Clozapine activates AMP-activated protein kinase (AMPK) in C2C12 myotube cells and stimulates glucose uptake

Ji Hae Kim, Jung Ok Lee, Soo Kyung Lee, Jin Hee Jung, Ga Young You, Sun Hwa Park, Munho Park, Sang Dae Kim, Hyeon Soo Kim

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Aims: Clozapine has previously been implicated in the dysregulation of energy balance and glucose metabolism in the central nervous system, but its effects in the periphery have yet to be thoroughly elucidated. The objective of this study was to characterize the effects of clozapine on AMP-activated protein kinase (AMPK) activity in the skeletal muscles. Main methods: Myotube C2C12 cells were incubated under control conditions, or with clozapine. Expression levels of phosphorylation status of AMPK and its direct downstream Acetyl-CoA carboxylase (ACC) were analyzed by Western blot. Intracellular calcium concentration was measured with calcium indicator dye, fluo-3. AM. 2-deoxyglucose uptake was assessed via the scintillation count. Key findings: We reported that clozapine activated AMPK in mouse C2C12 myotubes and also stimulated glucose uptake. Clozapine also increased intracellular calcium concentrations of C2C12 cells, and pretreatment with either ethylenediaminetetraacetic acid (EDTA), an extracellular calcium chelator, or 1.8-naphthoylene benzimidazole-3-carboxylic acid (STO-609), a Ca2+/calmodulin-dependent protein kinase kinase (CaMKK) inhibitor, blocked clozapine-induced AMPK activation. Significance: These results demonstrate that clozapine increases glucose uptake through CaMKK-AMPK pathway in myotube C2C12 cells.

Original languageEnglish
Pages (from-to)42-48
Number of pages7
JournalLife Sciences
Issue number1-2
Publication statusPublished - 2010 Jul

Bibliographical note

Funding Information:
This study was supported by the Korea Science and Engineering Foundation Grant KOSEF, R01-2008-000-11180-0 and also supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea Government (MEST) (No. 2009-0077467 ).


  • AMPK
  • C2C12 myotubes
  • CaMKK
  • Calcium
  • Clozapine

ASJC Scopus subject areas

  • General Biochemistry,Genetics and Molecular Biology
  • Pharmacology, Toxicology and Pharmaceutics(all)


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