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146 mfte: rtrctxu"suopteRwt&fttsptf,if
Summary
'
Immunohistochemicalstudy of proteins related to the pathophysiologyof Alzheimer's
diseaseinthe human retina of elderly patientswithout dementia.
Objective: The pathological featuresof Alzheimer'sdisease(AD )includeneuritic plaques
(NP )composed of amyloid-beta peptide (AP )fibrils,neurofibrillary tangles(NIJ"I')ofhy-
perphosphorylated Tau, and neurotransmitter deficits.Human retinal synapses directlyas-
sociate with the central nervous system (CNS )through theoptic nerve, and the bilateraloptic
nerves are both derivedfrom the same origin, neural ectoderm. Therefore,itispossible th'atthere
would be neuropathological changes intheretina ofAD,patient$ similqr to those inthe CNS. As
there are age-related changes observed inthe retina, itwould'be impgrtantto investigatethe lo-
cation of protein$ related to the neurodegeneration and pathophysiology ofAD inthe retina. In
this study ,
we investigatedthe existence and expression pattern of AD-relatedneuropatholeg-
icalchanges inthe retina and optic nerve of elderly patients without dernentia.
Subjectsand methods: Retinalsamples of six individualswithout dementiawere obtained
from the eye bank ofJuntendo Universityhospital.The mean age ± SD was 68.3± 6.1years.By
immunohistochemical analysis ,the presence of ten kinds of proteins related to neurodegener-
ation and AD pathology (advanced glycationend-products , cathepsin D , amyloid P -precursor
protein , ubiquitin , calretinin, nitrotyrosine , a -synuclein , PHF-Tau, Tau, single stranded
DNA )were detectedusing separate antiboclies,
Results: We foundthatPHF-Tau, an importantcomponent of amyloid P -precursorprotein and
a major component of NP and NFI", was strongly expressed in the retina except for single-
stranded DNA. Other proteins also shewed medium to strong signals with particular patterns.
Conclusion: These findingsdemon$trateforthe firsttime the locationof proteinsrelated to
AD inthe retina of elderly patients without dementia, indicatinga relationship between the ag-
ingprocess and neurodegeneration inthehuman retina. Furtherneuropatho]ogical studies of the
retina from bothyoung patientswithout dementiaand patientswith AP should be investigated
inthe future.
Keywords : elderlyperson , Alzheimer'sdisease(AD ), retina,
immunohistochemistry, aging process