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- Title
Tissue-specific antibodies against the fibroblast insulin receptor in a patient with lupus nephritis and hypoglycemia.
- Authors
De Pirro, Roberto; Borboni, Patrizia; Lauro, Renato; Festa, Antonella; Testa, Ivano; De Martinis, Carlo; Maddux, Betty A.; Goldfine, Ira D.; De Pirro, R; Borboni, P; Lauro, R; Festa, A; Testa, I; De Martinis, C; Maddux, B A; Goldfine, I D
- Abstract
We recently reported that the serum from a patient with lupus nephritis, insulin resistance, and hypoglycemia contains multiple populations of antibodies directed at the human insulin receptor. In the present study, we found a subpopulation of antibodies (eluted from a protein A-Sepharose affinity column at pH 4.3) directed at the human fibroblast insulin receptor. When tested against human placental membranes, IM-9 lymphocytes, circulating monocytes and erythrocytes, and isolated adipocytes, the antibody subpopulation did not compete with 125I-insulin for binding to its receptor. In contrast, the antibody subpopulation competed with 125I-insulin for binding to the human fibroblast insulin receptor. This antibody subpopulation stimulated [3H]alpha-aminoisobutyric acid [( 3H]AIB) uptake to these cells. Unlike the effect of insulin, however, this regulation of transport was not antagonized by a mouse monoclonal antibody to the human insulin receptor that inhibits 125I-insulin binding. These studies indicate, therefore, that a tissue-specific antibody subpopulation can occur spontaneously in patients with antibodies to the human insulin receptor. Furthermore, they indicate the presence of anti-insulin receptor autoantibodies specifically directed against a tissue that is not primarily involved in glucose metabolism.
- Publication
Diabetes, 1985, Vol 34, Issue 11, p1088
- ISSN
0012-1797
- Publication type
journal article
- DOI
10.2337/diabetes.34.11.1088