論文 - 詳細
| RRC ID | 82527 |
|---|---|
| 著者 | Kim HK, Lee GH, Bhattarai KR, Lee MS, Back SH, Kim HR, Chae HJ. |
| タイトル | TMBIM6 (transmembrane BAX inhibitor motif containing 6) enhances autophagy through regulation of lysosomal calcium. |
| ジャーナル | Autophagy |
| Abstract |
Lysosomal Ca2+ contributes to macroautophagy/autophagy, an intracellular process for the degradation of cytoplasmic material and organelles in the lysosomes to protect cells against stress responses. TMBIM6 (transmembrane BAX inhibitor motif containing 6) is a Ca2+ channel-like protein known to regulate ER stress response and apoptosis. In this study, we examined the as yet unknown role of TMBIM6 in regulating lysosomal Ca2+ levels. The Ca2+ efflux from the ER through TMBIM6 was found to increase the resting lysosomal Ca2+ level, in which ITPR-independent regulation of Ca2+ status was observed. Further, TMBIM6 regulated the local release of Ca2+ through lysosomal MCOLN1/TRPML1 channels under nutrient starvation or MTOR inhibition. The local Ca2+ efflux through MCOLN1 channels was found to activate PPP3/calcineurin, triggering TFEB (transcription factor EB) nuclear translocation, autophagy induction, and lysosome biogenesis. Upon genetic inactivation of TMBIM6, lysosomal Ca2+ and the associated TFEB nuclear translocation were decreased. Furthermore, autophagy flux was significantly enhanced in the liver or kidney from starved Tmbim6+/+ mice compared with that in the counter tmbim6-/- mice. Together, our observations indicated that under stress conditions, TMBIM6 increases lysosomal Ca2+ release, leading to PPP3/calcineurin-mediated TFEB activation and subsequently enhanced autophagy. Thus, TMBIM6, an ER membrane protein, is suggested to be a lysosomal Ca2+ modulator that coordinates with autophagy to alleviate metabolism stress.Abbreviations: AVs: autophagic vacuoles; CEPIA: calcium-measuring organelle-entrapped protein indicator; ER: endoplasmic reticulum; GPN: glycyl-L-phenylalanine-beta-naphthylamide; ITPR/IP3R: inositol 1,4,5-trisphosphate receptor; LAMP1: lysosomal associated membrane protein 1; MCOLN/TRPML: mucolipin; MEF: mouse embryonic fibroblast; ML-SA1: mucolipin synthetic agonist 1; MTORC1: mechanistic target of rapamycin kinase complex 1; RPS6KB1: ribosomal protein S6 kinase B1; SQSTM1: sequestosome 1; TFEB: transcription factor EB; TKO: triple knockout; TMBIM6/BI-1: transmembrane BAX inhibitor motif containing 6. |
| 巻・号 | 17(3) |
| ページ | 761-778 |
| 公開日 | 2021-3-1 |
| DOI | 10.1080/15548627.2020.1732161 |
| PMID | 32167007 |
| PMC | PMC8032251 |
| MeSH | Apoptosis / physiology Apoptosis Regulatory Proteins / metabolism* Autophagosomes / metabolism Autophagy / genetics* Calcineurin / metabolism Calcium / metabolism* Endoplasmic Reticulum / metabolism* Fibroblasts / metabolism Humans Lysosomes / genetics Lysosomes / metabolism* Membrane Proteins / metabolism* |
| IF | 9.77 |
| オルトメトリクス指標 |
オルトメトリクス指標項目
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| 最多言及媒体 | X(Twitter) |
| 各媒体での言及数の合計 | 8 |
| 過去6か月間でのオルトメトリクス指標の変動値 | 0.0 |
| リソース情報 | |
| 実験動物マウス | RBRC00806 |