title: Glycolytic switch in response to betulinic acid in non-cancer cells.
abstract: The naturally occurring triterpenoid betulinic acid (BA) shows pronounced polypharmacology ranging from anti-inflammatory to anti-lipogenic activities. Recent evidence suggests that rather diverse cellular signaling events may be attributed to the same common upstream switch in cellular metabolism. In this study we therefore examined the metabolic changes induced by BA (10 µM) administration, with focus on cellular glucose metabolism. We demonstrate that BA elevates the rates of cellular glucose uptake and aerobic glycolysis in mouse embryonic fibroblasts with concomitant reduction of glucose oxidation. Without eliciting signs of obvious cell death BA leads to compromised mitochondrial function, increased expression of mitochondrial uncoupling proteins (UCP) 1 and 2, and liver kinase B1 (LKB1)-dependent activation AMP-activated protein kinase. AMPK activation accounts for the increased glucose uptake and glycolysis which in turn are indispensable for cell viability upon BA treatment. Overall, we show for the first time a significant impact of BA on cellular bioenergetics which may be a central mediator of the pleiotropic actions of BA.
authors.affiliation: Department of Pharmacognosy, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria.
authors.forename: Elke H
authors.initials: EH
authors.lastname: Heiss
authors.affiliation: Department of Pharmacognosy, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria.
authors.forename: Matthias P
authors.initials: MP
authors.lastname: Kramer
authors.affiliation: Department of Pharmacognosy, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria.
authors.forename: Atanas G
authors.initials: AG
authors.lastname: Atanasov
authors.affiliation: Department of Pharmacognosy, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria.
authors.forename: Hortenzia
authors.initials: H
authors.lastname: Beres
authors.affiliation: Department of Pharmacognosy, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria.
authors.forename: Daniel
authors.initials: D
authors.lastname: Schachner
authors.affiliation: Department of Pharmacognosy, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria.
authors.forename: Verena M
authors.initials: VM
authors.lastname: Dirsch
mesh_terms: D055372:AMP-Activated Protein Kinases / Q000502:physiology*; D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D015153:Blotting, Western; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D004622:Embryo, Mammalian / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D004734:Energy Metabolism; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D005947:Glucose / Q000378:metabolism*; D006019:Glycolysis / Q000187:drug effects*; D061307:Human Umbilical Vein Endothelial Cells / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D051379:Mice; D018345:Mice, Knockout; D008928:Mitochondria / Q000187:drug effects / Q000378:metabolism; D010084:Oxidation-Reduction; D053978:Pentacyclic Triterpenes; D010766:Phosphorylation / Q000187:drug effects; D017346:Protein Serine-Threonine Kinases / Q000502:physiology*; D012333:RNA, Messenger / Q000235:genetics; D017382:Reactive Oxygen Species / Q000378:metabolism; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014315:Triterpenes / Q000494:pharmacology*; D000094062:Betulinic Acid
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D053978:Pentacyclic Triterpenes; D012333:RNA, Messenger; D017382:Reactive Oxygen Species; D014315:Triterpenes; C548179:Prkaa1 protein, mouse; D017346:Protein Serine-Threonine Kinases; C491654:Stk11 protein, mouse; D055372:AMP-Activated Protein Kinases; D005947:Glucose; D000094062:Betulinic Acid