Journal
NEUROPSYCHOPHARMACOLOGY
Volume 37, Issue 4, Pages 1026-1035Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/npp.2011.287
Keywords
QTL; CK-1; psychomotor; dopamine; DARPP-32; opiate
Categories
Funding
- Institut de Recherches Internationales Servier
- DARPA/ARO
- Merck
- Takeda Pharmaceuticals
- Astra-Zeneca
- American Waterways Operators
- March of Dimes
- NHLBI
- NIA
- Department of Defense
- [R01DA021336]
- [R01MH079103]
- [K99DA029635]
- [F32DA026697]
- [T32DA007255]
- [R01MH068013]
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Csnk1e, the gene encoding casein kinase 1-epsilon, has been implicated in sensitivity to amphetamines. Additionally, a polymorphism in CSNK1E was associated with heroin addiction, suggesting that this gene may also affect opioid sensitivity. In this study, we first conducted genome-wide quantitative trait locus (QTL) mapping of methamphetamine (MA)-induced locomotor activity in C57BL/6J (B6) x DBA/ 2J (D2)-F-2 mice and a more highly recombinant F-8 advanced intercross line. We identified a QTL on chromosome 15 that contained Csnk1e (63-86 Mb; Csnk1e 79.25 Mb). We replicated this result and further narrowed the locus using B6. D2(Csnk1e) and D2.B6(Csnk1e) reciprocal congenic lines (78-86.8 and 78.7-81.6 Mb, respectively). This locus also affected sensitivity to the mu-opioid receptor agonist fentanyl. Next, we directly tested the hypothesis that Csnk1e is a genetic regulator of sensitivity to psychostimulants and opioids. Mice harboring a null allele of Csnk1e showed an increase in locomotor activity following MA administration. Consistent with this result, coadministration of a selective pharmacological inhibitor of Csnk1e (PF-4800567) increased the locomotor stimulant response to both MA and fentanyl. These results show that a narrow genetic locus that contains Csnk1e is associated with differences in sensitivity to MA and fentanyl. Furthermore, gene knockout and selective pharmacological inhibition of Csnk1e define its role as a negative regulator of sensitivity to psychostimulants and opioids. Neuropsychopharmacology (2012) 37, 1026-1035; doi: 10.1038/npp.2011.287; published online 16 November 2011
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