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The hexosamine biosynthetic pathway has recently been proposed as a mechanism through which cells "sense" nutrient flux to regulate leptin release. This study was undertaken to examine the regulation of leptin production by hexosamines in human adipocytes. Adipose tissue UDP-N-acetylglucosamine, an
OBJECTIVE
Diet-induced obesity (DIO) is associated with insulin resistance in liver and muscle, but not in adipose tissue. Mice with fat-specific disruption of the gene encoding the insulin receptor are protected against DIO and glucose intolerance. In cell culture, glutamine induces insulin
Traditionally, nutrients such as glucose and amino acids have been viewed as substrates for the generation of high-energy molecules and as precursors for the biosynthesis of macromolecules. However, it is now apparent that nutrients also function as signaling molecules in functionally diverse signal
Increases in glutamine:fructose-6-phosphate aminotransferase (GFAT) protein levels directly activate flux through the hexosamine biosynthetic pathway. This pathway has been involved as a fuel sensor in energy metabolism and development of insulin resistance. We screened the 5'-flanking region of the
Animal studies suggest that overactivity of the hexosamine pathway, resulting in increased UDP-hexosamines [UDP-N-acetylglucosamine (UDP-GlcNAc) and UDP-N-acetylgalactosamine (UDP-GalNAc)] is an important mechanism by which hyperglycemia causes insulin resistance. This study was performed to test
It has been proposed that the hexosamine pathway acts as a nutrient-sensing pathway, protecting the cell against abundant fuel supply, and that accumulation of hexosamines represents a biochemical mechanism by which hyperglycemia and hyperlipidemia induce insulin resistance. We hypothesized that if
Enhanced glucose flux via the hexosamine biosynthetic pathway has been implicated in insulin resistance. We measured products of this pathway, UDP-N-acetyl hexosamines (UDP-HexNAc), and activity of the rate-limiting enzyme L-glutamine:D-fructose-6-phosphate amidotransferase (GFAT) in tissues of
To examine the effect of increased hexosamine flux in liver, the rate-limiting enzyme in hexosamine biosynthesis (glutamine:fructose-6-phosphate amidotransferase [GFA]) was overexpressed in transgenic mice using the PEPCK promoter. Liver from random-fed transgenic mice had 1.6-fold higher GFA
What effect does replacing chicken or pork with herring as the main dietary source of protein have on the human plasma metabolome?
A randomised crossover trial with 15 healthy obese men and women (age 24-70 years). Subjects were randomly assigned to four weeks of herring diet or a reference diet of
Hexosamines have been shown to mediate effects of hyperglycemia and so-called "glucose toxicity" in insulin-sensitive tissues. To determine the effects of hexosamines on insulin synthesis and secretion, transgenic mice were created to overexpress the rate-limiting enzyme for hexosamine synthesis,
O-linked N-acetylglucosamine, better known as O-GlcNAc, is a sugar post-translational modification participating in a diverse range of cell functions. Disruptions in the cycling of O-GlcNAc mediated by O-GlcNAc transferase (OGT) and O-GlcNAcase (OGA), respectively, is a driving force for aberrant
High concentrations of glucose induce insulin resistance, impair insulin secretion, and affect hepatic glucose production in a manner that mirrors Type 2 diabetes, and hexosamines mimic many of these effects. This has led to the hypothesis that cells use hexosamine flux as a glucose- and
Excessive visceral fat accumulation is a primary risk factor for metabolically unhealthy obesity and related diseases. The visceral fat is highly susceptible to the availability of external nutrients. Nutrient flux into the hexosamine biosynthetic pathway leads to protein posttranslational
We examined whether acute in vivo increases in either plasma glucose or insulin concentrations stimulate PAI-1 gene expression in fat tissue. We studied chronically catheterized unstressed and awake, lean (approximately 300 g, n=12) and obese (approximately 450 g, n=12) Sprague-Dawley rats.
The aim of the present study was to elucidate the mechanisms of development of cholesterol crystals and gallstones during weight reduction in obese subjects. Twenty-five morbidly obese, gallstone-free subjects underwent vertical-banded gastroplasty. Gallbladder bile was collected at the time of the