Iptakalim: a potential antipsychotic drug with novel mechanisms?
Iptakalim is a novel putative adenosine triphosphate (ATP)-sensitive potassium (K(ATP)) channel opener. In the brain, iptakalim is thought to act on the neuronal and astrocytic plasma membrane and/or mitochondrial K(ATP) channels. Because iptakalim demonstrates an action on the regulation of dopamine and glutamate release in the forebrain regions, we examined its potential antipsychotic efficacy in several preclinical tests. First, we show that iptakalim is effective in reducing amphetamine- and phencyclidine-induced hyperlocomotion as well as selectively disrupting conditioned avoidance responding. Next, we show that combined iptakalim and amphetamine treatment produces a reduction on prepulse inhibition of acoustic startle and this combined drug effect is also found with haloperidol, but not with clozapine. Finally, we show that iptakalim and clozapine preferentially increase c-Fos expression in the medial prefrontal cortex, nucleus accumbens and lateral septal nucleus, whereas haloperidol induces a greater increase in the nucleus accumbens, the dorsolateral striatum and lateral septal nucleus. Collectively, our findings indicate that iptakalim is likely to be a potential antipsychotic drug with distinct mechanisms of action. This study also suggests that neuronal and astrocytic plasma membrane and/or mitochondrial K(ATP) channels may be a novel target that deserves attention for antipsychotic drug development. Future research using other sensitive tests is needed to confirm this property of iptakalim.
Sun
Tao
T
Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, PR China.
Zhao
Changjiu
C
Hu
Gang
G
Li
Ming
M
D000818:Animals; D014150:Antipsychotic Agents / Q000494:pharmacology / Q000627:therapeutic use*; D001362:Avoidance Learning / Q000187:drug effects* / Q000502:physiology; D001921:Brain / Q000187:drug effects / Q000378:metabolism; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism; D006948:Hyperkinesis / Q000139:chemically induced / Q000517:prevention & control*; D008297:Male; D011437:Propylamines / Q000494:pharmacology / Q000627:therapeutic use*; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D012559:Schizophrenia / Q000188:drug therapy / Q000503:physiopathology; D055139:Sensory Gating / Q000187:drug effects* / Q000502:physiology
D014150:Antipsychotic Agents; C502260:N-(1-methylethyl)-1,1,2-trimethylpropylamine; D011437:Propylamines