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March 04, 2014; 82 (9) Article

Brain imaging of cognitively normal individuals with 2 parents affected by late-onset AD

Lisa Mosconi, John Murray, Wai H. Tsui, Yi Li, Nicole Spector, Alexander Goldowsky, Schantel Williams, Ricardo Osorio, Pauline McHugh, Lidia Glodzik, Shankar Vallabhajosula, Mony J. de Leon
First published February 12, 2014, DOI: https://doi.org/10.1212/WNL.0000000000000181
Lisa Mosconi
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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John Murray
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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Wai H. Tsui
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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Yi Li
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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Nicole Spector
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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Alexander Goldowsky
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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Schantel Williams
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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Ricardo Osorio
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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Pauline McHugh
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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Lidia Glodzik
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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Shankar Vallabhajosula
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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Mony J. de Leon
From the New York University School of Medicine (L.M., J.M., W.H.T., Y.L., N.S., A.G., S.W., R.O., P.M., L.G., M.J.d.L.); and Weill Cornell Medical College (S.V.), New York.
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Citation
Brain imaging of cognitively normal individuals with 2 parents affected by late-onset AD
Lisa Mosconi, John Murray, Wai H. Tsui, Yi Li, Nicole Spector, Alexander Goldowsky, Schantel Williams, Ricardo Osorio, Pauline McHugh, Lidia Glodzik, Shankar Vallabhajosula, Mony J. de Leon
Neurology Mar 2014, 82 (9) 752-760; DOI: 10.1212/WNL.0000000000000181

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Abstract

Objectives: This brain imaging study examines whether cognitively normal (NL) individuals with 2 parents affected by late-onset Alzheimer disease (LOAD) show evidence of more extensive Alzheimer disease pathology compared with those who have a single parent affected by LOAD.

Methods: Fifty-two NL individuals received MRI, 11C-Pittsburgh compound B (PiB)-PET, and 18F-fluoro-2-deoxyglucose (FDG)-PET. These included 4 demographically balanced groups (n = 13/group, aged 32–72 years, 60% female, 30% APOE ε4 carriers) of NL individuals with maternal (FHm), paternal (FHp), and maternal and paternal (FHmp) family history of LOAD, and with negative family history (FH−). Statistical parametric mapping, voxel-based morphometry, and z-score mapping were used to compare MRI gray matter volumes (GMVs), partial volume–corrected PiB retention, and FDG metabolism across FH groups and vs FH−.

Results: NL FHmp showed more severe abnormalities in all 3 biomarkers vs the other groups regarding the number of regions affected and magnitude of impairment. PiB retention and hypometabolism were most pronounced in FHmp, intermediate in FHm, and lowest in FHp and FH−. GMV reductions were highest in FHmp and intermediate in FHm and FHp vs FH−. In all FH+ groups, amyloid-β deposition exceeded GMV loss and hypometabolism exceeded GMV loss (p < 0.001), while amyloid-β deposition exceeded hypometabolism in FHmp and FHp but not in FHm.

Conclusions: These biomarker findings show a “LOAD parent-dose effect” in NL individuals several years, if not decades, before possible clinical symptoms.

GLOSSARY

Aβ=
β-amyloid;
AD=
Alzheimer disease;
EOAD=
early-onset Alzheimer disease;
FDG=
18F-fluoro-2-deoxyglucose;
FH=
family history;
FH−=
negative family history;
FHm=
family history maternal;
FHmp=
family history maternal and paternal;
FHp=
family history paternal;
FWHM=
full width at half maximum;
GM=
gray matter;
GMV=
gray matter volume;
LOAD=
late-onset Alzheimer disease;
MNI=
Montreal Neurological Institute;
NL=
normal;
PiB=
Pittsburgh compound B;
PVC=
partial volume correction (–corrected);
SPM=
statistical parametric mapping;
TIV=
total intracranial volume;
TPM=
tissue probability map;
VBM=
voxel-based morphometry

Footnotes

  • Go to Neurology.org for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.

  • Supplemental data at www.neurology.org

  • Received August 7, 2013.
  • Accepted in final form November 22, 2013.
  • © 2014 American Academy of Neurology
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