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Meal-feeding specifically induces obese mRNA expression

M P Thompson1

  • 1Department of Biochemistry, University of Otago, Dunedin, New Zealand. maryt@sanger.otago.ac.nz

Biochemical and Biophysical Research Communications
|July 16, 1996
PubMed

Insights

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.

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