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- W2095055568 abstract "SUMMARY Adenosine is a product of adenylate phosphate breakdown that can exert protective effects on tissues during energy limitation. Accumulation of cardiac adenosine under hypoxia is well documented in mammals but has not been shown in fish. Adenosine content was measured in heart and brain tissue from short-horned sculpin Myoxocephalus scorpius L. exposed to acute hypoxia and to graded hypoxia and reoxygenation at 8°C. Cardiorespiratory parameters were recorded along with plasma lactate, K+,Ca2+ and Na+ levels and their relationship to adenosine levels investigated. Sculpin exhibited a large bradycardia during hypoxia,with a concomitant drop in cardiac output that recovers fully with reoxygenation. Ventilation rate also declined with hypoxia, suggesting a depression of activity. Plasma lactate concentration was significantly elevated after 4 h at 2.0 mg l-1 dissolved oxygen while K+ levels increased during acute hypoxia. Adenosine levels were maintained in heart under acute and graded hypoxia. Brain levels fluctuated under hypoxia and showed no change with reoxygenation. It is concluded that a depression of cardiac activity in conjunction with an adequate anaerobic metabolism allow sculpin to avoid excessive adenosine accumulation under conditions of moderate hypoxia. Cardiac adenosine levels decreased and plasma K+ levels and heart rate increased significantly at reoxygenation." @default.
- W2095055568 created "2016-06-24" @default.
- W2095055568 creator A5048818766 @default.
- W2095055568 creator A5065030045 @default.
- W2095055568 date "2004-11-01" @default.
- W2095055568 modified "2023-09-27" @default.
- W2095055568 title "Cardiorespiratory and tissue adenosine responses to hypoxia and reoxygenation in the short-horned sculpin<i>Myoxocephalus scorpius</i>" @default.
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- W2095055568 doi "https://doi.org/10.1242/jeb.01251" @default.
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