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- W2036135280 abstract "Abstract Sera from 562 patients with IgG, IgA, IgM, IgD or IgE M-components or diffuse hypergammaglobulinemia and from 100 healthy individuals were tested for antibody activity against many or all of 115 different antigens. In low ionic strength buffer ( μ = 0·025), 99 sera (17·8%) had precipitating activity detectable by immunodiffusion against hapten-protein conjugates. DNA, bacterial antigens, carbohydrates, heparin, and phospholipids. Two normal sera gave weak precipitin reactions with nitrophenyl-protein conjugates. In high ionic strength buffer ( μ = 0·2) only 9 of the precipitating sera with M-components, and none of the others, gave strongly positive precipitin reactions with nitrophenyl-protein conjugates, pneumococcal polysaccharides, gums, heparin, cardiolipin, DNA, and nucleoprotein conjugates. M-components from 8 of the 9 precipitating sera, 4 IgG's and 4 IgM's, were purified and their peptic fragments prepared. Two IgG's and two IgM's and their divalent peptic fragments precipitated with DNP- and TNP-BGG when tested by immunodiffusion and quantitative precipitin analysis in high ionic strength buffers. The precipitin curves resembled those observed in conventional antige-antibody systems. They showed weak interaction with various nitrophenyl haptens when tested by hapten inhibition, passive hemagglutination and latex agglutination, modified Farr analyses, equilibrium dialysis, difference spectroscopy, and fluorescence quenching techniques. The low K A values, 10 3 M −1 , as determined by Farr analysis and equilibrium dialysis using DNP- and TNP-haptens were consistent with the weak quantitative precipitin and agglutination results. One IgG and one IgM M-component reacted with low and high mol. wt heparins and heparin derivatives showing typical quantitative precipitin curves, but not with other mucopolysaccharides. The strongest reaction was obtained with high mol. wt heparin. This activity was abolished when the amino-sulphate groups were removed from the heparins. Another IgM M-component had antibody-like activity against cardiolipin. Another IgG M-component reacted with bacterial antigens (pneumococcal SI, III, VIII and X) and related substances (gums karaya and myrrh). The reaction could be inhibited with d -glucuronic acid (10 −3 M ), d -galacturonic acid (10 −2 M ), and l -rhamnose (10 −1 M )." @default.
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- W2036135280 date "1976-03-01" @default.
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- W2036135280 title "Human monoclonal immunoglobulins with antibody-like activity" @default.
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- W2036135280 doi "https://doi.org/10.1016/0019-2791(76)90215-9" @default.
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