title: Two distinct classes of degenerative change are independently linked to clinical progression in mild cognitive impairment.
abstract: We previously demonstrated 2 statistically distinct factors of degeneration in Alzheimer's disease: one strongly related to white matter damage and age interpreted as "age- and vascular-related", and the other related to cortical atrophy thought to represent "neurodegenerative changes associated with Alzheimer's disease". Those factors are now replicated in a distinct cross-sectional data set of 364 participants from the Alzheimer's Disease Neuroimaging Initiative and their interpretation is improved using correlations with CSF biomarkers. Furthermore, we now show that changes in both factors over 2 years are independently associated with decline in Mini-Mental State Examination score in a longitudinal subset of 116 individuals with mild cognitive impairment. Progression in the "age- and vascular-related" factor was greater for individuals with 2 APOE ε4 alleles and linked to a greater attributable change in Mini-Mental State Examination than the "neurodegenerative" factor. These results suggest benefits of targeting white matter and vascular health to complement interventions focused on the neurodegenerative aspect of the disease, even in individuals with little discernable vascular comorbidity.
authors.affiliation: MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, USA; Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, USA; Departments of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA. Electronic address: jp@biospective.com.
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Coutu
authors.affiliation: MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, USA; Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, USA; Departments of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
authors.forename: Emily R
authors.initials: ER
authors.lastname: Lindemer
authors.affiliation: MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, USA; Departments of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
authors.forename: Ender
authors.initials: E
authors.lastname: Konukoglu
authors.affiliation: MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, USA; Departments of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Neuroimaging Research for Veterans Center, VA Boston Healthcare System, Boston, MA, USA.
authors.forename: David H
authors.initials: DH
authors.lastname: Salat
mesh_terms: D000368:Aged; D002540:Cerebral Cortex / Q000000981:diagnostic imaging / Q000473:pathology*; D060825:Cognitive Dysfunction / Q000000981:diagnostic imaging* / Q000473:pathology*; D003430:Cross-Sectional Studies; D066264:Datasets as Topic; D018450:Disease Progression; D005260:Female; D006801:Humans; D008297:Male; D009410:Nerve Degeneration; D059906:Neuroimaging; D066127:White Matter / Q000000981:diagnostic imaging / Q000473:pathology*
keywords: Alzheimer's disease; CSF biomarkers; Cognitive decline; Longitudinal cohort study; Mild cognitive impairment; Small-vessel disease; White matter