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Archives of Oral Biology
journal homepage: www.elsevier.com/locate/archoralbio
Blockade of peripheral endothelin receptors abolishes heat hyperalgesia and T spontaneous nociceptive behavior in a rat model of facial cancer
Caroline Machado Kopruszinskia, ,1, Renata Cristiane dos Reisa, Giles Alexander Raeb, Juliana Geremias Chichorroa
a Department of Pharmacology, Biological Sciences Section, Federal University of Parana, Curitiba, Brazil
b Department of Pharmacology, Biological Sciences Center, Federal University of Santa, Catarina, Florianopolis, Brazil
Walker-256 tumor cells
Endothelins ETA receptor ETB receptor
Objective: To improve understanding of the pathophysiology of cancer-induced facial nociception, by evaluating the contribution of peripheral endothelin receptors in tumor-induced facial heat hyperalgesia, increased spon-taneous grooming, as well as ongoing nociception in a rat model of facial cancer.
Design: The study was conducted using 396 rats. Facial cancer was induced by inoculating a suspension of Walker-256 cells into the rats’ right vibrissal pad. Facial heat hyperalgesia and spontaneous grooming were assessed on day 6, while the conditioned place preference (CPP) test was performed on days 3–6 after tumor cells inoculation. Rats received local injections of the non-peptidic dual ETA/ETB endothelin receptors antagonist, bosentan (10 and 30 μg/50 μL), single or combined injections of peptidic ETA and ETB endothelin receptors antagonists (BQ-123 and BQ-788, at 20 ug/50 μL, each), or of lidocaine (1 mg/50 μl) and morphine (30 μg/ 50 μL).
Results: Bosentan, lidocaine and morphine local treatment all attenuated tumor-induced heat hyperalgesia (p < 0.05) and spontaneous facial grooming (p < 0.05). However, BQ-123 and BQ-788 did not modify tumor-induced heat hyperalgesia or the spontaneous facial grooming (p > 0.05). Whether this diﬀerence in eﬀec-tiveness is due to receptor aﬃnity or to pharmacokinetic factors still needs to be explored. Local injection of bosentan, lidocaine or morphine failed to control ongoing nociception, as evidenced by the absence of CPP in tumor-bearing rats (p > 0.05).
Conclusion: Endothelins, acting through peripheral ETA and ETB receptors, may play a significant role on the development of heat hyperalgesia and increased spontaneous grooming associated to facial cancer in rats.