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01 June 2015 : Animal Research  

All-Trans Retinoic Acid Reduces Joint Adhesion Formation: An Experimental Study in Rats

Yuguang WangABCDEF, Chao ZhangE, Huan ChengC, Patricia DouglasEF, Zhiqiang WangDG, Yun LuEG

DOI: 10.12659/MSM.894086

Med Sci Monit 2015; 21:1598-1603

Abstract

BACKGROUND: Intra-articular adhesion is a common complication in post-surgical knees. The formation of post-surgical joint adhesion could lead to serious conditions. All-trans retinoic acid (ATRA) is a physiological metabolite of vitamin A that has a wide range of biological activities. The aim of the study was to verify the effects of (ATRA) in preventing adhesions in the post-operative rat knee.

MATERIAL AND METHODS: Eighty healthy adult male Wistar rats underwent femoral condyle-exposing surgery. After surgery, cotton pads soaked with the vehicle or various concentrations of ATRA (0.1%, 0.05%, 0.025%) were applied to the surgery site for 5 min. The post-surgical knee joints were fixed with micro-Kirschner wires in a flexed position for 4 weeks. The rats were killed 4 weeks after surgery. The effect of ATRA on the prevention of intra-articular adhesion was evaluated using histological analyses, hydroxyproline content, visual score, and inflammatory factor activity evaluation.

RESULTS: No obvious postoperative complications or signs of infection in the rats were observed. None of the rats died before the scheduled time. The rats in the 0.1% ATRA group showed better outcomes, as suggested by the visual scores, hydroxyproline contents, and inflammatory factors expressional levels, than the other 2 groups. The local application of 0.1% ATRA was able to suppress adhesions, collagen expression, and inflammatory activity in the post-surgical rat knees.

CONCLUSIONS: In the rat knee surgery model, the application of intra-articular ATRA was able to decrease intra-articular scar adhesion formation, collagen expression, and inflammatory activities. ATRA was found to work in a dose-dependent manner, with 0.1% being possible optimal concentration.

Keywords: Bone Wires, Dose-Response Relationship, Drug, Femur - surgery, Hindlimb - pathology, Histological Techniques, Hydroxyproline - metabolism, Joints - pathology, Rats, Wistar, Tissue Adhesions - prevention & control, Tretinoin - pharmacology

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750