Cancer cells have a distinct metabolism that supports their pathological proliferation. Targeting this metabolism has led to many of the existing chemotherapies in the clinic today such as antifolates. The amino acid glycine is primarily produced by folate metabolism, a pathway that is nearly universally upregulated in cancer. Glycine supports important biosynthetic processes including protein, purine and glutathione synthesis. In addition, glycine catabolic processes have recently been shown to be important in cancer stem cells and glioblastoma. In newly published data, I demonstrated that glycine-supported antioxidant production is crucial for cancer cell growth. This proposal seeks to quantitatively characterize glycine metabolism in cancer and to test the hypothesis that folate-mediated glycine synthesis supports glutathione production and thus redox homeostasis. In these efforts, I will benefit from a new small molecule that I discovered, which potently inhibits both isozymes of the glycine synthetic enzyme SHMT.
In Aim 1, I will use isotope tracers to quantitate glycine production and consumption fluxes in normal and cancer cells, and apply these findings in vivo.
In Aim 2, I will further develop the SHMT inhibitor and test it in a mouse model of B-cell lymphoma, a tumor type that is defective in glycine import and accordingly highly sensitive SHMT inhibition in vitro. Collectively, these experiments will lay the groundwork for targeting of glycine metabolism as a new therapeutic approach in cancer. Under the guidance of my primary mentor and my team of collaborators during the K99 period, this proposal will allow me to successfully transition from my current mentored position into a independent research group leader.

Public Health Relevance

Treatment for many advanced cases of advanced cancer relies upon chemotherapy, which target processes involved in the replication of DNA, but many patients are still not cured. Based on preliminary data collected, I hypothesize that targeting the production of antioxidants by blocking glycine metabolism is a novel and potentially useful therapeutic strategy. This proposal will test this hypothesis through the development of new anticancer compounds and their application to models of cancer.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Transition Award (R00)
Project #
5R00CA215307-05
Application #
10055956
Study Section
Special Emphasis Panel (NSS)
Program Officer
Willis, Kristine Amalee
Project Start
2018-12-01
Project End
2021-11-30
Budget Start
2020-12-01
Budget End
2021-11-30
Support Year
5
Fiscal Year
2021
Total Cost
Indirect Cost
Name
University of Utah
Department
Biochemistry
Type
Schools of Medicine
DUNS #
009095365
City
Salt Lake City
State
UT
Country
United States
Zip Code
84112