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Papers of the Week

2021 Apr 17




Involvement of Opioid System and TRPM8/TRPA1 Channels in the Antinociceptive Effect of .


Freitas MA, Vasconcelos A, Gonçalves ECD, Ferrarini EG, Vieira GB, Cicia D, Cola M, Capasso R, Dutra RC
Biomolecules. 2021 Apr 17; 11(4).
PMID: 33920609.


is a "super-food" and has attracted researchers' attention due to its anti-inflammatory, antioxidant, and analgesic properties. Herein, we investigated the antinociceptive effects of in different rodent behavior models of inflammatory pain. Male Swiss mice were treated with (3-300 mg/kg, p.o.), indomethacin (10 mg/kg, p.o.), or vehicle (0.9% NaCl 10 mL/kg). Behavioral tests were performed with administration of acetic acid (0.6%, i.p.), formalin 2.7% (formaldehyde 1%, i.pl.), menthol (1.2 µmol/paw, i.pl.), cinnamaldehyde (10 nmol/paw, i.pl.), capsaicin (1.6 µg/paw, i.pl.), glutamate (20 µmol/paw, i.pl.), or naloxone (1 mg/kg, i.p.). The animals were also exposed to the rotarod and open field test to determine possible effects of on locomotion and motor coordination. The quantitative phytochemical assays exhibited that contains significant concentrations of total phenols and flavonoid contents, as well as it showed a powerful antioxidant effect with the highest scavenging activity. Oral administration of completely inhibited the abdominal contortions induced by acetic acid (ED = 20.51 mg/kg). treatment showed significant inhibition of formalin-induced nociceptive behavior during the inflammatory phase, and the opioid-selective antagonist markedly blocked this effect. Furthermore, our data indicate that the mechanisms underlying analgesia appear to be related to its ability to modulate TRMP8 and TRPA1, but not by TRPV1 or glutamatergic system. represents an orally active and safe natural analgesic that exhibits great therapeutic potential for managing inflammatory pain disorders.