monoclonal, Astrocytes, Cells, Cultured, Ceruloplasmin, Immunoenzyme Techniques, Peptide Mapping, Tumor Cells, Cultured, Glycosylphosphatidylinositols, Rats

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