摘要
本文通过对幼年大鼠骨骼肌细胞RNA相对含量的显微分光测定和尿中3-甲基组氨酸的分析,观察了不同质量饲料蛋白质对大鼠骨骼肌蛋白质代谢的影响。结果显示,不同质量的蛋白质喂养动物,动物骨骼肌细胞RNA含量存在显著差异,RNA含量与饲料蛋白质的氨基酸分之间呈高度正相关(r=0.958);尿中3-甲基组氨酸排出量也随饲料蛋白质质量提高而增大。据此认为,优质蛋白质促进动物生长发育,主要是加强了机体蛋白质的合成代谢,而不是降低了分解代谢。
The experimental rats were fed with 5 test diets of different protein quality.RNA content and 3-methylhistidhie(3-MH) in urine were determined.The results showed that the RNA content of the skeletl muscle cells was significantly different in rais fed with different diet.A linear correlation between RNA content and amino acid score of food protein was perceived.Food with the higher protein quality,the more 3-MH in urine was excreted.A good correlation between excrstiou of 3-MH and Net Portein Utilization(NPU),an index reflecting protein quality,existed too.These suggested that protein quality regulates the balance between auabolism and catabolism,meaning the turnover of skeletal muscle proteinThe mechanism of strengthening anabolism,not reducing catabolism,can explain that high protein quality could improve growth of animals.
出处
《第三军医大学学报》
CAS
CSCD
北大核心
1989年第1期39-42,共4页
Journal of Third Military Medical University
关键词
肌蛋白
蛋白
骨骼肌
饮食分析
Food analysis
Muscle proteins
3-methylhistidine
RNA
