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Metadados | Descrição | Idioma |
---|---|---|
Autor(es): dc.contributor | Universidade Federal de São Carlos (UFSCar) | - |
Autor(es): dc.contributor | Universidade Estadual Paulista (Unesp) | - |
Autor(es): dc.creator | Lopes, André G. [UNESP] | - |
Autor(es): dc.creator | Monteiro, Diana A. | - |
Autor(es): dc.creator | Kalinin, Ana L. | - |
Data de aceite: dc.date.accessioned | 2022-02-22T00:50:29Z | - |
Data de disponibilização: dc.date.available | 2022-02-22T00:50:29Z | - |
Data de envio: dc.date.issued | 2021-06-25 | - |
Data de envio: dc.date.issued | 2021-06-25 | - |
Data de envio: dc.date.issued | 2021-04-01 | - |
Fonte completa do material: dc.identifier | http://dx.doi.org/10.1002/jez.2457 | - |
Fonte completa do material: dc.identifier | http://hdl.handle.net/11449/207517 | - |
Fonte: dc.identifier.uri | http://educapes.capes.gov.br/handle/11449/207517 | - |
Descrição: dc.description | In many reptiles, digestion has been associated with the selection of higher body temperatures, the so-called post-prandial thermophilic response. This study aimed to investigate the excitation–contraction (E–C) coupling in postprandial broad-snouted caimans (Caiman latirostris) in response to acute warming within a preferred body temperature range of crocodiles. Isometric preparations subjected to a temperature transition from 25°C to 30°C were used to investigate myocardial contractility of postprandial caimans, that is, 48 h after the animals ingested a rodent meal corresponding to 15% of body mass. The caiman heart exhibits a negative force–frequency relationship that is independent of the temperature. At 25°C, cardiac muscle was able to maintain a constant force up to 36 bpm, above which it decreased significantly, reaching minimum values at the highest frequency of 84 bpm. Moreover, E–C coupling is predominantly dependent on transsarcolemmal Ca2+ transport denoted by the lack of significant ryanodine effects on force generation. On the contrary, ventricular strips at 30°C were able to sustain the cardiac contractility at higher pacing frequencies (from 12 to 144 bpm) due to an important role of Na+/Ca2+ exchanger in Ca2+ cycling, as indicated by the decay of the post-rest contraction, and a significant contribution of the sarcoplasmic reticulum above 72 bpm. Our results demonstrated that the myocardium of postprandial caimans exhibits a significant degree of thermal plasticity of E–C coupling during acute warming. Therefore, myocardial contractility can be maximized when postprandial broad-snouted caimans select higher body temperatures (preferred temperature zone) following feeding. | - |
Descrição: dc.description | Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) | - |
Descrição: dc.description | Department of Physiological Sciences Federal University of São Carlos | - |
Descrição: dc.description | Joint Graduate Program in Physiological Sciences Federal University of São Carlos–UFSCar/São Paulo State University UNESP Campus Araraquara | - |
Descrição: dc.description | Joint Graduate Program in Physiological Sciences Federal University of São Carlos–UFSCar/São Paulo State University UNESP Campus Araraquara | - |
Formato: dc.format | 417-425 | - |
Idioma: dc.language | en | - |
Relação: dc.relation | Journal of Experimental Zoology Part A: Ecological and Integrative Physiology | - |
???dc.source???: dc.source | Scopus | - |
Palavras-chave: dc.subject | acute warming | - |
Palavras-chave: dc.subject | cardiac function | - |
Palavras-chave: dc.subject | excitation–contraction coupling | - |
Palavras-chave: dc.subject | feeding | - |
Palavras-chave: dc.subject | reptile | - |
Palavras-chave: dc.subject | specific dynamic action | - |
Título: dc.title | Effects of change in temperature on the cardiac contractility of broad-snouted caiman (Caiman latirostris) during digestion | - |
Tipo de arquivo: dc.type | livro digital | - |
Aparece nas coleções: | Repositório Institucional - Unesp |
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