Search PubMed⌕ Search

Biomedical subjects

J B Winfield

Publications and source records attributed to J B Winfield.

105 records · Page 6Linked to original sources
PubMedDate not supplied

Nature of cold-reactive antibodies to lymphocyte surface determinants in systemic lupus erythematosus.

Antilymphocyte antibodies in serum from patients with systemic lupus erythematosus (SLE), as detected by microcytotoxicity and indirect immunofluorescence, were predominantly cold reactive and of the IgM class. These IgM antibodies were most active at 4 degrees C. IgG antibodies were infrequent, and were only minimally lymphocytotoxic. Most sera were cytotoxic for autologous lymphocytes and were equally reactive with normal and SLE lymphocytes, as well as with B- and T-cell preparations. Separate T- and B-cell specificities, which appeared not to be related to HL-A determinants, were identified by differential absorption experiments. The functional significance of these antilymphocyte antibodies is discussed.

Animals↗
PubMedDate not supplied

Development of antibodies to ribonucleoprotein following short-term therapy with procainamide.

An autoimmune response to certain nuclear antigens frequently develops in patients receiving prolonged therapy with procainamide. In order to define events involved in the initiation of this immune response, patients with myocardial infarction were studied early after starting procainamide and at later times. Polynucleotide antibodies and circulating polynucleotide antigens were sought by sensitive assay techniques in the sera of these patients. Very high titers of antiribonucleoprotein developed selectively in the majority of these patients after short-term therapy with procainamide. Such antibodies were infrequent in the long-term therapy group, most of whose members exhibited anti-single-strand DNA and were symptomatic with overt procainamide-induced lupus. Patients with acute myocardial infarction who did not receive procainamide did not develop anti-polynucleotide antibodies, but rather had high levels of free ribonucleoprotein antigen in their serum. Various interpretations of these data are discussed.

Aged↗
PubMedDate not supplied

Association of cold-reactive antilymphocyte antibodies with lymphopenia in systemic lupus erythematosus.

In a prospective study 26 of 29 patients with systemic lupus erythematosus had cold-reactive antilymphocyte antibodies cytotoxic for autologous lymphocytes and lymphocytes from normal subjects. The level of antilymphocyte antibodies was highly correlated, by linear regression analysis, with lymphopenia in these patients. The data suggested that both the avidity and the concentration of these antibodies were important determinants in this relationship. A clear association between increased antilymphocyte antibody activity and exacerbation of SLE was demonstrated. Apart from lymphopenia, however, neither type of clinical manifestation nor any particular serologic abnormality appeared to be related to the presence of antilymphocyte antibodies.

Antibodies↗
PubMedDate not supplied

Immunologic observations on 9 sets of twins either concordant or discordant for SLE.

The influence of genetic and nongenetic factors on abnormalities of the immune response in systemic lupus erythematosus (SLE) was studied in 9 sets of twins in which one or both twins had SLE. Particular emphasis was placed on contrasting the results between the sibs of 3 monozygotic pairs discordant for clinical SLE. Depression of cell-mediated immunity, determined by lymphocyte blastogenic response to mitogens, was associated with the clinical expression of illness. In contrast, autoreactive antilymphocyte antibodies and lymphocyte tubuloreticular structures were found in both clinically affected and unaffected subjects and were more prominently associated with the presence of other serologic abnormalities. No evidence of antigens or cell surfaces determinants unique to affected sibs was encountered.

Adult↗
PubMedDate not supplied

Antibodies to dAT detected by membrane filtration.

Sera from patients with active systemic lupus erythematosus caused the retention of the radioactively labeled synthetic polynucleotide 14C-dAT on cellulose nitrate filters. The amount of 14C-dAT bound correlated with the presence of hypocomplementemia and active renal disease. Sera containing only anti-single-stranded DNA antibodies did not bind 14C-dAT but did bind 125I DNA from E coli that had been prefiltered to remove ssDNA contamination. Inhibition experiments also indicated the presence of antigenic differences between 14C-dAT and prefiltered 125I-E coli DNA. The data suggest that dAT carries one of the major antigenic specificities for antinative DNA antibodies in SLE, and that cellulose nitrate filtration fails to remove a significant proportion of contaminating single-stranded DNA determinants in non-synthetic DNA.

Antibodies, Antinuclear↗
PubMedDate not supplied

Direct evidence for circulating DNA/anti-DNA complexes in systemic lupus erythematosus.

Fifteen serum cryoprecipitates from 28 patients with systemic lupus erythematosus (SLE) contained DNA demonstrable by counterimmunoelectrophoresis after exhaustive digestion of cryoimmunoglobulin with pronase. The majority of these cryoprecipitates also exhibited increased DNA binding activity in a modified Farr assay. Both DNA and anti-DNA antibody were enriched in the cryoprecipitates relative to the supernatant serum level. These data provide direct evidence for the presence of DNA/anti-DNA complexes in the circulation of patients with SLE.

Antigen-Antibody Complex↗
PubMedDate not supplied

Neonatal experimental autoimmune myasthenia gravis.

Neonatal rats born of and nursed by mothers immunized with Torpedo acetylcholine receptor protein developed a defect of neuromuscular transmission as indicated by reduced miniature endplate potential amplitudes. It is likely that antibodies to the Torpedo receptor protein were passively transferred to the neonates in the milk. With the exception of the route of transfer, this neonatal form of experimental autoimmune myasthenia gravis appears to be similar to its human counterpart, and thus can serve as an experimental model.

Animals↗