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MHC class II expression by β2 integrin (CD18)-positive microglia, macrophages and macrophage-like cells in rabbit retina

Published online by Cambridge University Press:  06 July 2009

Wenbing Huang
Affiliation:
School of Medical Sciences (Anatomy and Histology) and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
Coral G. Chamberlain
Affiliation:
School of Medical Sciences (Anatomy and Histology) and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
Richard Y. Sarafian
Affiliation:
School of Medical Sciences (Anatomy and Histology) and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
Tailoi Chan-Ling*
Affiliation:
School of Medical Sciences (Anatomy and Histology) and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
*
Correspondence should be addressed to: Tailoi Chan-Ling, Anatomy and Histology (F13), School of Medical Sciences and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia phone: +61 2 9351 2596 fax: +61 2 9351 6556 email: tailoi@anatomy.usyd.edu.au

Abstract

The aim of this study was to investigate the developmental expression of major histocompatibility complex class II (MHCII) by microglia and macrophages and their relationship to blood vessels in the retina, a representative tissue of the central nervous system. Such information is crucial to understanding the role of these cells in immune surveillance. Wholemount preparations of retinas from late embryonic, postnatal and adult rabbits were subjected to three-colour fluorescence microscopy using β2 integrin (CD18) and MHCII antibodies and biotinylated Griffonia simplicifolia B4 isolectin labelling of blood vessels. CD18+ cells consistently exhibited characteristics of macrophages or microglia in the vascularized and non-vascularized regions of the retina, respectively. At all ages, MHCII was expressed by a high proportion of cells in the vascularized region, which contained macrophage-like ‘parenchymal cells’ as well as typical perivascular macrophages. MHCII expression by ramified microglia, first detected on postnatal day 30, was lower in the peripheral retina and intermediate in the avascular region of the myelinated streak. The observed localization of MHCII+ cells in relation to blood vessels and location-dependent differences in MHCII expression point to the possibility that these cells may be distributed strategically within the retina to provide multiple lines of defence against immune challenge arriving via the retinal vasculature.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2009

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