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BioMed Research International
Volume 2016, Article ID 6825712, 7 pages
http://dx.doi.org/10.1155/2016/6825712
Research Article

Near-Infrared Fluorescence Imaging of Carbonic Anhydrase IX in Athymic Mice Bearing HT-29 Tumor Xenografts

Department of Nuclear Medicine, Inner Mongolia Medical University Affiliated Hospital, Hohhot 010050, China

Received 18 March 2016; Revised 25 May 2016; Accepted 20 July 2016

Academic Editor: Edward W. Martin

Copyright © 2016 Jianbo Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Near-infrared fluorescence (NIRF) imaging technology is a highly sensitive imaging modality and has been widely used in noninvasively studying the status of receptor expression in small animal models, with an appropriate NIRF probe targeting a specific receptor. In this report, Cy5.5-conjugated anti-CAIX monoclonal antibody (Mab-Cy5.5) was evaluated in athymic mice bearing HT-29 tumor xenografts in order to investigate the effect of conjugate on tumor targeting efficacy. In vitro binding studies showed that Mab-Cy5.5 could specifically bind to the cells which expressed CAIX. Results from in vivo imaging showed that HT-29 tumor xenografts can be clearly visualized at 48 h after injection of Mab-Cy5.5, and in the blocking experiment, free anti-CAIX antibody effectively blocked the concentration of Mab-Cy5.5 in the tumors. Western blotting and immunohistochemistry analysis of HT-29 tumor xenografts verified the expression of CAIX in HT-29 tumors. Mab-Cy5.5 could specifically bind to the tumors which expressed CAIX. These results suggested that Mab-Cy5.5 was suitable for CAIX expression imaging in the preclinical research.