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Orphanet Journal of Rare Diseases
Published in: Orphanet Journal of Rare Diseases 1/2015

Open Access 01-12-2015 | Research

Visual evoked potentials of Niemann-Pick type C1 mice reveal an impairment of the visual pathway that is rescued by 2-hydroxypropyl-ß-cyclodextrin

Authors: Giampiero Palladino, Stefano Loizzo, Andrea Fortuna, Sonia Canterini, Fioretta Palombi, Robert P. Erickson, Franco Mangia, Maria Teresa Fiorenza

Published in: Orphanet Journal of Rare Diseases | Issue 1/2015

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Abstract

Background

The lysosomal storage disorder, Niemann Pick type C1 (NPC1), presents a variable phenotype including neurovisceral and neurological symptoms. 2-Hydroxypropyl-ß-cyclodextrin (HPßCD)-based therapies are presently the most promising route of intervention. While severe cerebellar dysfunction remains the main disabling feature of NPC1, sensory functions including auditory and olfactory ones are also affected. Morphological and functional anomalies of Npc1 −/− mouse retina have also been observed, although the functional integrity of the visual pathway from retina to visual cortex is still unsettled. We have addressed this issue by characterizing the visual evoked potential (VEP) response of Npc1 −/− mice and determining if/how HPßCD administration influences the VEPs of both Npc1 −/− and Npc1 +/+ mice.

Methods

VEP elicited by a brief visual stimulus were recorded from the scalp overlying the visual cortex of adult (PN, postnatal days 60, 75, 85 and 100) Npc1 +/+ and Npc1 −/− mice that had received repeated injections of either HPßCD or plain vehicle. The first injection was given at PN4 and was followed by a second one at PN7 and thereafter by weekly injections up to PN49. Cholesterol accumulation and myelin loss were finally assessed by filipin staining and myelin basic protein immunohistochemistry, respectively.

Results and discussion

We have found that the transmission of visual signals from retina to visual cortex is negatively influenced by the loss of Npc1 function. In fact, the VEP response of Npc1 −/− mice displayed a highly significant increase in the latency compared to that of Npc1 +/+ mice. HPßCD administration fully rescued this defect and counteracted the cholesterol accumulation in retinal ganglion cells and dorsal lateral geniculate nucleus neurons, as well as the myelin loss in optic nerve fibers and axons projecting to the visual cortex observed in of Npc1 −/− mice. By contrast, HPßCD administration had no effect on the VEP response of Npc1 +/+ mice, further strengthening the treatment efficacy.

Conclusions

This study pinpoints the analysis of VEP response as a potentially accurate and non-invasive approach to assess neural activity and visual information processing in NPC1 patients, as well as for monitoring the progression of the disease and assessing the efficacy of potential therapies.
Appendix
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Metadata
Title
Visual evoked potentials of Niemann-Pick type C1 mice reveal an impairment of the visual pathway that is rescued by 2-hydroxypropyl-ß-cyclodextrin
Authors
Giampiero Palladino
Stefano Loizzo
Andrea Fortuna
Sonia Canterini
Fioretta Palombi
Robert P. Erickson
Franco Mangia
Maria Teresa Fiorenza
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Orphanet Journal of Rare Diseases / Issue 1/2015
Electronic ISSN: 1750-1172
DOI
https://doi.org/10.1186/s13023-015-0348-0

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