Extracellular adenosine mediates a systemic metabolic switch during immune response

Area of Science:

• Immunology
• Metabolic regulation
• Insect biology

Background:

• Immune responses require significant energy, necessitating metabolic adaptations.
• Drosophila melanogaster serves as a model organism for studying host-pathogen interactions.
• Parasitoid wasp infection in Drosophila triggers the production of lamellocytes for defense.

Purpose of the Study:

• To investigate energy reallocation mechanisms during immune responses in Drosophila.
• To understand the role of adenosine in mediating metabolic changes during infection.
• To determine the impact of adenosine signaling on host resistance.

Main Methods:

• Inducing natural infection of Drosophila with a parasitoid wasp.
• Analyzing nutrient allocation towards lamellocyte differentiation.
• Investigating the role of extracellular adenosine and its receptors in metabolic regulation.
• Assessing host resistance following manipulation of adenosine transport or signaling.

Main Results:

• A significant portion of nutrients is diverted to lamellocyte differentiation at the expense of development.
• Extracellular adenosine released by immune cells mediates this systemic metabolic switch.
• Blocking adenosine transport or its receptor function impairs the metabolic switch and host resistance.
• Adenosine signaling prioritizes immune cell energy demands over host development.

Conclusions:

• Adenosine acts as a critical signal from immune cells to orchestrate metabolic adaptation during infection.
• This adenosine-mediated metabolic reprogramming is essential for effective immune defense and host survival.
• The findings highlight a trade-off between immune response and host development, regulated by adenosine.