RADIOIMAGING MOIETIES COUPLED TO PEPTIDEASE-BINDING MOIETIES FOR IMAGING TISSUES AND ORGANS THAT EXPRESS PEPTIDASES
                        
                            
                                申请人:Babich J. W.
                            
                            
                                公开号:US20080213172A1
                            
                            
                                公开(公告)日:2008-09-04
                            
                            Conjugates, methods and kits are described for imaging tissues and organs that express one or more peptidases. In a preferred embodiment of the invention, a series of di-(2-pyridylmethyl)amine (D) ligands, which can bind M(CO)
3
+
[M=Tc or Re], were coupled to lisinopril (L). Aliphatic tethers with varying number of methylene groups (3, 4, 5, and 7; D(C
4
)L, D(C
5
)L, D(C
6
)L, and D(C
8
)L, respectively) were utilized, with in vitro inhibitory activity increasing with increasing number of methylene groups. The D(C
8
)L conjugate was observed to be significantly more potent than D(C
4
)L. In vivo specificity for ACE was studied in both tissue distribution and gamma imaging studies, demonstrating localization in tissues with high ACE content. Localization was blocked by pretreatment with lisinopril.