Age-related changes in scavenger receptor-mediated endocytosis in rat liver sinusoidal endothelial cells.

Age-related changes in scavenger receptor-mediated endocytosis in rat liver sinusoidal endothelial cells.
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大鼠肝窦内皮细胞清道夫受体介导的内吞作用的年龄相关变化。

DOI:
10.1093/gerona/glq108
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发表时间:
2010
期刊:
The journals of gerontology. Series A, Biological sciences and medical sciences
影响因子:
--
通讯作者:
Sørensen,KarenKristine
Sørensen,KarenKristine
中科院分区:
--
文献类型:
--
作者:
Simon-Santamaria,Jaione;Malovic,Ivana;Warren,Alessandra;Oteiza,Ana;LeCouteur,David;Smedsrød,Bård;McCourt,Peter;Sørensen,KarenKristine

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肝窦内皮细胞(LSECs)通过有效地内吞血液中的废物大分子,在全身废物清除中发挥着重要作用。我们的目的是研究F344/BN F1大鼠衰老过程中LSECs的清道夫功能,以及与年龄相关的形态变化(如去窗)是否影响这一功能。老年大鼠LSECs经甲醛处理后,清道夫受体配体的内吞作用明显降低。在年轻和老年,甲醛处理的血清白蛋白内吞作用的主要清道夫受体稳定蛋白-1和稳定蛋白-2的配体降解、LSEC蛋白表达及其沿肝窦的染色模式在年轻和老年时相似,表明内吞机制的其他部分受到衰老的影响。经甲醛处理的每个细胞的白蛋白摄取率和通过电子显微镜评估的细胞孔隙度之间没有相关性,这表明LSEC去窗与内吞作用受损无关。我们报告在老年时LSEC的内吞能力显著降低,这在循环废物负荷增加的情况下可能特别重要。
Liver sinusoidal endothelial cells (LSECs) play an essential role in systemic waste clearance by effective endocytosis of blood-borne waste macromolecules. We aimed to study LSECs’ scavenger function during aging, and whether age-related morphological changes (eg, defenestration) affect this function, in F344/BN F1 rats. Endocytosis of the scavenger receptor ligand formaldehyde-treated serum albumin was significantly reduced in LSECs from old rats. Ligand degradation, LSEC protein expression of the major scavenger receptors for formaldehyde-treated serum albumin endocytosis, stabilin-1 and stabilin-2, and their staining patterns along liver sinusoids, was similar at young and old age, suggesting that other parts of the endocytic machinery are affected by aging. Formaldehyde-treated serum albumin uptake per cell, and cell porosity evaluated by electron microscopy, was not correlated, indicating that LSEC defenestration is not linked to impaired endocytosis. We report a significantly reduced LSEC endocytic capacity at old age, which may be especially important in situations with increased circulatory waste loads.
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影响因子: --
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影响因子: 7.8
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DOI: --
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