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چکیده
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Context: Diabetic neuropathic (DN) pain is one of the diabetes complications. Rosmarinic acid (RA), a natural phenol antioxidant, shows some biological activities, including anti-inflammatory, analgesic and antidiabetic effects. Objectives: We investigated the efficacy of RA administration (10 and 30 mg/kg) on streptozotocin (STZ)-induced neuropathy in rats. Material and methods: The animals received saline or RA (10 and 30 mg/kg, p.o.; once daily) for 8 weeks. DN was evaluated by tail flick (TF) method, formalin test and tactile allodynia. At the end, all rats were weighed and underwent plasma glucose measurement. Results: There was an increase in licking time during both formalin test phases in diabetic animals (138.5 ± 10.7, 448.7 ± 2.6 sec) that was decreased by RA10 mg/kg (103.5 ± 7.5, 284.4 ± 19 sec) and RA 30 mg/kg (81.8 ± 11, 192.7 ± 14 sec). RA 30 mg/kg caused antinociception during the early phase in treated controls (52.1 ± 6 sec) than untreated controls (99.4 ± 5.9 sec). The TF latency in diabetics (2.9 ± 0.1 sec) was increased in RA10 and 30 mg/kg treated diabetics (5.3 ± 0.4, 6± 0.86 sec). The paw withdrawal threshold of the diabetics (3.6 ± 0.7 g) was increased after RA 10 and 30 mg/kg (13.8 ± 0.3, 14 ± 0.4 g) treatment. RA did not induce a significant change in body weight and plasma glucose of rats. Conclusion: RA showed efficacy in amelioration of some aspects of DN. Therefore, RA makes a good candidate for DN treatment in clinical studies.
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