Changes

The nephron itself has a nominal role to play in glucose homeostasis. The efficiency with which glucose is reabsorbed in the proximal tubule is an essential way to prevent hypoglycaemia. When hyperglycaemia occurs, however, any excess glucose that cannot be reabsorbed is excreted in the urine. This occurs on account of the fact that the protein transport mechanisms have a maximum rate at which it can facilitate transepithelial movement, which is indeed the limiting factor in glucose reabsorption. When the glucose concentration reaches a threshold value, which is determined to be approximately 180-200 mg/dL in humans , the apical sodium-glucose symporters become “saturated”. The rate at which the substrates of the symporter can bind onto their respective domains on the protein is at a maximum, meaning that if glucose concentration is augmented above the threshold value, the excess glucose is simply excreted from the body.

The nephron itself has a nominal role to play in glucose homeostasis. The efficiency with which glucose is reabsorbed in the proximal tubule is an essential way to prevent hypoglycaemia. When hyperglycaemia occurs, however, any excess glucose that cannot be reabsorbed is excreted in the urine. This occurs on account of the fact that the protein transport mechanisms have a maximum rate at which it can facilitate transepithelial movement, which is indeed the limiting factor in glucose reabsorption. When the glucose concentration reaches a threshold value, which is determined to be approximately 180-200 mg/dL in humans , the apical sodium-glucose symporters become “saturated”. The rate at which the substrates of the symporter can bind onto their respective domains on the protein is at a maximum, meaning that if glucose concentration is augmented above the threshold value, the excess glucose is simply excreted from the body.