首页> 外文期刊>American Journal of Physiology >Ascorbic acid-independent synthesis of collagen in mice.
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Ascorbic acid-independent synthesis of collagen in mice.

机译:小鼠抗胶原蛋白的抗坏血酸合成。

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The mouse has become the most important model organism for the study of human physiology and disease. However, until the recent generation of mice lacking the enzyme gulanolactone oxidase (Gulo), the final enzyme in the ascorbic acid biosynthesis pathway, examination of the role of ascorbic acid in various biochemical processes using this model organism has not been possible. In the mouse, similar to most mammals but unlike humans who carry a mutant copy of this gene, Gulo produces ascorbic acid from glucose. We report here that, although ascorbic acid is essential for survival, its absence does not lead to measurable changes in proline hydroxylation. Vitamin C deficiency had no significant effect on the hydroxylation of proline and collagen production during tumor growth or in angiogenesis associated with tumor or mammary gland growth. This suggests that factors other than ascorbic acid can support proline hydroxylation and collagen synthesis in vivo. Furthermore, the failure of Gulo-/- mice to thriveon a vitamin C-deficient diet therefore suggests that ascorbic acid plays a critical role in survival other than the maintenance of the vasculature.
机译:小鼠已成为研究人类生理和疾病的最重要的模型生物。但是,直到最近的小鼠缺少抗坏血酸生物合成途径中的最终酶古洛糖内酯氧化酶(Gulo)为止,尚无法使用该模型生物检查抗坏血酸在各种生化过程中的作用。在老鼠中,与大多数哺乳动物相似,但与携带该基因突变拷贝的人类不同,Gulo从葡萄糖中产生抗坏血酸。我们在这里报告,尽管抗坏血酸对于生存至关重要,但其缺乏不会导致脯氨酸羟基化程度的可测量变化。维生素C缺乏对肿瘤生长期间或与肿瘤或乳腺生长相关的血管生成中脯氨酸的羟化和胶原蛋白生成没有明显影响。这表明抗坏血酸以外的其他因素也可以在体内支持脯氨酸羟化和胶原合成。此外,因此,Gulo-/-小鼠未能补充缺乏维生素C的饮食,这表明抗坏血酸在生存中起着至关重要的作用,而不是维持脉管系统。

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