Autophagy preserves hematopoietic stem cells by restraining MTORC1-mediated cellular anabolism.
Autophagy preserves hematopoietic stem cells by restraining MTORC1-mediated cellular anabolism.
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自噬通过抑制 MTORC1 介导的细胞合成代谢来保护造血干细胞。
DOI:
10.1080/15548627.2023.2247310
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发表时间:
2024-01
期刊:
影响因子:
13.3
通讯作者:
Simon, Anna Katharina
中科院分区:
文献类型:
--
作者:
Borsa, Mariana;Obba, Sandrine;Richter, Felix C.;Zhang, Hanlin;Riffelmacher, Thomas;Carrelha, Joana;Alsaleh, Ghada;Jacobsen, Sten Eirik W.;Simon, Anna Katharina
Adult stem cells are long-lived and quiescent with unique metabolic requirements. Macroautophagy/autophagy is a fundamental survival mechanism that allows cells to adapt to metabolic changes by degrading and recycling intracellular components. Here we address why autophagy depletion leads to a drastic loss of the stem cell compartment. Using inducible deletion of autophagy specifically in adult hematopoietic stem cells (HSCs) and in mice chimeric for autophagy-deficient and normal HSCs, we demonstrate that the stem cell loss is cell-intrinsic. Mechanistically, autophagy-deficient HSCs showed higher expression of several amino acid transporters (AAT) when compared to autophagy-competent cells, resulting in increased amino acid (AA) uptake. This was followed by sustained MTOR (mechanistic target of rapamycin) activation, with enlarged cell size, glucose uptake and translation, which is detrimental to the quiescent HSCs. MTOR inhibition by rapamycin treatment in vivo was able to rescue autophagy-deficient HSC loss and bone marrow failure and resulted in better reconstitution after transplantation. Our results suggest that targeting MTOR may improve aged stem cell function, promote reprogramming and stem cell transplantation. List of abbreviations: 5FU: fluoracil; AA: amino acids; AKT/PKB: thymoma viral proto-oncogene 1; ATF4: activating transcription factor 4; BafA: bafilomycin A1; BM: bone marrow; EIF2: eukaryotic initiation factor 2; EIF4EBP1/4EBP1: eukaryotic translation initiation factor 4E binding protein 1; KIT/CD117/c-Kit: KIT proto-oncogene receptor tyrosine kinase; HSCs: hematopoietic stem cells; HSPCs: hematopoietic stem and progenitor cells; Kyn: kynurenine; LSK: lineage− (Lin−), LY6A/Sca-1+, KIT/c-Kit/CD117+; LY6A/Sca-1: lymphocyte antigen 6 family member A; MTOR: mechanistic target of rapamycin kinase; MTORC1: MTOR complex 1; MTORC2: MTOR complex 2; OPP: O-propargyl-puromycin; PI3K: phosphoinositide 3-kinase; poly(I:C): polyinosinic:polycytidylic acid; RPS6/S6: ribosomal protein S6; tam: tamoxifen; TCA: tricarboxylic acid; TFEB: transcription factor EB; PTPRC/CD45: Protein Tyrosine Phosphatase Receptor Type C, CD45 antigen.
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影响因子:
64.5
作者:
Buszczak M;Signer RA;Morrison SJ
通讯作者:
Morrison SJ
影响因子:
64.5
作者:
Lu W;Zhang Y;McDonald DO;Jing H;Carroll B;Robertson N;Zhang Q;Griffin H;Sanderson S;Lakey JH;Morgan NV;Reynard LN;Zheng L;Murdock HM;Turvey SE;Hackett SJ;Prestidge T;Hall JM;Cant AJ;Matthews HF;Koref MF;Simon AK;Korolchuk VI;Lenardo MJ;Hambleton S;Su HC
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Su HC
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64.8
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Chen, Jie;Ou, Yuhui;Liu, Ying
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Liu, Ying
影响因子:
9.8
作者:
Lopez-Herrera, Gabriela;Tampella, Giacomo;Grimbacher, Bodo
通讯作者:
Grimbacher, Bodo
影响因子:
5.5
作者:
Fuchs, Bryan C.;Finger, Richard E.;Bode, Barrie P.
通讯作者:
Bode, Barrie P.