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Differential involvement of hippocampal subfields in Niemann-Pick type C disease: a case–control study

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Abstract

Hippocampal brain regions are strongly implicated in Niemann Pick type C disease (NPC), but little is known regarding distinct subregions of the hippocampal complex and whether these are equally or differentially affected. To address this gap, we compared volumes of five hippocampal subfields between NPC and healthy individuals using MRI. To this end, 9 adult-onset NPC cases and 9 age- and gender-matched controls underwent a 3 T T1-weighted MRI scan. Gray matter volumes of the cornu ammonis (CA1, CA2 and CA3), dentate gyrus (DG), subiculum, entorhinal cortex and hippocampal-amygdalar transition area were calculated by integrating MRI-based image intensities with microscopically defined cytoarchitectonic probabilities. Compared to healthy controls, NPC patients showed smaller volumes of the CA1-3 and DG regions bilaterally, with the greatest difference localized to the left DG (Cohen’s d = 1.993, p = 0.008). No significant associations were shown between hippocampal subfield volumes and key clinical features of NPC, including disease duration, symptom severity and psychosis. The pattern of hippocampal subregional atrophy in NPC differs from those seen in other dementias, which may indicate unique cytoarchitectural vulnerabilities in this earlier-onset disorder. Future MRI studies of hippocampal subfields may clarify its potential as a biomarker of neurodegeneration in NPC.

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Data availability

The generated and analyzed data during this study are available from the corresponding author on reasonable request.

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Funding

The authors declared no specific grant for this research from any funding agency in public, commercial or not-for-profit sectors.

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Contributions

PW was involved in the conception and coordination of the study, as well as interpretation of the data. MW led the conception and coordination of the study. Image pre-processing and statistical analyses were conducted by EL and FK. PW led the manuscript preparation and writing of first draft along with EL, FK and MW. VC, MDB, CP and DV were involved in the conception, design and execution of the study, interpretation of data, review and critique of the draft. All authors approved of the manuscript’s final version.

Corresponding author

Correspondence to Pierre Wibawa.

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Ethical approval

All procedures performed in this study were in accordance with the ethical standards of the Austin Health and Melbourne Health ethics committees (approval number 2012.066), Victoria, Australia, and with the Australian National Statement on Ethical Conduct in Human Research (2007).

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Written informed consent was obtained from all individual participants included in the study.

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None to declare.

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Wibawa, P., Kurth, F., Luders, E. et al. Differential involvement of hippocampal subfields in Niemann-Pick type C disease: a case–control study. Metab Brain Dis 36, 2071–2078 (2021). https://doi.org/10.1007/s11011-021-00782-9

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  • DOI: https://doi.org/10.1007/s11011-021-00782-9

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