During one step of de novo lipid synthesis, SCD converts saturated fatty acids to monounsaturated fatty acids. Previously, Christian Badr, PhD, an assistant in Neuroscience at MGH and an assistant professor of Neurology at Harvard Medical School, and his colleagues showed that glioblastoma cells depend on activation of SCD and the availability of monounsaturated fatty acids.
In this new research, the team tested the anti-glioblastoma potential of an SCD inhibitor, YTX-7739, that can cross the blood brain barrier and is being evaluated as an oral drug in phase I clinical trials for the treatment of patients with Parkinson’s disease.
By blocking SCD, the cells accumulated too many saturated fatty acids, a process referred to as lipotoxicity. Also, when administered to mice with tumors, YTX-7739 inhibited processes involved in fatty acid metabolism in glioblastoma cells and increased the cells’ sensitivity to conventional glioblastoma chemotherapy.
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When examining the detailed mechanisms behind YTX-7739’s effects on cells, the scientists found that the MEK/ERK signaling pathway renders glioblastoma cells particularly vulnerable to YTX-7739, whereas the AMPK signaling pathway acts to protect glioblastoma cells and can make them resistant to the loss of de novo lipid synthesis that occurs when YTX-7739 is present.
“Based on our results, we propose that MEK/ERK and AMPK activities, which can be detected in tumor biopsies, could be predictive biomarkers to guide patient selection and stratification,” says Badr.
In other words, patients whose tumors have robust MEK/ERK activity would likely benefit from therapies such as YTX-7739, whereas those with high AMPK activity likely would not. “Our findings should also help tailor treatment paradigms to maximize therapeutic efficacy.
For instance, some widely used drugs, such as the anti-inflammatory agent salicylate or the anti-diabetic compound metformin, are potent activators of AMPK and could be detrimental to the efficacy of YTX-7739 or other de novo lipid synthesis-targeting therapies,” says Badr.
Additional co-authors include Katharina M. Eyme, Alessandro Sammarco, Roshani Jha, Hayk Mnatsakanyan, Caline Pechdimaljian, Litia Carvalho, Rudolph Neustadt, Charlotte Moses, Ahmad Alnasser, Daniel F. Tardiff, Baolong Su, Kevin J. Williams, Steven J. Bensinger, and Chee Yeun Chung.
This work was supported by the National Institutes of Health, the Department of Defense, the American Brain Tumor Association, and the Concern Foundation.
Source: Eurekalert
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