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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Baclofen and NOS inhibitors interact to evoke synergistic hypothermia in rats.

Our laboratory recently demonstrated that a drug combination of baclofen and L-NAME, a nonspecific nitric oxide synthase (NOS) inhibitor, evokes synergistic hypothermia in rats. These data are the first demonstration of synergy between a GABA agonist and NOS inhibitor. While the hypothermic synergy suggests a role for NOS in baclofen pharmacology, it is unclear whether the super-additive hypothermia is specific for baclofen and L-NAME or extends to drug combinations of baclofen and other NOS inhibitors. The site of action (central or peripheral) and isoforms of NOS that mediate the synergy are also unknown. Here, we confirm the hypothermic synergy with additional data and discuss potential mechanisms of the drug interaction. Baclofen (2.5, 3.5, 5 and 7.5 mg/kg, i.p.) was administered to rats by itself or with 7-nitroindazole (7-NI), a neuronal NOS inhibitor. 7-NI (10 mg/kg, i.p.) did not affect body temperature. For combined administration, 7-NI (10 mg/kg, i.p.) increased the relative potency of baclofen (F=18.9, P<0.05). The present data validate the hypothermic synergy caused by the drug combination of baclofen and L-NAME and implicate nNOS in the synergy. In a context broader than thermoregulation, NO production and transmission may play an important role in baclofen pharmacology.[1]


  1. Baclofen and NOS inhibitors interact to evoke synergistic hypothermia in rats. Rawls, S.M., Jacobs, K., Tallarida, R.J. Life Sci. (2006) [Pubmed]
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