1. The analogs of adenosine D- and L-phenylisopropyladenosine (D- and L-PIA) and chloroadenosine (CADO) induced analgesia in mice (hot-plate test). 2. The antinociceptive effects of the three adenosine agonists were antagonized by caffeine but were unaffected by naloxone. 3. Morphine-induced antinociception was increased by pretreatment with adenosine agonists. 4. Whereas CADO significantly attenuated the induction of morphine tolerance, D- and L-PIA did not affect the process.
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| http://dx.doi.org/10.1016/0306-3623(90)91031-l | DOI Listing |
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