Efeito protetor da L-arginina e L-glutamina no pênis de ratos submetidos à irradiação pélvica / Protective effects of L-arginine and L-glutamine on the penis of rats submitted to pelvic radiation

AUTOR(ES)

Jorge Luiz Medeiros Júnior

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

28/07/2010

RESUMO

We investigated whether arginine and glutamine protect penile tissues against radiation-induced damage. Groups of Wistar rats were treated with: no intervention; pelvic radiation, and sacrifice 7 (RAD7) or 15 (RAD15) days later; and pelvic radiation, daily supplementation with L-arginine (A) or L-glutamine (G), and sacrifice 7 (RAD7+A, RAD7+G) or 15 (RAD15+A, RAD15+G) days after radiation. Structural components in the corpus cavernosum (CC), tunica albuginea of the corpus spongiosum (TACS), and urothelium of the penis were analyzed using stereological and immunohistochemical methods. The results showed that in the CC, connective tissue was increased in RAD15 (p<0.04), but this change was partially prevented in RAD15+G (p<0.05) and RAD15+A (p<0.04). The fibrous matrix of the CC trabeculae was stained for collagen type I. In RAD15, the intensity of the labeling was increased, whereas in RAD15+G and RAD15+A the staining was similar to that of the controls. No staining changes were seen in the groups that were sacrificed seven days after radiation. Cavernosal elastic fiber content in RAD15 was increased (p<0.004), and this was prevented in RAD15+A (p<0.004), but not in RAD15+G. In TACS, the aminoacids protected (p<0.02) against radiation-induced increase in elastic fiber content, but only in RAD15. Cell density in the urothelium, and urothellial thickness, were reduced in RAD15 (p<0.004), but there were protective effects of both aminoacids. In conclusion, radiation-induced alterations in penile structures tend to be more pronounced 15 days after radiation session. Both A and G have protective effects against these changes, with the former being slightly more effective.

ASSUNTO(S)

radiação pênis l-arginina l-glutamina cirurgia experimental radiation penis l-arginine l-glutamine

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