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Vol. 56, Issue 1, 39-45, July 1999
Shanghai Institute of Cell Biology, Learning and memory have been suggested to be important in the
development of opiate addiction. Based on the recent findings that
calcium/calmodulin-dependent protein kinase II (CaMKII) is essential in
learning and memory processes, and morphine treatment increases CaMKII
activity in hippocampus, the present study was undertaken to examine
whether inhibition of hippocampal CaMKII prevents morphine tolerance
and dependence. Here, we report that inhibition of CaMKII by
intrahippocampal dentate gyrus administration of the specific
inhibitors KN-62 and KN-93 to rats significantly attenuated the
tolerance to the analgesic effect of morphine and the abstinence
syndrome precipitated by opiate antagonist naloxone. In contrast, both
KN-04 and KN-92, the inactive structural analogs of KN-62 and KN-93,
failed to attenuate morphine tolerance and dependence, indicating that
the observed effects of KN-62 and KN-93 are mediated through inhibition
of CaMKII. Furthermore, administration of CaMKII antisense
oligonucleotide into rat hippocampal dentate gyrus, which decreased the
expression of CaMKII specifically, also attenuated morphine tolerance
and dependence, while the corresponding sense oligonucleotide of CaMKII
did not exhibit such inhibitory effect. Moreover, the KN-62 treatment
abolished the rewarding properties of morphine as measured by the
conditioned place preference. These results suggest that hippocampal
CaMKII is critically involved in the development of morphine tolerance
and dependence, and inhibition of this kinase may have some therapeutic
benefit in the treatment of opiate tolerance and dependence.
Copyright © 1999 by The American Society for Pharmacology and Experimental Therapeutics
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