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Central leptin gene therapy blocks ovariectomy-induced adiposity
Rita Torto1, Stéphane Boghossian, Michael G Dube
1Departments of Physiology, University of Florida McKnight Brain Institute, P.O. Box 100244, Gainesville, FL 32610-0244, USA.
Obesity (Silver Spring, Md.)
|September 22, 2006
Summary
Ovariectomy (ovx) causes weight gain due to reduced leptin restraint. Increasing leptin expression in the hypothalamus after ovx effectively controls weight gain and reduces adiposity by restoring central regulation.
Area of Science:
- Endocrinology
- Neuroscience
- Metabolic Regulation
Background:
- Ovariectomy (ovx) in rats leads to weight gain and increased adiposity.
- This is hypothesized to be due to insufficient leptin signaling in the hypothalamus.
- Leptin, a key hormone in appetite and metabolism, normally restrains weight gain.
Purpose of the Study:
- To test if hypothalamic leptin insufficiency drives post-ovariectomy weight gain.
- To evaluate if enhanced leptin transgene expression can overcome this leptin deficiency.
- To investigate the restoration of central control over weight and adiposity.
Main Methods:
- Rats underwent ovariectomy (ovx) or were controls.
- Recombinant adeno-associated viral vectors encoding leptin (rAAV-lep) or GFP (control) were injected intracerebroventricularly.
- Body weight, food intake, white adipose tissue (WAT) mass, and serum adipokines were analyzed.
Main Results:
- Intracerebroventricular rAAV-lep injection post-ovx blocked hyperphagia and weight gain.
- Leptin transgene expression significantly reduced WAT mass and serum leptin and adiponectin levels.
- These effects were observed in both acutely and chronically ovariectomized rats.
Conclusions:
- Enhanced hypothalamic leptin expression effectively counteracts weight gain and adiposity after ovariectomy.
- This suggests that leptin insufficiency at the hypothalamic level contributes to post-ovariectomy metabolic changes.
- Ectopic leptin expression can reinstate central control of weight and adiposity in the absence of ovarian steroids.
