Abstract
E-selectin ligand Sialyl-Lewis a (SA-Le(a)) carbohydrate is expressed on many carcinomas. Peptide mimicking SA-Le(a) (DLWDWVVGKPAG) was previously selected from a recombinant library by screening with monoclonal antibody (MAb) NS19-9. In this study, the residues critical for interaction with the NS19-9 were mapped using peptide array generated by substitution of various amino acid residues. The replacement of Trp 5 with Phe resulted in a change of peptide's secondary structure and increased binding with MAb and E-selectin, suggesting improved carbohydrate mimicry. Colonization of tumor cells expressing SA-Le(a) was blocked by the peptide and was completely abolished in E-selectin knock out mice. The data suggest the critical role of carbohydrate antigens and E-selectin in metastasis and that peptides mimicking carbohydrate antigens can function as antagonists of this process.
Publication types
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Research Support, U.S. Gov't, Non-P.H.S.
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Amino Acid Sequence
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Amino Acid Substitution
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Animals
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Antibodies, Monoclonal / immunology
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Antibody Affinity
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Binding, Competitive
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CA-19-9 Antigen
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Circular Dichroism
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Disease Models, Animal
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E-Selectin / genetics
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E-Selectin / metabolism*
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Female
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Gangliosides / antagonists & inhibitors*
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Gangliosides / chemistry
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Gangliosides / immunology
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Gangliosides / metabolism
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Gene Deletion
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Ligands
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Lung Neoplasms / drug therapy
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Lung Neoplasms / metabolism
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Lung Neoplasms / pathology*
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Mice
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Mice, Knockout
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Models, Biological
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Molecular Mimicry
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Molecular Sequence Data
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Neoplasm Metastasis / drug therapy*
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Neoplasm Metastasis / pathology
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Peptides / chemistry
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Peptides / metabolism
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Peptides / pharmacology*
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Peptides / therapeutic use
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Protein Structure, Secondary
Substances
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Antibodies, Monoclonal
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CA-19-9 Antigen
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E-Selectin
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Gangliosides
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Ligands
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Peptides
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sialyl Le(a) ganglioside