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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Covariation of alpha 2-adrenoceptor density and function following irreversible antagonism with EEDQ.

1. Administration of the irreversible antagonist, N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline, (EEDQ, 2 mg kg-1, i.p.) to mice reduced binding of [3H]-RX 821002 (2-methoxy-idazoxan) to alpha 2-adrenoceptors in whole mouse brain by 75% 24 h later. The receptor binding returned over time only being reduced by 25% by 16 days post administration; the time taken for binding to return to 50% of control levels was estimated to be 5.25 days. 2. EEDQ administration also resulted in the loss of the sedative effect of the alpha 2-adrenoceptor agonist, medetomidine, measured by the holeboard test of directed exploration and locomotor activity. Agonist-induced sedation returned to control values by 8 days post EEDQ administration. 3. EEDQ administration also resulted in the loss of the hypothermic response to medetomidine (0.1 mg kg-1, i.p.). Medetomidine-induced hypothermia returned to control values by 12 days post EEDQ administration. 4. Pretreatment with the selective alpha 2-adrenoceptor antagonist, RX 821002 (0.1-3.0 mg kg-1, i.p.) 45 min before EEDQ prevented the loss of alpha 2-adrenoceptors as well as the blockade of medetomide-induced sedation and hypothermia by EEDQ. 5. The results of these experiments indicate that there is significant receptor reserve for alpha 2-adrenoceptor-mediated behavioural and physiological responses.[1]

References

  1. Covariation of alpha 2-adrenoceptor density and function following irreversible antagonism with EEDQ. Durcan, M.J., Morgan, P.F., Van Etten, M.L., Linnoila, M. Br. J. Pharmacol. (1994) [Pubmed]
 
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