1. To investigate the role of NF-kB in the expression of opiate withdrawal,
the effects of PDTC, an inhibitor of NF-kBactivation, was studied on acute
opiate withdrawal induced by morphine in vitro.
2. After a 4 min in vitro exposure to morphine, a strong contracture of gui
nea pig isolated ileum was observed after the addition of naloxone.
3. PDTC (1x10(-8)-5x10(-8)-1x10(-7) M) was able to reduce the naloxone-indu
ced contracture after exposure to the opioid agonist in a concentration-dep
endent fashion.
4. The results of the present study indicate that NF-kB is involved in the
expression of opiate withdrawal thus extending and explaining previous pape
rs performed with dexamethasone and selective arachidonic acid metabolites
inhibitors.