Contractile function of fasting and digesting broad-snouted caiman (Caiman latirostris)

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Federal de São Carlos (UFSCar)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorLopes, André Guelli-
Autor(es): dc.creatorMonteiro, Diana Amaral-
Autor(es): dc.creatorVasconcelos, Eliton da Silva-
Autor(es): dc.creatorKalinin, Ana Lúcia-
Data de aceite: dc.date.accessioned2025-08-21T16:20:08Z-
Data de disponibilização: dc.date.available2025-08-21T16:20:08Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2022-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1139/cjz-2022-0180-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/305070-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/305070-
Descrição: dc.descriptionFeeding regimes are a critical process to ensure survival and reproduction, which modulate several behavioral and physiological patterns of ectotherms, especially cardiovascular adjustments. However, crocodilian myocardial contractile function after food intake remains understudied. We investigated the importance of ventricular myocardial contractility during digestion in the broad-snouted caiman, Caiman latirostris Daudin, 1801. Isometric ventricle preparations and Ca2+-handling protein expression were used to investigate the effects of prolonged fasting (30 days) and feeding (48 h after feeding on meals at 15% of body mass) on cardiac function. Upon feeding, there was no significant difference in relative ventricular mass. The cardiac response of the caiman to digestion was characterized by upregulation of the Na+/Ca2+ exchanger expression and an increase in myocardial contractility (positive inotropism and lusitropism) within the physiological range of heart rate. The digesting caiman’s ventricular myocardium was able to maintain faster kinetics of contraction and relaxation, allowing for significantly increased cardiac pumping capacity at higher pacing frequencies. Our results demonstrated that the myocardium of broad-snouted caimans exhibits specializations in excitation–contraction coupling, which can provide a means to support high cardiovascular performance during digestion.-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionUniversidade Estadual Paulista-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionDepartment of Physiological Sciences Federal University of Sao Carlos, SP-
Descrição: dc.descriptionFederal University of Sao Carlos (UFSCar) Sao Paulo State University (UNESP), São Carlos, SP-
Descrição: dc.descriptionFederal University of Sao Carlos (UFSCar) Sao Paulo State University (UNESP), São Carlos, SP-
Descrição: dc.descriptionCAPES: 001-
Formato: dc.format614-622-
Idioma: dc.languageen-
Relação: dc.relationCanadian Journal of Zoology-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectbroad-snouted caiman-
Palavras-chave: dc.subjectCaiman latirostris-
Palavras-chave: dc.subjectcardiac function-
Palavras-chave: dc.subjectcontractile force-
Palavras-chave: dc.subjectdigestion-
Palavras-chave: dc.subjectNa+/Ca2+ exchanger-
Palavras-chave: dc.subjectrelative ventricular mass-
Título: dc.titleContractile function of fasting and digesting broad-snouted caiman (Caiman latirostris)-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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