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Syntaxin 4 heterozygous knockout mice develop muscle insulin resistance.

C Yang¹, K J Coker, J K Kim

¹Department of Physiology and Biophysics, The University of Iowa, Iowa City, Iowa 52242, USA.

The Journal of Clinical Investigation

|May 26, 2001

Summary

Syntaxin 4 is crucial for glucose uptake in skeletal muscle. Its reduction impairs whole-body glucose metabolism, highlighting its physiological role in insulin sensitivity.

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Hyperinsulinemic-euglycemic Clamps in Conscious, Unrestrained Mice

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Area of Science:

Physiology
Molecular Biology
Genetics

Background:

Syntaxin 4 (Syn4) is a protein involved in intracellular vesicle trafficking.
Understanding its role in glucose transporter type 4 (GLUT4) trafficking is key to metabolic regulation.

Purpose of the Study:

To elucidate the physiological function of syntaxin 4 in regulating GLUT4 vesicle trafficking and glucose uptake.
To determine the impact of syntaxin 4 deficiency on glucose metabolism in vivo.

Main Methods:

Generation of syntaxin 4-knockout mice using homologous recombination.
Assessment of glucose tolerance, whole-body glucose uptake, and skeletal muscle glucose transport via 2-deoxyglucose uptake during hyperinsulinemic-euglycemic clamps.
Analysis of insulin-stimulated GLUT4 translocation in skeletal muscle.

Main Results:

Homozygous syntaxin 4 knockout resulted in embryonic lethality.
Heterozygous Syn4(+/-) mice exhibited impaired glucose tolerance and a 50% reduction in whole-body glucose uptake.
Skeletal muscle glucose transport and insulin-stimulated GLUT4 translocation were reduced by 50% in Syn4(+/-) mice.
Adipose tissue and liver glucose metabolism remained normal in Syn4(+/-) mice.

Conclusions:

Syntaxin 4 plays a critical physiological role in insulin-stimulated glucose uptake specifically in skeletal muscle.
Reduced syntaxin 4 protein levels in skeletal muscle directly contribute to impaired whole-body insulin-stimulated glucose metabolism.