PubMed Health⌕ Search

Biomedical subjects

M I Hamburger

Publications and source records attributed to M I Hamburger.

5 recordsLinked to original sources
PubMed1979

Defective reticuloendothelial system Fc-receptor function in systemic lupus erythematosus.

To determine whether reticuloendothelial-system immunospecific Fc-receptor function is abnormal in patients with systemic lupus erythematosus, we studied the clearance of IgG-sensitized 51Cr-labeled erythrocytes by these splenic macrophage membrane receptors in 15 untreated patients. Fc-specific clearance rates were strikingly abnormal in 13 of 15 patients (half-times ranging from 80 to 2256 minutes, P less than 0.001 as compared to controls). Abnormal clearances correlated with immune-complex levels (as measured by the C1q-binding assay) and with disease activity. C1q-binding activity and anti-DNA titers also correlated with disease activity. The correlations of C3, C4, CH50 and factor B with abnormal clearance and disease activity were weaker or nonexistent. The significant correlations among clearance, disease activity and C1q-binding activity suggest that the defect in Fc-receptor function may lead to the prolonged circulation of immune complexes, thereby contributing to tissue deposition and damage.

Adult↗
PubMed1979

Sjögren's syndrome: a defect in reticuloendothelial system Fc-receptor-specific clearance.

To determine the functional status of reticuloendothelial system Fc receptors in patients with Sjögren's syndrome, we studied the rate of clearance from the circulation of 51Cr-labeled IgG-sensitized autologous erythrocytes in 19 patients. Fc-receptor-mediated clearance was abnormal in 12 of the 19 patients, with half-lives ranging from 80 to 356 min. There was a significant correlation between clearance rates and clinical manifestations of disease. Clearance rates tended to be normal in patients with disease limited to exocrine glands and abnormal in patients with widespread disease. In contrast, there were no correlations between the rate of clearance of IgG-sensitized erythrocytes and serum immune complex levels, serum complement component levels, or rheumatoid factor titers. The striking correlation between clearance rates and disease manifestations suggests that decreased clearance of immune complexes by defective reticuloendothelial system Fc receptors may contribute to disease pathogenesis.

Adult↗