Ovary-Derived Signals Align Protein Appetite with Oogenesis

Area of Science:

• Reproductive Biology
• Neuroscience
• Metabolism

Background:

• Organismal homeostasis relies on coordinating organ metabolism with nutrient intake.
• Central hunger pathways are known, but peripheral organ influence on nutrient-specific appetite is unclear.

Purpose of the Study:

• Identify novel signaling axes linking peripheral organ physiology to nutrient-specific appetite.
• Investigate the ovary's role in modulating feeding behavior in Drosophila melanogaster.

Main Methods:

• Conducted a targeted germline RNAi screen in Drosophila melanogaster.
• Analyzed oogenesis progression, including vitellogenic follicle accumulation and mature oocyte counts.
• Assessed the role of the relaxin-like hormone Dilp8 and mating status.

Main Results:

• Ovarian perturbations disrupting oogenesis selectively increased yeast appetite.
• Decreased expression of Dilp8 correlated with increased yeast appetite.
• Ovarian regulation of appetite was independent of amino acid status but required mating.

Conclusions:

• Uncovered a novel signaling axis from the ovary regulating nutrient-specific appetite in fruit flies.
• Demonstrated the ovary's role as an active regulator of whole-organism nutritional decisions.
• Proposed a framework for reproductive tissue communication of physiological demands and potential conserved mechanisms in other animals.