TY - JOUR
T1 - Magnetic resonance spectroscopy, β-amyloid load, and cognition in a population-based sample of cognitively normal older adults
AU - Kantarci, Kejal M
AU - Lowe, Val
AU - Przybelski, S. A.
AU - Senjem, M. L.
AU - Weigand, S. D.
AU - Ivnik, R. J.
AU - Roberts, Rosebud O
AU - Geda, Yonas Endale
AU - Boeve, Bradley F
AU - Knopman, David S
AU - Petersen, Ronald Carl
AU - Jack, Clifford R Jr.
PY - 2011/9/6
Y1 - 2011/9/6
N2 - Objective: To determine the relationship between proton magnetic resonance spectroscopy (1H MRS) metabolites and β-amyloid (Aβ) load and the effects of Aβ load on the association between 1H MRS metabolites and cognitive function in cognitively normal older adults. Methods: We studied 311 cognitively normal older adults who participated in the populationbased Mayo Clinic Study of Aging from January 2009 through September 2010. Participants underwent 11C-Pittsburgh compound B (PiB) PET, 1H MRS from the posterior cingulate gyri, and neuropsychometric testing to assess memory, attention/executive, language, and visual-spatial domain functions within 6 months. Partial Spearman rank order correlations were adjusted for age, sex, and education. Results: Higher PiB retention was associated with abnormal elevations in myoinositol (mI)/creatine (Cr) (partial rs = 0.17; p = 0.003) and choline (Cho)/Cr (partial rs = 0.13; p = 0.022) ratios. Higher Cho/Cr was associated with worse performance on Auditory Verbal Learning Test Delayed Recall (partial rs = -0.12; p = 0.04), Trail Making Test Part B (partial rs = 0.12; p = 0.04), Wechsler Adult Intelligence Scale-Revised (WAIS-R) Digit Symbol (partial r s = -0.18; p < 0.01), and WAIS-R Block Design (partial r s=-0.12; p = 0.03). Associations between 1H MRS metabolites and cognitive function were not different among participants with high vs low PiB retention. Conclusion: In cognitively normal older adults, the 1H MRS metabolite ratios mI/Cr and Cho/Cr are associated with the preclinical pathologic processes in the Alzheimer disease cascade. Higher Cho/Cr is associated with worse performance on domain-specific cognitive tests independent of Aβ load, suggesting that Cho/Cr elevation may also be dependent on other preclinical dementia pathologies characterized by Cho/Cr elevation such as Lewy body or ischemic vascular disease in addition to Aβ load.
AB - Objective: To determine the relationship between proton magnetic resonance spectroscopy (1H MRS) metabolites and β-amyloid (Aβ) load and the effects of Aβ load on the association between 1H MRS metabolites and cognitive function in cognitively normal older adults. Methods: We studied 311 cognitively normal older adults who participated in the populationbased Mayo Clinic Study of Aging from January 2009 through September 2010. Participants underwent 11C-Pittsburgh compound B (PiB) PET, 1H MRS from the posterior cingulate gyri, and neuropsychometric testing to assess memory, attention/executive, language, and visual-spatial domain functions within 6 months. Partial Spearman rank order correlations were adjusted for age, sex, and education. Results: Higher PiB retention was associated with abnormal elevations in myoinositol (mI)/creatine (Cr) (partial rs = 0.17; p = 0.003) and choline (Cho)/Cr (partial rs = 0.13; p = 0.022) ratios. Higher Cho/Cr was associated with worse performance on Auditory Verbal Learning Test Delayed Recall (partial rs = -0.12; p = 0.04), Trail Making Test Part B (partial rs = 0.12; p = 0.04), Wechsler Adult Intelligence Scale-Revised (WAIS-R) Digit Symbol (partial r s = -0.18; p < 0.01), and WAIS-R Block Design (partial r s=-0.12; p = 0.03). Associations between 1H MRS metabolites and cognitive function were not different among participants with high vs low PiB retention. Conclusion: In cognitively normal older adults, the 1H MRS metabolite ratios mI/Cr and Cho/Cr are associated with the preclinical pathologic processes in the Alzheimer disease cascade. Higher Cho/Cr is associated with worse performance on domain-specific cognitive tests independent of Aβ load, suggesting that Cho/Cr elevation may also be dependent on other preclinical dementia pathologies characterized by Cho/Cr elevation such as Lewy body or ischemic vascular disease in addition to Aβ load.
UR - http://www.scopus.com/inward/record.url?scp=80055073182&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80055073182&partnerID=8YFLogxK
U2 - 10.1212/WNL.0b013e31822dc7e1
DO - 10.1212/WNL.0b013e31822dc7e1
M3 - Article
C2 - 21865577
AN - SCOPUS:80055073182
VL - 77
SP - 951
EP - 958
JO - Neurology
JF - Neurology
SN - 0028-3878
IS - 10
ER -