Autonomic control of post-air-breathing tachycardia in Clarias gariepinus (Teleostei: Clariidae)

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dc.contributor.authorTeixeira, Mariana Teodoro [UNESP]
dc.contributor.authorArmelin, Vinicius Araújo
dc.contributor.authorAbe, Augusto Shinya [UNESP]
dc.contributor.authorRantin, Francisco Tadeu
dc.contributor.authorFlorindo, Luiz Henrique [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2016-01-28T16:55:56Z
dc.date.available2016-01-28T16:55:56Z
dc.date.issued2015
dc.description.abstractThe African catfish (Clarias gariepinus) is a teleost with bimodal respiration that utilizes a paired suprabranchial chamber located in the gill cavity as an air-breathing organ. Like all air-breathing fishes studied to date, the African catfish exhibits pronounced changes in heart rate (f H) that are associated with air-breathing events. We acquired f H, gill-breathing frequency (f G) and air-breathing frequency (f AB) in situations that require or do not require air breathing (during normoxia and hypoxia), and we assessed the autonomic control of post-air-breathing tachycardia using an infusion of the β-adrenergic antagonist propranolol and the muscarinic cholinergic antagonist atropine. During normoxia, C. gariepinus presented low f AB (1.85 ± 0.73 AB h−1) and a constant f G (43.16 ± 1.74 breaths min−1). During non-critical hypoxia (PO2 = 60 mmHg), f AB in the African catfish increased to 5.42 ± 1.19 AB h−1 and f G decreased to 39.12 ± 1.58 breaths min−1. During critical hypoxia (PO2 = 20 mmHg), f AB increased to 7.4 ± 1.39 AB h−1 and f G decreased to 34.97 ± 1.78 breaths min−1. These results were expected for a facultative air breather. Each air breath (AB) was followed by a brief but significant tachycardia, which in the critical hypoxia trials, reached a maximum of 143 % of the pre-AB f H values of untreated animals. Pharmacological blockade allowed the calculation of cardiac autonomic tones, which showed that post-AB tachycardia is predominantly regulated by the parasympathetic subdivision of the autonomic nervous system.en
dc.description.affiliationDepartment of Zoology and Botany, São Paulo State University (UNESP), Cristóvão Colombo Street, 2265, São José Do Rio Preto, SP, 15054-000, Brazil
dc.description.affiliationNational Institute of Science and Technology in Comparative Physiology (INCT–FAPESP/CNPq), São Paulo, Brazil
dc.description.affiliationDepartment of Physiological Sciences, Federal University of São Carlos (UFSCar), Via Washington Luiz, km 235, São Carlos, SP, 13565-905, Brazil
dc.description.affiliationDepartment of Zoology, São Paulo State University (UNESP), 24A Avenue, 1515, Rio Claro, SP, 13506-900, Brazil
dc.description.affiliationUnespDepartment of Zoology and Botany, São Paulo State University (UNESP), Cristóvão Colombo Street, 2265, São José Do Rio Preto, SP, 15054-000, Brazil
dc.description.affiliationUnespDepartment of Zoology, São Paulo State University (UNESP), 24A Avenue, 1515, Rio Claro, SP, 13506-900, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.format.extent669-676
dc.identifierhttp://dx.doi.org/10.1007/s00360-015-0910-z
dc.identifier.citationJournal of Comparative Physiology. B, v. 185, n. 6, p. 669-676, 2015.
dc.identifier.doi10.1007/s00360-015-0910-z
dc.identifier.issn0174-1578
dc.identifier.lattes2797832406818407
dc.identifier.urihttp://hdl.handle.net/11449/133631
dc.language.isoeng
dc.relation.ispartofJournal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
dc.relation.ispartofjcr2.517
dc.relation.ispartofsjr0,952
dc.rights.accessRightsAcesso restrito
dc.sourceCurrículo Lattes
dc.subjectAfrican Catfishen
dc.subjectAutonomic controlen
dc.subjectAir Breathingen
dc.subjectHypoxiaen
dc.subjectTachycardiaen
dc.titleAutonomic control of post-air-breathing tachycardia in Clarias gariepinus (Teleostei: Clariidae)en
dc.typeArtigo
unesp.author.lattes2797832406818407
unesp.author.lattes8776757457144680[3]
unesp.author.orcid0000-0002-6765-8726[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt

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