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Age‐related changes in brain energetics and phospholipid metabolism
Author(s) -
Forester Brent P.,
Berlow Yosef A.,
Harper David G.,
Jensen J. Eric,
Lange Nicholas,
Froimowitz Michael P.,
Ravichandran Caitlin,
Iosifescu Dan V.,
Lukas Scott E.,
Renshaw Perry F.,
Cohen Bruce M.
Publication year - 2010
Publication title -
nmr in biomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.278
H-Index - 114
eISSN - 1099-1492
pISSN - 0952-3480
DOI - 10.1002/nbm.1444
Subject(s) - metabolism , white matter , phospholipid , bioenergetics , energy metabolism , medicine , intracellular , metabolite , endocrinology , chemistry , physiology , biology , biochemistry , mitochondrion , magnetic resonance imaging , membrane , radiology
Abstract Evidence suggests that mitochondria undergo functional and morphological changes with age. This study aimed to investigate the relationship of brain energy metabolism to healthy aging by assessing tissue specific differences in metabolites observable by phosphorus ( 31 P) MRS. 31 P MRSI at 4 Tesla (T) was performed on 34 volunteers, aged 21–84, screened to exclude serious medical and psychiatric diagnoses. Linear mixed effects models were used to analyze the effects of age on phosphorus metabolite concentrations, intracellular magnesium and pH estimates in brain tissue. A significant age associated decrease in brain pH (−0.53% per decade), increase in PCr (1.1% per decade) and decrease in PME (1.7% per decade) were found in total tissue, with PCr effects localized to the gray matter. An increase in beta NTP as a function of age (1% per decade) approached significance ( p = 0.052). There were no effects demonstrated with increasing age for intracellular magnesium, PDE or inorganic phosphate. This study reports the effects of healthy aging on brain chemistry in the gray matter versus white matter using 31 P MRS measures of high energy phosphates, pH and membrane metabolism. Increased PCr, increased beta NTP (reflecting ATP) and reduced pH may reflect altered energy production with healthy aging. Unlike some previous studies of aging and brain chemistry, this study examined healthy, non‐demented and psychiatrically stable older adults and specifically analyzed gray‐white matter differences in brain metabolism. Copyright © 2009 John Wiley & Sons, Ltd.