Pinnell S R
Yale J Biol Med. 1985 Nov-Dec;58(6):553-9.
L-ascorbic acid is an essential cofactor for lysyl hydroxylase and prolyl hydroxylase, enzymes essential for collagen biosynthesis. In addition, L-ascorbic acid preferentially stimulates collagen synthesis in a manner which appears unrelated to the effect of L-ascorbic acid on hydroxylation reactions. This reaction is stereospecific and unrelated to intracellular degradation of collagen. The effect apparently occurs at a transcriptional or translational level, since L-ascorbic acid preferentially stimulates collagen-specific mRNA. In addition, it stimulates lysyl hydroxylase activity but inhibits prolyl hydroxylase activity in human skin fibroblasts in culture.
L-抗坏血酸是赖氨酰羟化酶和脯氨酰羟化酶的必需辅助因子,这两种酶对胶原蛋白的生物合成至关重要。此外,L-抗坏血酸以一种似乎与L-抗坏血酸对羟化反应的影响无关的方式优先刺激胶原蛋白合成。该反应具有立体特异性,且与胶原蛋白的细胞内降解无关。这种作用显然发生在转录或翻译水平,因为L-抗坏血酸优先刺激胶原蛋白特异性mRNA。此外,它在培养的人皮肤成纤维细胞中刺激赖氨酰羟化酶活性,但抑制脯氨酰羟化酶活性。