Synthesis and characterization of αvβ3-targeting peptidomimetic chelate conjugates for PET and SPECT imaging
作者:Young-Seung Kim、Kido Nwe、Diane E. Milenic、Martin W. Brechbiel、Stanley Satz、Kwamena E. Baidoo
DOI:10.1016/j.bmcl.2012.07.024
日期:2012.9
There is growing interest in small peptidomimetic alpha(v)beta(3) integrin antagonists that are readily synthesized and characterized and can be easily handled using physiological conditions. Peptidomimetic 4-[2-(3,4,5,6-tetrahydropyrimidine-2-ylamino)ethyloxy]benzoyl-2-[N-(3-amino-neopenta-1-carbamyl)] -aminoethylsulfonyl-amino-beta-alanine (IAC) was successfully conjugated to 1-(1-carboxy-3-carbo-t-but-oxypropyl)-4,7-(carbo-tert-butoxymethyl)-1,4,7-triazacyclononane (NODA-GA(tBu)(3)) and 1-(1-carboxy-3-carbotertbutoxymethyl)-1,4,7,10-tetraazacyclododecane (DOTA-GA(tBu)(4)) and radiolabeled with In-111, Ga-67 and Pb-203. Results of a radioimmunoassay demonstrated binding to purified alpha(v)beta(3) integrin when 14 equiv of integrin were added to the reaction. Based on this promising result, investigations are moving forward to evaluate the NODA-GA-IAC and DOTA-GA-IAC conjugates for targeting tumor associated angiogenesis and alpha(v)beta(3) integrin positive tumors to define their PET and SPECT imaging qualities as well as their potential for delivery of therapeutic radionuclides. Published by Elsevier Ltd.