Antinociceptive and anti-inflammatory effects of essential oil of Nepeta pogonosperma Jamzad et Assadi in Wister rats

37th Congress of IUPS (Birmingham, UK) (2013) Proc 37th IUPS, PCD153

Poster Communications: Antinociceptive and anti-inflammatory effects of essential oil of Nepeta pogonosperma Jamzad et Assadi in Wister rats

T. Ali1,2, M. Javan2, A. Sonboli3, S. Semnanian2

1. Physiology, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh. 2. Physiology, Tarbiat Modares University, Tehran, Iran, Islamic Republic of. 3. Biology, Shahid Beheshti University, Tehran, Iran, Islamic Republic of.

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Concerning the variability of effectiveness of essential oils from different species of Nepeta genus on CNS including analgesia, this study was designed to evaluate antinociceptive and anti-inflammatory effects of essential oil of Nepeta pogonosperma Jamzad et Assadi (NP). Air-dried aerial parts of NP were hydrodistillated and GC-MS analysis of obtained essential oil was conducted. Total 24 male Wister rats (225±25gm) were taken care according to international guidelines on use of laboratory animals and studied. Experimental rats received 50, 100 and 200mg/kg of NP essential oil and control rats received equal volume (2ml/kg) of normal saline intraperitoneally (n=6/group). Antinociception was assessed by tail flick test (D’Amour and Smith, 1941) followed by formalin test (50 μl of 2% formalin, subcutaneously) using a modification of original formalin test protocol (Dubisson and Dennis, 1997). Euthanasia was done by di-ethyl ether (99%, 10-12ml) followed by decapitation (Zschenderlein et al. 2011) and anti-inflammation was measured by water plethysmometry (Fereidoni et al. 2000). Data were mean±SEM and analyzed by ANOVA with Tukey’s post-hoc test. NP essential oil consisted of 4aα,7α,7aα nepetalactone (14.5%) and 1,8 cineole (31.2%) mainly. In tail flick test, 50mg/kg (10.25±8.06 vs. 11.04±5.9%) did not produce any analgesia, but 100 (26.99±2.79%; p<0.01) and 200 (43.98±7.73%; p<0.001) mg/kg reduced pain significantly. In early phase of formalin test, all doses reduced jerking frequency/5min (50mg/kg=78.66±20.67; 100mg/kg=64.5±15.47; 200mg/kg=30.83±7.16; control=201.33±14.01; p<0.001, in all doses), flexing seconds/5min (50mg/kg=62.5±20.24; 100mg/kg=65.33±18.31; 200mg/kg=50.5±21.14; control=148±21.57; p<0.05, p<0.05, p<0.01, respectively) and licking seconds/5min (50mg/kg=28.83±17.97; 100mg/kg=23.66±7.56; 200mg/kg=4.33±3.94; control=82±8.95; p<0.05, p<0.001, p<0.001, respectively). Again, in late phase of formalin test, all doses reduced jerking frequency/5min (50mg/kg=45.79±7.54; 100mg/kg=34.42±7.75; 200mg/kg=38.48±7.08; control=112.03±10.53; p<0.001, in all doses), flexing seconds/5min (50mg/kg=60.59±21.53; 100mg/kg=76.07±27.69; 200mg/kg=40.94±26.19; control=224.06±20.43; p<0.001, p<0.01, p<0.001, respectively) and licking seconds/5min (50mg/kg=12.83±3.22; 100mg/kg=18.46±4.78; 200mg/kg=5.66±1.66; control=33.03±3.83; p<0.01, p<0.05, p<0.001, respectively). Moreover, all doses reduced paw edema in % of control (50mg/kg=0.21±0.04, nonsignificant; 100mg/kg=0.13±0.02, p<0.01; 200mg/kg=0.2±0.03, p<0.05). This study reveals that NP essential oil may minimize both acute and chronic forms of nociception and may have potent role against inflammation.



Where applicable, experiments conform with Society ethical requirements.

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