摘要:
Aiming to develop a new Tc-99m-labeled folate derivative for FR-positive tumor imaging, a simpler method has been established to synthesize the folate-drug conjugates with free alpha-carboxyl group. In this study, the conjugate pteroyl-lys-HYNIC was synthesized and labeled with Tc-99m using tricine and TPPTS as co-ligands. The radiochemical purity of the final complex Tc-99m(HYNIC-lys-pteroyl)(tricine/TPPTS), 5 was high (>98%), and it remained stable in saline and plasma over 6 h after preparation. The biologic evaluation results showed that the Tc-99m labeled pteroyl-lys conjugate was able to specifically target the FR-positive tumor cells and tissues both in vitro and in vivo, highlighting its potential as an effective folate receptor targeted agent for tumor imaging. (C) 2011 Elsevier Ltd. All rights reserved.