Amassin, an olfactomedin protein, mediates the massive intercellular adhesion of sea urchin coelomocytes.

Amassin, an olfactomedin protein, mediates the massive intercellular adhesion of sea urchin coelomocytes.
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DOI:
10.1083/jcb.200210053
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发表时间:
2003-02-17
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Vacquier VD
Vacquier VD
中科院分区:
其他
文献类型:
--
作者:
Hillier BJ;Vacquier VD

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海胆有一个充满液体的体腔,体腔中含有四种称为体腔细胞的免疫细胞。在体腔液从体腔中取出后的几分钟内,体腔细胞发生大量的细胞-细胞粘附。该事件称为凝血。凝血被认为是一种防御机制,防止体腔液的损失,如果体壁被刺穿,它也可能在细胞包裹异物和微生物。在这里,我们表明,这intercoelomocyte粘附介导的amassin,体腔血浆蛋白的相对分子质量(MR)为75 kD。Amassin形成大的二硫键结合的聚集体,使体腔细胞彼此粘附。阿马辛蛋白的一半包含嗅觉调节蛋白(OLF)结构域。结构预测表明,amassin和其他OLF结构域含有脊椎动物蛋白质共享一个共同的架构。这表明OLF家族的其他蛋白质可能在细胞间粘附中发挥作用。这些发现首次证明了OLF家族蛋白的功能。
Sea urchins have a fluid-filled body cavity, the coelom, containing four types of immunocytes called coelomocytes. Within minutes after coelomic fluid is removed from the body cavity, a massive cell–cell adhesion of coelomocytes occurs. This event is referred to as clotting. Clotting is thought to be a defense mechanism against loss of coelomic fluid if the body wall is punctured, and it may also function in the cellular encapsulation of foreign material and microbes. Here we show that this intercoelomocyte adhesion is mediated by amassin, a coelomic plasma protein with a relative molecular mass (M r) of 75 kD. Amassin forms large disulfide-bonded aggregates that adhere coelomocytes to each other. One half of the amassin protein comprises an olfactomedin (OLF) domain. Structural predictions show that amassin and other OLF domain-containing vertebrate proteins share a common architecture. This suggests that other proteins of the OLF family may function in intercellular adhesion. These findings are the first to demonstrate a function for a protein of the OLF family.
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