Adeno-associated virus (AAV)-mediated suppression of Ca2+/calmodulin kinase IV activity in the nucleus accumbens modulates emotional behaviour in mice.
BACKGROUND
Calcium/calmodulin-dependent protein kinase IV (CaMKIV) controls activity-dependent gene transcription by regulating the activity of the cyclic AMP response element binding protein (CREB). This signaling pathway is involved in gating emotional responses in the CNS but previous studies did not address the potential roles of CaMKIV in discrete brain regions. In the present study, we aimed at specifically dissecting the role of CaMKIV in the nucleus accumbens of adult mice.


RESULTS
We used recombinant adeno-associated virus (rAAV)-mediated gene transfer of a dominant-negative CaMKIV variant (rAAV-dnCaMKIV) to inhibit endogenous CaMKIV in the nucleus accumbens. rAAV-dnCaMKIV treated animals were subjected to a battery of tests including, prepulse inhibition of the acoustic startle response, open field, social interaction and anxiety-related behaviour. We found that basal locomotor activity in the open field, and prepulse inhibition or startle performance were unaltered in mice infected with rAAV-dnCaMKIV in the nucleus accumbens. However, anxiogenic effects were revealed in social interaction testing and the light/dark emergence test.


CONCLUSIONS
Our findings suggest a modulatory role of CaMKIV in the nucleus accumbens in anxiety-like behaviour but not sensorimotor gating.
Central Institute of Mental Health (ZI), Department of Psychopharmacology, J5, 68159 Mannheim, Germany. miriam.schneider@zi-mannheim.de
Miriam
M
Schneider
Rainer
R
Spanagel
Sheng-Jia
SJ
Zhang
Hilmar
H
Bading
Matthias
M
Klugmann
D000818:Animals; D054734:Calcium-Calmodulin-Dependent Protein Kinase Type 4 / Q000037:antagonists & inhibitors* / Q000096:biosynthesis / Q000235:genetics; D002478:Cells, Cultured; D000229:Dependovirus / Q000235:genetics*; D004644:Emotions / Q000502:physiology*; D004789:Enzyme Activation / Q000502:physiology; D006801:Humans; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D009043:Motor Activity / Q000502:physiology; D009714:Nucleus Accumbens / Q000201:enzymology*; D013216:Reflex, Startle / Q000502:physiology; D012919:Social Behavior
D054734:Calcium-Calmodulin-Dependent Protein Kinase Type 4