APOE E4 is a determinant for Alzheimer type pathology in progressive supranuclear palsy.
OBJECTIVE
To assess demographic and genetic determinants of Alzheimer type pathology in progressive supranuclear palsy (PSP).


METHODS
From a total of 173 pathologically proven cases of PSP in the Society for PSP Brain Bank, 143 patients (mean age = 74.4 years, ranging from 42 to 98 years) were suitable for genetic and pathologic study. Senile plaques (SPs) and neurofibrillary tangles (NFTs) were counted in five cortical areas, Braak stage was given, and APOE genotype was determined from DNA isolated from frozen brain tissue. The APOE allele frequency in PSP with varying degrees of concomitant Alzheimer type pathology was compared with pure PSP and autopsy controls. The relationship of APOE epsilon4 to quantitative pathologic measures was also assessed.


RESULTS
Most patients with PSP (103 cases) had either minimal or no Alzheimer type pathology (Braak stage III or less), but 14 patients had many SPs (>20 per low power field) and a Braak stage of IV or higher consistent with pathologic criteria for AD, and 26 patients had many diffuse plaques with minimal neurofibrillary degeneration (Braak stage III or less) consistent with pathologic aging. Alzheimer type pathology was more frequent in women and older individuals with PSP, and 19 of the 40 patients with PSP with Alzheimer type pathology carried at least one APOE epsilon4 allele. The epsilon4 allele frequency was significantly higher in PSP with AD or pathologic aging than in pure PSP, and APOE epsilon4 correlated with the average maximal density of both neocortical SPs and NFTs.


CONCLUSIONS
APOE epsilon4 is a risk factor for Alzheimer type pathology in PSP. Alzheimer type pathology is an independent process unrelated to PSP in cases with both types of pathologies.
Tsuboi
Yoshio
Y
Department of Neurology, Mayo Clinic, Jacksonville, FL, USA.
Josephs
Keith A
KA
Cookson
Natalie
N
Dickson
Dennis W
DW
D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D000544:Alzheimer Disease / Q000473:pathology*; D053327:Apolipoprotein E4; D001057:Apolipoproteins E / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D016874:Neurofibrillary Tangles / Q000473:pathology; D058225:Plaque, Amyloid / Q000473:pathology; D012307:Risk Factors; D012737:Sex Factors; D018709:Statistics, Nonparametric; D013494:Supranuclear Palsy, Progressive / Q000145:classification / Q000235:genetics* / Q000473:pathology*
D053327:Apolipoprotein E4; D001057:Apolipoproteins E