Abstract
Purpose
Breast cancer is the most common type of cancer affecting women worldwide. Phosphoglycerate dehydrogenase (PHGDH) is an oxidoreductase in the serine biosynthesis pathway. Although it has been reported to affect growth of various tumors, its role in breast cancer is largely unknown. This study aimed to analyze the expression of PHGDH in breast cancer tissue samples and to determine if PHGDH regulates breast cancer cell proliferation.
Methods
Tissue microarrays consisting of 305 cases of breast invasive ductal carcinoma were used for immunohistochemical evaluation of PHGDH expression. The role of PHGDH in breast cancer was investigated in vitro by knocking down its expression and determining the effect on cell proliferation and cell cycling, and in ovo by using a chorioallantoic membrane (CAM) assay.
Results
Immunohistochemical examination showed that PHGDH is mainly localized in the cytoplasm of breast cancer cells and significantly associated with higher cancer grade, larger tumor size, increased PCNA expression, and lymph node positivity. Analysis of the GOBO dataset of 737 patients demonstrated that increased PHGDH expression was associated with poorer overall survival. Knockdown of PHGDH expression in breast cancer cells in vitro resulted in a decrease in cell proliferation, reduction in cells entering the S phase of the cell cycle, and downregulation of various cell cycle regulatory genes. The volume of breast tumor in an in ovo CAM assay was found to be smaller when PHGDH was silenced.
Conclusion
The findings suggest that PHGDH has a regulatory role in breast cancer cell proliferation and may be a potential prognostic marker and therapeutic target in breast cancer.
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Acknowledgements
This study was supported by a research Grant NMRC/CIRG/1370/2013 from the National Medical Research Council of Singapore. The authors thank Pei Fern Angele Koh for technical assistance in the CAM Assay.
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Ethics approval 2018/2998 (2011/433/F) for the study was obtained from the SingHealth Centralized Institutional Review Board.
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Informed consent was waived for this study as only anonymized analysis was performed.
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Chandrika, M., Chua, P.J., Muniasamy, U. et al. Prognostic significance of phosphoglycerate dehydrogenase in breast cancer. Breast Cancer Res Treat 186, 655–665 (2021). https://doi.org/10.1007/s10549-021-06123-9
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DOI: https://doi.org/10.1007/s10549-021-06123-9