Publication Date:
2010-12-03
Description:
Haematopoietic stem cells (HSCs) can convert between growth states that have marked differences in bioenergetic needs. Although often quiescent in adults, these cells become proliferative upon physiological demand. Balancing HSC energetics in response to nutrient availability and growth state is poorly understood, yet essential for the dynamism of the haematopoietic system. Here we show that the Lkb1 tumour suppressor is critical for the maintenance of energy homeostasis in haematopoietic cells. Lkb1 inactivation in adult mice causes loss of HSC quiescence followed by rapid depletion of all haematopoietic subpopulations. Lkb1-deficient bone marrow cells exhibit mitochondrial defects, alterations in lipid and nucleotide metabolism, and depletion of cellular ATP. The haematopoietic effects are largely independent of Lkb1 regulation of AMP-activated protein kinase (AMPK) and mammalian target of rapamycin (mTOR) signalling. Instead, these data define a central role for Lkb1 in restricting HSC entry into cell cycle and in broadly maintaining energy homeostasis in haematopoietic cells through a novel metabolic checkpoint.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3037591/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3037591/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gurumurthy, Sushma -- Xie, Stephanie Z -- Alagesan, Brinda -- Kim, Judith -- Yusuf, Rushdia Z -- Saez, Borja -- Tzatsos, Alexandros -- Ozsolak, Fatih -- Milos, Patrice -- Ferrari, Francesco -- Park, Peter J -- Shirihai, Orian S -- Scadden, David T -- Bardeesy, Nabeel -- DK050234/DK/NIDDK NIH HHS/ -- R01 DK050234/DK/NIDDK NIH HHS/ -- R01 DK050234-12/DK/NIDDK NIH HHS/ -- R01 DK050234-13/DK/NIDDK NIH HHS/ -- R01 HG005230/HG/NHGRI NIH HHS/ -- R01 HG005230-01/HG/NHGRI NIH HHS/ -- U01 CA141576-01/CA/NCI NIH HHS/ -- England -- Nature. 2010 Dec 2;468(7324):659-63. doi: 10.1038/nature09572.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cancer Center and Center for Regenerative Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21124451" target="_blank"〉PubMed〈/a〉
Keywords:
AMP-Activated Protein Kinases/metabolism
;
Adenosine Triphosphate/metabolism
;
Animals
;
Apoptosis
;
Autophagy
;
Bone Marrow/metabolism/pathology
;
Cell Cycle
;
Cell Proliferation
;
Cell Survival
;
*Energy Metabolism
;
Enzyme Activation
;
Female
;
Hematopoiesis
;
Hematopoietic Stem Cells/*cytology/*metabolism/pathology
;
Homeostasis
;
Lipid Metabolism
;
Male
;
Membrane Potential, Mitochondrial
;
Mice
;
Mice, Inbred C57BL
;
Mitochondria/metabolism/pathology
;
Multiprotein Complexes
;
Protein-Serine-Threonine Kinases/deficiency/genetics/*metabolism
;
Proteins/antagonists & inhibitors/metabolism
;
TOR Serine-Threonine Kinases/metabolism
;
Tumor Suppressor Proteins/deficiency/genetics/metabolism
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
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