Physiological constraint on feeding behavior: intestinal membrane disaccharidases of the starling.

Physiological constraint on feeding behavior: intestinal membrane disaccharidases of the starling.
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对摄食行为的生理限制:八哥的肠膜双糖酶。

DOI:
10.1126/science.2916126
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发表时间:
1989
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Stevens,BR
Stevens,BR
中科院分区:
--
文献类型:
--
作者:
MartinezdelRio,C;Stevens,BR

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动物显然可以选择它们吃的东西,甚至可以在化学性质不同的糖中进行选择。限制摄食选择的生理和生化机制在很大程度上是未知的。在这项研究中,欧洲椋鸟(Sturnus vulgaris)的首选混合溶液的D-葡萄糖和D-果糖等摩尔(双摩尔热值)的蔗糖溶液。蔗糖的插管喂养没有增加血糖水平。蔗糖对这些鸟类来说是一种无用的能量来源,因为它们的小肠刷状缘膜上缺乏单一的消化酶(蔗糖酶)。然而,膜具有单独的麦芽糖酶和异麦芽糖酶二糖苷酶。这种表达模式和表达模式的膜dispensidases哺乳动物之间的肠道酶的脊椎动物和它们的植物食物来源之间的共同进化的相互作用中的作用。
Animals clearly choose what they eat and can even choose among chemically different sugars. The physiological and biochemical mechanisms that constrain feeding choices are largely unknown. In this study, European starlings (Sturnus vulgaris) preferred mixture solutions of D-glucose plus D-fructose to equimolar (double molar caloric value) solutions of sucrose. Intubation feeding of sucrose did not increase blood glucose levels. Sucrose is a useless energy source for these birds because they lack a single digestive enzyme (sucrase) on the small intestinal brush border membrane. However, the membranes possessed separate maltase and isomaltase disaccharidases. This expression pattern and expression patterns of membrane disaccharidases among mammals suggest a role for intestinal enzymes in the coevolutionary interactions between vertebrates and their plant food sources.
DOI: 10.1016/s0021-9258(17)42927-9
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影响因子: --
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