Gill denervation eliminates the barostatic reflex in a neotropical teleost, the tambaqui (Colossoma macropomum)

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dc.contributor.authorArmelin, Vinicius Araújo
dc.contributor.authorBraga, Victor Hugo da Silva [UNESP]
dc.contributor.authorTeixeira, Mariana Teodoro [UNESP]
dc.contributor.authorRantin, Francisco Tadeu
dc.contributor.authorFlorindo, Luiz Henrique [UNESP]
dc.contributor.authorKalinin, Ana Lúcia
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionNational Institute of Science and Technology in Comparative Physiology (INCT – FAPESP/CNPq)
dc.date.accessioned2018-12-11T17:01:18Z
dc.date.available2018-12-11T17:01:18Z
dc.date.issued2016-08-01
dc.description.abstractThe baroreflex is one of the most important regulators of cardiovascular homeostasis in vertebrates. It begins with the monitoring of arterial pressure by baroreceptors, which constantly provide the central nervous system with afferent information about the status of this variable. Any change in arterial pressure relative to its normal state triggers autonomic responses, which are characterized by an inversely proportional change in heart rate and systemic vascular resistance and which tend to restore pressure normality. Although the baroreceptors have been located in mammals and other terrestrial vertebrates, their location in fish is still not completely clear and remains quite controversial. Thus, the objective of this study was to locate the baroreceptors in a teleost, the Colossoma macropomum. To do so, the occurrence and efficiency of the baroreflex were both analyzed when this mechanism was induced by pressure imbalancements in intact fish (IN), first-gill-denervated fish (G1), and total-gill-denervated fish (G4). The pressure imbalances were initiated through the administration of the α1-adrenergic agonist phenylephrine (100 µg kg−1) and the α1-adrenergic antagonist prazosin (1 mg kg−1). The baroreflex responses were then analyzed using an electrocardiogram that allowed for the measurement of the heart rate, the relationship between pre- and post-pharmacological manipulation heart rates, the time required for maximum chronotropic baroreflex response, and total heart rate variability. The results revealed that the barostatic reflex was attenuated in the G1 group and nonexistent in G4 group, findings which indicate that baroreceptors are exclusively located in the gill arches of C. macropomum.en
dc.description.affiliationDepartment of Physiological Sciences Federal University of São Carlos (UFSCar), Rodovia Washington Luiz, km 235
dc.description.affiliationDepartment of Zoology and Botany São Paulo State University (UNESP), Rua Cristóvão Colombo, 2265
dc.description.affiliationNational Institute of Science and Technology in Comparative Physiology (INCT – FAPESP/CNPq)
dc.description.affiliationAquaculture Center (CAUNESP) São Paulo State University (UNESP), Rodovia Prof. Paulo Donato Castellane, n/n
dc.description.affiliationUnespDepartment of Zoology and Botany São Paulo State University (UNESP), Rua Cristóvão Colombo, 2265
dc.description.affiliationUnespAquaculture Center (CAUNESP) São Paulo State University (UNESP), Rodovia Prof. Paulo Donato Castellane, n/n
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent1213-1224
dc.identifierhttp://dx.doi.org/10.1007/s10695-016-0211-9
dc.identifier.citationFish Physiology and Biochemistry, v. 42, n. 4, p. 1213-1224, 2016.
dc.identifier.doi10.1007/s10695-016-0211-9
dc.identifier.file2-s2.0-84959331286.pdf
dc.identifier.issn1573-5168
dc.identifier.issn0920-1742
dc.identifier.lattes2797832406818407
dc.identifier.scopus2-s2.0-84959331286
dc.identifier.urihttp://hdl.handle.net/11449/172602
dc.language.isoeng
dc.relation.ispartofFish Physiology and Biochemistry
dc.relation.ispartofsjr0,690
dc.relation.ispartofsjr0,690
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectBaroreceptor
dc.subjectBaroreflex
dc.subjectGills
dc.subjectTambaqui
dc.subjectTeleost
dc.titleGill denervation eliminates the barostatic reflex in a neotropical teleost, the tambaqui (Colossoma macropomum)en
dc.typeArtigo
unesp.author.lattes2797832406818407

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