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Arrabidaea chica Verlot fractions reduce MIA-induced osteoarthritis progression in rat knees

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Abstract

This study aims to investigate the activity of n-hexane, ethyl acetate and butanol fractions obtained from Arrabidaea chica Verlot against MIA-induced osteoarthritis (OA). The antinociceptive potentials of each fraction were evaluated through a cyclooxygenase (COX) 1 and 2 inhibition test and an in vivo OA-model. In addition, toxicity assessments in the liver, spleen and kidney, as well as radiographic and histopathological knee analyses, were performed. The chemical composition of the n-hexane fraction was elucidated, and a molecular docking protocol was carried out to identify which compounds are associated with the detected bioactivity. The n-hexane A. chica fraction preferentially inhibits COX-2, with 90% inhibition observed at 10 µg/mL. The fractions also produced significant improvements in OA incapacity, motor activity and hyperalgesia parameters and in radiological knee conditions. However, concerning the histopathological evaluations, these improvements were only significant in the hexane and ethyl acetate fraction treatments, which resulted in better average scores, suggesting that these fractions slow OA-promoted joint injury progression. Histopathological organ analyses indicate that the fractions are not toxic to animals. Twenty compounds were identified in the n-hexane fraction, comprising fatty acids, terpenes and phytosterols. In silico analyses indicate the presence of favourable interactions between some of the identified compounds and the COX–2 enzyme, mainly concerning alpha-tocopherol (Vitamin E), squalene and beta-sitosterol. The findings indicate that A. chica fractions display analgesic, anti-inflammatory properties, are non-toxic and are able to slow OA progression, and may, therefore, be prioritized as natural products in OA human clinical trials.

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Abbreviations

OA:

Osteoarthritis

IL-1:

Interleukin-1

IL-6:

Interleukin-6

COX-1:

Cyclooxygenase-1

COX-2:

Cyclooxygenase-2

NSAIDS:

Nonsteroidal anti-inflammatory drugs

Hex:

N-Hexane

EtAc:

Ethyl acetate

But:

Butanol

SISGEN:

National System of Genetic Heritage Management and Associated Traditional Knowledge

ECAU:

Ethics Committee in Animal Use

UFMA:

Federal University of Maranhão

MIA:

Sodium monoiodoacetate

NaCl:

Sodium chloride (saline)

APW:

Affected paw weight

CPW:

Contralateral paw weight

EDTA:

Ethylenediaminetetraacetic acid

OARSI:

Osteoarthritis Research Society International

GC/MS:

Gas chromatograph and mass spectrometry

EI-MS:

Electron-impact mass spectra

DFT:

Density functional theory

ANOVA:

Analysis of variance

iNOS:

Inducible nitric oxide synthase

PGE2:

Prostaglandin E2

TNF-α:

Tumour necrosis factor-α

NF-κB:

Nuclear factor kappa B

p38MAPK:

P38 mitogen-activated protein kinases

DPPH:

2,2-Diphenyl 1 picrylhydrazyl

ABTS:

2,2′-Azinobis-3-ethylbenzothiazoline-6-sulfonic acid

NO:

Nitric oxide

IL-1β:

Interleukin-1β

IFN-γ:

Interferon-gamma

LPS:

Lipopolysaccharide

PBMC:

Peripheral blood mononuclear cell

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Acknowledgements

The authors like to thank the Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão (FAPEMA) for financial support (Universal 871/17 grant process) and for the PhD scholarship given to Cleydlenne Vasconcelos and the Federal University of Ceará (UFC) National High-Performance Processing Center (Centro Nacional de Processamento de Alto Desempenho/CENAPAD-UFC) for providing the computational resources used in this study.

Funding

This research was funded by the Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão (FAPEMA) Process Universal 871/17.

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Correspondence to Cleydlenne Costa Vasconcelos or Maria do Socorro de Sousa Cartágenes.

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Conflict of interest

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

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Vasconcelos, C.C., Lopes, A.J.O., de Jesus Garcia Ataide, E. et al. Arrabidaea chica Verlot fractions reduce MIA-induced osteoarthritis progression in rat knees. Inflammopharmacol 29, 735–752 (2021). https://doi.org/10.1007/s10787-021-00803-0

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  • DOI: https://doi.org/10.1007/s10787-021-00803-0

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