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关于绵羊对日粮胆碱在消化道吸收前几乎完全被微生物破坏的不敏感性。

On the insensitivity of sheep to the almost complete microbial destruction of dietary choline before alimentary-tract absorption.

作者信息

Dawson R M, Grime D W, Lindsay D B

出版信息

Biochem J. 1981 May 15;196(2):499-504. doi: 10.1042/bj1960499.

Abstract
  1. Injection of [Me-14C]choline into sheep indicated that the small amount of phosphatidylcholine present in abomasal digesta was largely (69%) of non-dietary or ruminal origin. 2. Long-term feeding of [Me-3H]choline to sheep produced insignificant labelling of plasma phosphatidylcholine, indicating that more than 99% of the choline body pool was of non-dietary origin. 3. In contrast, when rats were fed with [Me-3H]choline for similar periods, 18-54% of the tissue phosphatidylcholine was derived from dietary choline. 4. The loss of [14C]choline and 32P from the plasma phosphatidylcholine after a single injection of these isotopes indicated a markedly slower turnover of choline in the sheep compared with the rat. This observation, coupled with a lack of liver glycerophosphocholine diesterase, provides an explanation for the insensitivity of the sheep to an almost complete microbial destruction of dietary choline before alimentary-tract absorption.
摘要
  1. 向绵羊注射[甲基 - 14C]胆碱表明,皱胃消化物中存在的少量磷脂酰胆碱大部分(69%)来自非饮食或瘤胃来源。2. 长期给绵羊饲喂[甲基 - 3H]胆碱对血浆磷脂酰胆碱的标记作用不明显,表明胆碱体内池超过99%来自非饮食来源。3. 相比之下,当给大鼠饲喂[甲基 - 3H]胆碱相同时间时,18 - 54%的组织磷脂酰胆碱来自饮食中的胆碱。4. 单次注射这些同位素后,血浆磷脂酰胆碱中[14C]胆碱和32P的损失表明,与大鼠相比,绵羊体内胆碱的周转明显更慢。这一观察结果,再加上缺乏肝脏甘油磷酸胆碱二酯酶,为绵羊对饮食中胆碱在消化道吸收前几乎完全被微生物破坏不敏感提供了解释。

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Liver glycerylphosphorylcholine diesterase.肝脏甘油磷酸胆碱二酯酶
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