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- W2030446089 abstract "Adenine and hypoxanthine can be utilised by cardiac muscle cells as substrates for the synthesis of ATP. A possible therapeutic advantage of these compounds as high-energy precursors is their lack of vasoactive properties. Myocytes isolated from mature rat heart have been used to establish in kinetic detail the capacity of the heart to incorporate adenine, hypoxanthine and ribose into cellular nucleotides. Maximum rates of catalysis by enzymes on the salvage pathways have been established. Whilst the rate of incorporation of adenine into the ATP pool appears to depend upon intracellular concentrations of adenine and phosphoribosylpyrophosphate, for hypoxanthine the pattern is more complex. Hypoxanthine is salvaged at a slow rate compared with adenine, and is incorporated into GTP and IMP as well as into adenine nucleotides. The rate of incorporation of hypoxanthine into both IMP and ATP is accelerated in myocytes incubated with ribose. However, the rate-limiting reaction appears to be that catalysed by adenylosuccinate synthetase, for the rate of ATP synthesis is not accelerated when hypoxanthine concentration is increased from 10 to 50 microM, while the rate of IMP synthesis is more than doubled. Adenine and hypoxanthine phosphoribosyl transferases are present in equal catalytic amounts, but rat cardiac myocytes have very little adenylosuccinate synthetase activity. Exogenous ribose is incorporated into adenine nucleotides in amounts equimolar with adenine or hypoxanthine." @default.
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- W2030446089 title "Metabolism and salvage of adenine and hypoxanthine by myocytes isolated from mature rat heart" @default.
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- W2030446089 doi "https://doi.org/10.1016/0167-4889(85)90213-7" @default.
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