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• W2890882009 abstract "Ionic channels such as the transient receptor potential ankyrin 1 (TRPA1) are essential for the detection and transmission of painful stimuli. In this sense, new TRPA1 antagonists have been searched as analgesics. Preclinical studies support the antinociceptive activity of Tabernaemontana catharinensis ethyl acetate fraction (Eta), which has constituents previously identified as TRPA1 antagonists (gallic acid). It was verified for the first time the involvement of the TRPA1 on Eta's antinociceptive and anti-inflammatory effects in mice pain models. It was evaluated the Eta's effect (0.01–100 mg/kg, oral route) on nociceptive (spontaneous nociception, mechanical and cold allodynia) and inflammatory (paw edema) parameters in pain models involved with TRPA1 activation. Firstly, it was investigated the ability of Eta to act on TRPA1 or TRPV1 channels (Ca2+influx and binding assays in mice spinal cords). Next, it was evaluated the Eta's antinociceptive and anti-inflammatory effects after intraplantar injection of TRPA1 agonists (hydrogen peroxide, cinnamaldehyde or allyl isothiocyanate) in male Swiss mice (30–35 g). Moreover, the Eta's antinociceptive effects were evaluated on complete Freund's adjuvant (CFA)-induced chronic inflammatory pain (CIP), postoperative pain and on paclitaxel-induced peripheral neuropathy (PIPN). Oxidative parameters were evaluated in mice paw utilized for CFA induced-CIP model. Eta inhibited the TRPA1 agonist-induced Ca2+ influx [Imax= 72.4 ± 1.5%; IC50= 0.023(0.004–0.125)µg/ml], but not TRPV1 agonist-induced, nor was able to displace [3H]-resiniferatoxin (TRPV1 agonist) binding. Eta (0.1–100 mg/kg) inhibited the spontaneous nociception [ID50= 0.043(0.002–0.723)mg/kg], mechanical [ID50= 7.417(1.426–38.570)mg/kg] and cold allodynia, and edema development caused by TRPA1 agonists. Moreover, Eta (100 mg/kg) prevented and reversed the CFA-induced CIP (Imax= 55.8 ± 13.7%, Imax= 80.4 ± 5.1%, respectively) and postoperative pain (Imax= 88.0 ± 11.6%, Imax= 51.3 ± 14.9%, respectively), been also effective in reversing the acute (Imax= 94.4 ± 12.4%) and chronic (Imax= 86.8 ± 8.6%) PIPN. These effects seem to occur by TRPA1 channels pathway, and independently of TRPV1 or oxidative mechanisms. Our results demonstrate that Eta-induced antinociception and anti-inflammatory effects occur by TRPA1 inhibition making possible the use of this preparation as a potential therapeutic agent to treat pathological pains." @default.
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• W2890882009 date "2019-02-01" @default.
• W2890882009 modified "2023-10-14" @default.
• W2890882009 title "TRPA1 involvement in analgesia induced by Tabernaemontana catharinensis ethyl acetate fraction in mice" @default.
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• W2890882009 doi "https://doi.org/10.1016/j.phymed.2018.09.201" @default.
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