Retinoic acid can be produced from excentric cleavage of beta-carotene in human intestinal mucosa.

Retinoic acid can be produced from excentric cleavage of beta-carotene in human intestinal mucosa.
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视黄酸可由人肠粘膜中β-胡萝卜素的偏心裂解产生。

DOI:
10.1016/0003-9861(92)90399-h
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发表时间:
1992
影响因子:
3.9
通讯作者:
Russell,RM
Russell,RM
中科院分区:
生物学3区
文献类型:
--
作者:
Wang,XD;Krinsky,NI;Tang,GW;Russell,RM

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视黄酸 (RA) 是由 β-胡萝卜素偏心裂解产生的假设在体外人肠匀浆中进行了测试。将肠粘膜匀浆与视网膜、β-胡萝卜素或β-脱胡萝卜素在 37 °C 下孵育 60 分钟后,通过 HPLC 和衍生化鉴定出大量 RA。在相同的实验条件下,当视网膜在 0.1-3.0 mm 柠檬醛(3,7-二甲基-2,6-辛二醛)存在下孵育时,RA 形成受到抑制,呈剂量依赖性。 β-胡萝卜素和β-脱脂胡萝卜素形成RA 具有剂量和时间依赖性,并且RA 是孵育后β-apo8'-胡萝卜醛和β-apo-12'-胡萝卜醛的主要代谢产物。然而,柠檬醛(0.1~4mm)并没有抑制2μmβ-胡萝卜素形成β-脱胡萝卜醛和RA(P>0.05),这证明了β-胡萝卜素转化为类维生素A存在偏心裂解机制。此外,在柠檬醛存在下,人肠匀浆中的β-apo-8'-胡萝卜醛和β-apo-12'-胡萝卜醛均形成RA,这表明RA可以通过一系列β-脱胡萝卜素作为中间体,由β-胡萝卜素偏心裂解产生。
The hypothesis that retinoic acid (RA) is produced from the excentric cleavage of β-carotene was tested in human intestinal homogenatesin vitro. Significant amounts of RA were identified by HPLC and derivatization after incubation of intestinal mucosal homogenates with retinal, β-carotene, or β-apocarotenals at 37 °C for 60 min. RA formation was inhibited, in a dose-dependent fashion, when retinal was incubated in the presence of 0.1–3.0 mmcitral (3,7-dimethyl-2,6-octadienal) under identical experimental conditions. The formation of RA from both β-carotene and β-apocarotenals was dose and time dependent and RA was the major metabolite of both β-apo8′-carotenal and β-apo- 12′-carotenal after the incubation. However, citral (0.1 to 4 mm) did not inhibit the formation of β-apocarotenals and RA from 2 μmβ-carotene (P> 0.05), which proves the existence of an excentric cleavage mechanism for β-carotene conversion into retinoids. Furthermore, RA formation from both β-apo-8′-carotenal and β-apo-12′-carotenal in human intestinal homogenate occurred in the presence of citral, which demonstrates that RA can be produced from excentric cleavage of β-carotene via a series of β-apocarotenals as intermediates.
喂食 β-胡萝卜素的兔子比不喂食 β-胡萝卜素的兔子血清中全反式视黄酸水平更高
DOI: --
发表时间: 1989
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DOI: --
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DOI: --
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