PMID- 9434799 OWN - NLM STAT- MEDLINE DCOM- 19980205 LR - 20190822 IS - 0090-1229 (Print) IS - 0090-1229 (Linking) VI - 86 IP - 1 DP - 1998 Jan TI - Autoantibodies to a novel early endosome antigen 1. PG - 81-7 AB - Autoantibodies to EEA1, an antigen on early endosomes, were first reported in the serum of a patient with subacute cutaneous lupus erythematosus (SCLE). Here we have examined 38 sera selected for investigation of autoantibodies to EEA1 on the basis of cytoplasmic vesicle-like reactivity by immunofluorescence. Ten of the sera were reactive to a HeLa cell protein of approximately the same M(r) as human EEA1. Eight of these sera belonged to the IgG1 subclass. Five of the sera reacted with fusion proteins incorporating either the amino (from amino acids 1 to 209) or the carboxyl (incorporating the most C-terminal 300 amino acids) terminus of the human EEA1 protein. Antigens reactive with these 5 sera colocalized with internalized transferrin receptors, indicating their association with early endosomes. The other 5 sera which did not react to both fusion proteins did not colocalize with internalized transferrin receptors. We conclude that 5 of the 38 patients (13%) have autoantibodies to EEA1. None of these patients have SCLE, but have generalized joint pain, polyarthritis, rheumatoid arthritis, or circulating rheumatoid factors. FAU - Waite, R L AU - Waite RL AD - Department of Pathology and Immunology, Monash Medical School, Prahran, Victoria, Australia. FAU - Sentry, J W AU - Sentry JW FAU - Stenmark, H AU - Stenmark H FAU - Toh, B H AU - Toh BH LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Clin Immunol Immunopathol JT - Clinical immunology and immunopathology JID - 0356637 RN - 0 (Autoantibodies) RN - 0 (Biomarkers) RN - 0 (Immunoglobulin G) RN - 0 (Immunoglobulin M) RN - 0 (Membrane Proteins) RN - 0 (Receptors, Transferrin) RN - 0 (Recombinant Fusion Proteins) RN - 0 (Vesicular Transport Proteins) RN - 0 (early endosome antigen 1) RN - 9009-79-4 (Rheumatoid Factor) SB - IM MH - Aged MH - Aged, 80 and over MH - Antibody Specificity MH - Arthralgia/blood/immunology MH - Arthritis/blood/immunology MH - Arthritis, Rheumatoid/blood/immunology MH - Autoantibodies/blood/*immunology MH - Autoimmune Diseases/blood/*immunology MH - Biomarkers MH - Endosomes/*immunology MH - Enzyme-Linked Immunosorbent Assay MH - Female MH - Fluorescent Antibody Technique, Indirect MH - HeLa Cells MH - Humans MH - Immunoglobulin G/blood/immunology MH - Immunoglobulin M/blood/immunology MH - Joint Diseases/blood/*immunology MH - Male MH - Membrane Proteins/*immunology MH - Receptors, Transferrin/analysis MH - Recombinant Fusion Proteins/immunology MH - Rheumatoid Factor/analysis MH - Vesicular Transport Proteins EDAT- 1998/01/22 00:00 MHDA- 1998/01/22 00:01 CRDT- 1998/01/22 00:00 PHST- 1998/01/22 00:00 [pubmed] PHST- 1998/01/22 00:01 [medline] PHST- 1998/01/22 00:00 [entrez] AID - S009012299794455X [pii] AID - 10.1006/clin.1997.4455 [doi] PST - ppublish SO - Clin Immunol Immunopathol. 1998 Jan;86(1):81-7. doi: 10.1006/clin.1997.4455.