Abstract
Diabetic neuropathy is a prevalent, disabling disorder. Currently, the only treatments
available to patients with diabetic neuropathy are glucose control and pain management.
B vitamin present neuroprotective effects, which are suggested to be related to their
analgesic action in various models of neuropathic pain. According to our literature
knowledge there is no report about antinociceptive effects of thiamine as benfotiamine
and opioids together in diabetic mice. The purpose of this study was to determine
the effects of benfotiamine on the antinociception produced by mu-opioid receptor
agonist fentanyl in diabetic mice. The effects of benfotiamine on antinociception
produced by fentanyl in diabetic mice were studied in 4 groups. Antinociceptive effect
was determined with tail flick, hot plate and formalin test. Our results showed that,
mu-opioid agonist fentanyl in benfotiamine applied diabetic group caused more potent
antinociceptive effect than in diabetic group without benfotiamine treatment. In brief
benfotiamine supplement in diet did not bring out antinociceptive effect itself, but
during development of STZ diabetes, benfotiamine replacement increased the antinociceptive
effect of fentanyl in mice tail-flick test. This effect is probably due to the replacement
of benfotiamine efficiency occuring in diabetes mellitus. Finally, we suppose that
oral benfotiamine replacement therapy may be useful to ameliorate analgesic effect
of mu-opioid agonists on neuropathic pain in diabetic case.
Key words
diabetic neuropathy - benfotiamine - nociception - opioid