The metabolic consequences of altered glucose transporter expression in transgenic mice

Journal of Molecular Medicine : Official Organ of the Gesellschaft Deutscher Naturforscher Und Ärzte
E B KatzM J Charron

Abstract

Glucose transporters are a family of membrane proteins which mediate glucose uptake across the cell membrane. The facilitative glucose transporter proteins are products of unique genes and are expressed in a tissue-specific manner. They are very similar structurally, containing 12 putative membrane spanning domains. Functionally they vary in their affinity for glucose and sensitivity to hormones such as insulin. Glucose homeostasis depends mainly on controlled changes in glucose transport in insulin-responsive tissues such as skeletal muscle and adipose cells where both glucose transporter 1 and glucose transporter 4 are expressed. Glucose transporter 4 is the major glucose transporter in these tissues and translocates from an intracellular vesicle to the cell membrane in response to insulin. Alterations of the level of expression of these glucose transporters should result in changes in insulin sensitivity and modification of whole-body metabolism. To test these hypotheses transgenic mouse models have been generated which overexpress glucose transporters in specific tissues or in the whole body. Glucose transporter 1 and glucose transporter 4 have been overexpressed specifically in skeletal muscle and glucose transporter 4 spe...Continue Reading

Citations

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