title: Evidence that anti-muscarinic antibodies in Sjögren's syndrome recognise both M3R and M1R.
abstract: Inhibitory anti-muscarinic receptor type 3 (M3R) antibodies may contribute to the pathogenesis of Sjögren's syndrome (SS), and putative anti-M3R blocking antibodies in intravenous immunoglobulin (IVIg) have been suggested as a rationale for treatment with IVIg. We investigated the presence of subtype-specific anti-MR autoantibodies in healthy donor and SS sera using MR-transfected whole-cell binding assays as well as M1R and M3R peptide ELISAs. Control antibodies against the second extracellular loop of the M3R, a suggested target epitope, were induced in rabbits and found to be cross-reactive on the peptides M3R and M1R. The rabbit antibodies had neither an agonistic nor an antagonistic effect on M3R-dependent ERK1/2 signalling. Only one primary SS (out of 5 primary SS, 2 secondary SS and 5 control sera) reacted strongly with M3R transfected cells. The same SS serum also reacted strongly with M1R and M2R transfectants, as well as M1R and two different M3R peptides. Strong binding to M1R and low-level activities against M3R peptides were observed both in SS and control sera. IVIg showed a strong reactivity against all three peptides, especially M1R. Our results indicate that certain SS individuals may have antibodies against M1R, M2R and M3R. Our results also suggest that neither the linear M3R peptide nor M3R transfectants represent suitable tools for discrimination of pathogenic from natural autoantibodies in SS.
authors.affiliation: Institute of Immunology, University Hospital Bern, 3010 Bern, Switzerland. vanessa.schegg@cslbehring.com
authors.forename: Vanessa
authors.initials: V
authors.lastname: Schegg
authors.forename: Monique
authors.initials: M
authors.lastname: Vogel
authors.forename: Svetlana
authors.initials: S
authors.lastname: Didichenko
authors.forename: Michael B
authors.initials: MB
authors.lastname: Stadler
authors.forename: Zsuzsanna
authors.initials: Z
authors.lastname: Beleznay
authors.forename: Stephan
authors.initials: S
authors.lastname: Gadola
authors.forename: Christine
authors.initials: C
authors.lastname: Sengupta
authors.forename: Beda M
authors.initials: BM
authors.lastname: Stadler
authors.forename: Sylvia M
authors.initials: SM
authors.lastname: Miescher
mesh_terms: D000818:Animals; D001323:Autoantibodies / Q000378:metabolism* / Q000502:physiology; D016466:CHO Cells; D006224:Cricetinae; D003412:Cricetulus; D003429:Cross Reactions / Q000276:immunology*; D006801:Humans; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D010446:Peptide Fragments / Q000276:immunology; D010766:Phosphorylation; D011485:Protein Binding; D011817:Rabbits; D043643:Receptor, Muscarinic M1 / Q000276:immunology / Q000378:metabolism*; D043587:Receptor, Muscarinic M3 / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D012859:Sjogren's Syndrome / Q000097:blood / Q000276:immunology* / Q000473:pathology; D014162:Transfection
chemical_list: D001323:Autoantibodies; D010446:Peptide Fragments; D043643:Receptor, Muscarinic M1; D043587:Receptor, Muscarinic M3; D048052:Mitogen-Activated Protein Kinase 3