By using a glucose microassay and the technique for isolated renal-tubule perfusion in vitro, the addition of 3-mercaptopicolinate, a gluconeogenesis inhibitor which inhibits phosphoenolpyruvate carboxykinase specifically, was found to abolish the effects of parathyroid hormone on gluconeogenesis and phosphate-transport rate in isolated rabbit renal proximal straight tubules, suggesting that these parathyroid-hormone actions may share some unknown, yet 3-mercaptopicolinate-inhibitable, intracellular processes.

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