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• W2144358889 abstract "Air-breathing fishes represent interesting organisms in terms of understanding the physiological changes associated with the terrestrialization of vertebrates, and, further, are of great socio-economic importance for aquaculture in Southeast Asia. To understand how environmental factors, such as high temperature, affect O 2 transport in air-breathing fishes, this study assessed the effects of temperature on O 2 binding of blood and Hb in the economically important air-breathing fish Pangasianodon hypophthalmus. To determine blood O 2 binding properties, blood was drawn from resting cannulated fishes and O 2 binding curves made at 25°C and 35°C. To determine the allosteric regulation and thermodynamics of Hb O 2 binding, Hb was purified, and O 2 equilibria were recorded at five temperatures in the absence and presence of ATP and Cl − . Whole blood had a high O 2 affinity (O 2 tension at half saturation P 50 = 4.6 mmHg at extracellular pH 7.6 and 25°C), a high temperature sensitivity of O 2 binding (apparent heat of oxygenation Δ H app = −28.3 kcal/mol), and lacked a Root effect. Further, the data on Hb revealed weak ATP binding and a complete lack of Cl − binding to Hb, which, in part, explains the high O 2 affinity and high temperature sensitivity of blood O 2 binding. This study demonstrates how a potent mechanism for increasing O 2 affinity is linked to increased temperature sensitivity of O 2 transport and provides a basic framework for a better understanding of how hypoxia-adapted species will react to increasing temperatures." @default.
• W2144358889 created "2016-06-24" @default.
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• W2144358889 date "2015-06-01" @default.
• W2144358889 modified "2023-09-28" @default.
• W2144358889 title "High affinity and temperature sensitivity of blood oxygen binding in Pangasianodon hypophthalmus due to lack of chloride-hemoglobin allosteric interaction" @default.
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• W2144358889 doi "https://doi.org/10.1152/ajpregu.00470.2014" @default.
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• W2144358889 hasPublicationYear "2015" @default.
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