Abstract
Background
Childhood cerebral adrenoleukodystrophy (CCALD), a progressive demyelinating disease affecting school-aged boys, causes death within a few years. Oxidative stress is an important contributing factor. N-acetylcysteine (NAC; 280 mg/kg/day) added as adjunctive therapy to reduced-intensity hematopoietic cell transplantation (HCT) improves survival in advanced cases. However, the mechanisms underlying the benefits of NAC are unclear.
Objective
The aim of this study was to understand the mechanism of action of NAC in the setting of HCT in CCALD.
Methods
Immunoassays were carried out to determine changes in heme oxygenase-1 (HO-1) and ferritin expression in plasma samples collected from boys with CCALD at three different timepoints during the course of transplantation. In addition, the induction of HO-1 was also confirmed in normal fibroblasts following incubation with 10–100 µmol/L NAC for 4 h.
Results
Following NAC therapy we observed an increase in expression of the antioxidants HO-1 (~4-fold) and its effector ferritin (~160-fold) in patient samples as compared with baseline. We also observed that NAC exposure significantly increased HO-1 expression in fibroblasts.
Conclusion
Our data suggest that HO-1 is a possible target protein of NAC and a mediator of its cytoprotective effects in these patients.



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Author contributions
Designed the experiments: RVK, JZ, LB, HS, PJO, JC. Performed the experiments: JZ, RVK, LB. Analyzed the data: JZ, RVK, LB, HS. Contributed essential reagents/tools: PJO, JC, HS. Wrote the paper: RVK, JZ, LB, HS, PJO, JC.
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The study was funded by a University of Minnesota Academic Health Center Faculty Development Grant to JC and PJO.
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RVK, JZ, LB, HS, PJO, and JC declare that they have no conflicts of interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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R. V. Kartha and J. Zhou contributed equally to this work.
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Kartha, R.V., Zhou, J., Basso, L. et al. Mechanisms of Antioxidant Induction with High-Dose N-Acetylcysteine in Childhood Cerebral Adrenoleukodystrophy. CNS Drugs 29, 1041–1047 (2015). https://doi.org/10.1007/s40263-015-0300-9
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DOI: https://doi.org/10.1007/s40263-015-0300-9