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首页> 外文期刊>Canadian Journal of Animal Science >Differential regulation of components of the apoptotic and ubiquitin-mediated proteolytic pathway in slow- and fast-twitch muscle type in lambs receiving increasing amounts of dietary non-structural carbohydrate.
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Differential regulation of components of the apoptotic and ubiquitin-mediated proteolytic pathway in slow- and fast-twitch muscle type in lambs receiving increasing amounts of dietary non-structural carbohydrate.

机译:接受越来越多的饮食非结构性碳水化合物的羔羊的慢肌和快肌类型的凋亡和泛素介导的蛋白水解途径的成分的差异调节。

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摘要

Non-fibre carbohydrate (NFC) rich diets are commonly fed in ruminant production systems. The objective was to determine whether NFC challenge affects proteasome activity, or messenger ribonucleic acid (mRNA) expression of proteasome subunits or apoptotic Bcl-2 proteins, in slow- or fast-twitch muscle of sheep. For 12 d prior to slaughter, lambs (n=8) received either a control diet (28.4% of dry matter as grain), or a diet of increasing amounts of grain up to 79.1% of dry matter. A decrease in urinary pH (P=0.01), base excess of blood and extracellular fluid (P=0.01), bicarbonate (P=0.03) and total carbon dioxide (P=0.04), and an increase in anion gap (P=0.07) in NFC lambs are indicative of metabolic acidosis. NFC lambs had significantly lower mRNA expression of the 20S- beta subunit (P=0.05), and a tendency toward lower mRNA expression of the 20S- alpha subunit (P=0.11) and the 19S isoform (P=0.15) in soleus, but not to the same extent in extensor digitorum longus (EDL) muscle. Downregulation of Bad mRNA expression occurred in both soleus (P=0.10) and EDL (P=0.08) muscle as a result of NFC challenge. These results indicate that NFC challenge does affect mRNA expression of genes related to the proteasome and apoptosis in a muscle specific manner.
机译:非纤维碳水化合物(NFC)丰富的饮食通常在反刍动物生产系统中饲喂。目的是确定NFC攻击是否影响绵羊慢速或快速抽搐肌肉中的蛋白酶体活性或蛋白酶体亚基或凋亡性Bcl-2蛋白的信使核糖核酸(mRNA)表达。宰杀前12天,羔羊( n = 8)接受对照饮食(占谷物干物质的28.4%),或接受谷物增加至干物质含量的79.1%的饮食。尿液pH值降低( P = 0.01),血液和细胞外液基本过量( P = 0.01),碳酸氢盐( P = 0.03) )和总二氧化碳( P = 0.04),以及NFC羔羊中阴离子间隙的增加( P = 0.07)指示代谢性酸中毒。 NFC羔羊的20S-β亚基的mRNA表达显着较低( P = 0.05),并且具有20S-α亚基的mRNA表达较低的趋势( P = 0.11) )和比目鱼肌中的19S同种型( P = 0.15),但在趾长伸肌(EDL)肌肉中的程度不同。 NFC刺激导致比目鱼肌( P = 0.10)和EDL( P = 0.08)肌肉中Bad mRNA表达的下调。这些结果表明,NFC激发确实以肌肉特异性的方式影响与蛋白酶体和细胞凋亡相关的基因的mRNA表达。

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