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Pharmacol Biochem Behav. 2014 Feb;117:34-9. doi: 10.1016/j.pbb.2013.12.002. Epub 2013 Dec 10.

Antinociceptive actions of peripheral glucose administration.

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Department of Psychology, Tufts University, Medford, MA 02155,USA. Electronic address:
Department of Psychology, Tufts University, Medford, MA 02155,USA.


The effects of intraperitoneal (ip) D-glucose administration on antinociception were studied in male Long-Evans rats. Rats were assessed for antinociception using the hot-water tail-withdrawal procedure (54±0.2 °C) to determine if peripheral administration of D-glucose (300, 560, or 720 mg/kg) would enhance morphine-mediated antinociception (MMA) (1.0, 3.0, 4.2, 5.6, and 10.0mg/kg cumulative-dosing regime) and if D-glucose (560, 720, or 1000 mg/kg) alone could produce antinociceptive activity that was naloxone (0.32 mg/kg) reversible. Additionally, the actions of D-glucose on MMA were compared with a stereoisomer, L-glucose, which is not metabolized. The results of these studies demonstrate that peripheral administration of D-glucose significantly enhances MMA and that D-glucose alone produces antinociceptive actions that are potentially mediated by the endogenous opioid system. Furthermore, L-glucose failed to have an effect on MMA suggesting that the alterations in antinociception seen with D-glucose are not due to stressors such as osmolality or injection. The current studies provide evidence that D-glucose alteration of antinociception is not simply a response to taste or gustation.


Antinociception; EOS; Glucose; MMA; Morphine; Rats; endogenous opioid system; morphine mediated antinociception

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