Int J Oral Biol.  2016 Dec;41(4):191-197. 10.11620/IJOB.2016.41.4.191.

Vitamin E Potentiates the Anti-nociceptive Effects by Intraperitoneal Administration of Lidocaine in Rats

Affiliations
  • 1Department of Oral Physiology, School of Dentistry, Kyungpook National University, Daegu, Korea. dkahn@knu.ac.kr

Abstract

The present study was to evaluate effects of vitamin E on intravenous administration of lidocaine-induced antinociception. Experiments were carried out using male Sprague-Dawley rats. Orofacial formalin-induced nociceptive behavioral responses were used as the orofacial animal pain model. Subcutaneous injection of formalin produced significant nociceptive scratching behavior. Intraperitoneal injection of 5 and 10 mg/kg of lidocaine attenuated formalin-induced nociceptive behavior in the 2nd phase, compared to the vehicle-treated group. Intraperitoneal injection of 1 g/kg of vitamin E also attenuated the formalin-induced nociceptive behavior in the 2nd phase, compared to the vehicle-treated group. However, low dose of vitamin E (0.5 g/kg) did not affect the nociceptive behavioral responses produced by subcutaneous injection of formalin. The present study also investigated effects of intraperitoneal injection of both vitamin E and lidocaine on orofacial formalin-induced behavioral responses. Vehicle treatment affected neither formalin-induced behavioral responses nor lidocaine-induced antinociceptive effects. However, intraperitoneal injection of 0.5 g/kg of vitamin E enhanced the lidocaine-induced antinociceptive effects in the 2nd phase compared to the vehicle-treated group. Intraperitoneal injection of naloxone, an opioid receptor antagonist, did not affect antinociception produced by intraperitoneal injections of both vitamin E and lidocaine. These results suggest that treatment with vitamin E enhances the systemic treatment with lidocaine-induced antinociception and reduces side effects when systemically treated with lidocaine. Therefore, the combined treatment with vitamin E and lidocaine is a potential therapeutic for chronic orofacial pain.

Keyword

lidocaine; vitamin E; formalin; pain; trigeminal

MeSH Terms

Administration, Intravenous
Animals
Facial Pain
Formaldehyde
Humans
Injections, Intraperitoneal
Injections, Subcutaneous
Lidocaine*
Male
Naloxone
Rats*
Rats, Sprague-Dawley
Receptors, Opioid
Vitamin E*
Vitamins*
Formaldehyde
Lidocaine
Naloxone
Receptors, Opioid
Vitamin E
Vitamins
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