报告题目:Real-Time Near Infrared Fluorescence Imaging
research tools with the potential for clinical use
报 告 人:Dr. Donal O’Shea(Prof. and Head of the Department of Pharmaceutical and Medicinal Chemistry, RCSI)
报告时间:2014年 7月24日(星期四)下午2:00
报告地点:独墅湖校区二期云轩楼2301室
Abstract
Fluorescence imaging, utilizing molecular fluorophores, often acts as a central tool for the investigation of fundamental biological processes. It also offers huge future potential for human imaging coupled to therapeutic procedures such as fluorescence guided surgery. We have recently developed a new class of near infrared (NIR) fluorophore from which excellent in vitro and in vivo imaging probes can be developed.1 But in spite of the advantages offered by longer wavelength NIR emissions a common limitation with fluorescence imaging is the difficulty in discriminating non-specific fluorescence from fluorescence localized at a specific region of interest. This can restrict imaging to individual time points at which non-specific background fluorescence has been minimized. It would be of significant advantage if the fluorescence output could be modulated from off to on in response to specific biological events as this would permit imaging of such events in real time without background interference. Two approaches (one molecular and one nanoparticle based) to achieve this using cellular endocytosis as the NIR-fluorescence switching trigger have been developed.2 Both approaches permit continuous real-time imaging of the cellular uptake, trafficking and efflux processes as extracellular fluorophore is non-fluorescent. The principles behind the NIR-fluorescence off/on switching will be explained and illustrated in vitro and in vivo. In addition, a theranostic approach using the combination of NIR fluorescence imaging and photodynamic therapy will also be shown.3
1. (a) Tasior, M.; O’Shea, D.F. Bioconjugate Chem. 2010, 21, 1130. (b) Wu Dan, O'Shea D.F. Org. Lett. 2013, 15, 3392.
2. (a) Palma, A.; Alvarez, L.A.; Frimannsson, D.O.; Grossi, M.; Quinn, S.J.; O’Shea, D.F. J. Am. Chem. Soc. 2011, 133, 19618. (b) http://www.youtube.com/watch?v=FjipbGTf8w4.
3. O’Connor, A. E.; McGee, M. M.; Likar, Y.; Ponomarev, V.; Callanan, J. J.; O’Shea, D. F.; Byrne, A. T.; Gallagher, W. M. Intern. J. Cancer, 2012, 130, 705.
Biography
Prof. Donal O’Shea received his PhD degree in Chemistry from University College Galway in 1994. He held post-doctoral positions in the University of Edinburgh (Scotland) and Carnegie Mellon University, Pittsburgh (USA) following which he was a research scientist at Eastman Kodak Company in Rochester, New York. In 1999 he returned to academia to a position in University College Dublin and was promoted to Professor of Chemistry in 2007. In 2013 he moved to the Royal College of Surgeons in Ireland where he is the current Prof. and Head of the Department of Pharmaceutical and Medicinal Chemistry. He has received the Royal Society of Chemistry, Inaugural 2012 North/South of Ireland lectureship award, is a member of the Editorial Board of Chinese Chemical Letters. He has held visiting professorship positions at Donghua University Shanghai, University of Rennes, and the École Nationale Supérieure de Cachan Paris. He is the co-organizer of the Bilateral China-Ireland Symposia on Frontiers in Synthetic Chemistry with the fourth symposium to be held this July in USTC, Hefei. His research interests include organometallic chemistry, automated flow micro-reactors, the development of light activated therapeutics and near-infrared fluorochromes.