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- W4234286144 abstract "The effects of intrathecally (i.t.) administered opioid antagonist naloxone (Nal), adenosine antagonist aminophylline (Aph), and γ-aminobutyric acid (GABA A )-receptor antagonist picrotoxin (PTX) or Bicuculline (BIC) on the antinociception produced by i.t. norepinephrine (NE), dopamine (DA), morphine (Mor), 5′-N-ethylcarboxamidoadenosine (NECA, an adenosine agonist) or muscimol (MUS, a selective GABA A -receptor agonist) were studied and compared using the tail-flick test in rats. The results showed that: (1) both i.t. NE (0.3, 0.5 and 1.0 nmol) and DA (5.5, 8.3 and 16.5 nmol) produced significant and dose-dependent increases in tail-flick latencies (antinociception); (2) both Nal (240 nmol) and Aph (120 nmol) blocked the antinociception produced by NE (1.0 nmol); (3) both Nal (240 nmol) and Aph (120 nmol) blocked the antinociception produced by Mor (0.5 nmol), but only Aph (120 nmol) blocked the antinociception produced by NECA (0.5 nmol), while Nal (240 nmol) did not; (4) neither Nal (240 nmol) nor Aph (120 nmol) altered the antinociception produced by DA (16.5 nmol); (5) both i.t. PTX (1.5 nmol) and BIC (0.5 nmol) completely blocked the antinociception produced by NE (1.0 nmol); and (6) both PTX and BIC blocked the antinociception produced by MUS (1.0 nmol). These results suggest that: (a) endogenous opiate and adenosine may be involved in the mediation of NE-induced, but not DA-induced, antinociception; (b) NE, opioid and adenosine may act in a sequential order in NE-induced antinociception at the spinal level; (c) endogenous GABA may be involved in the mediation of DA-induced antinociception through the GABA A -receptors, but is not involved in NE-induced antinociception at the spinal level." @default.
- W4234286144 created "2022-05-12" @default.
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- W4234286144 date "1996-12-01" @default.
- W4234286144 modified "2023-10-14" @default.
- W4234286144 title "Sequential Mediation of Norepinephrine- and Dopamine-Induced Antinociception at the Spinal Level: Involvement of Different Local Neuroactive Substances" @default.
- W4234286144 doi "https://doi.org/10.1016/s0361-9230(96)00151-7" @default.
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