Effects of temperature and calcium availability on ventricular myocardium from the neotropical teleost Piaractus mesopotamicus (Holmberg 1887-Teleostei, Serrasalmidae)

被引：10

作者：

Anelli, LC ^{[1
]}

Olle, CD ^{[1
]}

Costa, MJ ^{[1
]}

Rantin, FT ^{[1
]}

Kalinin, AL ^{[1
]}

机构：

[1] Univ Fed Sao Carlos, Dept Physiol Sci, BR-13656905 Sao Carlos, SP, Brazil

来源：

JOURNAL OF THERMAL BIOLOGY | 2004年 / 29卷 / 02期

基金：

巴西圣保罗研究基金会;

关键词：

heart function; excitation-contraction coupling; calcium management; sarcoplasmic reticulum; temperature; Piaractus mesopotamicus; fish;

D O I：

10.1016/j.jtherbio.2003.12.001

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

This study analyzed the effects of temperature on cardiac function of Piaractus mesopotamicus. The data suggest that the heart performance during temperature elevations is regulated mainly by chronotropic adjustments and that increased extracellular Ca2+ concentrations and high adrenaline can improve inotropism at high temperatures. When stimulation frequency was increased, a negative force-frequency relationship was observed at both 25degreesC and 35degreesC concomitant with increases in resting tension, indicating that relaxation is a limiting step. The post-rest potentiation was strongly inhibited by ryanodine, suggesting that, irrespective of temperature, the sarcoplasmic reticulum may contribute to excitation-contraction coupling. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：103 / 113

页数：11

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