title: Bacteriophage biopanning in human tumour biopsies to identify cancer-specific targeting ligands.
abstract: Intravenous targeting of anticancer agents should improve both efficacy and therapeutic index. However, rational design of targeting constructs requires detailed definition of receptor targets and must take account of polarised tissue architecture that may restrict access to chosen receptors from the bloodstream. Bacteriophage biopanning provides a solution to this problem, identifying targeting sequences by functional selection rather than design, although reiterative panning in polarized human tumours has not previously been attempted. Here, we report an ex vivo, intra-arterial method for biopanning in freshly-resected human tumours, enabling reiterative selection of oligopeptide sequences capable of intravascular targeting to human colorectal tumours. Significant consensus was observed after two rounds of panning in tumours from different patients, and lead sequences demonstrated tumour targeting in samples from unrelated patients. This novel approach may be applicable to a wide range of settings, thus enabling iteration of consensus targeting sequences for tumour imaging and selective delivery of anticancer agents.
authors.affiliation: Cancer Research UK Institute for Cancer Studies, University of Birmingham, and Department of Surgery, Selly Oak Hospital, UK.
authors.forename: Fukuto
authors.initials: F
authors.lastname: Maruta
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Akita
authors.forename: Jun
authors.initials: J
authors.lastname: Nakayama
authors.forename: Shinichi
authors.initials: S
authors.lastname: Miyagawa
authors.forename: Tariq
authors.initials: T
authors.lastname: Ismail
authors.forename: David C
authors.initials: DC
authors.lastname: Rowlands
authors.forename: David J
authors.initials: DJ
authors.lastname: Kerr
authors.forename: Kerry D
authors.initials: KD
authors.lastname: Fisher
authors.forename: Leonard W
authors.initials: LW
authors.lastname: Seymour
authors.forename: Alan L
authors.initials: AL
authors.lastname: Parker
mesh_terms: D001158:Arteries / Q000378:metabolism*; D001435:Bacteriophages / Q000737:chemistry / Q000378:metabolism*; D001706:Biopsy; D015179:Colorectal Neoplasms / Q000098:blood supply* / Q000473:pathology*; D006801:Humans; D008024:Ligands; D009842:Oligopeptides / Q000008:administration & dosage / Q000378:metabolism; D019151:Peptide Library; D020539:Sequence Analysis, Protein
chemical_list: D008024:Ligands; D009842:Oligopeptides; D019151:Peptide Library