Human Molecular Genetics, Vol 5, 1989-1996, Copyright © 1996 by Oxford University Press
LW Klomp and JD Gitlin
Aceruloplasminemia is an autosomal recessive disorder of iron metabolism
characterized by progressive neurodegeneration of the retina and basal
ganglia in association with inherited mutations of the ceruloplasmin gene.
To begin to elucidate the pathogenesis of this disease, ceruloplasmin gene
expression was examined in human brain and retinal tissue. RNA blot
analysis and RNAse protection studies demonstrate ceruloplasmin-specific
transcripts in multiple regions of the human brain, and biosynthetic
studies reveal ceruloplasmin synthesis and secretion in these same regions.
Consistent with these observations, in situ hybridization of central
nervous system tissue utilizing ceruloplasmin cRNA probes reveals abundant
ceruloplasmin gene expression in specific populations of glial cells
associated with the brain microvasculature, surrounding dopaminergic
melanized neurons in the substantia nigra and within the inner nuclear
layer of the retina. Taken in the context of the clinical and pathological
features observed in patients with aceruloplasminemia, these data reveal
that glial cell- specific ceruloplasmin gene expression is essential for
iron homeostasis and neuronal survival in the human central nervous system.
ARTICLES
Expression of the ceruloplasmin gene in the human retina and brain: implications for a pathogenic model in aceruloplasminemia
Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, St Louis Children's Hospital, MO 63110, USA.
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