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• W1999902541 abstract "Paradoxical sleep deprivation (PSD) increases pain sensitivity and reduces morphine antinociception. Because dopaminergic neurons in the periaqueductal gray matter (PAG) participate in pain modulation and opioid-induced antinociception, we evaluated the effects of PSD on thermal pain sensitivity, morphine- and L-DOPA-induced antinociception and dopaminergic functionality in the PAG by assessing tyrosine hydroxylase (TH) immunoreactivity. Rats that were subjected to 96h of PSD received vehicle, morphine (2.5, 5 or 10mg/kg), L-DOPA (50 or 100mg/kg) or L-DOPA (50mg/kg)+morphine (2.5 and 5mg/kg) and were tested with a 46°C hot plate 1h after. The paw withdrawal latency responses to the hot plate were decreased in PSD rats and were modified by the highest dose of morphine, L-DOPA and L-DOPA+morphine. Analgesic effects were observed in control groups for all of the morphine doses as well as 100mg/kg of L-DOPA and L-DOPA (50mg/kg)+morphine (5mg/kg). The number of cell bodies that were immunopositive for TH in the PAG was reduced in PSD rats. In conclusion, increased thermal sensitivity was reversed by L-DOPA and could be caused by a reduction TH levels in the PAG. Our data also suggest a relationship between central dopaminergic networks and opiate-induced analgesia in rats." @default.
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• W1999902541 date "2011-07-01" @default.
• W1999902541 modified "2023-10-14" @default.
• W1999902541 title "Increased pain perception and attenuated opioid antinociception in paradoxical sleep-deprived rats are associated with reduced tyrosine hydroxylase staining in the periaqueductal gray matter and are reversed by L-DOPA" @default.
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• W1999902541 doi "https://doi.org/10.1016/j.pbb.2011.04.009" @default.
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