Abstract Glutamine is often used to treat metabolic changes associated with anorexia-cachexia syndrome in patients with malignant neoplasms. Walker 256 tumor is an excellent model for studying these changes associated with cancer in different organs, including injuries in testicular functions. However, the effects of supplementing glutamine on testicular morphometry in this model have not yet been investigated. Thus, the objective of this study was to evaluate the effect of L-glutamine supplementation on testicular morphometry in rats transplanted with Walker 256 tumor cells. Forty puberty Wistar rats were divided into four groups: control without L-glutamine (C); control supplemented with L-glutamine (CG); inoculated with Walker 256 tumor cells (WT) and inoculated with Walker 256 tumor cells and supplemented with L-glutamine (WTG). The testicles were removed, weighed, fixed in Bouin, and included in paraffin for histomorphometric analysis. Walker 256 tumor caused quantitative changes in the tubular and intertubular compartments and tunica albuginea, with reductions in the percentages of lumen and tunica albuginea, number of Sertoli cells per gram of testis; number of Leydig cells; percentage of blood vessels and connective tissue in intertubule. However, glutamine supplementation prevented part of these changes caused by the tumor, presenting mainly a protective effect on the tunica albuginea and percentage of blood and lymph vessels in the intertubule. These results indicate the potential of L-glutamine was able to recover for testicular dysfunction associated with cancer.
The increase of heart collagen fibers in diabetics is a well known fact, but the consequences are not defined. The aim was to quantify the cardiac collagen fibers in normal and diabetic rats treated with vitamin C. We selected 32 Wistar rats, 16 diabetic animals induced endovenously with streptozootocin, and 16 healthy animals, half of them, diabetics and normals, were treated with vitamin C for 90 days. After the experimental proceeding, the hearts were removed and processed accordingly to conventional protocol for optical microscopy and specific staining for collagen. The results showed that the diabetic rats presented increase in the number of cardiac collagen fibers, but the ones treated with vitamin C showed little accumulation of fibers. It could be concluded that treatment with vitamin C is important for the prevention of heart failure in diabetic animals.
O aumento do conteúdo de fibras colágenas no coração de diabéticos é um fato bastante conhecido, suas conseqüências ainda são objeto de estudo e causam certa controvérsia, portanto este trabalho objetivou estudar a variação na quantidade das fibras de colágeno cardíacas em animais normais e diabéticos tratados pela vitamina C. Para isso foram selecionados 32 ratos Wistar, 16 diabéticos induzidos pela injeção endovenosa de estreptozootocina e 16 normais, sendo metade deles tratados com Vitamina C (diabéticos e normais) por um período de 90 dias. Após período experimental, os corações foram retirados e processados segundo protocolo convencional para microscopia óptica e coloração específica para colágeno. Os resultados mostram que animais diabéticos apresentam maior quantidade de fibras de colágeno cardíacas e que o tratamento com a vitamina C determinou um menor acúmulo na quantidade dessas fibras.