Changes in the intracellular microenvironment in the aging human brain

Dinesh K. Deelchand; J. Riley McCarten; Laura S. Hemmy; Edward J. Auerbach; Lynn E. Eberly; Małgorzata Marjańska

doi:10.1016/j.neurobiolaging.2020.07.017

Changes in the intracellular microenvironment in the aging human brain

Dinesh K. Deelchand, J. Riley McCarten, Laura S. Hemmy, Edward J. Auerbach, Lynn E. Eberly, Małgorzata Marjańska

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Normal brain aging is associated with changes occurring at all levels. This study investigates age-related differences in the brain intracellular microenvironment by comparing the apparent diffusion coefficients (ADC) and apparent transverse relaxation time constants (T₂) of 5 neurochemicals (i.e., total N-acetyl-aspartate, total creatine, total choline, glutamate, and myo-inositol) between young and older adults. Thirty-two young healthy adults (18–22 years) and 26 older healthy adults (70–83 years) were recruited. Three brain regions were studied at 3 T: prefrontal, posterior cingulate and occipital cortices. ADC and T₂ were measured using stimulated echo acquisition mode and localization by adiabatic selective refocusing sequences, respectively. This study shows that the diffusivities of several neurochemicals are higher in older than in younger adults. In contrast, shorter apparent T₂ values for several metabolites were measured in older adults. Age-related difference in ADC and apparent T₂ of metabolites seem to be region-specific. Furthermore, this study shows that it is feasible to observe age-related differences in the cellular microenvironment of neurochemicals in the normal aging brain.

Original language	English (US)
Pages (from-to)	168-175
Number of pages	8
Journal	Neurobiology of Aging
Volume	95
DOIs	https://doi.org/10.1016/j.neurobiolaging.2020.07.017
State	Published - Nov 2020

Bibliographical note

Funding Information:
The authors would like to thank Andrew Oliver and Sarah Bedell for study coordination, Akshay Patke for neuropsychological testing, and Emily Kittelson and Andrea Grant, PhD, for technical support. This work was supported by funding from the National Institutes of Health grants ( R21AG045606 , P41 EB015894 , P30 NS076408 ).

Publisher Copyright:
© 2020 Elsevier Inc.

Keywords

ADC
Diffusion
Magnetic resonance spectroscopy
T
Young

Center for Magnetic Resonance Research (CMRR) tags

ANDI
SMCT

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title = "Changes in the intracellular microenvironment in the aging human brain",

abstract = "Normal brain aging is associated with changes occurring at all levels. This study investigates age-related differences in the brain intracellular microenvironment by comparing the apparent diffusion coefficients (ADC) and apparent transverse relaxation time constants (T2) of 5 neurochemicals (i.e., total N-acetyl-aspartate, total creatine, total choline, glutamate, and myo-inositol) between young and older adults. Thirty-two young healthy adults (18–22 years) and 26 older healthy adults (70–83 years) were recruited. Three brain regions were studied at 3 T: prefrontal, posterior cingulate and occipital cortices. ADC and T2 were measured using stimulated echo acquisition mode and localization by adiabatic selective refocusing sequences, respectively. This study shows that the diffusivities of several neurochemicals are higher in older than in younger adults. In contrast, shorter apparent T2 values for several metabolites were measured in older adults. Age-related difference in ADC and apparent T2 of metabolites seem to be region-specific. Furthermore, this study shows that it is feasible to observe age-related differences in the cellular microenvironment of neurochemicals in the normal aging brain.",

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note = "Funding Information: The authors would like to thank Andrew Oliver and Sarah Bedell for study coordination, Akshay Patke for neuropsychological testing, and Emily Kittelson and Andrea Grant, PhD, for technical support. This work was supported by funding from the National Institutes of Health grants ( R21AG045606 , P41 EB015894 , P30 NS076408 ). Publisher Copyright: {\textcopyright} 2020 Elsevier Inc.",

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N2 - Normal brain aging is associated with changes occurring at all levels. This study investigates age-related differences in the brain intracellular microenvironment by comparing the apparent diffusion coefficients (ADC) and apparent transverse relaxation time constants (T2) of 5 neurochemicals (i.e., total N-acetyl-aspartate, total creatine, total choline, glutamate, and myo-inositol) between young and older adults. Thirty-two young healthy adults (18–22 years) and 26 older healthy adults (70–83 years) were recruited. Three brain regions were studied at 3 T: prefrontal, posterior cingulate and occipital cortices. ADC and T2 were measured using stimulated echo acquisition mode and localization by adiabatic selective refocusing sequences, respectively. This study shows that the diffusivities of several neurochemicals are higher in older than in younger adults. In contrast, shorter apparent T2 values for several metabolites were measured in older adults. Age-related difference in ADC and apparent T2 of metabolites seem to be region-specific. Furthermore, this study shows that it is feasible to observe age-related differences in the cellular microenvironment of neurochemicals in the normal aging brain.

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Changes in the intracellular microenvironment in the aging human brain

Abstract

Bibliographical note

Keywords

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