Proteasome inhibitor MG132 impairs autophagic flux through compromising formation of autophagosomes in Bombyx cells

Ming Ming Ji, Jae Man Lee, Hiroaki Mon, Jian Xu, Tsuneyuki Tatsuke, Takahiro Kusakabe

研究成果: ジャーナルへの寄稿記事

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MG132 has been used as a proteasome inhibitor on Bombyx cells, but its physiological effects on autophagy still have not been elucidated. In this study, we find that the lipidated BmAtg8, BmAtg8-PE as an autophagosomal marker protein, is only localized to membranes. Then we established systems to monitor autophagic flux in Bombyx cells: Induction of autophagy reduces exogenous BmAtg8 and exogenous BmAtg8-PE, facilitates formation of autophagosomes indicated by green EGFP-BmAtg8 puncta after cotreatment by Rapamycin and Bafilomycin A1, and causes accumulation of free EGFP from EGFP-BmAtg8 cleavage in autolysosomes. Using these established systems, we find that exposure of MG132 inhibits both basal and Rapamycin-induced autophagy when polyubiquitinated proteins are accumulated markedly in Bombyx cells. Interestingly, we reveal that attenuation of autophagy in these cells is ascribed as distinct suppression of formation of autophagosomes after MG132 treatment.

元の言語英語
ページ(範囲)690-696
ページ数7
ジャーナルBiochemical and Biophysical Research Communications
479
発行部数4
DOI
出版物ステータス出版済み - 10 28 2016

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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