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  • Title: [Monoclonal antibodies directed against the beta hCG subunit and against a synthetic peptide analog of the carboxyl-terminal end. Clinical use in vivo and in vitro].
    Author: Bellet D, Ozturk M, Bidart JM, Strugo MC, Troalen F, Caillaud JM, Lumbroso J, Jolivet M, Tartar A, Amiel JL.
    Journal: Ann Endocrinol (Paris); 1984; 45(4-5):335-41. PubMed ID: 6085542.
    Abstract:
    In order to detect specifically the beta-hCG, we have produced monoclonal antibodies (Mabs), using as immunogens hCG, beta hCG or a totally synthetic molecule (109-145 peptide) analogous to the beta-subunit carboxyl terminus. 34 fusion experiments were performed and led to 8 Mabs which presented a high reactivity to 125I beta hCG in the screening test. Mab D1E8 was directed to the 1-115 region of beta hCG and was cross reactive with hLH (greater than 60%). Mabs 702, 1032, and 1211 were directed against three different epitopes located in the 109-145 region and were specific for the beta hCG. The in vivo localization of tumors containing beta hCG ty tomoscintigraphy (SPECT) was evaluated in 5 patients by injecting 131I-Mab D1E8, selected for imaging because of its high affinity to beta hCG (Ka = 1.9 X 10(9)). SPECT was performed 48 h and 96 h after injection: 2 patients with proven tumor sites had positive "immunoscintigraphy" results. One patient, simultaneously injected with 125I non-specific IgG, had a tumor resection: the count ratio between normal and tumoral tissues revealed a low specific uptake. Two and three-site immunoradiometric assays (IRMA) were performed with monoclonal antibodies purified from nude mice ascitic fluids. IRMA were based upon two or three Mabs, with D1E8 on a solid phase and 125I Mab 702 or a mixing of 125I-702 and 125I-1032 as tracer. The specificity of IRMA was demonstrated by the absence of binding with increasing amount of hLH, hFSH and hTSH up to 5000 ng/ml.(ABSTRACT TRUNCATED AT 250 WORDS)
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