Abstract
Neuronal failure leading to dementia in neurodegenerative diseases is evidenced in vivo by functional and structural changes in the brain such as reductions of glucose consumption and volume of grey matter. The earliest phase of cognitive decline and presymptomatic stages of these diseases are heralded by specific patterns of hypometabolism, even in the absence of atrophy, which are currently considered as diagnostic biomarkers. Atrophy is less consistently found as an initial marker of these diseases and is invariably present in moderate to severe stages with a disease-related topography. The relationship between these two markers is not uniform, but in the two diseases in which they have been directly compared, Alzheimer’s and Parkinson’s disease, altered hypometabolism precedes and exceeds atrophy in most regions. This suggests a two-step degenerative process. In contrast to these findings, the hippocampus skips this pattern and is more structurally than functionally affected, thereby suggesting a different pathological mechanism in this particular area. More studies are needed to disentangle the mechanisms underlying both markers and their relationship in neurodegenerative diseases.
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Acknowledgments
This work was supported by CIBERNED, Health Research Institute Carlos III grant PI081539, Basque Country Government grant 2011111074 (to M.C. R-O), Basque Country fellowships (to H. J-U. and M. D-A.), and Fundación Jesús de Gangoiti Barrera fellowship (to M. D-A.).
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Belen Gago, Pedro Clavero, Manuel Delgado-Alvarado, David Garcia-Garcia, and Haritz Jimenez-Urbieta declare that they have no conflict of interest.
María C. Rodriguez-Oroz reports non-financial support from UCB, non-financial support from Lundbeck, non-financial support from Boston Scientific, personal fees and non-financial support from Abbvie, grants from CIBERNED, grants from the Government of Basque Country and Guipuzcoa, grants from Spanish Health Institute, and grants from Era-net.
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Rodriguez-Oroz, M.C., Gago, B., Clavero, P. et al. The Relationship Between Atrophy and Hypometabolism: Is It Regionally Dependent in Dementias?. Curr Neurol Neurosci Rep 15, 44 (2015). https://doi.org/10.1007/s11910-015-0562-0
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DOI: https://doi.org/10.1007/s11910-015-0562-0