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[18F]FDDNP PET binding predicts change in executive function in a pilot clinical trial of geriatric depression

Published online by Cambridge University Press:  23 January 2020

Beatrix Krause-Sorio
Affiliation:
Semel Institute for Neuroscience and Human Behavior, UCLA, Los Angeles, CA 90095, USA
Prabha Siddarth
Affiliation:
Semel Institute for Neuroscience and Human Behavior, UCLA, Los Angeles, CA 90095, USA
Kelsey T. Laird
Affiliation:
Semel Institute for Neuroscience and Human Behavior, UCLA, Los Angeles, CA 90095, USA
Linda Ercoli
Affiliation:
Semel Institute for Neuroscience and Human Behavior, UCLA, Los Angeles, CA 90095, USA
Katherine Narr
Affiliation:
Brain Research Institute, Los Angeles, CA 90095, USA
Jorge R. Barrio
Affiliation:
Department of Molecular and Medical Pharmacology, David Geffen UCLA School of Medicine, Los Angeles, CA 90095, USA
Gary Small
Affiliation:
Semel Institute for Neuroscience and Human Behavior, UCLA, Los Angeles, CA 90095, USA
Helen Lavretsky*
Affiliation:
Semel Institute for Neuroscience and Human Behavior, UCLA, Los Angeles, CA 90095, USA
*
Correspondence should be addressed to: Helen Lavretsky, Psychiatry-in-Residence, Jane and Terry Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine at University of California, 760 Westwood Plaza, Los Angeles, CA 90095, USA. Phone: +310 794 4619; Fax: +310 206 4399. Email: hlavretsky@mednet.ucla.edu.

Abstract

Objectives:

Geriatric depression often presents with memory and cognitive complaints that are associated with increased risk for Alzheimer’s disease (AD). In a parent clinical trial of escitalopram combined with memantine or placebo for geriatric depression and subjective memory complaints, we found that memantine improved executive function and delayed recall performance at 12 months (NCT01902004). In this report, we used positron emission tomography (PET) to assess the relationship between in-vivo amyloid and tau brain biomarkers and clinical and cognitive treatment response.

Design:

In a randomized double-blind placebo-controlled trial, we measured 2-(1-{6-[(2-[F18]fluoroethyl)(methyl)amino]-2-naphthyl}ethylidene) malononitrile ([18F]FDDNP) binding at baseline and assessed mood and cognitive performance at baseline, posttreatment (6 months), and naturalistic follow-up (12 months).

Participants:

Twenty-two older adults with major depressive disorder and subjective memory complaints completed PET scans and were included in this report.

Results:

Across both treatment groups, higher frontal lobe [18F]FDDNP binding at baseline was associated with improvement in executive function at 6 months (corrected p = .045). This effect was no longer significant at 12 months (corrected p = .12). There was no association of regional [18F]FDDNP binding with change in mood symptoms (corrected p = .2).

Conclusions:

[18F]FDDNP binding may predict cognitive response to antidepressant treatment. Larger trials are required to further test the value of [18F]FDDNP binding as a biomarker for cognitive improvement with antidepressant treatment in geriatric depression.

Type
Original Research Article
Copyright
© International Psychogeriatric Association 2020

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