Regulation of Hematopoiesis and Methionine Homeostasis by mTORC1 Inhibitor NPRL2
Nitrogen permease regulator-like 2 (NPRL2) is a component of a conserved complex that inhibits mTORC1 (mammalian Target Of Rapamycin Complex 1) in response to amino acid insufficiency. Here, we show that NPRL2 is required for mouse viability and that its absence significantly compromises fetal liver...
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doaj-e6a38e82828d4c96b42c9a03c9f13bc82020-11-24T22:11:33ZengElsevierCell Reports2211-12472015-07-0112337137910.1016/j.celrep.2015.06.042Regulation of Hematopoiesis and Methionine Homeostasis by mTORC1 Inhibitor NPRL2Paul A. Dutchak0Sunil Laxman1Sandi Jo Estill2Chensu Wang3Yun Wang4Yiguang Wang5Gamze B. Bulut6Jinming Gao7Lily J. Huang8Benjamin P. Tu9Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9038, USADepartment of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9038, USADepartment of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9038, USASimmons Comprehensive Cancer Center and Department of Pharmacology, University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390-8807, USADepartment of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9038, USASimmons Comprehensive Cancer Center and Department of Pharmacology, University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390-8807, USADepartment of Cell Biology, University of Texas Southwestern Medical Center, 6000 Harry Hines Boulevard, Dallas, TX 75390-9039, USASimmons Comprehensive Cancer Center and Department of Pharmacology, University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390-8807, USADepartment of Cell Biology, University of Texas Southwestern Medical Center, 6000 Harry Hines Boulevard, Dallas, TX 75390-9039, USADepartment of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9038, USANitrogen permease regulator-like 2 (NPRL2) is a component of a conserved complex that inhibits mTORC1 (mammalian Target Of Rapamycin Complex 1) in response to amino acid insufficiency. Here, we show that NPRL2 is required for mouse viability and that its absence significantly compromises fetal liver hematopoiesis in developing embryos. Moreover, NPRL2 KO embryos have significantly reduced methionine levels and exhibit phenotypes reminiscent of cobalamin (vitamin B12) deficiency. Consistent with this idea, NPRL2 KO liver and mouse embryonic fibroblasts (MEFs) show defective processing of the cobalamin-transport protein transcobalamin 2, along with impaired lysosomal acidification and lysosomal gene expression. NPRL2 KO MEFs exhibit a significant defect in the cobalamin-dependent synthesis of methionine from homocysteine, which can be rescued by supplementation with cyanocobalamin. Taken together, these findings demonstrate a role for NPRL2 and mTORC1 in the regulation of lysosomal-dependent cobalamin processing, methionine synthesis, and maintenance of cellular re-methylation potential, which are important during hematopoiesis.http://www.sciencedirect.com/science/article/pii/S2211124715006543 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Paul A. Dutchak Sunil Laxman Sandi Jo Estill Chensu Wang Yun Wang Yiguang Wang Gamze B. Bulut Jinming Gao Lily J. Huang Benjamin P. Tu |
spellingShingle |
Paul A. Dutchak Sunil Laxman Sandi Jo Estill Chensu Wang Yun Wang Yiguang Wang Gamze B. Bulut Jinming Gao Lily J. Huang Benjamin P. Tu Regulation of Hematopoiesis and Methionine Homeostasis by mTORC1 Inhibitor NPRL2 Cell Reports |
author_facet |
Paul A. Dutchak Sunil Laxman Sandi Jo Estill Chensu Wang Yun Wang Yiguang Wang Gamze B. Bulut Jinming Gao Lily J. Huang Benjamin P. Tu |
author_sort |
Paul A. Dutchak |
title |
Regulation of Hematopoiesis and Methionine Homeostasis by mTORC1 Inhibitor NPRL2 |
title_short |
Regulation of Hematopoiesis and Methionine Homeostasis by mTORC1 Inhibitor NPRL2 |
title_full |
Regulation of Hematopoiesis and Methionine Homeostasis by mTORC1 Inhibitor NPRL2 |
title_fullStr |
Regulation of Hematopoiesis and Methionine Homeostasis by mTORC1 Inhibitor NPRL2 |
title_full_unstemmed |
Regulation of Hematopoiesis and Methionine Homeostasis by mTORC1 Inhibitor NPRL2 |
title_sort |
regulation of hematopoiesis and methionine homeostasis by mtorc1 inhibitor nprl2 |
publisher |
Elsevier |
series |
Cell Reports |
issn |
2211-1247 |
publishDate |
2015-07-01 |
description |
Nitrogen permease regulator-like 2 (NPRL2) is a component of a conserved complex that inhibits mTORC1 (mammalian Target Of Rapamycin Complex 1) in response to amino acid insufficiency. Here, we show that NPRL2 is required for mouse viability and that its absence significantly compromises fetal liver hematopoiesis in developing embryos. Moreover, NPRL2 KO embryos have significantly reduced methionine levels and exhibit phenotypes reminiscent of cobalamin (vitamin B12) deficiency. Consistent with this idea, NPRL2 KO liver and mouse embryonic fibroblasts (MEFs) show defective processing of the cobalamin-transport protein transcobalamin 2, along with impaired lysosomal acidification and lysosomal gene expression. NPRL2 KO MEFs exhibit a significant defect in the cobalamin-dependent synthesis of methionine from homocysteine, which can be rescued by supplementation with cyanocobalamin. Taken together, these findings demonstrate a role for NPRL2 and mTORC1 in the regulation of lysosomal-dependent cobalamin processing, methionine synthesis, and maintenance of cellular re-methylation potential, which are important during hematopoiesis. |
url |
http://www.sciencedirect.com/science/article/pii/S2211124715006543 |
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