The hyaluronan receptor for endocytosis (HARE) is not CD44 or CD54 (ICAM-1).

The hyaluronan receptor for endocytosis (HARE) is not CD44 or CD54 (ICAM-1).
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内吞作用透明质酸受体 (HARE) 不是 CD44 或 CD54 (ICAM-1)。

DOI:
10.1016/s0006-291x(02)00558-2
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发表时间:
2002
影响因子:
3.1
通讯作者:
Weigel,PaulH
Weigel,PaulH
中科院分区:
生物学4区
文献类型:
--
作者:
Weigel,JanetA;Raymond,RobertC;Weigel,PaulH

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哺乳动物肝脏含有内吞、再循环受体,其介导透明质酸(HA)和硫酸软骨素从循环中的清除。McCourt等人[J. Biol. Chem. 269(1994)30081]先前报道了这种内吞性肝HA受体是ICAM-1。相反,我们从大鼠肝窦内皮细胞(LEC)中纯化了这种用于内吞作用的HA受体(HARE),并获得了两种新的大蛋白[Zhou et al.,J.Biol.Chem.274(1999)33831]。本研究的目的是澄清这种不一致性,并确定CD 44(也是HA受体)或ICAM-1(CD 54)是否与HARE相同或是HARE的一部分。虽然离体肝LEC含有HARE,CD 44和ICAM-1,共聚焦荧光显微镜显示,后两种蛋白质的细胞分布是不同的,基本上不重叠的HARE。培养的LEC的HA积累被抗HARE的抗体抑制>98%,并且不受ICAM-1或CD 44的抗体的影响,这表明几乎所有的特异性HA摄取都是由HARE介导的,而不是由ICAM-1或CD 44介导的。最后,在使用CD 44或ICAM-1抗体的基于ELISA的测定中未观察到针对纯化的HARE的反应性。结果证实哺乳动物内吞HA受体是HARE,而不是ICAM-1或CD 44。
Mammalian liver contains an endocytic, recycling receptor that mediates the clearance of hyaluronan (HA) and chondroitin sulfate from the circulation. McCourt et al. [J. Biol. Chem. 269 (1994) 30081] previously reported that this endocytic liver HA receptor was ICAM-1. In contrast, we purified this HA receptor for endocytosis (HARE) from rat liver sinusoidal endothelial cells (LECs) and obtained two novel large proteins [Zhou et al., J. Biol. Chem. 274 (1999) 33831]. The goal of the present study was to clarify this inconsistency and determine whether CD44, which is also an HA receptor, or ICAM-1 (CD54) is identical to, or is part of, HARE. Although isolated liver LECs contain HARE, CD44, and ICAM-1, confocal fluorescence microscopy showed that the two latter proteins have cellular distributions that are distinct from and essentially nonoverlapping with HARE. HA accumulation by cultured LECs was inhibited >98% by an antibody against HARE and unaffected by antibodies to ICAM-1 or CD44, indicating that virtually all specific HA uptake is mediated by HARE and not by ICAM-1 or CD44. Finally, no reactivity was observed against purified HARE in an ELISA-based assay using CD44 or ICAM-1 antibodies. The results confirm that the mammalian endocytic HA receptor is HARE and is not ICAM-1 or CD44.
大鼠 175-kDa 透明质酸受体内吞作用的分子克隆和功能表达。
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发表时间: 2002
影响因子: 3.3
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