title: Effects of pharmacological AMP deaminase inhibition and Ampd1 deletion on nucleotide levels and AMPK activation in contracting skeletal muscle.
abstract: AMP-activated protein kinase (AMPK) plays a central role in regulating metabolism and energy homeostasis. It achieves its function by sensing fluctuations in the AMP:ATP ratio. AMP deaminase (AMPD) converts AMP into IMP, and the AMPD1 isoenzyme is expressed in skeletal muscles. Here, effects of pharmacological inhibition and genetic deletion of AMPD were examined in contracting skeletal muscles. Pharmacological AMPD inhibition potentiated rises in AMP, AMP:ATP ratio, AMPK Thr172, and acetyl-CoA carboxylase (ACC) Ser218 phosphorylation induced by electrical stimulation, without affecting glucose transport. In incubated extensor digitorum longus and soleus muscles from Ampd1 knockout mice, increases in AMP levels and AMP:ATP ratio by electrical stimulation were potentiated considerably compared with muscles from wild-type mice, whereas enhanced AMPK activation was moderate and only observed in soleus, suggesting control by factors other than changes in adenine nucleotides. AMPD inhibitors could be useful tools for enhancing AMPK activation in cells and tissues during ATP-depletion.
authors.forename: Catheline
authors.initials: C
authors.lastname: Plaideau
authors.forename: Yu-Chiang
authors.initials: YC
authors.lastname: Lai
authors.forename: Samanta
authors.initials: S
authors.lastname: Kviklyte
authors.forename: Nadège
authors.initials: N
authors.lastname: Zanou
authors.forename: Lars
authors.initials: L
authors.lastname: Löfgren
authors.forename: Harriet
authors.initials: H
authors.lastname: Andersén
authors.forename: Didier
authors.initials: D
authors.lastname: Vertommen
authors.forename: Philippe
authors.initials: P
authors.lastname: Gailly
authors.forename: Louis
authors.initials: L
authors.lastname: Hue
authors.forename: Mohammad
authors.initials: M
authors.lastname: Bohlooly-Y
authors.forename: Stefan
authors.initials: S
authors.lastname: Hallén
authors.forename: Mark H
authors.initials: MH
authors.lastname: Rider
mesh_terms: D000659:AMP Deaminase / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D055372:AMP-Activated Protein Kinases / Q000378:metabolism*; D000103:Acetyl-CoA Carboxylase / Q000378:metabolism; D000249:Adenosine Monophosphate / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D004558:Electric Stimulation; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000494:pharmacology*; D005947:Glucose / Q000378:metabolism; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009119:Muscle Contraction / Q000187:drug effects*; D018482:Muscle, Skeletal / Q000187:drug effects / Q000378:metabolism*; D011685:Purine Nucleotides / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar
chemical_list: D004791:Enzyme Inhibitors; D011685:Purine Nucleotides; D000249:Adenosine Monophosphate; D000255:Adenosine Triphosphate; D055372:AMP-Activated Protein Kinases; D000659:AMP Deaminase; C577245:AMPD1 protein, mouse; D000103:Acetyl-CoA Carboxylase; D005947:Glucose