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Meal-feeding specifically induces obese mRNA expression
1Department of Biochemistry, University of Otago, Dunedin, New Zealand. maryt@sanger.otago.ac.nz
Biochemical and Biophysical Research Communications
|July 16, 1996
Summary
Meal-feeding rapidly increases leptin (ob) mRNA in rat fat tissue. This response, dependent on gene transcription, is specific to leptin and not other lipid metabolism genes.
Area of Science:
- Biochemistry
- Molecular Biology
- Physiology
Background:
- Leptin (ob) is a key hormone in regulating energy balance and metabolism.
- Understanding the regulation of leptin gene expression is crucial for metabolic research.
Purpose of the Study:
- To investigate the effect of meal-feeding on leptin mRNA expression in rat adipose tissue.
- To determine the specificity of this response and its dependence on transcription.
Main Methods:
- Rats were subjected to controlled meal-feeding protocols.
- Quantitative analysis of ob mRNA levels in adipose tissue using molecular techniques.
- Inhibition of transcription using actinomycin-D to assess gene regulation.
Main Results:
- A high-carbohydrate meal induced a 5-fold increase in adipose tissue ob mRNA within 3 hours.
- The induced ob mRNA levels declined rapidly with a half-life under 2 hours.
- Actinomycin-D blocked the meal-induced increase in ob mRNA, indicating transcriptional control.
- mRNA levels for other lipid metabolism genes remained unchanged post-meal.
Conclusions:
- Meal-feeding, particularly high-carbohydrate meals, specifically and rapidly upregulates leptin gene expression in rat adipose tissue.
- Leptin mRNA induction by feeding is a transcription-dependent process.
- This regulatory mechanism highlights the intricate link between nutrient intake and leptin signaling in metabolic homeostasis.