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COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Effects of intrathecal administration of newer antidepressants on mechanical allodynia in rat models of neuropathic pain.
Neuroscience Research 2009 January
Antidepressants, especially tricyclic antidepressants (TCAs) are widely used for the treatment of various types of chronic and neuropathic pain. The antinociceptive effects of TCAs are, however, complicated. Therefore, two kinds of newer antidepressants whose functions have been more fully clarified were selected, milnacipran, a serotonin and noradrenaline reuptake inhibitor (SNRI) and paroxetine and fluvoxamine, which are selective serotonin reuptake inhibitors (SSRIs). The antiallodynic effects of intrathecal administration of these newer antidepressants were examined in two rat models of neuropathic pain, chronic constriction injury (CCI) of the sciatic nerve and streptozotocin (STZ)-induced diabetic neuropathy. The antiallodynic effect of these antidepressants was evaluated using the von Frey test. The intrathecal administration of milnacipran had an antiallodynic effect in both CCI and STZ-induced diabetic rats in a dose-dependent manner. On the other hand, the intrathecal administration of either paroxetine or fluvoxamine elicited little antiallodynic effect in CCI rats, while both SSRIs had antiallodynic effects in the STZ-induced diabetic rats in a dose-dependent manner. These results indicate a considerable difference to exist in the development and/or maintenance between these two animal models of neuropathic pain and suggest that each of these three antidepressants may be effective for the treatment of diabetic neuropathic pain.
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