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- W2316109267 abstract "3-Mercaptopicolinic acid (3-MPA) is reportedly a specific inhibitor of phosphoenolpyruvate (PEP) carboxykinase and has hitherto been used accordingly to elucidate the metabolic role of PEP carboxykinase in vitro and in vivo. We show that 3-MPA has multiple effects on intermediary metabolism in hemidiaphragms from 40 h-starved rats. It decreases the release of lactate + pyruvate and alanine in hemidiaphragms provided with no added substrate or with valine, leucine or isoleucine. Moreover, irrespective of the substrate provided (none, valine, leucine, isoleucine, glucose, acetate, oleate), 3-MPA decreases the [lactate]/[pyruvate] ratio. 3-MPA is without effect on 14CO2 production from [U-14C]valine, [1-14C]valine, [1-14C]leucine, [U-14C]isoleucine or [1-14C]oleate, but stimulates 14CO2 production from [U-14C]glucose and [1-14C]pyruvate and inhibits 14CO2 production from [1-14C]acetate. Glycolytic flux (measured as 3H2O formation from [5-3H]glucose) is stimulated by 3-MPA. It is concluded that 3-MPA has site(s) of actions other than PEP carboxykinase and that the putative role of PEP carboxykinase in alanine synthesis de novo in skeletal muscle from tricarboxylic acid-cycle intermediates and related amino acids requires reappraisal." @default.
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- W2316109267 date "1984-12-15" @default.
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- W2316109267 title "The role of phosphoenolpyruvate carboxykinase in muscle alanine synthesis" @default.
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- W2316109267 doi "https://doi.org/10.1042/bj2240971" @default.
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