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Simone S. Nascimento, Adriano A. S. Araújo, Renan G. Brito, Mairim R. Serafini, Paula P. Menezes , Josimari M. DeSantana, Waldecy Lucca Júnior, Pericles B. Alves, Arie F. Blank, Rita C. M. Oliveira, Aldeidia P. Oliveira, Ricardo L. C. Albuquerque-Júnior , Jackson R. G. S. Almeida and Lucindo J. Quintans-Júnior
International Journal of Molecular Sciences Volume 16 Issue , pages 547-563
Publication year: 2015

Abstract

O. basilicum leaves produce essential oils (LEO) rich in monoterpenes. The short half-life and water insolubility are limitations for LEO medical uses. β-Cyclodextrin (β-CD) has been employed to improve the pharmacological properties of LEO. We assessed the antihyperalgesic profile of LEO, isolated or complexed in β-CD (LEO/β-CD), on an animal model for fibromyalgia. Behavioral tests: mice were treated every day with either LEO/β-CD (25, 50 or 100 mg/kg, p.o.), LEO (25 mg/kg, p.o.), tramadol (TRM 4 mg/kg, i.p.) or vehicle (saline), and 60 min after treatment behavioral parameters were assessed. Therefore, mice were evaluated for mechanical hyperalgesia (von Frey), motor coordination (Rota-rod) and muscle strength (Grip Strength Metter) in a mice fibromyalgia model. After 27 days, we evaluated the central nervous system (CNS) pathways involved in the effect induced by experimental drugs through immunofluorescence protocol to Fos protein. The differential scanning analysis (DSC), thermogravimetry/derivate thermogravimetry (TG/DTG) and infrared absorption spectroscopy (FTIR) curves indicated that the products prepared were able to incorporate the LEO efficiently. Oral treatment with LEO or LEO-βCD, at all doses tested, produced a significant reduction of mechanical hyperalgesia and we were able to significantly increase Fos protein expression. Together, our results provide evidence that LEO, isolated or complexed with β-CD, produces analgesic effects on chronic non-inflammatory pain as fibromyalgia.

Keywords: Ocimum basilicum; essential oil; β-cyclodextrin; pain; fos protein; fibromyalgia

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