concanavalin-a and Vitreoretinopathy--Proliferative

This study proves the possibility of targeted use of the nonsteroidal anti-inflammatory drug lornoxicam to prevent the development of proliferative vitreoretinopathy (PVR). Triamcinolone acetonide (TA) was selected as a reference substance.. Wistar rats (N = 400) were used. PVR was modeled by intravitreal injection of dispase or concanavalin A. Lornoxicam or TA intravitreal administration was performed 20 min later. On the second and the third day, drugs were administrated systemic. Enucleation was performed on the first, third, seventh and 42nd or 56th day of the experiment.. Pro-inflammatory substances led to the development of sub- and epiretinal membranes. Lornoxicam decreased the incidence of membrane formation by 43 and 31% in dispase and concanavalin models, respectively. Membranes, formed during its use, were smaller and contained less fibrotic components. At the end of the experiment, the thickness of retinal and choroidal layers among the animals which had received the therapy was the same as the thickness of the retina and choroid of intact rats. Lornoxicam administration normalized the cyclooxygenases (COXs) expression in the retina and the choroid at the early stages of the experiment. TA application was less effective in both models.. COXs blocking during the development of PVR, overwhelming inflammation in the eye and reducing its consequences, is proved to be a much more effective and safe influence than the suppression of the entire cascade of arachidonic acid metabolism. Lornoxicam did not only improve the condition of the retina and the choroid but also significantly reduced the frequency of membrane formation.

Topics: Animals; Anti-Inflammatory Agents, Non-Steroidal; Concanavalin A; Disease Models, Animal; Intravitreal Injections; Piroxicam; Rats; Rats, Wistar; Retina; Triamcinolone Acetonide; Vitreoretinopathy, Proliferative; Vitreous Body

In this article we review and discuss the advantages of two proliferative vitreoretinopathy models in rats: intravitreal injection of proteolytic enzyme dispase and proinflammatory lectin concanavalin A. For the first time we selected clear morphological criteria for the retina evaluation during the inflammatory response. We also compared the effects of the injection of dispase and concanavalin on the 7th day after the drugs administration. We conclude that different doses of dispase can be used to get a stable model of PVR on different periods after the injection procedure.

Topics: Animals; Concanavalin A; Disease Models, Animal; Endopeptidases; Humans; Injections, Intraocular; Rats; Retina; Vitreoretinopathy, Proliferative