DAWLEY RATS

roponin I (TnI) is a crucial component of the troponin complex in striated muscle, playing a central role in regulating contraction and relaxation through calcium interaction. Heat stress refers to the overall response of the human body to the combined effects of environmental factors and temperature. It indicates how much heat the body is exposed to within its thermal surroundings. The justification for studying troponin I levels in heat-exposed Sprague-Dawley female rats is grounded in the need to understand cardiac responses to hyperthermia. Elevated troponin I levels can indicate myocardial injury, which is critical during heat stress conditions. The study aimed to explore the connection between heat exposure and myocardial damage by
examining variations in cardiac troponin I (cTnI) levels in heat-exposed Sprague-Dawley female rats. The rats were randomly divided into four groups (1, 2, 3 and 4) for a period of eight weeks. The rats were exposed to heat for 1 to 2 hours daily at a temperature of 38°C to 40°C. Group 1 served as the control group which were not exposed to heat. Group 2 was exposed to heat for 14 days and group 3 and 4 were exposed to heat for 28 days and 42 days respectively. At the end of the experiment, each animal was first anaesthetized using chloroform vapour, followed by a dissection procedure to harvest the heart tissue. After harvesting the heart tissue, it was minced into small pieces and homogenised using phosphate buffer solution, thereafter spun and the supernatant was collected and sent for biochemical analysis. Statistical analysis was done using graph pad prism version 10.4. Results were presented as mean ± standard error of mean. One Way Analysis of Variance (ANOVA) was used to compare the means of tests and control value while post hoc test was done using Dunnett's multiple comparison test and a P-value of less than 0.05 was considered statistically significant. The result gotten from this research shows that mild heat exposure may not induce noticeable cardiac stress. In conclusion, long periods of high temperature exposure may indicate possible myocardial alteration, so heat exposure should be kept within reasonable limits

Aspartame (ASP) is an artificial sweetener used in food products as an alternative to sugar. Concerns relating to the possible adverse health effects of its consumption have been raised due to aspartame’s metabolic components which are formed during its breakdown. Some research studies have associated aspartame consumption with health disorders such as cancers, neurochemical changes, hepatotoxicity etc, since the liver helps in the metabolism and detoxification of harmful substances and drugs, it acts as a filter to clean the blood. Therefore, the purpose of this study was to investigate the effect of aspartame on liver function parameters in male Sprague Dawley rats. The rats were thirty-one (31) and were divided into five (5) groups: control, groups B-E. Group A (control) received 0.5ml of plain distilled water via gastric gavage. Group B, Group C, Group D, and Group E received (40, 80, 160, 320) mg/kg respectively for a duration of 75days. Results from this study showed a dose-dependent increase in serum Alkaline Transaminase (ALT) concentration between the control and the groups administered aspartame, but the liver ALT showed no significant difference. However, there was no significant difference between the means of the serum Aspartate Transaminase (AST) of the control group and groups administered aspartame. Also the result shows a dose dependent decrease in serum Alkaline Phosphatase (ALP), and a non significant difference in the means of liver ALP. Result from the present study showed significant difference in serum Gammaglutamyl Transferase (GGT) only when the control group was compared with the group administered 40mg/kg. However, the serum protein, heart protein and liver protein results between all groups in this study, showed no significant difference, but however a significant decrease was observed in the kidney proteins of the rats administered aspartame, especially in the group that received 160mg/kg. The level of testis protein increased in the groups that received 80mg/kg and 160mg/kg when compared to control. However, the amount of serum globulin in the aspartame-administered groups was not different from that of the control group. Aspartame may act as a chemical stressor by altering organ function homeostasis and increasing protein oxidative damage. This might play a significant role in promoting apoptotic cell death leading to damage of the organs and subsequently death.