Abstract
Sickness syndrome is an adaptive response that can be distinguished by specific signs and symptoms, such as fever and generalized hyperalgesia. Endothelin-1 (ET-1) is produced by inflammatory stimuli, including lipopolysaccharide, and involved in the pathogenesis of inflammation and pain by acting through ETA and ETB receptors. ET-1 also induces fever by acting on the central nervous system. The present study investigated the role of ET-1 in sickness syndrome responses, including hyperalgesia, anhedonia, and hypolocomotion. Intracerebroventricular ET-1 administration induced mechanical and thermal hyperalgesia in rats, which was ameliorated by the ETA receptor antagonist BQ123 and exacerbated by the ETB receptor antagonist BQ788. A cyclooxygenase blocker did not alter hyperalgesia that was induced by ET-1. Lipopolysaccharide administration induced hyperalgesia, and both BQ123 and BQ788 abolished this mechanical hyperalgesia, but the thermal response was only partially blocked. The blockade of ETA receptors in the hypothalamus also abolished lipopolysaccharide-induced mechanical hyperalgesia, and the ETB receptor antagonist did not influence this response. Lipopolysaccharide also induced anhedonia, reflected by lower sucrose preference, and reduced locomotor activity. Both antagonists restored locomotor activity, but only BQ788 reversed the reduction of sucrose preference. These results indicate that ET-1 and both ETA and ETB receptors are involved in various responses that are related to sickness syndrome, including hyperalgesia, anhedonia, and hypolocomotion, that is induced by LPS. Hypothalamic ETA but not ETB receptors are involved in mechanical hyperalgesia that is observed during lipopolysaccharide-induced sickness syndrome.
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Acknowledgements
LAL received a scholarship from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brazil. This study was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Grant # 457938/2014-5), Brazil.
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Conceptualization, methodology, formal analysis, and supervision: ARZ and DC. Data collection and data analysis: LAL, MCGL-A, JVC, and LCMC. Writing, review, and edition: LAL, JVC, and ARZ. All authors read and approved the final manuscript.
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Supplementary Figure 1: Effects of BQ123 and BQ788 on mechanical and thermal threshold in rats. Rats were treated with BQ123 (3 pmol/2 µl, i.c.v.) or BQ788 (3 pmol/2 µl, i.c.v.) or vehicle (Veh; 2 µl of sterile saline, i.c.v.) and then vehicle (Veh, 2 µl of sterile saline, i.c.v.). The mechanical threshold (A) and PWL (B) were evaluated at the indicated time points. The results are expressed as the mean ± SEM mechanical threshold (in grams) or PWL (in seconds). The number of animals/group is shown in the figure legends (TIFF 810 kb)
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Lomba, L.A., Cruz, J.V., Coelho, L.C.M. et al. Role of central endothelin-1 in hyperalgesia, anhedonia, and hypolocomotion induced by endotoxin in male rats. Exp Brain Res 239, 267–277 (2021). https://doi.org/10.1007/s00221-020-05929-1
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DOI: https://doi.org/10.1007/s00221-020-05929-1