title: Near infrared optical visualization of epidermal growth factor receptors levels in COLO205 colorectal cell line, orthotopic tumor in mice and human biopsies.
abstract: In this study, we present the applicability of imaging epidermal growth factor (EGF) receptor levels in preclinical models of COLO205 carcinoma cells in vitro, mice with orthotopic tumors and ex vivo colorectal tumor biopsies, using EGF-labeled with IRDye800CW (EGF-NIR). The near infrared (NIR) bio-imaging of COLO205 cultures indicated specific and selective binding, reflecting EGF receptors levels. In vivo imaging of tumors in mice showed that the highest signal/background ratio between tumor and adjacent tissue was achieved 48 hours post-injection. Dissected colorectal cancer tissues from different patients demonstrated ex vivo specific imaging using the NIR bio-imaging platform of the heterogeneous distributed EGF receptors. Moreover, in the adjacent gastrointestinal tissue of the same patients, which by Western blotting was demonstrated as EGF receptor negative, no labeling with EGF-NIR probe was detected. Present results support the concept of tumor imaging by measuring EGF receptor levels using EGF-NIR probe. This platform is advantageous for EGF receptor bio-imaging of the NCI-60 recommended panel of tumor cell lines including 6-9 colorectal cell lines, since it avoids radioactive probes and is appropriate for use in the clinical setting using NIR technologies in a real-time manner.
authors.affiliation: School of Pharmacy, Institute for Drug Research, Faculty of Medicine, the Hebrew University of Jerusalem, Jerusalem 91120, Israel. gadifco@gmail.com
authors.forename: Gadi
authors.initials: G
authors.lastname: Cohen
authors.forename: Shimon
authors.initials: S
authors.lastname: Lecht
authors.forename: Mor
authors.initials: M
authors.lastname: Oron-Herman
authors.forename: Tatjana
authors.initials: T
authors.lastname: Momic
authors.forename: Aviram
authors.initials: A
authors.lastname: Nissan
authors.forename: Philip
authors.initials: P
authors.lastname: Lazarovici
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D015179:Colorectal Neoplasms / Q000378:metabolism* / Q000473:pathology; D004815:Epidermal Growth Factor / Q000737:chemistry / Q000378:metabolism; D066246:ErbB Receptors / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D011485:Protein Binding; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000378:metabolism; D019265:Spectroscopy, Near-Infrared; D014183:Transplantation, Heterologous; D051598:Whole Body Imaging
chemical_list: D034741:RNA, Small Interfering; D004815:Epidermal Growth Factor; D066246:ErbB Receptors