HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Seth, A. Articles by Matsubara, J. Search for Related Content PubMed PubMed Citation Articles by Seth, A. Articles by Matsubara, J.

Complement-Associated Deposits in the Human Retina

From the Department of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, British Columbia, Canada.

PURPOSE. The purpose of this study was to investigate complement activation and associated inflammatory mechanisms in normal, aged human retina.

METHODS. Evidence of complement activation and associated mechanisms was assessed in normal human retina (n = 52) using a panel of antibodies directed against membrane attack complex (C5b-9), microglia (CD11b), amyloid precursor protein (APP), scavenger receptor (CD36), and a phytolectin (RCA-I). Fifty-two eyes, categorized into two age groups, were used. Nineteen "younger" eyes (<56 years) and 33 "older" eyes (>69 years) with no history of ocular disease were processed between 4 and 22 hours, with a median delay of 14 hours postmortem.

RESULTS. Age-dependent expression was evident in C5b-9, APP, CD11b, and RCA-I, but not CD36, immunoreactivity. Immunoreactivity for C5b-9 was robust in Bruch membrane (BM) and the intercapillary pillars of Bruch. Immunoreactivity for APP was robust in the basal cytoplasm of the retinal pigment epithelium. Immunoreactivity for CD11b was robust on the surface of the retinal pigment epithelial cell, in the choriocapillaris, and in BM. Lectin binding of RCA-I was strong throughout the neuroretina.

CONCLUSIONS. Robust immunostaining for APP in older donor eyes suggested that amyloid beta peptides may be one of the triggers of complement activation during the normal aging process. Microglial markers CD11b and RCA-I also increase with age, suggesting a concomitant inflammatory response to C5b-9 deposits in the retinal pigment epithelium, BM, and CC. Immunoreactivity for CD36 was strong in both age groups; the lack of age dependence in this candidate receptor for amyloid beta suggested that complement activation may arise from interactions of amyloid beta with other candidate receptors in normal human retina.

This article has been cited by other articles:

				A. Ning, J. Cui, E. To, K. H. Ashe, and J. Matsubara Amyloid-{beta} Deposits Lead to Retinal Degeneration in a Mouse Model of Alzheimer Disease Invest. Ophthalmol. Vis. Sci., November 1, 2008; 49(11): 5136 - 5143. [Abstract] [Full Text] [PDF]