Journal
BIOMATERIALS
Volume 69, Issue -, Pages 165-173Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2015.08.018
Keywords
Anti-adhesive agent; Redox injectable gel; Reactive oxygen species; Polyion-complex micelle
Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [25220203]
- World Premier International Research Center Initiative (WPI Initiative) on Materials Nano-architronics from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- Grants-in-Aid for Scientific Research [15H04281, 26102712, 26560041, 26670738] Funding Source: KAKEN
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Postsurgical tissue adhesion formation caused by inflammation and oxidative stress is one of the serious issues because it induces severe clinical disorders. In this study, we designed redox injectable gel (RIG) which covalently possesses nitroxide radicals as a reactive oxygen species (ROS) scavenger for high performance anti-adhesion agent. The redox flower micelles exhibiting gelation under physiological conditions were prepared by a polyion complex (PIC) between polyamine-PEG-polyamine triblock copolymer possessing nitroxide radicals as a side chain of polyamine segments and poly(acrylic acid). RIG showed prolonged local retention in the abdominal cavity of the mice, which was monitored by in vivo imaging system (IVIS). Compared with a commercial anti-adhesion agent (Seprafilm (R), Genzyme, Cambridge, MA), RIG dramatically inhibited the formation of tissue adhesions via a combination of physical separation and biological elimination of generated ROS in talc-induced adhesion model mice. Treatment with RIG suppressed inflammatory cytokines and neutrophil invasion, suppressing the increase in peritoneal membrane thickness. It is also emphasized that RIG suppressed the increase of white blood cells level, indicating that the present RIG treatment effectively prevents diffusion of local inflammation to entire body. These findings indicate that RIG has a great potential as a high performance anti-adhesion agent. (C) 2015 Elsevier Ltd. All rights reserved.
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