Glycoconjugate Journal

, Volume 14, Issue 1, pp 97–105 | Cite as

Natural human anti-Galα(1,3)Gal antibodies react with human mucin peptides

  • Mauro S Sandrin
  • Hilary A Vaughan
  • Pei-Xiang Xing
  • Ian F.C McKenzie


We have recently demonstrated that both antibodies to Galα(1,3)Gal, and the Galα(1,3)Gal binding lectin (IB4), bind a synthetic peptide (DAHWESWL), there being a similar recognition of carbohydrate and peptide structures. We now report that the anti-Galα(1,3)Gal antibodies and IB4 lectin also react with peptides encoded by mucin genes (MUC 1, 3, 4)-sequences known to be rich in serine, threonine and proline. This activity was demonstrated (1) by the ability of mucin derived peptides to block the reaction of anti-Galα(1,3)Gal antibodies and IB4 lectin with a Galα(1,3)Gal+ pig endothelial cell line; the reactions were specific and did not occur with a random peptide containing the same sequences or with other mucin peptides; (2) by the fact that anti-mucin1 antibodies could react with the Galα(1,3)Gal expressed after transfection of COS cells (Galα(1,3)Gal-, Muc1-) with cDNA encoding the pig α,3galactosyltransferase; and (3) that the IB4 lectin and anti-Galα(1,3)Gal antibodies could react with mucin 1 found on the surface of human breast cancer cells. Thus natural occurring anti-Galα(1,3)Gal antibodies found in all human serum can react with self (Muc1) peptides expressed in large amounts on the surface of tumour cells but not on normal cells. The findings are of interest and serve to explain the previously reported findings that human cells can, at times, express Galα(1,3)Gal; such expression is an artefact, the reaction is due to the phenomenon described herein, i.e. that anti-Galα(1,3)Gal antibodies react with mucin peptides. Abbreviations: HPLC, high performance liquid phase chromatography; HRP, horse radish peroxidase; mAb, monoclonal antibody; NHS, normal human serum; PBS, phosphate buffered saline; VNTR, variable number of tandem repeats

natural antibodies Galα(1,3)Gal mucins MUC1 peptides 


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Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • Mauro S Sandrin
    • 1
  • Hilary A Vaughan
  • Pei-Xiang Xing
  • Ian F.C McKenzie
  1. 1.Austin Research InstituteAustin & Repatriation Medical CentreHeidelbergAustralia

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