Novel ^99mTc-Labeled Glucose Derivative for Single Photon Emission Computed Tomography: A Promising Tumor Imaging Agent

Abstract

In this study, a d-glucosamine derivative with an isonitrile group (CN5DG) was synthesized and it was chosen to coordinate with ^99mTc for preparing ^99mTc-CN5DG. ^99mTc-CN5DG could be readily obtained with high radiochemical purity (>95%) and had great in vitro stability and metabolic stability in urine. The radiotracer demonstrated a positive response to the administration of glucose and insulin in S180 and A549 tumor cells in vitro, suggesting the mechanism of ^99mTc-CN5DG into tumor cells was related to glucose transporters. Biodistribution studies in mice bearing A549 xenografts showed ^99mTc-CN5DG had a high tumor uptake and high tumor-to-background ratios. SPECT/CT images further supported its ability for tumor imaging. As a cheap, conveniently made and widely available probe, ^99mTc-CN5DG would become a potential "working horse" and be a breakthrough in ^99mTc-labeled radiopharmaceuticals for tumor detection.