An independent regulator of global release pathways in astrocytes generates a subtype of extracellular vesicles required for postsynaptic function.

An independent regulator of global release pathways in astrocytes generates a subtype of extracellular vesicles required for postsynaptic function.
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DOI:
10.1126/sciadv.adg2067
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发表时间:
2023-06-23
期刊:
影响因子:
13.6
通讯作者:
Sockanathan, Shanthini
Sockanathan, Shanthini
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Levy-Myers, Reuben;Daudelin, Daniel;Na, Chan Hyun;Sockanathan, Shanthini

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细胞外小泡在大小、组成和功能上是不同的。我们发现,六跨膜蛋白甘油磷酸二酯磷酸二酯酶3(GDE3)调节肌动蛋白重塑,这是一种全球性的EV生物发生途径,以释放具有不同功能的EV亚型。GDE3是通过Wiskott-Aldrich综合征蛋白家族成员3(WAVE3)从质膜释放含有Annexin A1和GDE3的EV的必要条件和充分条件,WAVE3是肌动蛋白动力学的主要调节因子。GDE3在星形胶质细胞表达,但不表达神经元,然而缺乏GDE3[Gde3基因敲除(KO)]的小鼠降低了海马CA1神经元的微型兴奋性突触后电流(MEPSC)幅度。来自培养的野生型星形胶质细胞的EV可恢复Gde3KO的mEPSC波幅,而来自Gde3KO星形胶质细胞或抑制WAVE3肌动蛋白分支活性的星形胶质细胞的EV则不能。因此,GDE3-WAVE3是一个非冗余的星形细胞通路,它重塑肌动蛋白以释放功能上不同的EV亚型,支持对全球EV释放通路的独立调节在细胞EV环境中对EV信号的差异调节的概念。GDE3通过WAVE3调节肌动蛋白的动态,从星形胶质细胞释放对突触后活动至关重要的EV的一个亚型。
Extracellular vesicles (EVs) are heterogeneous in size, composition, and function. We show that the six-transmembrane protein glycerophosphodiester phosphodiesterase 3 (GDE3) regulates actin remodeling, a global EV biogenic pathway, to release an EV subtype with distinct functions. GDE3 is necessary and sufficient for releasing EVs containing annexin A1 and GDE3 from the plasma membrane via Wiskott-Aldrich syndrome protein family member 3 (WAVE3), a major regulator of actin dynamics. GDE3 is expressed in astrocytes but not neurons, yet mice lacking GDE3 [Gde3 knockout (KO)] have decreased miniature excitatory postsynaptic current (mEPSC) amplitudes in hippocampal CA1 neurons. EVs from cultured wild-type astrocytes restore mEPSC amplitudes in Gde3 KOs, while EVs from Gde3 KO astrocytes or astrocytes inhibited for WAVE3 actin branching activity do not. Thus, GDE3-WAVE3 is a nonredundant astrocytic pathway that remodels actin to release a functionally distinct EV subtype, supporting the concept that independent regulation of global EV release pathways differentially regulates EV signaling within the cellular EV landscape. GDE3 regulates actin dynamics via WAVE3 to release a subtype of EVs from astrocytes important for postsynaptic activity.
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