A Novel Glycosylphosphatidylinositol-anchored Form of Ceruloplasmin Is Expressed by Mammalian Astrocytes
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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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Recent evidence has implicated abnormal iron metabolism in the pathogenesis of neurodegeneration.
“Recent evidence has implicated abnormal iron metabolism in the pathogenesis of neurodegeneration (120, 241).”
From Intracellular iron transport and storage: from molecular mechanisms to health implications (2008) · cites this paper as [241]
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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
- hybrid
- doi.org
- Licence
- 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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