Increased dopaminergic cells and protein aggregates in the olfactory bulb of patients with neurodegenerative disorders.

Abstract:

:Olfactory dysfunction is a frequent and early feature of patients with neurodegenerative disorders such as Alzheimer's disease (AD) and Parkinson's disease (PD) and is very uncommon in patients with frontotemporal dementia (FTD). Mechanisms underlying this clinical manifestation are poorly understood but the premature deposition of protein aggregates in the olfactory bulb (OB) of these patients might impair its synaptic organization, thus accounting for the smell deficits. Tau, β-amyloid and alpha-synuclein deposits were studied in 41 human OBs with histological diagnosis of AD (n = 24), PD (n = 6), FTD (n = 11) and compared with the OB of 15 control subjects. Tau pathology was present in the OB of all patients, irrespective of the histological diagnosis, while β-amyloid and alpha-synuclein protein deposit were frequently observed in AD and PD, respectively. Using stereological techniques we found an increased number of dopaminergic periglomerular neurons in the OB of AD, PD and FTD patients when compared with age-matched controls. Moreover, volumetric measurements of OBs showed a significant decrease only in AD patients, while the OB volume was similar to control in PD or FTD cases. The increased dopaminergic tone created in the OBs of these patients could reflect a compensatory mechanism created by the early degeneration of other neurotransmitter systems and might contribute to the olfactory dysfunction exhibited by patients with neurodegenerative disorders.

journal_name

Acta Neuropathol

journal_title

Acta neuropathologica

authors

Mundiñano IC,Caballero MC,Ordóñez C,Hernandez M,DiCaudo C,Marcilla I,Erro ME,Tuñon MT,Luquin MR

doi

10.1007/s00401-011-0830-2

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

61-74

issue

1

eissn

0001-6322

issn

1432-0533

journal_volume

122

pub_type

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