Accession Number : ADA612115

Title :   Development of a Novel Method to Detect Prostate Cancer Circulating Tumor Cells (CTCs) Based on Epithelial-Mesenchymal Transition Biology

Descriptive Note : Final rept. 10 Sep 2012-9 Sep 2014

Corporate Author : DUKE UNIV DURHAM NC

Personal Author(s) : Armstrong, Andrew J

Full Text :

Report Date : Dec 2014

Pagination or Media Count : 42

Abstract : The purpose of this DOD NIA is to develop a novel method to detect circulating tumor cells (CTCs) from men with metastatic castration resistant prostate cancer (CRPC) based on a range of CTC phenotypes. The novel method employs a nanoparticle polymersome that contains near-infrared emissive porphyrins and permits antibody conjugation for target engagement and flow sorting in the infrared spectrum for specificity. We are developing near infrared emissive polymersomes (NIR-EPs) that contain antibodies to EpCAM, N-cadherin, OB-cadherin, and PSMA which permit the isolation and enumeration ev vivo of CTCs bearing these antigens in the circulation of men with CRPC. These specialized CTC detection nanoparticles permit the isolation of specific CTC phenotypes including epithelial, mesenchymal, and prostate cancer specific targets. In year 2 we have continued to optimize the methodology and chemistry for the creation of these NIR-EPs, including chemical synthesis, antibody conjugation, optimal reagents and processing, positive and negative control cell applications, and methods for red cell lysis, leukocyte depletion, and flow sorting of CTCs in the infrared spectrum. Challenges have included specificity due to antibody affinity during conjugation. This work is ongoing in the Therien laboratory to provide a clinical reagent for the ex vivo capture and identification of CTCs without binding to leukocytes nonspecifically. A 6 month no cost extension was requested to continue this optimization process.


Subject Categories : Biology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE