Abstract
The effect of exogenous substances on the expression of opiate receptors on 108CC15 neuroblastoma X glioma hybrid cells has been studied. Cell differentiation by culture in the presence of N6-O2-dibutyryl adenosine 3',5'-cyclic monophosphate induced a three fold increase in opiate receptor density. When the cells were grown in the presence of 10(-5) M morphine hydrochloride for up to 23 days, opiate receptor densities were reduced by only 30% when compared with matched controls. Culture in the presence of 10(-7) M D-Ala2-D-Leu5-enkephalin produced opiate receptor down regulation of 73% compared to controls after only 4 h of treatment. The down regulation process could be inhibited by continued exposure to D-Ala2 D-Leu5-enkephalin at concentrations greater than 4 nM; below this concentration down regulation was rapid and irreversible. A model to explain these observations is described.
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