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  • Title: Production and characterization of human hybridoma monoclonal anti-Sm and anti-U1RNP antibodies spontaneously produced from normal human lymphocytes.
    Author: Carruthers CJ, Bell DA.
    Journal: J Autoimmun; 1992 Aug; 5(4):527-44. PubMed ID: 1418291.
    Abstract:
    A panel of human:human hybridomas secreting monoclonal anti-Sm/RNP antibodies was established by the fusion of normal human tonsillar lymphocytes to the lymphoblastoid B cell line GM4672. The specificity of these antibodies was studied by direct binding and competitive inhibition in enzyme linked immunosorbent assays (ELISAs), and by immunoblotting. The stable subclones of these hybridoma monoclonal anti-Sm/RNP antibodies could be classified into four groups according to ELISA. Group I bound Sm/RNP only, group II bound Sm-RNP, Ro/SS-A and La/SS-B, group III bound Sm/RNP and ssDNA, and group IV bound Sm/RNP, Ro/SS-A, La/SS-B and ssDNA. When antibodies from each of the groups were tested by immunoblotting, the following pattern of reactivity emerged. Group II and IV antibodies reacted with U1RNP-A, Sm-B'/B, Sm-D and Sm-E proteins, as well as the Ro/SS-A and La/SS-B proteins. In contrast, group I and III antibodies did not bind to any individual protein components of Sm/RNP,Ro/SS-A or La/SS-B antigens, but recognized their conformational epitopes. These results, therefore, directly demonstrate for the first time that normal-derived B cells have the genetic potential, revealed here by somatic cell hybridization, to produce anti-Sm/RNP antibody responses which are ordinarily only associated with systemic lupus erythematosus (SLE) and related connective tissue diseases.
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