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  • 1
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    The Lkb1 metabolic sensor maintains haematopoietic stem cell survival (2010)
    Nature Publishing Group (NPG)
    Details
    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
    Published by Nature Publishing Group (NPG)
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  • 2
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    RNA sequencing of pancreatic circulating tumour cells implicates WNT signalling in metastasis (2012)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2012-07-06
    Description: Circulating tumour cells (CTCs) shed into blood from primary cancers include putative precursors that initiate distal metastases. Although these cells are extraordinarily rare, they may identify cellular pathways contributing to the blood-borne dissemination of cancer. Here, we adapted a microfluidic device for efficient capture of CTCs from an endogenous mouse pancreatic cancer model and subjected CTCs to single-molecule RNA sequencing, identifying Wnt2 as a candidate gene enriched in CTCs. Expression of WNT2 in pancreatic cancer cells suppresses anoikis, enhances anchorage-independent sphere formation, and increases metastatic propensity in vivo. This effect is correlated with fibronectin upregulation and suppressed by inhibition of MAP3K7 (also known as TAK1) kinase. In humans, formation of non-adherent tumour spheres by pancreatic cancer cells is associated with upregulation of multiple WNT genes, and pancreatic CTCs revealed enrichment for WNT signalling in 5 out of 11 cases. Thus, molecular analysis of CTCs may identify candidate therapeutic targets to prevent the distal spread of cancer.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3408856/" 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/PMC3408856/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yu, Min -- Ting, David T -- Stott, Shannon L -- Wittner, Ben S -- Ozsolak, Fatih -- Paul, Suchismita -- Ciciliano, Jordan C -- Smas, Malgorzata E -- Winokur, Daniel -- Gilman, Anna J -- Ulman, Matthew J -- Xega, Kristina -- Contino, Gianmarco -- Alagesan, Brinda -- Brannigan, Brian W -- Milos, Patrice M -- Ryan, David P -- Sequist, Lecia V -- Bardeesy, Nabeel -- Ramaswamy, Sridhar -- Toner, Mehmet -- Maheswaran, Shyamala -- Haber, Daniel A -- 5K12CA87723-09/CA/NCI NIH HHS/ -- 5R01EB008047/EB/NIBIB NIH HHS/ -- CA129933/CA/NCI NIH HHS/ -- P01 CA117969/CA/NCI NIH HHS/ -- R01 CA129933/CA/NCI NIH HHS/ -- U01 EB012493/EB/NIBIB NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2012 Jul 26;487(7408):510-3. doi: 10.1038/nature11217.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Massachusetts General Hospital Cancer Center, Harvard Medical School, Boston, Massachusetts 02114, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22763454" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Survival ; Contact Inhibition ; Disease Models, Animal ; Gene Expression Regulation, Neoplastic/*genetics ; Genes, Neoplasm/genetics ; Humans ; MAP Kinase Kinase Kinases/antagonists & inhibitors ; Mice ; Neoplasm Metastasis/*genetics ; Neoplastic Cells, Circulating/*metabolism ; Pancreatic Neoplasms/*genetics/*pathology ; RNA, Messenger/analysis/biosynthesis ; Sequence Analysis, RNA ; Wnt Proteins/genetics/*metabolism ; Wnt Signaling Pathway/*genetics ; Wnt2 Protein/genetics/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 3
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    The glycan CA19-9 promotes pancreatitis and pancreatic cancer in mice (2019)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2019
    Description: 〈p〉Glycosylation alterations are indicative of tissue inflammation and neoplasia, but whether these alterations contribute to disease pathogenesis is largely unknown. To study the role of glycan changes in pancreatic disease, we inducibly expressed human fucosyltransferase 3 and β1,3-galactosyltransferase 5 in mice, reconstituting the glycan sialyl-Lewis〈sup〉a〈/sup〉, also known as carbohydrate antigen 19-9 (CA19-9). Notably, CA19-9 expression in mice resulted in rapid and severe pancreatitis with hyperactivation of epidermal growth factor receptor (EGFR) signaling. Mechanistically, CA19-9 modification of the matricellular protein fibulin-3 increased its interaction with EGFR, and blockade of fibulin-3, EGFR ligands, or CA19-9 prevented EGFR hyperactivation in organoids. CA19-9–mediated pancreatitis was reversible and could be suppressed with CA19-9 antibodies. CA19-9 also cooperated with the 〈i〉Kras〈sup〉G12D〈/sup〉〈/i〉 oncogene to produce aggressive pancreatic cancer. These findings implicate CA19-9 in the etiology of pancreatitis and pancreatic cancer and nominate CA19-9 as a therapeutic target.〈/p〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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