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Diosmetin, a novel transient receptor potential vanilloid 1 antagonist, alleviates the UVB radiation-induced skin inflammation in mice

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Abstract

UVB radiation-mediated inflammation and the oxidative process involve the transient receptor potential vanilloid 1 (TRPV1) channel activation in neuronal and non-neuronal cells. Once diosmetin has been identified as a novel TRPV1 antagonist, we evaluated the action of diosmetin from the inflammatory [ear oedema, myeloperoxidase (MPO) activity, histological changes, and cytokines levels] and oxidative [nicotinamide adenine dinucleotide phosphate (NADPH) oxidase and SOD activities] parameters in mice exposed to UVB radiation (0.5 j/cm2). We also verified the action of diosmetin on UVB radiation-induced inflammatory parameters after cutaneous nerve fibers denervation by RTX (50 µg/kg s.c.). The topical treatment with the novel TRPV1 antagonist, diosmetin (1%; 15 mg/ear), reduced ear oedema, MPO activity, and MIP-2 and IL-1β cytokines levels by 82 ± 8%, 59 ± 10%, 40 ± 12%, and 85 ± 9%, respectively. The action of diosmetin on ear oedema and inflammatory cell infiltration was histologically confirmed. Topical diosmetin (1%) also reduced NADPH oxidase activity by 67 ± 10% and reverted SOD activity by 81 ± 13%. After cutaneous nerve fibers denervation using RTX, diosmetin reduced ear oedema, but not the inflammatory cell infiltration in mice exposed to UVB radiation. Diosmetin can be a promising molecule against skin inflammatory disorders as a result of sunburn induced by UVB radiation exposure.

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Abbreviations

ANOVA:

Analysis of variance

BSA:

Serum albumin

CGRP:

Calcitonin gene-related peptide

Dexa 0.5%:

0.5% Dexamethasone

DMSO:

Dimethyl sulfoxide

EDTA:

Ethylenediamine tetraacetic acid

HCl:

Hydrochloric acid

HTAB:

Hexadecyl trimethylammonium bromide

IL-1β:

Interleukin 1β

i.p:

Intraperitoneal

MIP-2:

Protein inflammatory macrophage 2

MPO:

Myeloperoxidase

Na2CO3 :

Sodium carbonate

NADPH:

Nicotinamide adenine dinucleotide phosphate

NaOH:

Sodium hydroxide

NF-κB:

Nuclear factor kappa B

OD:

Optical density

PMSF:

Phenylmethane sulfonyl fluoride

ROS:

Reactive oxygen species

RTX:

Resiniferatoxin

SEM:

Standard error of the mean

SP:

Substance P

TRP:

Potential transient receptor

TRPV1:

Potential transient receptor vanilloid 1

UI:

International units

UVB:

Ultraviolet type B

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Acknowledgements

We thank the professor of the Program in Biological Sciences: Toxicological Biochemistry (Federal University of Santa Maria), Vera Morsch, for loaning equipment and all authors for their contribution. We also acknowledge fellowships from CNPq and CAPES.

Funding

Study was supported by the Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul-FAPERGS [Grant #17/2551-0001082-5] (Brazil); by the Conselho Nacional de Desenvolvimento Científico e Tecnológico-CNPq [Grant #406098/2018-2], and by the Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior—CAPES/PROEX [#23038.005450/2020-19, Grant: #0578/2020]. SMO is recipient of fellowship from CNPq [Grant #304985/2020-1]. CC, ESB, IB and NSP are recipient of fellowship from CAPES/PROEX (process #88882.182152/2018-01; process #88887.185973/2018-00; process #88882.182148/2018-01 and process #88882.182128/2018-01).

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Authors and Affiliations

Authors

Contributions

Participated in research design: [CC; SMO]. Conducted experiments: [CC; IB; ESB; NSP; NB; SMO]. Performed data analysis: [CC; SMO].Wrote or contributed to the writing of the manuscript: [CC; SMO]. All the authors reviewed the manuscript.

Corresponding author

Correspondence to Sara Marchesan Oliveira.

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The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving animals were in accordance with the ethical standards of the institution at which the studies were conducted and ethical approval was obtained from Institutional Committee for Animal Care and Use of the Federal University of Santa Maria (Process number 7999090818/2018).

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Camponogara, C., Brum, E.S., Pegoraro, N.S. et al. Diosmetin, a novel transient receptor potential vanilloid 1 antagonist, alleviates the UVB radiation-induced skin inflammation in mice. Inflammopharmacol 29, 879–895 (2021). https://doi.org/10.1007/s10787-021-00802-1

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  • DOI: https://doi.org/10.1007/s10787-021-00802-1

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