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Laura Ewing, MS

Laura Ewing PDPT19
Predoctoral Fellowship in Pharmacology/Toxicology, 2019 University of Arkansas

Role of Methionine-Gut Microbiome Interaction in Radiation-Induced Gastrointestinal Toxicity


Radiation-induced gastrointestinal syndrome (RIGS) is the primary factor limiting the dose-range and duration of radiotherapy treatment, leading to the cessation of treatment and poorer longterm outcomes. RIGS is exacerbated by various comorbidities, including poor diet, infections, inflammation, and genetic polymorphisms in DNA repair mechanisms. Radiation also affects the microbiome, favoring microbial populations that could produce infections or endotoxins. Even single dietary changes, such as supplementing methionine, exacerbate normal tissue toxicity and changes in gut ecology after radiation. Thus, this project proposes to study the mechanisms of toxicity underlying methionine supplementation, the microbiome, and the development of RIGS utilizing stereotactic body radiotherapy. To understand how methionine and disturbances in gut ecology alter the development of RIGS symptoms, a variety of novel techniques will be used, including next-generation and third-generation metagenomic, metatranscriptomic, and metabolomic approaches, to characterize microbial populations and methionine metabolism in internal organs before and after irradiation and under different doses of methionine. These data will be used to parameterize a computational model relating tissue concentration to external Met and radiation doses in mice to translate the findings to humans in order to develop mitigation strategies.

I was honored and excited to receive my letter from the PhRMA Foundation, offering me the fellowship. This fellowship has allowed me to include additional experiments into my dissertation research and relieved a financial burden. The recognition of receiving this award has also made me more competitive when applying for postdoctoral positions in government and industry research, and for that, I am very grateful.

Laura Ewing

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