title: The M2 splice isoform of pyruvate kinase is important for cancer metabolism and tumour growth.
abstract: Many tumour cells have elevated rates of glucose uptake but reduced rates of oxidative phosphorylation. This persistence of high lactate production by tumours in the presence of oxygen, known as aerobic glycolysis, was first noted by Otto Warburg more than 75 yr ago. How tumour cells establish this altered metabolic phenotype and whether it is essential for tumorigenesis is as yet unknown. Here we show that a single switch in a splice isoform of the glycolytic enzyme pyruvate kinase is necessary for the shift in cellular metabolism to aerobic glycolysis and that this promotes tumorigenesis. Tumour cells have been shown to express exclusively the embryonic M2 isoform of pyruvate kinase. Here we use short hairpin RNA to knockdown pyruvate kinase M2 expression in human cancer cell lines and replace it with pyruvate kinase M1. Switching pyruvate kinase expression to the M1 (adult) isoform leads to reversal of the Warburg effect, as judged by reduced lactate production and increased oxygen consumption, and this correlates with a reduced ability to form tumours in nude mouse xenografts. These results demonstrate that M2 expression is necessary for aerobic glycolysis and that this metabolic phenotype provides a selective growth advantage for tumour cells in vivo.
authors.affiliation: Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, USA.
authors.forename: Heather R
authors.initials: HR
authors.lastname: Christofk
authors.forename: Matthew G
authors.initials: MG
authors.lastname: Vander Heiden
authors.forename: Marian H
authors.initials: MH
authors.lastname: Harris
authors.forename: Arvind
authors.initials: A
authors.lastname: Ramanathan
authors.forename: Robert E
authors.initials: RE
authors.lastname: Gerszten
authors.forename: Ru
authors.initials: R
authors.lastname: Wei
authors.forename: Mark D
authors.initials: MD
authors.lastname: Fleming
authors.forename: Stuart L
authors.initials: SL
authors.lastname: Schreiber
authors.forename: Lewis C
authors.initials: LC
authors.lastname: Cantley
mesh_terms: D017398:Alternative Splicing / Q000235:genetics*; D000818:Animals; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D005635:Fructosediphosphates / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic; D006019:Glycolysis; D006801:Humans; D019344:Lactic Acid / Q000378:metabolism; D008175:Lung Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D008297:Male; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D009369:Neoplasms / Q000201:enzymology / Q000235:genetics / Q000378:metabolism* / Q000473:pathology*; D010085:Oxidative Phosphorylation; D010101:Oxygen Consumption; D011770:Pyruvate Kinase / Q000235:genetics* / Q000378:metabolism*; D019289:Pyruvic Acid / Q000378:metabolism
chemical_list: D005635:Fructosediphosphates; D019344:Lactic Acid; D019289:Pyruvic Acid; D011770:Pyruvate Kinase