The lipocalin XLCpl1 expressed in the neural plate of Xenopus laevis embryos is a secreted retinaldehyde binding protein

The lipocalin XLCpl1 expressed in the neural plate of Xenopus laevis embryos is a secreted retinaldehyde binding protein
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非洲爪蟾胚胎神经板中表达的脂质运载蛋白 XLCpl1 是一种分泌性视黄醛结合蛋白

DOI:
10.1002/pro.5560050704
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发表时间:
1996
期刊:
影响因子:
8
通讯作者:
Hannes Flöckner
Hannes Flöckner
中科院分区:
生物学3区
文献类型:
--
作者:
G. Lepperdinger;B. Strobl;Anita Weber;C. Mollay;A. Jilek;J. Thalhamer;Hannes Flöckner

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研究了非洲爪蟾胚胎早期神经板和成年脉络丛中表达的脂质运载蛋白的细胞和结构特性以及结合能力。据发现,这种脂质运载蛋白,称为Xlceptin,在纳摩尔浓度下结合视黄醇,在微摩尔范围内结合视黄酸,但不显示与视黄醇的结合。此外,该蛋白质还结合D/L甲状腺素。使用牛痘病毒表达系统在细胞培养物中表达Xlcpl1 cDNA。在AtT20细胞中,Xlcpl 1通过组成性分泌途径分泌。因此,我们假设cpl 1在通过被认为是类维生素A的储存室的分泌途径的隔室的运输过程中结合视黄醇。因此,表达cnc的细胞将分泌活性类维生素A的前体,如视黄酸异构体。这些类维生素A可通过扩散或受体控制机制进入细胞溶质,如外源性应用的类维生素A所示。基于这些数据,我们认为cpl1是维甲酸信号通路的一个组成部分,因此,它在胚胎发育早期的模式形成中起着关键作用。
The cellular and structural properties and binding capabilities of a lipocalin expressed in the early neural plate of Xenopus laevis embryos and the adult choroid plexus have been investigated. It was found that this lipocalin, termed Xlcpll, binds retinal at a nanomolar concentration, retinoic acid in the micromolar range, but does not show binding to retinol. Furthermore, this protein also binds D/L thyroxine. The Xlcpl1 cDNA was expressed in cell culture using the vaccinia virus expression system. In AtT20 cells, Xlcpl1 was secreted via the constitutive secretory pathway. We therefore assume that cpl1 binds retinaldehyde during the transport through the compartments of the secretory pathway that are considered to be the storage compartments of retinoids. Therefore, cpll‐expressing cells will secrete the precursors of active retinoids such as retinoic acid isomers. These retinoids may enter the cytosol by diffusion or receptor‐controlled mechanisms, as has been shown for exogenously applied retinoids. Based on these data, it is suggested that cpl1 is an integral member of the retinoid signaling pathway and, therefore, it plays a key role in pattern formation in early embryonic development.
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