Toll-like receptor 7 (TLR7) modulates anti-nucleosomal autoantibody isotype and renal complement deposition in mice exposed to syngeneic late apoptotic cells.

Abstract:

OBJECTIVES:The objectives of this study were to determine whether late apoptotic cell material directly induces autoantibodies characteristic of systemic lupus erythematosus (SLE) and to investigate the innate recognition pathways involved. METHODS:B6, B6.MyD88(-/-), B6.TLR7(-/-) and B6.TLR9(-/-) mice were subcutaneously injected with B6 syngeneic late apoptotic thymocytes (SLATs) without adjuvant on days 0, 10, 24 and 37. Sera were tested for IgG antibodies to histones and double-stranded DNA (dsDNA) by ELISA and Crithidia luciliae indirect immunofluorescence. IgG and C3 deposition in kidney glomeruli was assessed by immunostaining and fluorescence microscopy. RESULTS:SLAT injections induced anti-dsDNA and anti-histone antibodies of the IgG1 and IgG2b isotypes in B6 but not MyD88(-/-) mice. TLR7(-/-) and TLR9(-/-) mice injected with SLATs produced delayed or slightly more robust responses, respectively. SLAT injections induced IgG deposits in renal glomeruli of B6, TLR7(-/-) and TLR9(-/-) mice that were absent in MyD88(-/-) mice. Unlike B6 and TLR9(-/-) animals, TLR7(-/-) mice failed to exhibit IgG colocalised glomerular C3 deposits and demonstrated autoantibodies of primarily the IgG2a isotype. CONCLUSIONS:Late apoptotic cell-induced anti-histone and anti-dsDNA antibodies require MyD88 but not Toll-like receptor (TLR)9. Moreover, TLR7 promotes glomerular C3 deposition, possibly through a mechanism of altered antibody isotype switching.

journal_name

Ann Rheum Dis

authors

Pan ZJ,Maier S,Schwarz K,Azbill J,Akira S,Uematsu S,Farris AD

doi

10.1136/ard.2009.108282

subject

Has Abstract

pub_date

2010-06-01 00:00:00

pages

1195-9

issue

6

eissn

0003-4967

issn

1468-2060

pii

ard.2009.108282

journal_volume

69

pub_type

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