A monoclonal anti-human IL-6 receptor antibody inhibits the proliferation of human myeloma cells.
A monoclonal antibody (UV4) against the human IL-6 receptor (hIL-6R) was generated by immunizing BALB/c mice with both a human myeloma cell line (U266) and a murine cell line (M12.4/R) transfected with the hIL-6R cDNA. Flow cytometric analysis demonstrated that UV 4 stains the hIL-6R+ cell lines U266 and U937, but not the hIL-6R- cell lines Daudi and K562. Competitive inhibition assays demonstrated that preincubation of U266 cells with UV4 inhibited the binding of a phycoerythrin (PE)-IL-6 conjugate to the hIL-6R and also inhibited the proliferative activity of IL-6 on the IL-6-dependent human myeloma cell lines ILKM2 and ILKM3. In contrast, UV4 did not interfere with the proliferation of the hIL-6R- Burkitt's lymphoma cell line, Daudi. Direct sandwich radioimmunoassays further confirmed that the UV4 bound to the same molecule as the goat anti-hIL-6R antibody. These results suggest that both UV4 and human IL-6 bind to the same or adjacent epitopes on the hIL-6R. This monoclonal antibody should facilitate studies of the structure-function relationship of IL-6R and may be useful for the treatment of IL-6-dependent diseases such as multiple myeloma.
Huang
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YW
Department of Microbiology, University of Texas Southwestern Medical Center at Dallas 75235.
Vitetta
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D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000494:pharmacology*; D000918:Antibody Specificity; D001667:Binding, Competitive; D002455:Cell Division; D003001:Cloning, Molecular; D006041:Goats; D006801:Humans; D015850:Interleukin-6 / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D009101:Multiple Myeloma / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D018123:Receptors, Interleukin / Q000037:antagonists & inhibitors / Q000235:genetics / Q000276:immunology*; D019947:Receptors, Interleukin-6; D014162:Transfection; D014407:Tumor Cells, Cultured / Q000276:immunology / Q000378:metabolism / Q000473:pathology
D000911:Antibodies, Monoclonal; D015850:Interleukin-6; D018123:Receptors, Interleukin; D019947:Receptors, Interleukin-6