Cited by 22Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsMedical Imaging Techniques and Applications

Molecular imaging of the association between serotonin degeneration and beta-amyloid deposition in mild cognitive impairment

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Smith, Gwenn S., Protas, Hillary, Kuwabara, Hiroto, Savonenko, Alena, Nassery, Najlla, Gould, Neda F., Kraut, Michael, Avramopoulos, Dimitri +6 more·2023·NeuroImage: Clinical

Abstract

BACKGROUND: Degeneration of the serotonin system has been observed in Alzheimer's disease (AD) and in mild cognitive impairment (MCI). In transgenic amyloid mouse models, serotonin degeneration is detected prior to widespread cortical beta-amyloid (Aβ) deposition, also suggesting that serotonin degeneration may be observed in preclinical AD. METHODS: The differences in the distribution of serotonin degeneration (reflected by the loss of the serotonin transporter, 5-HTT) relative to Aβ deposition was measured with positron emission tomography in a group of individuals with MCI and a group of healthy older adults. A multi-modal partial least squares (mmPLS) algorithm was applied to identify the spatial covariance pattern between 5-HTT availability and Aβ deposition. RESULTS: Forty-five individuals with MCI and 35 healthy older adults were studied, 22 and 27 of whom were included in the analyses who were "amyloid positive" and "amyloid negative", respectively. A pattern of lower cortical, subcortical and limbic 5-HTT availability and higher cortical Aβ deposition distinguished the MCI from the healthy older control participants. Greater expression of this pattern was correlated with greater deficits in memory and executive function in the MCI group, not in the control group. CONCLUSION: A spatial covariance pattern of lower 5-HTT availability and Aβ deposition was observed to a greater extent in an MCI group relative to a control group and was associated with cognitive impairment in the MCI group. The results support the application of mmPLS to understand the neurochemical changes associated with Aβ deposition in the course of preclinical AD.

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Crossref · 10.1016/j.nicl.2023.103322

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  • Serotonergic dysfunction is implicated in Alzheimer's disease and Parkinson's disease progression, but probiotic interventions have shown inconsistent effects on serotonin levels in Parkinson's disease.

    “In a recent randomized controlled trial (RCT), no significant changes in serum serotonin levels were observed following a 3-month adjunctive probiotic Bifidobacterium animalis subsp. lactis treatment in PD patients receiving conventional regimen (Benserazide and dopamine agonists).491 Furthermore, the administration of L. plantarum PS128 was ineffective in restoring MPTP-induced serotonin”

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Research works printed but not linked: 2

  1. Delis D.C. Kaplan E. Kramer J.H. Delis Kaplan Executive Function System (D-KEFS) Test Review Applied 2006 Neuropsychology
  2. Delis D. Kramer J. Kaplan E. Ober B. California Verbal Learning Test (CVLT) Manual The Psychological Corporation 1987 10.1207/s15328023top2503_18 · DOI

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Authors
Smith, G. S., Protas, H., Kuwabara, H., Savonenko, A., Nassery, N., Gould, N. F., Kraut, M., Avramopoulos, D., Holt, D., Dannals, R. F., Nandi, A., Su, Y., Reiman, E. M., & Chen, K.
Affiliations
  • Johns Hopkins University (US)
  • Banner Alzheimer’s Institute (US)
Corresponding author
Smith, Gwenn S.
Venue
NeuroImage: Clinical
Publisher
Elsevier BV
Published
2023
Volume
37
Pages
103322
ISSN
2213-1582 (ISSN-L)
OpenAlex
W4313597924
Cited by
22
References
101
Citations by year
2026: 2 · 2025: 10 · 2024: 5 · 2023: 5
FWCI
4.46
Type
journal article
Language
en
Open access
Locations
  • NeuroImage Clinical (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Health (AG038893, AG041633, AG059390, MH064823, MH086881, P30 AG072980, UL1 TR 001079)
  • Arizona State University
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Medical Imaging Techniques and Applications
Keywords
serotonin transporter, amyloid-beta deposition, mild cognitive impairment, Alzheimer's disease, preclinical Alzheimer's disease, amyloid PET, memory impairment, executive dysfunction
MeSH terms
Alzheimer Disease, Animals, Serotonin, Amyloid beta-Peptides, Positron-Emission Tomography, Mice, Molecular Imaging, Cognitive Dysfunction

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