Novel peptide ligands for integrin α4β1 overexpressed in cancer cells

Masahito Mikawa, Henry Wang, Linlang Guo, Ruiwu Liu, Jan Marik, Yoshikazu Takada, Kit Lam, Derick H Lau

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Using the "one-bead one-peptide" combinatorial technology, a library of random cyclic octapeptides and nonapeptides, consisting of natural and unnatural amino acids, was synthesized on polystyrene beads. This library was used to screen for peptides that promoted attachment and proliferation of bronchioloalveolar carcinoma cells (H1650), employing a "cell growth on bead" assay. Consensus peptide sequences of cNIeDXXXXc and cXNIeDXXXXc (where NIe is norleucine) were identified. With alanine scanning and site-directed deletion, a typical ligand consisted of a motif of -NIeDI/V/NIe- with two flanking cysteines. These peptide ligands were specific for promoting cell attachment of the H1650 cells and the cells of lymphoid cancers (Jurkat and Raji) but not other selected human cell lines of lung cancer and fibroblast. In an antibody blocking assay, integrin α4β1 which was overexpressed in H1650, Jurkat, and Raji, was identified as a putative receptor for these peptide ligands. Using Chinese hamster ovary cells transfected with either wild-type or mutant integrin ≤4, a critical binding site for these peptides was localized to the glycine residue at position 190 of integrin α4.

Original languageEnglish (US)
Pages (from-to)1329-1334
Number of pages6
JournalMolecular Cancer Therapeutics
Volume3
Issue number10
StatePublished - Oct 2004

ASJC Scopus subject areas

  • Oncology
  • Drug Discovery
  • Pharmacology

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