title: Development of Follicle-Stimulating Hormone Receptor Binding Probes to Image Ovarian Xenografts.
abstract: The Follicle-Stimulating Hormone Receptor (FSHR) is used as an imaging biomarker for the detection of ovarian cancer (OC). FSHR is highly expressed on ovarian tumors and involved with cancer development and metastatic signaling pathways. A decapeptide specific to the FSHR extracellular domain is synthesized and conjugated to fluorescent dyes to image OC cellsin vitroand tumors xenograft modelin vivo. Thein vitrobinding curve and the average number of FSHR per cell are obtained for OVCAR-3 cells by a high resolution flow cytometer. For the decapeptide, the measured EC50 was 160 μM and the average number of receptors per cell was 1.7 × 107. The decapeptide molecular imaging probe reached a maximum tumor to muscle ratio five hours after intravenous injection and a dose-dependent plateau after 24-48 hours. These results indicate the potential application of a small molecular weight imaging probe specific to ovarian cancer through binding to FSHR. Based on these results, multimeric constructs are being developed to optimize binding to ovarian cells and tumors.
authors.affiliation: Medical Physics Program, School of Health Science, Purdue University, West Lafayette, IN, USA.
authors.forename: Chung-Wein
authors.initials: CW
authors.lastname: Lee
authors.affiliation: Department of Medicine, Indiana University School of Medicine, Indianapolis IN, USA.
authors.forename: Lili
authors.initials: L
authors.lastname: Guo
authors.affiliation: Department of Medicine, Indiana University School of Medicine, Indianapolis IN, USA.
authors.forename: Daniela
authors.initials: D
authors.lastname: Matei
authors.affiliation: Medical Physics Program, School of Health Science, Purdue University, West Lafayette, IN, USA; Department of Medicine, Indiana University School of Medicine, Indianapolis IN, USA.
authors.forename: Keith
authors.initials: K
authors.lastname: Stantz
keywords: Decapeptide; Follicle-stimulating hormone receptor; Multimeric peptide; Near-infrared imaging; Ovarian cancer