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Decreased neural stem cell proliferation and olfaction in mouse models of Niemann–Pick C1 disease and the response to hydroxypropyl-β-cyclodextrin

  • Human Genetics • Original Paper
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Abstract

The Npc1nih/nih-null model and the Npc1nmf164/nmf164 hypomorph models of Niemann–Pick C1 (NPC1) disease show defects in olfaction. We have tested the effects of the life-prolonging treatment hydroxypropyl-beta-cyclodextrin (HPBCD) on olfaction and neural stem cell numbers when delivered either systemically or by nasal inhalation. Using the paradigm of finding a hidden cube of food after overnight food deprivation, Npc1nih/nih homozygous mice showed a highly significant delay in finding the food compared with wild-type mice. Npc1nmf164/nmf164 homozygous mice showed an early loss of olfaction which was mildly corrected by somatic delivery of HPBCD which also increased the number of neural stem cells in the mutant but did not change the number in wild-type mice. In contrast, nasal delivery of this drug, at 1/5 the dosage used for somatic delivery, to Npc1nmf164/nmf164 mutant mice delayed loss of olfaction but the control of nasal delivered saline did so as well. The nasal delivery of HPBCD to wild-type mice caused loss of olfaction but nasal delivery of saline did not. Neural stem cell counts were not improved by nasal therapy with HPBCD. We credit the delay in olfaction found with the treatment, a delay which was also found for time of death, to a large amount of stimulation the mice received with handling during the nasal delivery.

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Abbreviations

HPBCD:

Hydroxypropyl-beta-cyclodextrins

NPC:

Niemann–Pick C

OB:

Olfactory bulb

SVZ:

Subventricular zone

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Acknowledgments

RPE acknowledges the support of the University Roma, La Sapienza for visiting research professorships.

Funding

The financial supports of Telethon Foundation - Italy (grant no. GGP13183 to M.T.F.) and the Ateneo La Sapienza (RM11615501ED6577) are gratefully acknowledged.

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Authors and Affiliations

Authors

Contributions

J. D. and G. P. performed BrdU labelling, immunohistochemistry, and treatments; G. P. and P. C. performed olfactory testing; S. C. performed HPBCD treatments and supervised experiments; M. T. F. and R. P. E. conceived the study and wrote the manuscript.

Corresponding author

Correspondence to Robert P. Erickson.

Ethics declarations

Experimental protocols and related procedures were approved by the University of Arizona IACUC Institutional Animal Care Utilization Committee and Italian Ministry of Public Health. All experiments were conducted according to the Italia law DL 26/2014 on the protection of animals used for scientific purpose.

Conflict of interest

The authors declare that they have no competing interests.

Additional information

Communicated by: Michal Witt

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Dragotto, J., Palladino, G., Canterini, S. et al. Decreased neural stem cell proliferation and olfaction in mouse models of Niemann–Pick C1 disease and the response to hydroxypropyl-β-cyclodextrin. J Appl Genetics 60, 357–365 (2019). https://doi.org/10.1007/s13353-019-00517-8

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  • DOI: https://doi.org/10.1007/s13353-019-00517-8

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