Cited by 202Iron Metabolism and DisordersRNA Research and SplicingNeurological diseases and metabolism

Alternative RNA Splicing Generates a Glycosylphosphatidylinositol-anchored Form of Ceruloplasmin in Mammalian Brain

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Patel, Bharatkumar N., Dunn, Robert J., David, Samuel·2000·Journal of Biological Chemistry

Abstract

Ceruloplasmin is a copper-containing ferroxidase that is essential for normal iron homeostasis. Whereas ceruloplasmin in plasma is produced and secreted by hepatocytes, in the brain a glycosylphosphatidylinositol (GPI)-anchored form of ceruloplasmin is expressed on the surface of astrocytes. By using a cDNA cloning approach, we have now determined that the GPI-anchored form of ceruloplasmin is generated by alternative RNA splicing. The splicing occurs downstream of exon 18 and replaces the C-terminal 5 amino acids of the secreted form with an alternative 30 amino acids that signal GPI anchor addition. RNase protection analysis demonstrates that the GPI-anchored form is the major form in the brain, whereas the secreted form predominates in the liver. Individuals with aceruloplasminemia, a hereditary deficiency of ceruloplasmin, have severe iron deposition in a number of organs, including the brain where it results in neurodegeneration. Therefore, this novel GPI-anchored form of ceruloplasmin is likely to play an important role in iron metabolism in the central nervous system.

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  1. Harris, Z., Takahashi, Y., Miyajima, H., Serizawa, M., MacGillivray, R., and Gitlin, J. (1995) Proc. Natl. Acad. Sci. U. S. A. 92, 2539 -2543
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Authors
Patel, B. N., Dunn, R. J., & David, S.
Affiliations
Montreal General Hospital (CA)
Corresponding author
David, Samuel
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2000-02
Volume
275
Issue
6
Pages
4305-4310
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2057172958
Cited by
202
References
37
Citations by year
2026: 2 · 2025: 5 · 2024: 3 · 2023: 4 · 2022: 5 · 2021: 7 · 2020: 5 · 2019: 11 · 2018: 9 · 2017: 6 · 2016: 6 · 2015: 8 · 2014: 10 · 2013: 8 · 2012: 4
FWCI
5.97
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
Medical Research Council
Topics
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Neuroscience › Neurology › Neurological diseases and metabolism
Keywords
ceruloplasmin, alternative splicing, glycosylphosphatidylinositol anchoring, brain, astrocytes, aceruloplasminemia, iron homeostasis, iron accumulation, neurodegeneration, liver
MeSH terms
Amino Acid Sequence, Animals, Brain, Cell Line, Ceruloplasmin, Cloning, Molecular, Humans, Immunohistochemistry, Iron, Liver, Membrane Proteins, Molecular Sequence Data, Type C Phospholipases, Ribonucleases, RNA, Messenger, Transfection, Gene Expression, Sequence Alignment, Glycosylphosphatidylinositols, Alternative Splicing, Phosphatidylinositol Diacylglycerol-Lyase

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