Abstract
Purpose. We have studied the antinociceptive activity and blood andbrain delivery of nasal morphine with or without Biovector™nanoparticles in mice.
Methods. A tail flick assay was used to evaluate theantinociceptive activity. The kinetics of morphine were evaluated in blood andbrain, using tritiated morphine as tracer.
Results. These nanoparticles were shown to increase the durationof the antinociceptive activity of morphine after nasal administration.This effect was not due to an increase of morphine in the blood; andthe analgesic activity of morphine in association with nanoparticleswas reversed by naloxone. The ED50 value was 33.6 ±15.6 mg/kg for morphine alone and 14.4 ± 7.6 mg/kg in presenceof nanoparticles. They were only effective at low doses (1.5 to 2.5 μg),a higher or a lower dose had no effect. No interaction was found betweennanoparticles and morphine. NaDOC, a permeation enhancer, was unable toimprove nasal morphine activity.
Conclusions. These results show the presence of nanoparticles onlyat a very specific dose increases the antinociceptive activity of nasalmorphine in mice. The occurrence of a direct transport of morphinefrom the nasal mucosa to the brain is discussed.
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Betbeder, D., Spérandio, S., Latapie, JP. et al. Biovector™ Nanoparticles Improve Antinociceptive Efficacy of Nasal Morphine. Pharm Res 17, 743–748 (2000). https://doi.org/10.1023/A:1007594602449
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DOI: https://doi.org/10.1023/A:1007594602449