Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0024141 (systemic lupus erythematosus)
 44,322 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The relative amounts of autoantibodies against defined nucleosomal proteins present in serums from patients with systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), and mixed connective tissue disease (MCTD) have been examined by an enzyme-linked immunoassay. Autoantibodies to nucleosomal proteins were detected in 45 percent of the patients with SLE, 18 percent of the MCTD patients, and none of the RA patients. The results suggest that, in SLE, antibodies are formed against a subset of nucleosomes which contain protein HMG-17.
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PMID:Autoantibodies to nucleosomal proteins: antibodies to HMG-17 in autoimmune diseases. 646 Mar 17

Autoantibodies to HMG-17, a non-histone nucleosomal protein, were found in systemic lupus erythematosus (SLE), mixed connective tissue disease (MCTD) and ANA positive pauciarticular juvenile rheumatoid arthritis (JRA), but not in rheumatoid arthritis (RA). Using highly purified HMG-17 derived from porcine thymus, we tested sera from 50 patients with scleroderma for antibodies to HMG-17 by enzyme-linked immunosorbent assay (ELISA). There were 16 patients with diffuse cutaneous systemic sclerosis (dSSc) and 34 with limited cutaneous systemic sclerosis (1SSc) with age at disease onset 40.25 +/- 11.68 and 39.94 +/- 15.68 years, respectively, and disease duration 6.03 +/- 4.98 and 13.34 +/- 11.80 years, respectively (P < 0.0001). Anticentromere antibodies (ACA) were found in 65% of 1SSc patients but not in dSSc (P < 0.0001) while the prevalence of antinuclear antibodies (ANA) with other than ACA patterns did not differ in the two groups. Anti-HMG-17 antibodies occurred in 20 patients (40%), five with dSSc (31%) and 15 with 1SSc (41%). Twelve of the 20 HMG-17 positive patients were also positive for ACA (60%) but this association was not significant. No association was found between anti-HMG-17 and other antibody patterns. In conclusion, anti-HMG-17 antibodies occur in one third of scleroderma patients, do not discriminate scleroderma variants and are not associated with other autoantibodies.
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PMID:Autoantibodies to HMG-17 nucleosomal protein in patients with scleroderma. 803 38

HLA class II alleles (DNA typing) and antibodies to HMG-1,2,14,17 proteins and H1 histone were determined in three predominantly Caucasian groups of patients with pulmonary hypertension (PHT). Forty-four adults had primary pulmonary hypertension (PPH), 42 children had PPH, and 41 children had PHT associated with anatomically large congenital pulmonary to systemic shunts (PHT + shunt). The HLA class II alleles in the Caucasian patients were compared with those of 51 healthy Caucasian controls. Eight (18%) of 44 sera from adults with PPH bound HMG-14 and 23 (52%) bound H1. None of 42 sera from children with PPH bound either HMG-14/17 or HMG-1/2, whereas four (10%) bound H1. In the PHT + shunt group of 41 children, two (5%) bound HMG-14, one (3%) bound HMG-17, four (10%) bound HMG-1 and/or HMG-2, and six (15%) bound H1. Among the 12 HMG antibody-positive patients, HLA-DQ6 was present in nine of 10 HLA typed patients (six PPH adults and three PHT + shunt children), seven of whom had antibodies to HMG-14 and one to HMG-17. The 100% frequency of HLA-DQ6 in seven Caucasian patients with antibodies to HMG-14/17 was statistically significant when compared with the 41% frequency of -DQ6 present in 51 healthy Caucasian controls (pc = 0.027, pc = Bonferroni correction, OR = 21.3). In contrast, when compared with controls, 25 patients with PPH and anti-H1 antibodies (21 adults and four children) had increased frequencies of HLA-DQ7 and -DR5 (60% versus 29%, P = 0.010, OR = 3.6 and 48% versus 22%, P = 0.018, OR = 3.4), which were not significant after correction. In essence, antibodies to HMG-14 and to H1 proteins were present predominantly in adults with PPH, suggesting that the pattern of response to HMG-14/17 was similar to that previously reported in systemic lupus erythematosus (SLE) and drug-induced autoimmunity. This is the first report of an association between autoantibodies directed against HMG and H1 with immunogenetic markers. These data suggest that a subset of patients with PPH may have an autoimmune disease.
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PMID:Primary pulmonary hypertension: immunogenetic response to high-mobility group (HMG) proteins and histone. 891 89

HMG-17 is a nucleosomal protein which is an immune target of autoantibodies in systemic lupus erythematosus (SLE) and other autoimmune diseases. Autoantibody production in SLE is believed to result from autoantigen specific immune stimulation and subsequently, it is expected that antigenic determinants recognized by SLE autoantibodies and induced antibodies by immunization are quite similar. To examine this issue, rabbits were immunized with purified HMG-17. The produced antiserum showed cross reactivity on blots and in inhibition ELISA with histone H1, even after its affinity purification with immobilized HMG-17. Finally, purification of the antiserum over H1 absorbed on nitrocellulose membrane produced specific anti-HMG-17 antibodies in the supernatant and anti-HMG-17/H1 antibodies that were bound to H1. SLE sera positive for HMG-17 had also cross reactivity with H1, and following the same procedure as before we received HMG-17 specific SLE autoantibodies and anti-HMG-17/H1 autoantibodies. Using the multipin epitope mapping technology, 19 overlapping 15-mer HMG-17 peptides and six 15-peptides, corresponding to known epitopes of histone H1, were synthesized. Four major epitopes were identified on the HMG-17 molecule, reactive with induced anti-HMG-17 antibodies, and these were the same as major autoepitopes In SLE. The sequence 25-51 of HMG-17, part of its DNA-binding domain, was recognized by the anti-HMG-17/H1 antibodies that were bound to H1. These antibodies recognized also defined epitopes of H1. Our results show that SLE autoantibodies can be directed against the same or similar epitopes as do IgGs evoked during the active immunization of animals, and provide additional evidence that autosensitization with an autoantigen might be operative. The possibility that the same or similar epitopes are found on different molecules (in this study HMG-17 and H1) supports the fact that there are rules by which nature selects the most dominant immunodeterminant to a given protein, which often represents functional or structural sites in the autoantigen.
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PMID:Rabbit anti-HMG-17 antibodies recognize similar epitopes on the HMG-17 molecule as lupus autoantibodies. Relation with histone H1 defined epitopes. 1252 45