Rational Design and Generation of a Bimodal Bifunctional Ligand for Antibody-Targeted Radiation Cancer Therapy
作者:Hyun-Soon Chong、Xiang Ma、Thien Le、Baidoo Kwamena、Diane E. Milenic、Erik D. Brady、Hyun A. Song、Martin W. Brechbiel
DOI:10.1021/jm070401q
日期:2008.1.1
An antibody-targeted radiation therapy (radioimmunotherapy, RIT) employs a bifunctional ligand that can effectively hold a cytotoxic metal with clinically acceptable complexation kinetics and stability while being attached to a tumor-specific antibody. Clinical exploration of the therapeutic potential of RIT has been challenged by the absence of adequate ligand, a critical component for enhancing the efficacy of the cancer therapy. To address this deficiency, the bifunctional ligand C-NETA in a unique structural class possessing both a macrocyclic cavity and a flexible acyclic moiety was designed. The practical, reproducible, and readily scalable synthetic route to C-NETA was developed, and its potential as the chelator of Bi-212, Bi-213, and Lu-177 for RIT was evaluated in vitro and in vivo. C-NETA rapidly binds both Lu(III) and Bi(III), and the respective metal complexes remain extremely stable in serum for 14 days. Lu-177-C-NETA and Bi-205/6-C-NETA possess an excellent or acceptable in vivo biodistribution profile.