Differential Roles for L-Type Calcium Channel Subtypes in Alcohol Dependence

Neuropsychopharmacology. 2017 Apr;42(5):1058-1069. doi: 10.1038/npp.2016.266. Epub 2016 Dec 1.

Abstract

It has previously been shown that the inhibition of L-type calcium channels (LTCCs) decreases alcohol consumption, although the contribution of the central LTCC subtypes Cav1.2 and Cav1.3 remains unknown. Here, we determined changes in Cav1.2 (Cacna1c) and Cav1.3 (Cacna1d) mRNA and protein expression in alcohol-dependent rats during protracted abstinence and naive controls using in situ hybridization and western blot analysis. Functional validation was obtained by electrophysiological recordings of calcium currents in dissociated hippocampal pyramidal neurons. We then measured alcohol self-administration and cue-induced reinstatement of alcohol seeking in dependent and nondependent rats after intracerebroventricular (i.c.v.) injection of the LTCC antagonist verapamil, as well as in mice with an inducible knockout (KO) of Cav1.2 in Ca2+/calmodulin-dependent protein kinase IIα (CaMKIIα)-expressing neurons. Our results show that Cacna1c mRNA concentration was increased in the amygdala and hippocampus of alcohol-dependent rats after 21 days of abstinence, with no changes in Cacna1d mRNA. This was associated with increased Cav1.2 protein concentration and L-type calcium current amplitudes. Further analysis of Cacna1c mRNA in the CA1, basolateral amygdala (BLA), and central amygdala (CeA) revealed a dynamic regulation over time during the development of alcohol dependence. The inhibition of central LTCCs via i.c.v. administration of verapamil prevented cue-induced reinstatement of alcohol seeking in alcohol-dependent rats. Further studies in conditional Cav1.2-KO mice showed a lack of dependence-induced increase of alcohol-seeking behavior. Together, our data indicate that central Cav1.2 channels, rather than Cav1.3, mediate alcohol-seeking behavior. This finding may be of interest for the development of new antirelapse medications.

MeSH terms

  • Alcoholism / metabolism
  • Alcoholism / physiopathology*
  • Amygdala / drug effects
  • Amygdala / metabolism
  • Animals
  • Calcium Channel Blockers / administration & dosage
  • Calcium Channels / metabolism
  • Calcium Channels / physiology*
  • Calcium Channels, L-Type / metabolism
  • Calcium Channels, L-Type / physiology*
  • Drug-Seeking Behavior*
  • Ethanol / administration & dosage*
  • Hippocampus / drug effects
  • Hippocampus / metabolism
  • Hippocampus / physiology
  • Male
  • Membrane Potentials / drug effects
  • Pyramidal Cells / drug effects
  • Pyramidal Cells / physiology
  • RNA, Messenger
  • Rats, Wistar
  • Verapamil / administration & dosage

Substances

  • Calcium Channel Blockers
  • Calcium Channels
  • Calcium Channels, L-Type
  • L-type calcium channel alpha(1C)
  • RNA, Messenger
  • Cacna1d protein, rat
  • Ethanol
  • Verapamil