Keywords
Anti-Digestive Protein, Soy Protein Isolate, Rice Protein Isolate, Ovariectomy, Blood Lipids
Abstract
Objective: To study the effects of rice protein isolate and soybean protein isolate on hypercholesterolemia caused by estrogen deficiency. Methods: 24 wistar adult female rats were randomly divided into 4 groups. Rats in three groups underwent bilateral ovariectomy and were fed feed supplemented with 20% casein (control group), rice protein isolate or soy protein isolate respectively. The other group underwent pseudo-oophorectomy and were fed a control feed supplemented with 20% casein. After 4 weeks of feeding, they were dissected and the concentrations of cholesterol and triglyceride in serum and liver, as well as bile acid excretion and apparent protein digestibility in feces were measured. index. Results: Ovariectomy significantly increased cholesterol and triglyceride concentrations in serum and liver of adult female mice. Compared with the casein group, adding soy protein isolate to the feed can significantly reduce plasma total cholesterol, low-density lipoprotein and cholesterol concentration in ovariectomized rats (p<0.05), but has no significant effect on plasma triglyceride concentration. It reduces liver weight, total lipids, total cholesterol, free cholesterol and total triglycerides in the liver, and increases fecal excretion and bile acid excretion. The apparent digestibility of soy protein isolate is also significantly higher than that of casein and rice protein isolate. Rice protein isolate has no significant effect on reducing blood lipids, but the concentrations of total liver lipids, total cholesterol, free cholesterol and triglycerides are significantly lower than those of the casein feed group, while the fecal excretion, fecal bile acid excretion and apparent protein digestibility There was no significant difference from the casein group. Conclusion: Anti-digestive protein has a significant reducing effect on hypercholesterolemia caused by estrogen deficiency. The possible mechanism of action is due to the low digestibility of the protein, which interferes with bile acid metabolism in the intestine and increases the excretion of bile acids in the feces. Reduces liver and plasma cholesterol concentrations.
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Original research done by Liu Xiong, Zhang Huanrong, Chen Xuemei, Kan Jianquan, Ebi Yuanqing
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