Endocytic BDNF secretion regulated by Vamp3 in astrocytes

Posted: 2021-10-28 19:00:00
Brain-derived neurotrophic factor (BDNF) regulates diverse brain functions via TrkB receptor signaling. Due to the expression of TrkB receptors, astrocytes can internalize extracellular BDNF proteins via receptor-mediated endocytosis. Endocytosed BDNF can be re-secreted upon stimulation, but the molecular mechanism underlying this phenomenon remains unrecognized. Our study reveals that vesicle-associated membrane protein 3 (Vamp3) selectively regulates the release of endocytic BDNF from astrocytes. By using quantum dot (QD)-conjugated mature BDNF (QD-BDNF) as a proxy for the extracellular BDNF protein, we monitored the uptake, transport, and secretion of BDNF from cultured cortical astrocytes. Our data showed that endocytic QD-BDNF particles were enriched in Vamp3-containing vesicles in astrocytes and that ATP treatment sufficiently triggered either the antero- or retrograde transport and exocytosis of QD-BDNF-containing vesicles. Downregulation of Vamp3 expression disrupted endocytic BDNF secretion from astrocytes but did not affect uptake or transport. Collectively, these results provide evidence of the selective ability of astrocytic Vamp3 to control endocytic BDNF secretion during BDNF recycling.

参考サイト PubMed: exsome

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5月 19, 2021 バイオアソシエイツ


ミネソタ大学医学部の研究チームは、米国で毎年5万人以上が死亡している末期の大腸癌を標的として治療するための新たな方法を発見した。研究チームは、大腸癌細胞が抗腫瘍免疫反応を回避する新たなメカニズムを発見し、"エクソソーム"を用いた治療戦略の開発に役立てた。2021年4月22日にGastroenterology誌のオンラインで公開されたこの論文は、「腫瘍分泌細胞外小胞はT細胞の共刺激を制御し、腫瘍特異的T細胞応答を誘導するように操作できる(Tumor Secreted Extracellular Vesicles…

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