Human Molecular Genetics, Vol 8, 907-913, Copyright © 1999 by Oxford University Press
A Netik, S Forss-Petter, A Holzinger, B Molzer, G Unterrainer and J Berger
Inherited defects in the peroxisomal ATP-binding cassette (ABC) transporter
adrenoleukodystrophy protein (ALDP) lead to the lethal peroxisomal disorder
X-linked adrenoleukodystrophy (X-ALD), for which no efficient treatment has
been established so far. Three other peroxisomal ABC transporters currently
are known: adrenoleukodystrophy- related protein (ALDRP), 70 kDa
peroxisomal membrane protein (PMP70) and PMP70- related protein. By using
transient and stable overexpression of human cDNAs encoding ALDP and its
closest relative ALDRP, we could restore the impaired peroxisomal
beta-oxidation in fibroblasts of X-ALD patients. The pathognomonic
accumulation of very long chain fatty acids could also be prevented by
overexpression of ALDRP in immortalized X-ALD cells. Immunofluorescence
analysis demonstrated that the functional replacement of ALDP by ALDRP was
not due to stabilization of the mutated ALDP itself. Moreover, we were able
to restore the peroxisomal beta-oxidation defect in the liver of ALDP-
deficient mice by stimulation of ALDRP and PMP70 gene expression through a
dietary treatment with the peroxisome proliferator fenofibrate. These
results suggest that a correction of the biochemical defect in X-ALD could
be possible by drug-induced overexpression or ectopic expression of ALDRP.
ARTICLES
Adrenoleukodystrophy-related protein can compensate functionally for adrenoleukodystrophy protein deficiency (X-ALD): implications for therapy
Institute of Neurology, University of Vienna, Schwarzspanierstrasse 17, A-1090 Vienna, Austria.
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