Autophagy proteins regulate the secretory component of osteoclastic bone resorption.

Autophagy proteins regulate the secretory component of osteoclastic bone resorption.
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DOI:
10.1016/j.devcel.2011.08.016
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发表时间:
2011-11-15
期刊:
影响因子:
11.8
通讯作者:
Virgin, Herbert W.
Virgin, Herbert W.
中科院分区:
生物学1区
文献类型:
--
作者:
DeSelm, Carl J.;Miller, Brian C.;Zou, Wei;Beatty, Wandy L.;van Meel, Helena;Takahata, Yoshifumi;Klumperman, Judith;Tooze, Sharon A.;Teitelbaum, Steven L.;Virgin, Herbert W.

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破骨细胞通过皱褶边界吸收骨,皱褶边界是由分泌性溶酶体与骨相关的质膜融合而产生的。溶酶体与质膜的融合导致吸收微环境的酸化和CatK的释放,以消化骨的有机基质。分泌溶酶体被引导与皱褶边缘融合的方式是神秘的。我们发现自噬所必需的蛋白质包括Atg5、Atg7、Atg4B和LC3,在体外和体内对破骨细胞褶边的产生、破骨细胞的分泌功能和骨吸收都很重要。此外,破骨细胞功能所需的Rab7以依赖于atg5的方式定位于皱褶边界。因此,自噬蛋白通过引导溶酶体与质膜融合,参与溶酶体内容物向细胞外空间的极化分泌。这些发现与自噬基因与人类骨骼稳态之间的假定联系保持一致。
Osteoclasts resorb bone via the ruffled border whose complex folds are generated by secretory lysosome fusion with bone-apposed plasma membrane. Lysosomal fusion with the plasmalemma results in acidification of the resorptive microenvironment and release of CatK to digest the organic matrix of bone. The means by which secretory lysosomes are directed to fuse with the ruffled border are enigmatic. We show that proteins essential for autophagy including Atg5, Atg7, Atg4B and LC3, are important for generating the osteoclast ruffled border, the secretory function of osteoclasts and bone resorption in vitro and in vivo. Further, Rab7 which is required for osteoclast function, localizes to the ruffled border in an Atg5-dependent manner. Thus, autophagy proteins participate in polarized secretion of lysosomal contents into the extracellular space by directing lysosomes to fuse with the plasma membrane. These findings are in keeping with a putative link between autophagy genes and human skeletal homeostasis.
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