title: Anti-adhesive effect of poloxamer-based thermo-sensitive sol-gel in rabbit laminectomy model.
abstract: Poloxamer-based thermo-sensitive sol-gel has been developed to reduce the incidence of postoperative scar formation at the laminectomy site. The purpose of this study was to evaluate the anti-adhesive effect of poloxamer based thermo-sensitive sol-gel compared to hyaluronate based solution after laminectomy, using a rabbit model. A thermo-sensitive anti-adhesive with a property of sol-gel transition was manufactured by a physical mixture of Poloxamer188/407, Chitosan and Gelatin. The viscosity in different temperatures was assessed. 72 adult New Zealand rabbits underwent lumbar laminectomy and were randomly divided into experimental (treated with the newly developed agent), positive (treated with hyaluronate based solution), and negative control groups. Each group was subdivided into 1 and 4-week subgroups. Gross and histological evaluations were performed to assess the extent of epidural adhesion. The experimental group showed significantly higher viscosity compared to the positive control group and showed a significant increase of viscosity as the temperature increased. Gross evaluation showed no statistically significant differences between the 1- and 4-week subgroups. However, histologic evaluation showed significant differences both in 1- and 4-week subgroups. Although the 4-week histologic results of the experimental and the positive control subgroups showed no significant difference, both subgroups revealed higher value compared to the negative control subgroup with regard to the ratio of adhesion less than 50 %. The new poloxamer based thermo-sensitive agent showed superior efficacy over the hyaluronate based agent at 1 week postoperatively. At 4 weeks postoperatively, there were no statistically significant differences between the two agents, although both showed efficacy over the sham group.
authors.affiliation: Department of Orthopedic Surgery, College of Medicine, SMG-SNU Boramae Medical Center, Seoul National University, Seoul, 156-707, Korea.
authors.forename: Sung Joon
authors.initials: SJ
authors.lastname: Shin
authors.affiliation: Department of Orthopedic Surgery, College of Medicine, SMG-SNU Boramae Medical Center, Seoul National University, Seoul, 156-707, Korea. spinelee@snu.ac.kr.|Institute of Medical and Biological Engineering, Seoul National University Medical Research Center, Seoul, 110-799, Korea. spinelee@snu.ac.kr.
authors.forename: Jae Hyup
authors.identifier: http://orcid.org/0000-0002-2141-0266
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Research & Development Center, CGbio Co., Ltd. Seongnam-si, Gyeonggi-do, 462-120, Korea.
authors.forename: Jungwon
authors.initials: J
authors.lastname: So
authors.affiliation: Research & Development Center, CGbio Co., Ltd. Seongnam-si, Gyeonggi-do, 462-120, Korea.
authors.forename: Kyungdan
authors.initials: K
authors.lastname: Min
mesh_terms: D000268:Adhesiveness; D000818:Animals; D002448:Cell Adhesion; D048271:Chitosan / Q000737:chemistry; D002921:Cicatrix / Q000517:prevention & control*; D004824:Epidural Space / Q000378:metabolism; D005780:Gelatin / Q000737:chemistry; D006820:Hyaluronic Acid / Q000737:chemistry; D007796:Laminectomy / Q000379:methods*; D008297:Male; D044367:Phase Transition; D020442:Poloxamer / Q000737:chemistry*; D011183:Postoperative Complications; D011817:Rabbits; D013696:Temperature; D000267:Tissue Adhesions / Q000473:pathology / Q000517:prevention & control*; D014783:Viscosity
chemical_list: D020442:Poloxamer; D005780:Gelatin; D006820:Hyaluronic Acid; D048271:Chitosan