Abstract:
:Alpha2-adrenergic drugs modulate cortical arousal and EEG. However, the role of individual alpha2-adrenoceptor (alpha(2)-AR) subtypes in these functions is not clear. We investigated the role of alpha(2C)-ARs in the modulation of baseline cortical EEG activity and EEG responses to the alpha(2)-AR selective agonist, dexmedetomidine (3-300 microg/kg, s.c.), and antagonist, atipamezole (3-1000 microg/kg, s.c.), by using alpha(2C)-AR knockout (KO) and wildtype (WT) mice. The overall amplitude (1-30 Hz) was not significantly altered in KO mice although the activity of theta band (4-8 Hz) was increased in these mice. The main finding was that dexmedetomidine (30-300 microg/kg) more effectively slowed and atipamezole (30-1000 microg/kg) less effectively increased cortical EEG arousal in KO mice compared to WT controls. Importantly, autoradiographical results showed no compensatory increase in other alpha(2)-AR subtypes in cortical, thalamic or other brain structures of KO mice. Furthermore, there were no differences between the genotypes in the levels of hippocampal choline acetyltransferase, monoamines or their metabolites. Altered baseline cortical EEG activity and EEG responses to alpha(2)-AR selective drugs in KO mice indicate that alpha(2C)-ARs are involved in regulation of cortical arousal. These results suggest that alpha(2C)-ARs may antagonize the sedative effect of alpha(2)-AR agonists mediated by activation of alpha(2A)-ARs.
journal_name
Neuropharmacologyjournal_title
Neuropharmacologyauthors
Puoliväli J,Björklund M,Holmberg M,Ihalainen JA,Scheinin M,Tanila Hdoi
10.1016/s0028-3908(02)00305-2subject
Has Abstractpub_date
2002-12-01 00:00:00pages
1305-12issue
8eissn
0028-3908issn
1873-7064pii
S0028390802003052journal_volume
43pub_type
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