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• W2031227814 abstract "The purpose of this study was to investigate how the endogenous catecholamine adrenaline protects sarcolemmal Ca(2+) flux through the L-type Ca(2+) channel (I(Ca)) during acute exposure to cold in the fish heart. We examined the response of I(Ca) to adrenergic stimulation at three temperatures (7 degrees, 14 degrees, and 21 degrees C) in atrial myocytes isolated from rainbow trout acclimated to 14 degrees C. We found that I(Ca) amplitude varied directly with test temperature and was increased by adrenergic stimulation (AD; 5 nM and 1 microM) at all temperatures. However, I(Ca) was significantly more sensitive to adrenergic stimulation at the coldest test temperature. In fact, at 7 degrees C in the absence of AD, I(Ca) was extremely low. The addition of 1 microM AD increased peak I(Ca) 7.2-fold at 7 degrees C, 2.6-fold at 14 degrees C, and 1.6-fold at 21 degrees C and ameliorated the temperature-dependent difference in Ca(2+) influx across the cell membrane. We suggest that this increased adrenergic sensitivity is a critical compensatory mechanism that allows the rainbow trout heart to maintain contractility during acute exposure to cold temperatures. In particular, the tonic level of adrenergic stimulation provided by circulating plasma catecholamines (i.e., in the nM concentration range) may be crucial for effective excitation-contraction coupling in the cold cardiomyocyte." @default.
• W2031227814 created "2016-06-24" @default.
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• W2031227814 date "2003-11-01" @default.
• W2031227814 modified "2023-10-01" @default.
• W2031227814 title "Acute Temperature Change Modulates the Response of I_Cato Adrenergic Stimulation in Fish Cardiomyocytes" @default.
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• W2031227814 doi "https://doi.org/10.1086/378918" @default.
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