title: HER2- and EGFR-specific affiprobes: novel recombinant optical probes for cell imaging.
abstract: The human epidermal growth factor receptors, EGFR and HER2, are members of the EGFR family of cell-surface receptors/tyrosine kinases. EGFR- and HER2-positive cancers represent a more aggressive disease with greater likelihood of recurrence, poorer prognosis, and decreased survival rate, compared to EGFR- or HER2-negative cancers. The details of HER2 proto-oncogenic functions are not deeply understood, partially because of a restricted availability of tools for EGFR and HER2 detection (A. Sorkin and L. K. Goh, Exp. Cell Res. 2009, 315, 683-696). We have created photostable and relatively simple-to-produce imaging probes for in vitro staining of EGFR and HER2. These new reagents, called affiprobes, consist of a targeting moiety, a HER2- or EGFR-specific Affibody molecule, and a fluorescent moiety, mCherry (red) or EGFP (green). Our flow cytometry and confocal microscopy experiments demonstrated high specificity and signal/background ratio of affiprobes. Affiprobes are able to stain both live cells and frozen tumor xenograph sections. This type of optical probe can easily be extended for targeting other cell-surface antigens/ receptors.
authors.affiliation: Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Bethesda, Maryland 20892, USA.
authors.forename: Ilya
authors.initials: I
authors.lastname: Lyakhov
authors.forename: Rafal
authors.initials: R
authors.lastname: Zielinski
authors.forename: Monika
authors.initials: M
authors.lastname: Kuban
authors.forename: Gabriela
authors.initials: G
authors.lastname: Kramer-Marek
authors.forename: Robert
authors.initials: R
authors.lastname: Fisher
authors.forename: Oleg
authors.initials: O
authors.lastname: Chertov
authors.forename: Lakshman
authors.initials: L
authors.lastname: Bindu
authors.forename: Jacek
authors.initials: J
authors.lastname: Capala
mesh_terms: D000818:Animals; D001562:Benzimidazoles / Q000737:chemistry; D045744:Cell Line, Tumor; D066246:ErbB Receptors / Q000032:analysis* / Q000235:genetics / Q000378:metabolism; D005434:Flow Cytometry; D005456:Fluorescent Dyes; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D006801:Humans; D008164:Luminescent Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D018613:Microscopy, Confocal; D015335:Molecular Probes / Q000737:chemistry*; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000032:analysis* / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D014183:Transplantation, Heterologous; D000097573:Red Fluorescent Protein
chemical_list: D001562:Benzimidazoles; D066246:ErbB Receptors; D005456:Fluorescent Dyes; D049452:Green Fluorescent Proteins; D008164:Luminescent Proteins; D015335:Molecular Probes; D018719:Erb-b2 Receptor Tyrosine Kinases; D011993:Recombinant Fusion Proteins; D000097573:Red Fluorescent Protein; C485184:enhanced green fluorescent protein; C508053:ERBB2 protein, human; C017807:bisbenzimide ethoxide trihydrochloride