Indole-associated predator-prey interactions between the nematode Caenorhabditis elegans and bacteria

Area of Science:

• Microbiology
• Nematology
• Biochemistry

Background:

• Indole is a crucial signaling molecule in various environments.
• Caenorhabditis elegans is a model organism for studying host-microbe interactions.
• The impact of indole on animal behavior is not well understood.

Purpose of the Study:

• To investigate the effects of indole and indole-producing bacteria on C. elegans behavior.
• To explore indole's role in bacteria-nematode interactions.
• To understand C. elegans's response and detoxification mechanisms to indole.

Main Methods:

• Behavioral assays for chemotaxis and egg-laying.
• Analysis of indole derivatives' effects on C. elegans.
• Gene expression analysis (transcriptional analysis) of C. elegans exposed to indole.

Main Results:

• C. elegans exhibits chemotaxis towards indole and indole-producing bacteria.
• Indole and its derivatives modulate C. elegans chemotaxis, egg-laying, and survival.
• High indole concentrations are toxic, but C. elegans can detoxify indole via oxidation and glucosylation.
• Indole up-regulates detoxification genes (cytochrome P450s, UDP-glucuronosyltransferases, glutathione S-transferase) and down-regulates collagen and F-box genes.

Conclusions:

• Indole and its derivatives act as significant signaling molecules in bacteria-nematode interactions.
• C. elegans possesses mechanisms to sense, respond to, and detoxify indole.
• These findings provide insights into the chemical communication between microbes and nematodes.