RESUMEN
H(2)S has been proposed as physiological important molecule. It is considered as first endogenous gaseous K(+) channel opener. K(+) ATP channel activity is mainly responsible for insulin secretion. K(+)ATP channel opening of ß cells leads to inhibition of insulin secretion and channels closing leads to secretion. H2S is the gaseous K(+) ATP channel opener but it does not have channel specificity. So, H(2)S may have some effect on insulin secretion. H(2)S is high in Zuker diabetic fatty rats. That means H(2)S is high in insulin resistance condition. We tried to find out the role of H(2)S in insulin secretion and in development of insulin resistance. From the result of our study, H(2)S have K(+) ATP channel opening activity on ß cells. H(2)S does not have any role in the development of insulin resistance. Decrease in insulin level in Zuker diabetic rat and streptozotocin-induced diabetic rat is due to high H(2)S level.
RESUMEN
The present study was undertaken to study the role of PAR-2 receptor activation in pathophysiology of intestinal inflammation. Inflammatory bowel disease was induced in Wistar albino rats by intrarectal administration of 2, 4, 6 trinitrobenzenesulfonic acid (TNBS, 0.25 ml 120 mg/ml in 50% ethanol intrarectally, on 1(st) day only). Trypsin (500 µg/kg, 1 mg/kg, 5 mg/kg, intrarectal) was given from the same day up to 20 days. Various physical parameters including body weight, food and water intake were measured on 1(st) and 20(th) days. At end of the experiment, colon weight and various histopathological indexes were assessed. The colon homogenate malondialdehyde (MDA), myeloperoxidase (MPO), and superoxide dismutase (SOD) and % mast cell protection in mesentery were also measured. Trypsin at higher dose (5 mg/kg) showed the higher level of oxidative enzymes and lower level of protective enzymes as compared to the animals treated with only TNBS. Trypsin treatment produced significantly more mast cell degranulation. Finally in the histopathology, there was increased in severity of the disease in trypsin-treated animals. The role of PAR-2 (protease activated receptor-2) receptor in gut is pro-inflammatory and thus appears as a new potential therapeutic target for inflammatory bowel disease treatments.