Objective To investigate the pretreatment effects of Rhodiola rosea （R. rosea） extract on cognitive dysfunction, oxidative stress in hippocampus and hippocampal neuron injury in a rat model of Alzheimer＇s disease ...Objective To investigate the pretreatment effects of Rhodiola rosea （R. rosea） extract on cognitive dysfunction, oxidative stress in hippocampus and hippocampal neuron injury in a rat model of Alzheimer＇s disease （AD）. Methods Male Sprague-Dawley rats were pretreated with R. rosea extract at doses of 1.5, 3.0, and 6.0 g/kg for 3 weeks, followed by bilateral intracerebroventricular injection with streptozotocin （1.5 mg/kg） on days 1 and 3. Behavioral alterations were monitored after 2 weeks from the lesion using Morris water maze task. Three weeks after the lesion, the rats were sacrificed for measuring the malondialdehyde （MDA）, glutathione reductase （GR） and reduced glutathione （GSH） levels in hippocampus and histopathology of hippocampal neurons. Results The MDA level was significantly increased while the GR and GSH levels were significantly decreased with striking impairments in spatial learning and memory and severe damage to hippocampal neurons in the model rat induced by intracerebroventricular injection of streptozotocin. These abnormalities were significantly improved by pretreatment with R. rosea extract （3.0 g/kg）. Conclusion R. rosea extract can protect rats against cognitive deficits, neuronal injury and oxidative stress induced by intracerebroventricular injection of streptozotocin, and may be used as a potential agent in treatment of neurodegenerative diseases such as AD.展开更多
In our previous study, we found that the edible alcohol extract of the root of the medicinal plant Rhodiola crenulata（RCE） improved spatial cognition in a rat model of Alzheimer＇s disease. Another study from our la...In our previous study, we found that the edible alcohol extract of the root of the medicinal plant Rhodiola crenulata（RCE） improved spatial cognition in a rat model of Alzheimer＇s disease. Another study from our laboratory showed that RCE enhanced neural cell proliferation in the dentate gyrus of the hippocampus and prevented damage to hippocampal neurons in a rat model of chronic stress-induced depression. However, the mechanisms underlying the neuroprotective effects of RCE are unclear. In the present study, we investigated the anti-apoptotic effect of RCE and its neuroprotective mechanism of action in a rat model of Alzheimer＇s disease established by intracerebroventricular injection of streptozotocin. The rats were pre-administered RCE at doses of 1.5, 3.0 or 6.0 g/kg for 21 days before model establishment. ATP and cytochrome c oxidase levels were significantly decreased in rats with Alzheimer＇s disease. Furthermore, neuronal injury was obvious in the hippocampus, with the presence of a large number of apoptotic neurons. In comparison, in rats given RCE pretreatment, ATP and cytochrome c oxidase levels were markedly increased, the number of apoptotic neurons was reduced, and mitochondrial injury was mitigated. The 3.0 g/kg dose of RCE had the optimal effect. These findings suggest that pretreatment with RCE prevents mitochondrial dysfunction and protects hippocampal neurons from apoptosis in rats with Alzheimer＇s disease.展开更多
Liver cancer is the fifth most common cancer and the third leading cause of cancer death globally. Malnutrition is found in 65-90% of patients with liver cancer and often enhances cancer occurrence and complications, ...Liver cancer is the fifth most common cancer and the third leading cause of cancer death globally. Malnutrition is found in 65-90% of patients with liver cancer and often enhances cancer occurrence and complications, deteriorates liver functions, and promotes early development of refractory ascites and hepatic encephalopathy (HE), increasing both morbidity and mortality. Malnutrition may develop as a result of poor dietary intake, anorexia, medications, side effects to chemotherapy, encephalopathy, as well as socioeconomic limitations. A dedicated clinical team should provide proper assessment of patient’s nutritional status and nutrition supplemental plan to restore liver health and prevent or treat malnutrition. Nutrition assessment is based on medical, nutritional, and medication histories, physical examination for body composition and signs of malnutrition, anthropometric measurements, radio-imaging, laboratory tests, and flow charts or algorithms on patient’s dietary intake and changes in bodyweight. Clinical management depends on patient’s disease and nutritional status. Patients with minor liver affection or compensated liver cirrhosis may have normal diet without any restrictions in carbohydrates, proteins, and fat, but preferably take other supplements supporting the liver. Patients with decompensated liver should consume 25-40 kcal/kg/day and 1.0-1.5 g protein/kg/day. For patients with acute episodes of HE, a temporary protein restriction of 0.6-0.8 g/kg/day should be implemented until HE is eliminated. Patients should consume small, frequent meals throughout the day and add a carbohydrate- and protein-rich evening snack. Other approaches to supporting optimal digestion and nutrition and managing side effects of cancer therapies may be added as well.展开更多
文摘Objective To investigate the pretreatment effects of Rhodiola rosea （R. rosea） extract on cognitive dysfunction, oxidative stress in hippocampus and hippocampal neuron injury in a rat model of Alzheimer＇s disease （AD）. Methods Male Sprague-Dawley rats were pretreated with R. rosea extract at doses of 1.5, 3.0, and 6.0 g/kg for 3 weeks, followed by bilateral intracerebroventricular injection with streptozotocin （1.5 mg/kg） on days 1 and 3. Behavioral alterations were monitored after 2 weeks from the lesion using Morris water maze task. Three weeks after the lesion, the rats were sacrificed for measuring the malondialdehyde （MDA）, glutathione reductase （GR） and reduced glutathione （GSH） levels in hippocampus and histopathology of hippocampal neurons. Results The MDA level was significantly increased while the GR and GSH levels were significantly decreased with striking impairments in spatial learning and memory and severe damage to hippocampal neurons in the model rat induced by intracerebroventricular injection of streptozotocin. These abnormalities were significantly improved by pretreatment with R. rosea extract （3.0 g/kg）. Conclusion R. rosea extract can protect rats against cognitive deficits, neuronal injury and oxidative stress induced by intracerebroventricular injection of streptozotocin, and may be used as a potential agent in treatment of neurodegenerative diseases such as AD.
基金supported by grants of the Administrative Bureau of Chinese Traditional Medicine of Guangdong Province of China,No.2007109the Medical Research Foundation of Guangdong Province of China,No.A20111154
文摘In our previous study, we found that the edible alcohol extract of the root of the medicinal plant Rhodiola crenulata（RCE） improved spatial cognition in a rat model of Alzheimer＇s disease. Another study from our laboratory showed that RCE enhanced neural cell proliferation in the dentate gyrus of the hippocampus and prevented damage to hippocampal neurons in a rat model of chronic stress-induced depression. However, the mechanisms underlying the neuroprotective effects of RCE are unclear. In the present study, we investigated the anti-apoptotic effect of RCE and its neuroprotective mechanism of action in a rat model of Alzheimer＇s disease established by intracerebroventricular injection of streptozotocin. The rats were pre-administered RCE at doses of 1.5, 3.0 or 6.0 g/kg for 21 days before model establishment. ATP and cytochrome c oxidase levels were significantly decreased in rats with Alzheimer＇s disease. Furthermore, neuronal injury was obvious in the hippocampus, with the presence of a large number of apoptotic neurons. In comparison, in rats given RCE pretreatment, ATP and cytochrome c oxidase levels were markedly increased, the number of apoptotic neurons was reduced, and mitochondrial injury was mitigated. The 3.0 g/kg dose of RCE had the optimal effect. These findings suggest that pretreatment with RCE prevents mitochondrial dysfunction and protects hippocampal neurons from apoptosis in rats with Alzheimer＇s disease.
文摘Liver cancer is the fifth most common cancer and the third leading cause of cancer death globally. Malnutrition is found in 65-90% of patients with liver cancer and often enhances cancer occurrence and complications, deteriorates liver functions, and promotes early development of refractory ascites and hepatic encephalopathy (HE), increasing both morbidity and mortality. Malnutrition may develop as a result of poor dietary intake, anorexia, medications, side effects to chemotherapy, encephalopathy, as well as socioeconomic limitations. A dedicated clinical team should provide proper assessment of patient’s nutritional status and nutrition supplemental plan to restore liver health and prevent or treat malnutrition. Nutrition assessment is based on medical, nutritional, and medication histories, physical examination for body composition and signs of malnutrition, anthropometric measurements, radio-imaging, laboratory tests, and flow charts or algorithms on patient’s dietary intake and changes in bodyweight. Clinical management depends on patient’s disease and nutritional status. Patients with minor liver affection or compensated liver cirrhosis may have normal diet without any restrictions in carbohydrates, proteins, and fat, but preferably take other supplements supporting the liver. Patients with decompensated liver should consume 25-40 kcal/kg/day and 1.0-1.5 g protein/kg/day. For patients with acute episodes of HE, a temporary protein restriction of 0.6-0.8 g/kg/day should be implemented until HE is eliminated. Patients should consume small, frequent meals throughout the day and add a carbohydrate- and protein-rich evening snack. Other approaches to supporting optimal digestion and nutrition and managing side effects of cancer therapies may be added as well.
