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Hexosamines regulate leptin production in human subcutaneous adipocytes
R V Considine1, R C Cooksey, L B Williams
1Department of Medicine, Indiana University School of Medicine, Indianapolis 46202, USA. rconsidi@iupui.edu
The Journal of Clinical Endocrinology and Metabolism
|November 4, 2000
Summary
Hexosamine biosynthesis regulates leptin production in human adipose tissue. Increased pathway activity correlates with obesity and higher leptin levels, suggesting a nutrient-sensing mechanism.
Area of Science:
- Metabolic Regulation
- Adipose Tissue Biology
- Hormone Signaling
Background:
- The hexosamine biosynthetic pathway (HBP) is implicated in cellular nutrient sensing.
- Leptin, a key adipokine, plays a role in energy homeostasis and is dysregulated in obesity.
- Understanding the link between nutrient flux and leptin release is crucial for metabolic research.
Purpose of the Study:
- To investigate the role of hexosamines in regulating leptin production in human adipocytes.
- To examine the relationship between HBP activity, obesity, and leptin levels.
Main Methods:
- Measurement of adipose tissue UDP-N-acetylglucosamine and ob mRNA in lean and obese subjects.
- Correlation analysis between biochemical markers, BMI, and serum leptin.
- In vitro treatment of isolated adipocytes with glucosamine and HBP inhibitors.
Main Results:
- Obese subjects exhibited significantly higher adipose tissue UDP-N-acetylglucosamine and ob mRNA levels compared to lean subjects.
- Adipose tissue UDP-N-acetylglucosamine positively correlated with BMI and serum leptin.
- Glucosamine treatment increased leptin release from adipocytes, while HBP inhibition reduced it.
Conclusions:
- Hexosamine biosynthesis is a significant regulator of leptin production in human adipose tissue.
- The HBP may act as a nutrient-sensing pathway influencing leptin secretion.
- These findings provide insights into the metabolic underpinnings of obesity and leptin resistance.