The insulin receptor substrate Chico regulates antibacterial immune function in Drosophila

Area of Science:

• Immunology
• Genetics
• Aging Research

Background:

• Studies reveal interplay between immunity and aging mechanisms in model organisms.
• Insulin/IGF signaling pathway inhibition and mutations in insulin receptor substrate Chico affect lifespan and pathogen survival in Drosophila melanogaster.

Purpose of the Study:

• Investigate immune phenotypes, signaling activation, and immune function in chico mutant adult flies.
• Assess chico mutant response to virulent Photorhabdus luminescens and non-pathogenic Escherichia coli.

Main Methods:

• Utilized chico loss-of-function mutant Drosophila melanogaster.
• Infected flies with P. luminescens and E. coli.
• Analyzed bacterial cell numbers, antimicrobial peptide gene expression, phenoloxidase activity, melanization, and phagocytosis.

Main Results:

• Chico mutant flies had fewer bacterial cells post-infection compared to controls.
• Reduced transcript levels of antimicrobial peptide genes were observed in chico mutants.
• Increased phenoloxidase activity and melanization, with reduced phagocytosis, were noted in chico mutants.

Conclusions:

• Chico plays a novel role in regulating antibacterial immune function in Drosophila melanogaster.
• Findings contribute to understanding the link between aging and immunity.
• Identifies molecular host components modulating both aging and immunity.