Development of experimental autoimmune uveitis: efficient recruitment of monocytes is independent of CCR2.
OBJECTIVE
Macrophages are major contributors to the damage occurring in the retina in experimental autoimmune uveitis (EAU). CCR2 may be needed for efficient recruitment of monocytes to an inflammatory site, and the aim of this study was to determine whether this was the case in EAU.


METHODS
EAU was induced and graded in C57BL/6J and CCR2(-/-) mice. Macrophage infiltration and CCR2 expression were assessed using immunohistochemistry. Retinas were examined for MCP-1 expression using RT-PCR. Rolling and infiltration of labeled bone marrow monocytes at the inflamed retinal vasculature were examined by scanning laser ophthalmoscopy and confocal microscopy, respectively. Effect of CCR2 deletion or blockade by antibody and antagonist was determined.


RESULTS
Expression of mRNA for MCP-1 increased as EAU developed and was localized to the retina. CCR2 was associated with infiltrating macrophages. However, EAU induced in CCR2(-/-) mice was not reduced in severity, and neither was the percentage of macrophages in the retina. CCR2(-/-) monocytes, 48 hours after adoptive transfer to mice with EAU, showed no significant difference in percentage rolling or infiltration into the retina compared to WT. CCR2-independent rolling of monocytes was confirmed by CCR2 neutralizing antibody and antagonist treatment.


CONCLUSIONS
CCR2 does not have a primary role in the recruitment of monocytes to the inflammatory site across the blood-retina barrier in well-developed EAU. Therapeutics targeting CCR2 are unlikely to be of value in treating human posterior uveitis.
Division of Applied Medicine, University of Aberdeen, Aberdeen, United Kingdom.
Athanasios
A
Dagkalis
Carol
C
Wallace
Heping
H
Xu
Sebastian
S
Liebau
Ayyakkannu
A
Manivannan
Michael A
MA
Stone
Matthias
M
Mack
Janet
J
Liversidge
Isabel J
IJ
Crane
D019264:Adoptive Transfer; D000818:Animals; D001327:Autoimmune Diseases / Q000139:chemically induced / Q000276:immunology*; D001854:Bone Marrow Cells; D018932:Chemokine CCL2 / Q000235:genetics; D004195:Disease Models, Animal; D007124:Immunoenzyme Techniques; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D018613:Microscopy, Confocal; D009000:Monocytes / Q000276:immunology*; D009887:Ophthalmoscopy; D012333:RNA, Messenger / Q000378:metabolism; D054390:Receptors, CCR2 / Q000502:physiology*; D012160:Retina / Q000378:metabolism; D012171:Retinal Vessels / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014605:Uveitis / Q000139:chemically induced / Q000276:immunology*
C491768:Ccl2 protein, mouse; C515335:Ccr2 protein, mouse; D018932:Chemokine CCL2; D012333:RNA, Messenger; D054390:Receptors, CCR2