The Role of De novo Serine Biosynthesis from Glucose in Papillary Thyroid Cancer
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Background and Objectives: The de novo serine biosynthetic pathway from glucose has emerged as one of cancer metabolism; however, it is not explored the interplay between papillary thyroid cancer and metabolic flux of de novo serine synthesis. In this study, we explored the interplay between glucose utilization via GLUT1 expression and phosphoglycerate dehydrogenase (PHGDH). Materials and Methods: The Cancer Genome Atlas (TCGA) database was used to determine the association between glucose importation and the serine metabolic pathway. The effects of glucose on serine biosynthesis and the role of PHGDH were investigated in papillary thyroid cancer cell lines. PHGDH and GLUT1 expression in 230 patients with papillary thyroid cancer (PTC) was explored using immunohistochemistry to explore the impact of the de novo serine biosynthetic pathway from glucose. Results: Glucose importation was significantly correlated with the serine biosynthetic and L-serine metabolic processes. Glucose uptake and serine synthesis were significantly increased and mitochondrial complex expression was upregulated in PTC cell lines grown in high-glucose media. Knockdown and inhibition of PHGDH decreased cell migration associated with glucose utilization. High PHGDH expression is significantly related with tumor aggressiveness and GLUT1 expression in patients with PTC. Conclusion: In this study, we demonstrated that de novo serine biosynthesis from glucose is highly expressed in papillary thyroid cancer and associated with cancer cell metastasis through glucose utility. Our findings suggest the link between glucose utilization PHGDH to regulate tumor aggressiveness in PTC.
Abstract
Background and Objectives: The de novo serine biosynthetic pathway from glucose has emerged as one of cancer metabolism; however, it is not explored the interplay between papillary thyroid cancer and metabolic flux of de novo serine synthesis. In this study, we explored the interplay between glucose utilization via GLUT1 expression and phosphoglycerate dehydrogenase (PHGDH). Materials and Methods: The Cancer Genome Atlas (TCGA) database was used to determine the association between glucose importation and the serine metabolic pathway. The effects of glucose on serine biosynthesis and the role of PHGDH were investigated in papillary thyroid cancer cell lines. PHGDH and GLUT1 expression in 230 patients with papillary thyroid cancer (PTC) was explored using immunohistochemistry to explore the impact of the de novo serine biosynthetic pathway from glucose. Results: Glucose importation was significantly correlated with the serine biosynthetic and L-serine metabolic processes. Glucose uptake and serine synthesis were significantly increased and mitochondrial complex expression was upregulated in PTC cell lines grown in high-glucose media. Knockdown and inhibition of PHGDH decreased cell migration associated with glucose utilization. High PHGDH expression is significantly related with tumor aggressiveness and GLUT1 expression in patients with PTC. Conclusion: In this study, we demonstrated that de novo serine biosynthesis from glucose is highly expressed in papillary thyroid cancer and associated with cancer cell metastasis through glucose utility. Our findings suggest the link between glucose utilization PHGDH to regulate tumor aggressiveness in PTC.
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