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R S Brown, L P Kertiles, R E Kleinmann, Choice of immunoglobulin G purification method in assays for antibodies to the thyrotropin receptor., Clinical Chemistry, Volume 32, Issue 11, 1 November 1986, Pages 2034–2039, https://doi.org/10.1093/clinchem/32.11.2034
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Abstract
Activity of autoantibodies to the thyrotropin receptor in the serum of patients with active Graves's disease was compared when the patients' IgG was purified by three different procedures: ammonium sulfate precipitation (I), a modified batch diethylaminoethyl cellulose method (II), and affinity chromatography on Protein A-Sepharose CL-4B (III). IgG extracted by I was significantly less potent in inhibiting binding of 125I-labeled thyroid membranes than that prepared by either II or III, and was significantly less effective than II in stimulating adenyl cyclase activity in thyroid membrane. Thyroglobulin, a serum protein whose concentration is increased in patients with various thyroid diseases, was coprecipitated in amounts sufficient to significantly inhibit binding only when method I was used, but not with either of the other two procedures. Evidently method I is inferior to either of the other two when used for purification of autoantibodies to the thyrotropin receptor. Method II used in this study, being faster and more economical than I and of equivalent efficacy, is a feasible alternative method for clinical use.