journal contribution
posted on 2024-11-18, 15:01 authored by Yani Pan, Yue Zhou, Yonghua Shen, Lei Xu, Hongwen Liu, Nannan Zhang, Tianlu Huang, Kui Meng, Yu Liu, Lishan Wang, Ge Bai, Qi Chen, Yun Zhu, Xiaoping Zou, Siliang Wang, Zhangding Wang, Lei Wang PYGB promotes CCA migration, invasion and metastasis.
Funding
National Natural Science Foundation of China (NSFC)
Natural Science Foundation of Jiangsu Province (Jiangsu Natural Science Foundation)
Nanjing Special Foundation for Health Science and Technology Development (Distinguished young program)
Nanjing Health Technology Development Foundation of Nanjing Municipal Health Commission
Graduate student scientific research innovation projects in Jiangsu Province
History
ARTICLE ABSTRACT
Cholangiocarcinoma (CCA) displays enhanced glycolysis, pivotal for fulfilling the heightened energy demands intrinsic to its malignant progression. Recent research has indicated that endogenous glycogen rather than exogenous glucose acts as the major carbon source for glycolysis, highlighting the need to better understand the regulation of glycogen homeostasis in CCA. Here, through comprehensive integrative analysis, we identified that glycogen phosphorylase brain form (PYGB), the main enzyme involved in glycogen homeostasis, was markedly upregulated in CCA tissues, serving as an independent prognostic indicator for human patients with CCA. Moreover, elevated PYGB expression potentiated cholangiocarcinogenesis and augmented CCA cell proliferation in both organoid and xenograft models. Hypoxia stimulated PYGB activity in a phosphoglycerate kinase 1–dependent manner, leading to glycogenolysis and the subsequent release of glucose-6-phosphate (G6P) and thereby facilitating aerobic glycolysis. Notably, a virtual screening pinpointed the β-blocker carvedilol as a potent pharmacologic inhibitor of PYGB that could attenuate CCA progression. Collectively, these findings position PYGB as a promising prognostic biomarker and therapeutic target for CCA. Significance: Cholangiocarcinoma cells exhibit high glycogen phosphorylase activity under hypoxic conditions that mediates metabolic reprograming to promote glycolysis and support tumor development.
