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- W836255802 abstract "This study aimed evaluate the effects of continual topical administration of 1% morphine on corneal analgesia in rabbits subjected to lamellar keratectomy until completion of the corneal wound healing and to assess the expression of matrix metalloproteinases (MMPs)-1, -2 and -9, type IV collagen and interleukin-10 (IL-10) during the treatment. Fifty-six animals were used. In the first experiment, 12 rabbits were divided into two groups, one (n=6) received 50 μl of topical 1% morphine (MG) every 4 hours while the other group (n=6) received 0.9% NaCl instead (CG). After keratectomies, corneas were evaluated until healing. In the second experiment, 40 animals were divided, 4 rabbits of each group were euthanized 1, 3, 6, 9, and 12 days after keratectomy and corneal samples were processed for histology, immunohistochemistry (MMP1, -9 and IV collagen), zymography (MMP-2 and -9) and ELISA (IL-10). Other 4 healthy rabbits were used as negative control. In healthy corneas, CTT did not differ significantly before and after morphine instillation. Mean corneal reepithelization rate did not differ between groups. Following keratectomy, CTT increased from the 6h to 96h time points. Scores of leukocyte infiltration, MMP-1, MMP-9 and type IV collagen expression did not differ between groups at any time point. Zymography indicated that levels of the active forms of MMP-2 and MMP-9 increased on days 6 and 9 in the MG. The levels of both latent and active forms of MMP-9, as well as of the latent form of MMP-2 decreased to values close to those of healthy corneas on day 12. IL-10 levels measured on days 1 to 6 were reduced as compared to those of healthy corneal tissue and returned to levels close to those of healthy corneas. Topical application of 1% morphine promoted corneal analgesia for up to 4 days and did not delay corneal reepithelization. The reestablishment of normal MMP levels, the presence of IL-10 levels close to baseline values at the end of the study and the expression of type IV collagen at the basement membrane in both groups reinforce that, with caution, 1% morphine can be used after lamellar keratectomy in rabbits." @default.
- W836255802 created "2016-06-24" @default.
- W836255802 creator A5044749860 @default.
- W836255802 date "2010-11-11" @default.
- W836255802 modified "2023-09-24" @default.
- W836255802 title "Duração do efeito analgésico e expressão de diferentes metaloproteinases, do colágeno tipo IV e da interleucina-10, em córneas de coelhos tratadas com morfina, após ceratectomia lamelar" @default.
- W836255802 hasPublicationYear "2010" @default.
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