Dual roles for hepatic lectin receptors in the clearance of chilled platelets.

Dual roles for hepatic lectin receptors in the clearance of chilled platelets.
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肝凝集素受体的双重作用在冷冻血小板的清除率中。

DOI:
10.1038/nm.2030
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发表时间:
2009-11
期刊:
影响因子:
82.9
通讯作者:
--
中科院分区:
医学1区
文献类型:
--
作者:

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快速冷却(<4小时)血小板上的糖蛋白- (GP)Ib受体簇和肝巨噬细胞的ß2整合素结合簇中的ßGlcNAc残基,导致输血后急性冷却血小板的快速清除。尽管通过半乳糖基化来限制ßGlcNAc部分可以阻止清除,但这种策略在长时间(bb0 - 24小时)冷藏后无效。我们在这里报道,长时间的冷藏增加了暴露的半乳糖残留物的密度/浓度,使得肝细胞越来越多地参与血小板的清除,利用他们的阿什韦尔-莫雷尔受体。巨噬细胞总是能迅速清除大量输注血小板(约40%)。随着血小板冷却,肝细胞依赖性清除进一步减少输血后的恢复。
Chilling rapidly (<4 h) clusters Glycoprotein - (GP)Ib receptors on blood platelets, and ß2-integrins of hepatic macrophages bind ßGlcNAc residues in the clusters leading to rapid clearance of acutely chilled platelets following transfusion. Although capping the ßGlcNAc moieties by galactosylation prevents clearance, this strategy is ineffective after prolonged (>24 h) refrigeration. We report here that prolonged refrigeration increases the density/concentration of exposed galactose residues such that hepatocytes become increasingly involved in the removal of platelets using their Ashwell-Morell receptors. Macrophages always rapidly remove a large fraction of transfused platelets (~40%). With platelet cooling, hepatocyte-dependent clearance further diminishes their recoveries following transfusion.
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