Abstract
Insulin has many varied actions in the proximal tubule. Two distinct activities include upregulation of sodium/bicarbonate reabsorption and downregulation of gluconeogenesis. The inability to perform these 2 tasks simultaneously under fed and fasted conditions can lead to hyper- or hypoglycemia, acidosis, and/or impaired extracellular fluid regulation. Nakamura and colleagues illuminate our understanding of this process, which appears to be managed in part by recruitment of different insulin receptor substrates under different physiological conditions.
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