ABSTRACT
ABSTRACT Objective: Transient receptor potential melastatin (TRPM) are integral membrane proteins that have broad range of cellular functions. Roles of TRPM2, TRPM3, TRPM4 and TRPM7 among these channels are very important, and their roles in lung ischaemia/reperfusion injury have not been evaluated yet. The aim of this study is to investigate the contribution of these genes in lung ischaemia/reperfusion injury and evaluate histopathology of tissues. Methods: A total of 40 Wistar albino rats were enrolled for the study. Ischaemia was performed by the application of an atramvatic clamp to pulmonary artery. Gene expressions were determined by the semi-quantitative reverse transcription-polymerase chain reaction method. Histopatholical evaluations were held by a standard haematoxyline-eosin staining. Results: The major histopathological tissue damage was observed in ischaemia performed groups, and expression of TRPM channels was found to be obviously downregulated. Substantial changes were determined between TRPM2, TRPM3, TRPM4 and TRPM7 and lung ischaemia/reperfusion injury. In particular, expression of TRPM2 and TRPM7 was reversibly downregulated in ischaemia. Yet, the expression of TRPM3 and TRPM4 was irreversibly down-regulated after ischaemia. Conclusion: Consequently, these results indicate that TRPM family of cation channels may have significant roles in the lung ischaemia/reperfusion injury.
ABSTRACT
To evaluate the renal sodium-potassium adenosine triphosphatase [Na+/K+ATPase] activity, kidney morphology, and the probable protective effects of 2 different anesthetic agents used during pneumoperitoneum [PP]. The study was performed at Gazi University Experimental Research Center, Ankara, Turkey between January and July 2009. Twenty-four Wistar albino male rats weighing 320-380 g were randomly allocated to 4 groups after receiving ethics committee approval. All rats were cannulated, intubated, and ventilated under ketamine anesthesia. No further surgical intervention was performed for group I. An intraabdominal pressure [IAP] of 10 mm Hg was created by CO[2] insufflation in 18 animals for one hour. The animals in group II received no further anesthetic agents, while the animals in groups III and IV received propofol and sevoflurane. At the end of the protocol, all animals underwent left nephrectomy without sacrificing. Urine was collected from each animal for the following 24 hour for the evaluation of urine creatinine and protein. The activity of renal Na+/K+ATPase was significantly lower in groups II [p=0.014], III [p=0.019], and IV [p=0.032] compared to group I. The pathological score was significantly higher in groups II [p=0.017], III [p=0.028], and IV [p=0.039] compared to group I. No statistically significant difference was found among groups II, III, and IV in terms of Na+/K+ATPase activity and pathological scores. Elevated IAP is related with impaired kidney functions and morphology, and the so-called renoprotective agents neither improved, nor worsened PP-related renal impairment
ABSTRACT
To determine the effect of intraperitoneal [ip] nicotine on the recovery of rats receiving general anesthesia compared with placebo. The placebo controlled experimental study was conducted in the Faculty of Medicine, Gazi University, Turkey, between April and May 2005. Twenty-one male and 21 female rats were randomly divided into 3 groups. Group C [n=14], comprising a female group CF [n=7], and male group CM [n=7] received ip 0.9% sodium chloride [NaCl], group P [n=14], comprising a female group PF [n=7], and male group PM [n=7] received ip propofol 150 mg/kg, and group NP [n=14], comprising a female group NPF [n=7], and male group NPM [n=7] received 0.4 mg/kg ip nicotine followed by 150 mg/kg propofol after 15 minutes. For the evaluation of recovery period, tail pinch test was used, and for cognitive performance, the radial arm maze test was used. The number of entrances and exits decreased in group P significantly compared to group C [p<0.05], and the decrease in group PF was higher than it was in group PM. Entrance and exit in group NP increased significantly compared to group P [p<0.05]. The increase in entrance and exit in group NPF was much higher compared to group NPM. The recovery period in group NP was significantly shorter than in group P [p<0.05]. The ip administration of nicotine in rats shortens the recovery from propofol anesthesia and improves cognitive performance