Abstract
By converting changes in intracellular energy status to changes in cell membrane polarization, ATP-sensitive K+ (KATP) channels in hypothalamic appetite-regulating neurons play a critical role in linking neuronal electrochemical function, metabolic and energy status, and feeding behavior. Most atypical antipsychotics (AAPs) increase the appetite of patients with schizophrenia and thus cause obesity. This study aimed to explain the mechanism underlying AAP-induced appetite stimulation, based on the fact that the efficiency of fatty acid uptake into mitochondria generating ATP through β-oxidation is determined by the rate of fatty acid synthesis. Using PC12 cells exposed to clozapine, olanzapine, risperidone, quetiapine, ziprasidone, aripiprazole, and haloperidol, we measured intracellular ATP and mRNA and protein expression of enzymes and related substances involved in fatty acid synthesis and KATP channel function. Forty-eight-hour treatment of cells with 50 μM aripiprazole in 5.6 mM glucose decreased intracellular ATP. Only 50 μM aripiprazole phosphorylated AMP-activated protein kinase (AMPK); none of the other antipsychotics did so to a detectable level. Expression of carnitine palmitoyltransferase 1a, uncoupling protein 2, and sulfonylurea receptor 1 was unaffected by the antipsychotics, although expression of their mRNA was affected by AAPs. Pyrilamine (H1 receptor antagonist), ketanserin (5HT2 receptor antagonist), and raclopride (D2 receptor antagonist) alone or in combination had no effect on expression of the aforementioned proteins. Therefore, although this study did not differentiate orexigenic and non-orexigenic AAPs, it suggests that aripiprazole is unique in its ability to activate AMPK.
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Abbreviations
- AAP:
-
Atypical antipsychotic
- ACC:
-
Acetyl-CoA carboxylase
- AMPK:
-
AMP-activated protein kinase
- ANOVA:
-
Analysis of variance
- CaMKKβ:
-
Ca2+/calmodulin-dependent protein kinase β
- cAMP:
-
Cyclic AMP
- CoA:
-
Coenzyme A
- CPT1:
-
Carnitine palmitoyltransferase 1
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- FAS:
-
Fatty acid synthase
- GLUT3:
-
Glucose transporter 3
- HPRT:
-
Hypoxanthine–guanine phosphoribosyltransferase
- Ig:
-
Immunoglobulin
- KATP channels:
-
ATP-sensitive K+ channels
- LKB1:
-
Liver kinase B1
- MCD:
-
Malonyl-CoA decarboxylase
- PCR:
-
Polymerase chain reaction
- PGC1α:
-
PPARγ coactivator 1α
- PKA:
-
Protein kinase A
- POMC:
-
Proopiomelanocortin
- PPARα:
-
Peroxisome proliferator-activated receptor α
- PVDF:
-
Polyvinylidene fluoride
- SUR:
-
Sulfonylurea receptor
- UCP2:
-
Uncoupling protein 2
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Acknowledgments
This work was supported by grants-in-aid from Fujita Health University to AO. We thank Pfizer (New York, NY, USA) for the generous supply of ziprasidone.
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Fig.
Addendum Intracellular cAMP in PC12 cells treated with the AAPs or haloperidol. Cells were incubated with AAPs or haloperidol at final concentrations of 20 nM, 1μM, or 50 μM for 24 h in DMEM containing 25 or 5.6 mM glucose. The basal amount of intracellular cAMP in PC12 cells was 0.16–0.35 pmol/106 cells. Each group comprised 6 to 8 samples. Values normalized (=1.0) to those of vehicle are shown as means (columns) ± SEM (bars). Clo, clozapine; Ola, olanzapine; Ris, risperidone; Quet, quetiapine; Zip, ziprasidone; Arip, aripiprazole; Hal, haloperidol (PPT 63 kb)
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Takami, G., Ota, M., Nakashima, A. et al. Effects of atypical antipsychotics and haloperidol on PC12 cells: only aripiprazole phosphorylates AMP-activated protein kinase. J Neural Transm 117, 1139–1153 (2010). https://doi.org/10.1007/s00702-010-0457-9
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DOI: https://doi.org/10.1007/s00702-010-0457-9