Exp Neurobiol.  2019 Jun;28(3):376-389. 10.5607/en.2019.28.3.376.

Metabolomic Analysis Identifies Alterations of Amino Acid Metabolome Signatures in the Postmortem Brain of Alzheimer's Disease

Affiliations
  • 1MolecularRecognition Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea. frans@kist.re.kr
  • 2Department of Biotechnology, Graduate School, Korea University, Seoul 02792, Korea.
  • 3Center for Neuroscience, Brain Science Institute, Korea Institute of Science and Technology, Seoul 02792, Korea. hoonryu@bu.edu
  • 4Veteran's Affairs Boston Healthcare System, Boston, MA 02130, USA.
  • 5Boston University Alzheimer's Disease Center and Department of Neurology, Boston University School of Medicine, Boston, MA 02118, USA.
  • 6Convergence Research Center for Diagnosis, Treatment and Care System of Dementia, Korea Institute of Science and Technology, Seoul 02792, Korea.

Abstract

Despite significant advances in neuroscience research over the past several decades, the exact cause of AD has not yet fully understood. The metabolic hypothesis as well as the amyloid and tau hypotheses have been proposed to be associated with AD pathogenesis. In order to identify metabolome signatures from the postmortem brains of sporadic AD patients and control subjects, we performed ultra performance liquid chromatography coupled with linear ion trap-Orbitrap mass spectrometer (UPLC-LTQ-Orbitrap-MS). Not only our study identified new metabolome signatures but also verified previously known metabolome profiles in the brain. Statistical modeling of the analytical data and validation of the structural assignments discovered metabolic biomarkers associated with the AD pathogenesis. Interestingly, hypotaurin, myo-inositol and oxo-proline levels were markedly elevated in AD while lutamate and N-acetyl-aspartate were decreased in the postmortem brain tissue of AD patients. In addition, neurosteroid level such as cortisol was significantly increased in AD. Together, our data indicate that impaired amino acid metabolism is associated with AD pathogenesis and the altered amino acid signatures can be useful diagnostic biomarkers of AD. Thus, modulation of amino acid metabolism may be a possible therapeutic approach to treat AD.

Keyword

Alzheimer's disease; Metabolomics; Liquid chromatography mass spectrometry; Biomarkers; amino acid metabolism

MeSH Terms

Alzheimer Disease*
Amyloid
Biomarkers
Brain*
Chromatography, Liquid
Humans
Hydrocortisone
Metabolism
Metabolome*
Metabolomics*
Models, Statistical
Neurosciences
Amyloid
Biomarkers
Hydrocortisone
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