Sporadic dementia of Alzheimer's type (SDAT) pathogenesis has not been revealed completely due to the difficulty in creating an appropriate animal model. The purpose of this study was to investigate the effect of single-dose intraperitoneal (IP) induction of streptozotocin (STZ) and lipopolysaccharide (LPS) on the β-amyloid levels and the brain function of experimental rats. Eighteen rats were divided into three groups i.e. control, TRE1 (STZ 60 mg.kg-1 BW + LPS 3 mg.kg-1 BW), and TRE2 (STZ 30 mg.kg-1 BW + LPS 1.5 mg.kg-1 BW). The substances were administered in a single dose. Behavioral tests were started at day-30 after injection, we performed Morris water maze (MWM) and novel object recognition (NOR) tests. Afterward, we measured whole brain and serum β-amyloid levels, as one of the biomarkers of Alzheimer's Disease (AD), using the ELISA method. In MWM tests, the escape latency and time spent in the target quadrant of treatment groups were significantly higher than those in control at the day-5 MWM test and probe trial. The rats in treatment groups have negative discrimination indexes in NOR tasks, indicating that the rats could not remember the familiar object. Intraperitoneal STZ and LPS significantly increase soluble brain β-amyloid levels of treatment groups than those in the control group. In conclusion, the treatment of STZ (60 mg.kg-1 BW) and LPS (3 mg.kg-1 BW) indicated spatial and recognition memory impairment, along with an increase of brain soluble β-amyloid level in rats.
Functional foods containing minerals, nutrients, as well as other active ingredients are essential to support physiological functions. The Chlorophyta macroalga Ulva lactuca (“sea lettuce”) is a popular natural food source due to its abundance in intertidal zones across Indonesia. To further examine its efficacy to the human physiology, analysis of proximate composition (carbohydrate, protein, fat, crude fibre, ash, and moisture content), macronutrient (Na, P, Ca, K, and Mg), micronutrient (Fe, Mn, Cu, Zn, Co, and Cr), heavy metal (Pb, Hg, and Cd), and fatty acid contents need to be done. Results showed that the highest composition of macromolecules is carbohydrates. Macronutrients and micronutrients with the highest values are Mg and Fe, respectively, with Ca also showing a high concentration. Pb and Hg contents are considered safe, but the Cd content exceeds the safety limit regulated by BPOM 2008. The fatty acids contained include methyl octadecenoate and the unsaturated fatty acid linolelaidic methyl ester. Mg, Ca, and Fe have important roles in the body’s systems, i.e., metabolic processes, growth and development, and enzyme activation. The presence of these elements suggests U. lactuca’s potential in maintaining the body’s physiological functions; however, the relatively high content of Cd must be noted.
Arthrospira maxima and Chlorella vulgaris are contained a high protein and antioxidant levels that can be used as functional foods or supplements to improve health. Furthermore, this material needs to be monitored for safety. The aims of this research were determined the subchronic toxicity test of microalgae A. maxima and C. vulgaris on kidney function. Parameters of this research were creatinine levels, urea levels, kidney index, and histological structure of the kidney glomerular. Besides that, the progression of body weight was observed. Five teen female Wistar rats (Rattus norvegicus Berkenhout,1769) divided into three groups randomly were one control group and two treatment groups using A. maxima and C. vulgaris in the same dose were 2500 mg/kg of body weight. Subchronic toxicity test was conducted by oral gavage every day during 90 days — the measurement of creatinine levels and urea levels on the 30th, 60th, and 90th day. Kidney index and glomerular histology of rat’s kidney was prepared after necropsy at the end of this research. Base on the results, it can be concluded that consume of Arthrospira maxima, and Chlorella vulgaris at 2500 mg/kg of body weight increased creatinine and urea levels. Bodyweight, kidney index, and pathological glomerular cells of histological kidney were still in normal value.
Several physiological alterations that arise in response to hypoxemia conditions when diving are intended to protect oxygen-sensitive organs from the hypoxic condition. Hippocampus, known for its central function in memory formation, is sensitive to hypoxic conditions. This research aimed to study the effect of voluntary diving exercise (VDE) on the hippocampus-dependent learning performance of rats. Rats were divided into control and diving groups, with swim and voluntary diving exercises every day for 60 days, respectively. Observation of memory consolidation was carried out using Morris Water Maze (MWM) and Novel Object Recognition (NOR) tests. In the MWM test, the escape latencies in the diving group were shorter than those in the control group. Consistent results were obtained in the MWM probe trial which the time spent in the target quadrant was significantly longer in the diving group. Moreover, the diving group spent more time exploring the novel object in the NOR test. Based on the results, we can conclude that 60 days VDE significantly improves hippocampus-dependent learning capacity in trained rats.
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