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- W2158608738 abstract "Abstract Background Stimulation of a variety of brain sites electrically or by opiates activates descending inhibitory pathways to attenuate noxious input to the spinal cord dorsal horn and produce analgesia. Analgesia induced by electrical stimulation of the periaqueductal grey ( PAG ) of the midbrain or medial rostral ventral medulla ( RVM ) matures late, towards the end or past the pre‐weaning period. Descending facilitation takes precedence over inhibition. Yet opiates injected intracerebroventricularly or directly into the PAG induce analgesia relatively early in development. Our goal was to re‐examine the role of opiates specific to individual receptor types in analgesia at several supraspinal sites. Methods Antinociception was tested following microinjection of DAMGO (μ‐opiate agonist), DPDPE (∂‐opiate agonist) or U 50,488 (κ‐opiate agonist) into the PAG , RVM or dorsal lateral pons ( DLP ) in 3‐, 10‐ and 14‐day‐old rats. Results DAMGO produced analgesia at 3 days of age at each brain area; the RVM was the most effective and the dorsal PAG was the least effective site. DPDPE produced modest analgesia at 10 and 14 days of age at the ventral PAG , RVM or DLP , but not the dorsal PAG . U 50,488 H was ineffective at all sites and all ages. Conclusions Antinociception could be elicited at all three sites by DAMGO as early as 3 days of age and DPDPE at 10 and 14 days of age. The degree of analgesia increased gradually during the first 2 weeks of life, and likely reflects the maturation of connections within the brain and of descending inhibitory paths from these sites." @default.
- W2158608738 created "2016-06-24" @default.
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- W2158608738 date "2012-12-03" @default.
- W2158608738 modified "2023-10-18" @default.
- W2158608738 title "Analgesia induced by localized injection of opiate peptides into the brain of infant rats" @default.
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- W2158608738 doi "https://doi.org/10.1002/j.1532-2149.2012.00245.x" @default.
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