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Area of Science:

  • Neuroscience
  • Genetics
  • Metabolic Research

Background:

  • Obesity is a complex metabolic disorder driven by appetite regulation.
  • Orexigenic neuropeptides play a crucial role in stimulating feeding behavior.
  • Developing effective preclinical models for obesity research is essential.

Purpose of the Study:

  • To investigate adeno-associated virus (AAV) gene delivery for inducing and reversing hyperphagia and obesity in mice.
  • To test the efficacy of genetic switches in controlling orexigenic peptide expression and subsequent weight changes.

Main Methods:

  • Utilized capsid-modified AAV vectors (AAV-PHP.eB, AAV-CAP.B10) for brain-targeted delivery of AgRP, NPY, ghrelin, and a leptin superantagonist.
  • Employed Cre-LoxP, TETOFF, and cumate genetic systems to regulate transgene expression for inducing and reversing hyperphagia.

Main Results:

  • Delivery of three out of four orexigenic peptides via AAV successfully induced severe obesity in mice.
  • Cre-mediated AgRP removal partially reversed weight gain, though confounded by tamoxifen effects.
  • TETOFF-mediated AgRP suppression halted weight gain but did not induce weight loss.
  • Cumate-induced AgRP expression was ineffective, suggesting poor blood-brain barrier penetration.

Conclusions:

  • Brain-targeted AAV delivery of orexigenic peptides provides a robust preclinical model for inducing obesity.
  • Genetic switch systems can control hyperphagic stimuli but do not guarantee significant weight loss upon removal.
  • Further research is needed to understand the mechanisms underlying the limited efficacy of reversing diet-induced obesity.