Development of hypoxia-sensitive Gd3+-based MRI contrast agents
摘要:
Hypoxia occurs in various diseases, including cancer, ischemia, and acute and chronic vascular diseases. Here we describe the design and synthesis of the first hypoxia-sensitive MRI contrast agents, SAGds. SAGds showed a pH-dependent r(1) relaxivity change associated with intramolecular chelation of the nitrogen atom of the sulfonamide moiety to the Gd3+ center. There was a correlation between the pK(a) of the r(1) relaxivity change and the sum of the Hammett sigma constants of substituents on the aromatic ring. Among the synthesized compounds, 4NO(2)2MeOSAGd was selectively reduced to the amine by rat liver microsomes under hypoxic conditions, resulting in a 1.8-fold increment of the r(1) relaxivity owing to the change in pK(a) of the arylsulfonamide moiety. This enhancement of the r(1) relaxivity could be clearly detected in T-1-weighted MR images. Thus, 4NO(2)2MeOSAGd is a 'smart' MRI contrast agent for the detection of hypoxia under physiological conditions. (C) 2012 Elsevier Ltd. All rights reserved.
Development of hypoxia-sensitive Gd3+-based MRI contrast agents
摘要:
Hypoxia occurs in various diseases, including cancer, ischemia, and acute and chronic vascular diseases. Here we describe the design and synthesis of the first hypoxia-sensitive MRI contrast agents, SAGds. SAGds showed a pH-dependent r(1) relaxivity change associated with intramolecular chelation of the nitrogen atom of the sulfonamide moiety to the Gd3+ center. There was a correlation between the pK(a) of the r(1) relaxivity change and the sum of the Hammett sigma constants of substituents on the aromatic ring. Among the synthesized compounds, 4NO(2)2MeOSAGd was selectively reduced to the amine by rat liver microsomes under hypoxic conditions, resulting in a 1.8-fold increment of the r(1) relaxivity owing to the change in pK(a) of the arylsulfonamide moiety. This enhancement of the r(1) relaxivity could be clearly detected in T-1-weighted MR images. Thus, 4NO(2)2MeOSAGd is a 'smart' MRI contrast agent for the detection of hypoxia under physiological conditions. (C) 2012 Elsevier Ltd. All rights reserved.
The present invention is related to quinoxaline compounds of Formula (I) in particular for the treatment of autoimmune disorders and/or inflammatory diseases, cardiovascular diseases, neurodegenerative diseases, bacterial or viral infections, kidney diseases, platelet aggregation, cancer, transplantation, graft rejection or lung injuries.
Quinoxaline inhibitors of phosphoinositide-3-kinases (PI3Ks)
申请人:Gaillard Pascale
公开号:US08614215B2
公开(公告)日:2013-12-24
The present invention is related to quinoxaline compounds of Formula (I) in particular for the treatment of autoimmune disorders and/or inflammatory diseases, cardiovascular diseases, neurodegenerative diseases, bacterial or viral infections, kidney diseases, platelet aggregation, cancer, transplantation, graft rejection or lung injuries.