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Specificity of the IgG Response in Mice and Human Breast Cancer Patients Following Immunization Against Synthetic Sialyl-Tn, An Epitope with Possible Functional Significance in Metastasis

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Book cover Antigen and Antibody Molecular Engineering in Breast Cancer Diagnosis and Treatment

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 353))

Abstract

Several investigators have shown that the expression of the sialyl-Tn (STn) epitope on cancer associated mucins is associated with a poor prognosis in several human cancers suggesting that STn may have functional significance in metastasis. We postulate that antibodies against the STn-epitope can inhibit metastasis. We generated a synthetic “mimic”, NANAα(2-6)GalNAcα-O-Crotyl (STn-crotyl), of the natural O-linked epitope on mucins, NANAα(2-6)GalNAcα-O-Serine (STn-serine). STn-crotyl was conjugated to the carrier protein KLH through the crotyl linker arm and a “vaccine” containing STn-KLH plus Detox™ adjuvant was formulated. The immunogenicity of the vaccine was evaluated in BALB/c mice and in metastatic breast cancer patients. The specificity and titres of IgG antibodies were evaluated by ELISA on ovine submaxillary mucin (OSM) solid phases. OSM is a convenient source of repeating, natural O-linked STn-serine structures. Mice immunized three times with as little as 0.25 μg of STn-KLH produced a median IgG titre of over 1: 5000 on solid phase OSM. Anti-OSM IgG monoclonal antibodies generated from these mice were completely inhibited in their binding to solid phase OSM equally well by STn-serine and STn-crotyl synthetic haptens but not by several other closely related synthetic haptens.

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© 1994 Springer Science+Business Media New York

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Longenecker, B.M., Reddish, M., Koganty, R., MacLean, G.D. (1994). Specificity of the IgG Response in Mice and Human Breast Cancer Patients Following Immunization Against Synthetic Sialyl-Tn, An Epitope with Possible Functional Significance in Metastasis. In: Ceriani, R.L. (eds) Antigen and Antibody Molecular Engineering in Breast Cancer Diagnosis and Treatment. Advances in Experimental Medicine and Biology, vol 353. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2443-4_11

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  • DOI: https://doi.org/10.1007/978-1-4615-2443-4_11

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4613-6038-4

  • Online ISBN: 978-1-4615-2443-4

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