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)

In the preceding companion article in this issue, an optical dye and a nitroxide radical were combined in a new dual function probe, 5-SLE. In this report, it is demonstrated that time-resolved optical anisotropy and electron paramagnetic resonance (EPR) data can be combined in a single analysis to measure rotational dynamics. Rigid-limit and rotational diffusion models for simulating nitroxide EPR data have been incorporated into a general non-linear least-squares procedure based on the Marquardt-Levenberg algorithm. Simultaneous fits to simulated time-resolved fluorescence anisotropy and linear EPR data, together with simultaneous fits to experimental time-resolved phosphorescence anisotropy decays and saturation transfer EPR (ST-EPR) spectra of 5-SLE noncovalently bound to bovine serum albumin (BSA) have been performed. These results demonstrate that data from optical and EPR experiments can be combined and globally fit to a single dynamic model.
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PMID:Measurement of rotational dynamics by the simultaneous nonlinear analysis of optical and EPR data. 768 52

Intravenous immune globulin (IVIg) has been advocated as efficacious therapy for a variety of disorders including idiopathic thrombocytopenic purpura and Kawasaki disease. Several reports have also documented the effectiveness of IVIg in systemic lupus erythematosus (SLE). Two patients with symptomatic SLE and ESRD were treated with IVIg. Both patients tolerated IVIg administration well and demonstrated clinical and serologic improvement. Both individuals also experienced a transient decline in serum albumin concentration with IVIg treatment. The mechanisms by which IVIg might have effected improvement in these patients are varied and are likely related to the immunomodulatory actions of IVIg. The reversible change in albumin concentration seen in these individuals may be secondary to abrupt alterations in oncotic homeostasis. Despite this unusual effect, the documented improvement in these patients suggests that IVIg therapy may be of benefit in patients with active SLE and ESRD. Further studies are warranted to examine the mechanisms by which IVIg may exert its therapeutic effect.
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PMID:Intravenous immune globulin in the treatment of patients with systemic lupus erythematosus and end-stage renal disease. 778 41

An enzyme immunoassay (EIA) was developed for measurement of complement-mediated solubilization of immune complexes. Preformed complexes consisting of horseradish peroxidase (Pe) and anti-Pe antibodies were incubated in diluted serum. After centrifugation the soluble complexes in the supernatant were quantitated by adding peroxidase substrate followed by measurement of absorbance. Kinetic analysis of revealed significant difference between normal and EDTA-treated serum similarly to a standard assay utilising immune complexes containing radiolabelled bovine serum albumin. The difference was most pronounced after incubation of immune complexes with serum for 40 minutes. Immune complex solubilization measured by EIA was reduced in sera from 10 patients with active systemic lupus erythematosus (SLE). In serially followed patients, flares of SLE were preceded by reduction of solubilization capacity. The EIA is a simple method for determining serum capacity to solubilize preformed immune complexes and might be considered as a routine test for assessment of complement function in diseases such as SLE.
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PMID:A simple enzyme immunoassay for measurement of immune complex solubilization utilizing preformed peroxidase-antiperoxidase complexes. 783 44

To investigate the role of antigen drive in anti-double-stranded (ds) DNA production, the antibody response induced in lupus-prone NZB/NZW mice by E. coli (EC) dsDNA was evaluated. Preautoimmune NZB/NZW female mice were immunized with complexes of EC dsDNA with methylated bovine serum albumin (mBSA) in complete Freund's adjuvant; control mice received either mBSA complexes with calf thymus (CT) dsDNA or mBSA alone in adjuvant. IgG antibody responses were assessed by ELISA. Similar to normal mice, immunized NZB/NZW mice produced significant levels of anti-dsDNA when measured with EC dsDNA as antigen. Whereas normal mice produce antibodies which are specific for the immunizing bacterial DNA, NZB/NZW mice produced antibodies that bound crossreactively to CT dsDNA by ELISA. Furthermore, the induced antibodies resembled lupus anti-DNA in their fine specificity for polynucleotide antigens and reactivity with Crithidia luciliae DNA. Despite their response to EC dsDNA, NZB/NZW mice immunized with CT dsDNA failed to generate significant anti-dsDNA responses. These results provide further evidence for the enhanced immunogenicity of bacterial DNA and suggest that immune cell abnormalities in NZB/NZW mice promote the generation of crossreactive autoantibody responses when confronted with a foreign DNA.
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PMID:Induction of cross-reactive anti-dsDNA antibodies in preautoimmune NZB/NZW mice by immunization with bacterial DNA. 788 86

Epidemiological and experimental evidence suggested that denial of dietary cow milk protein early in life protects genetically susceptible children and animals from insulin-dependent diabetes (IDDM). Bovine serum albumin (BSA) was proposed as a candidate milk-borne mimicry antigen responsible for the diabetogenic cow milk effect. Elevated anti-BSA antibodies have been observed in patients and diabetic rodents, and these antibodies precipitate p69 from islet cell lysates. IDDM is a T cell mediated disorder but efforts to detect BSA-specific T cells in diabetic children have so far failed. We describe here a culture system which allowed the detection of BSA-specific T cells and we mapped this response to the ABBOS peptide (pre-BSA position 152-169) previously identified as a possible mimicry epitope. ABBOS-sensitized T cells were found in 28/31 children with recent onset IDDM but not in non-diabetic controls nor in children with SLE or JRA. T cell proliferative responses declined within the first few years of diabetes diagnosis. Although no effector cell role for BSA/ABBOS specific T lymphocytes has been demonstrated, the presence of BSA peptide-specific T cells strengthens the postulated link between a cow milk protein and IDDM.
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PMID:T cells from children with IDDM are sensitized to bovine serum albumin. 799 51

We describe an ELISA for serum IgG antibodies against malondialdehyde-modified low-density lipoprotein (mLDL). Optimal antigen concentration, serum dilution, and dilution of enzyme-conjugated second antibody were 25 mg/L, 1:250, and 1:5000, respectively, when 5 g/L human serum albumin was used for blocking. When data were expressed as mLDL/LDL (the ratio of IgG binding to mLDL vs LDL), within-run and between-run CVs were 7.0% and 8.9%, respectively. Antibody concentrations expressed as mLDL/LDL or as mLDL-LDL (the difference between IgG binding to mLDL and to LDL) were higher in women with systemic lupus erythematosus (n = 20) than in controls (n = 20) (P < 0.001). With bovine serum albumin or Superblock blocking buffers, only the mLDL-LDL data were significant. Thus, the choice of blocking agent and the method of data expression should be carefully considered when assaying IgG antibodies against mLDL.
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PMID:ELISA of IgG antibody to oxidized low-density lipoprotein: effects of blocking buffer and method of data expression. 808 82

A 26-year old woman, who was diagnosed as having systemic lupus erythematosus at the age of 23 year old, presented diarrhea and headache. She showed severe hypoproteinemia (serum total protein 3.7 g/dl, serum albumin 1.4 g/dl) and hyperlipidemia. She revealed to have protein-losing enteropathy with the result of alpha-1-antitrypsin clearance test using stool. Increase of prednisolone improved the loss of albumin into the bowel and abnormal laboratory findings. She also showed watershed infarction in the area of middle cerebral artery and posterior cerebral artery. Protein-losing enteropathy is a rare complication of SLE, only 18 cases are available on literature. No case is found to have cerebral infarction in patients with protein-losing enteropathy associated with SLE. It is known that blood levels of anticoagulation factors decrease in protein-losing enteropathy due to the leakage of plasma protein into intestinal lumen. Serum antithrombin III was decreased in this case. Hyperlipidemia found in this case seems to be caused by same mechanism in nephrotic syndrome. Lupus anticoagulant was also positive in this patient. These factors seems to be related to the occurrence of cerebral infarction. This case suggests the possibility of cerebral infarction in patients with protein-losing enteropathy in SLE.
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PMID:[Protein-losing enteropathy and cerebral infarction associated with systemic lupus erythematosus]. 814 30

Renal artery infarction is a very rare complication in patients with systemic lupus erythematosus (SLE), even in patients with antiphospholipid syndrome which often causes thromboembolism: Renal infarctions have only been reported in 4 SLE patients with antiphospholipid antibodies (aPL). Here we report a case of SLE without aPL who accompanied by renal and cerebral infarctions. A 42-year old Japanese woman with 8 year history of SLE manifested by arthralgia, central nervous system symptoms, positive-antinuclear and anti-DNA antibodies was admitted to our hospital for the treatment of progressive lupus nephritis. Physical examinations revealed hypertension (130-160/80-110 mmHg) without pitting pretibial edema. Laboratory evaluations showed proteinuria (3.7 g/day), normal serum creatinine level (0.9 mg/dl), low serum albumin level (2.3 g/dl) and high cholesterol level (317 mg/dl). Old cerebral infarctions were recognized by magnetic resonance imaging. However, hematological and immunological studies revealed that this case has neither a prolonged activated partial thromboplastin time, lupus anticoagulant nor anticardiolipin antibodies. Prednisolone was increased from 30 mg/every other day to 30 mg/day, and oral azathioprine, 50 mg/day, was started for the treatment of lupus nephritis. On the 11th day, she suddenly complained severe abdominal pain, which gradually localized on the right side. Computed tomography of the kidney suggested right renal infarctions, and arteriography of right renal artery confirmed both an obstruction of the ventral branch and a narrowing of the dorsal branch of right renal artery. No intra-cardiac thrombus was demonstrated by echocardiography. Following to the treatment with fibrinolytic agent and anticoagulant, her symptoms have improved.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[Renal and cerebral infarctions in a patient with systemic lupus erythematosus without antiphospholipid antibodies]. 823 16

Procainamide (PA) is the drug most commonly associated with the induction of autoantibodies and drug-related lupus (DRL). While the majority of these patients express autoantibodies, antibodies to the parent drug and metabolites, PA-hydroxylamine (PAHA) or nitroso-PA (NOPA), have not been reported in humans. Hapten-carrier conjugates were prepared using human hemoglobin (HgB) or autologous rabbit erythrocytes with PAHA or NOPA. PA was conjugated to rabbit serum albumin (RSA) or egg albumin (OVA) via diazotization and condensation methods. Rabbits were immunized with hapten conjugates in Freund's adjuvant. These hapten-carrier compounds (5-10 micrograms/ml) were used as test antigens for antibodies in sera from the rabbits and 40 patients on chronic PA treatment. 10 SLE patients, 33 elderly and 20 young normal controls by ELISA. Type I and II collagens were also used as test antigens for human sera. Sera from rabbits immunized with the PA compounds had elevated IgG antibody values to PA, PAHA and NOPA, but no autoantibodies. Absorption of the rabbit sera with the PA compounds reduced the antibody levels; ssDNA and histones failed to inhibit the total binding values. Mean binding to PA-OVA was 0.95 +/- 0.41 for PA patients and 1.37 +/- 0.26 standard error of means (S.E.M.) in the SLE patients compared to 0.37 +/- 0.14 S.E.M. in the normal sera (P < or = 0.05); similar binding values to PAHA-HgB and NOPA-HgB were also observed. Sixty-eight percent of the PA patients had antibodies to type II collagen. Elevated binding values to PA compounds were inhibited by absorption of human sera with ssDNA or total histones; absorption with PA or PAHA had no significant effect. These findings suggest that sera from PA patients containing high titers of autoantibodies cross-react in vitro with unrelated antigens.
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PMID:Study of procainamide hapten-specific antibodies in rabbits and humans. 825 39

Immunization of normal mice with bacterial DNA elicits a significant IgG anti-DNA response and has been explored as a model of systemic lupus erythematosus. To determine whether this induced response is influenced by sex, we have measured anti-DNA levels in normal male and female BALB/c mice immunized with single stranded DNA from E. coli as complexes with methylated bovine serum albumin (mBSA) in adjuvant. By ELISA assays, anti-DNA levels of immunized females were approximately 16-fold higher than those of immunized males; levels of antibodies to the mBSA carrier were similar, however. The antibodies from females and males showed a similar degree of cross-reactivity when assayed using other natural and synthetic DNA antigens, including mammalian DNA. These findings suggest the potentiation of anti-DNA production in females by antigen-specific mechanisms and provide further evidence that immunization with bacterial DNA replicates features of autoantibody production in SLE.
Lupus 1993 Aug
PMID:Effect of sex on the induction of anti-DNA antibodies in normal mice immunized with bacterial DNA. 826 73


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