Induction of in vitro heart block is not restricted to affinity purified anti-52 kDa Ro/SSA antibody from mothers of children with neonatal lupus
| Autor: | V St Viana, Keith B. Elkon, J Hm Nascimento, Nathan Brot, Simone Garcia, Eloisa Bonfa, A.C. Campos de Carvalho |
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| Rok vydání: | 1998 |
| Předmět: |
medicine.medical_specialty
Counterimmunoelectrophoresis Heart block Mothers Enzyme-Linked Immunosorbent Assay 030204 cardiovascular system & hematology Pharmacology In Vitro Techniques medicine.disease_cause Autoantigens Autoimmunity 03 medical and health sciences 0302 clinical medicine Rheumatology Heart Conduction System Internal medicine RNA Small Cytoplasmic Medicine Humans Lupus Erythematosus Systemic Neonatal lupus erythematosus 030203 arthritis & rheumatology business.industry Autoantibody Infant Newborn medicine.disease Precipitin Precipitin Tests In vitro Endocrinology Heart Block Ribonucleoproteins Antibodies Antinuclear Antirheumatic Agents Female business Anti-SSA/Ro autoantibodies |
| Zdroj: | Lupus. 7(3) |
| ISSN: | 0961-2033 |
| Popis: | The ability of affinity purified anti-52 kDa Ro/SSA antibody from patients without obstetric history of neonatal lupus to cause heart block using an experimental model was investigated. IgG-enriched fractions from sera of 20 systemic lupus erythematosus (SLE) and one Sjögren's syndrome (SS) all positives for anti-Ro/SSA antibodies as detected by CIE, were perfused on isolated whole rabbit hearts. Only six (29%) samples induced A-V block, five of them presenting low anti-Ro/SSA titre. All of them recognized the 52 kDa isoform on ELISA whereas only one had a concomitant binding to the 60 kDa protein. Moreover, affinity purified antibodies from two sera previously known to induce A-V block were obtained by affinity chromatography using a column containing the full-length 52 kDa Ro/SSA fusion protein. Paired eluate and effluent devoid of anti-52 kDa activity from the same patient were individually perfused in whole hearts. The ability to cause cardiac blockade was restricted to the affinity anti-52 kDa eluates. In addition, anti-52 kDa eluates from three IgG fractions that primarily failed to induce blockade remained ineffective. The present study has added to our knowledge that affinity anti-52 kDa Ro/SSA antibodies from mothers with healthy infants are capable of causing in vitro cardiac conduction disturbances. A prospective follow up of these patients will better delineate the clinical usefulness of this experimental model. |
| Databáze: | OpenAIRE |
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