- Bacteria differentially affect the C. elegans response to FUDR and camptothecin
- Bacterial metabolism is required for the C. elegans chemotherapeutic response
- Genetic screens with two bacterial species and three drugs to unravel mechanism
- 5-FU and FUDR affect C. elegans through bacterial RNA rather than DNA metabolism
The human microbiota greatly affects physiology and disease; however, the contribution of bacteria to the response to chemotherapeutic drugs remains poorly understood. Caenorhabditis elegans and its bacterial diet provide a powerful system to study host-bacteria interactions. Here, we use this system to study how bacteria affect the C. elegans response to chemotherapeutics. We find that different bacterial species can increase the response to one drug yet decrease the effect of another. We perform genetic screens in two bacterial species using three chemotherapeutic drugs: 5-fluorouracil (5-FU), 5-fluoro-2′-deoxyuridine (FUDR), and camptothecin (CPT). We find numerous bacterial nucleotide metabolism genes that affect drug efficacy in C. elegans. Surprisingly, we find that 5-FU and FUDR act through bacterial ribonucleotide metabolism to elicit their cytotoxic effects in C. elegans rather than by thymineless death or DNA damage. Our study provides a blueprint for characterizing the role of bacteria in the host response to chemotherapeutics.
García-González AP, Ritter AD, Shrestha S, Andersen EC, Yilmaz LS, Walhout AJM. (2017) Bacterial Metabolism Affects the C. elegans Response to Cancer Chemotherapeutics. Cell 169, 431-441.
From UMass Med NOW:
The bacteria residing in your digestive tract, or your gut microbiota, may play an important role in your ability to respond to chemotherapy drugs, according to a new study by scientists at UMass Medical School. Published in Cell, the study by Marian Walhout, PhD, and colleagues shows that when a common research model, the roundworm Caenorhabditis elegans, was fed a diet of E. coli bacteria, the worms were 100 times more sensitive to the chemotherapy drug floxuridine (FUDR) than worms who were fed different bacteria. FUDR is a commonly used drug to treat colorectal cancer. READ MORE…