Cited by 63Olfactory and Sensory Function StudiesDementia and Cognitive Impairment ResearchAlzheimer's disease research and treatments

Olfactory dysfunction: its early temporal relationship and neural correlates in the pathogenesis of Alzheimer’s disease

Daulatzai, Mak Adam·2015·Journal of Neural Transmission

Abstract

We interact with the physical world through our senses, and these aid our behavioral performance and various activities of life. Sensory information is transmitted in neuronal networks, and the brain optimally interprets the external and internal milieu/environment. This paper delineates the framework in which the pathogenesis of memory and cognitive dysfunction is underpinned by sensory olfactory dysfunction. ERC is the gateway for olfactory input to the hippocampus, and there is seamless synchronization between sensory function and hippocampal activity. Transmission of olfactory information to the hippocampus is sequential-it is projected from the olfactory receptors to olfactory bulb to the primary olfactory cortex (comprised the anterior olfactory nucleus, the olfactory tubercle, and the piriform cortex) to the entorhinal cortex (ERC). Through perforant pathway ERC enables olfactory inputs to effectively excite hippocampal neurons. One of the earliest pathological changes in Alzheimer's disease (AD) include the olfactory dysfunction and the atrophy in ERC and hippocampus (rate in ERC is higher than in the hippocampus). Olfactory dysfunction negatively impacts the ERC and the deafferenting of the hippocampus from olfactory inputs upregulates memory decline. Olfactory dysfunction, therefore, is an important and early correlate of AD pathology. A number of factors described here may cause olfactory dysfunction; this may lead to hypoperfusion, hypometabolism, impaired synaptic transmission, and variable atrophy in olfaction-related regions. Improvement in olfactory function, therefore, is an important goal in order to attenuate cognitive neuropathology in aging and AD. This article seeks to provide a comprehensive and balanced overview of olfactory neuropathology in incipient AD, and suggests strategies to enhance olfactory function and ameliorate cognitive decline.

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Crossref · 10.1007/s00702-015-1404-6

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  • The olfactory bulb, which connects to the entorhinal cortex, is directly affected by changes in the perforant pathway and is one of the earliest pathological changes in AD.

    “the connection to the entorhinal cortex, the olfactory bulb, is directly affected by changes in the perforant pathway, and one of the earliest pathological changes in AD”

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Authors
Daulatzai, M. A.
Affiliations
The University of Melbourne (AU)
Corresponding author
Daulatzai, Mak Adam
Venue
Journal of Neural Transmission
Published
2015-05-06
Volume
122
Issue
10
Pages
1475-1497
ISSN
  • 0300-9564 (ISSN-L)
  • 1435-1463
OpenAlex
W215713836
Cited by
63
References
359
Citations by year
2026: 4 · 2025: 5 · 2024: 6 · 2023: 6 · 2022: 1 · 2021: 6 · 2020: 6 · 2019: 4 · 2018: 9 · 2017: 10 · 2016: 5 · 2015: 1
FWCI
1.24
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neural Transmission (publishedVersion)
  • PubMed (publishedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Sensory Systems › Olfactory and Sensory Function Studies
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
olfactory dysfunction, Alzheimer's disease, entorhinal cortex, hippocampus, perforant path, olfactory bulb, piriform cortex, anterior olfactory nucleus, olfactory tubercle, deafferentation, memory decline, cognitive decline, early biomarkers
MeSH terms
Alzheimer Disease, Animals, Olfaction Disorders, Brain, Humans, Disease Progression, Olfactory Perception

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