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PYGB
PYGB Full Name
phosphorylase, glycogen
PYGB Introduction
Phosphorylase, glycogen (PYGB) is a critical enzyme involved in glycogen metabolism, predominantly expressed in brain and various tumor tissues. Functionally, PYGB catalyzes the rate-limiting step of glycogen breakdown, converting glycogen into glucose-1-phosphate, which subsequently enters glycolysis to provide energy for cellular processes. Beyond its classical metabolic role, recent studies have highlighted PYGB as a key regulator of cancer cell metabolism, linking energy production with tumor proliferation, invasion, and survival. Its overexpression has been consistently observed in multiple malignancies, including lung, pancreatic, and cholangiocarcinomas, suggesting its potential as a biomarker for disease progression and prognosis.
Emerging evidence indicates that PYGB contributes to tumor progression not only by enhancing metabolic flux but also by modulating critical signaling pathways and the tumor immune microenvironment. In pancreatic cancer, for instance, PYGB activates the MAPK/ERK signaling cascade, driving cell proliferation, invasion, and metastasis, while in lung cancer, elevated PYGB expression correlates with poor patient outcomes and significant changes in immune cell infiltration, immune checkpoint expression, tumor mutation burden, and microsatellite instability. Additionally, in cholangiocarcinoma, hypoxic conditions stimulate PYGB enzymatic activity, promoting glycogen degradation to glucose-6-phosphate, which fuels aerobic glycolysis and tumor growth, highlighting its role in metabolic adaptation under stress.
From a therapeutic perspective, PYGB represents a promising drug target for both oncology and neuroprotection. Preclinical studies have identified specific inhibitors, such as the β-blocker carvedilol, that effectively suppress PYGB activity and tumor progression. Pharmacokinetic analyses using UHPLC–MS/MS methods have facilitated the characterization of these inhibitors, supporting their potential clinical translation. Moreover, PYGB overactivation has been implicated in ischemic brain injury, suggesting that targeted inhibition may provide neuroprotective benefits. Collectively, these findings position PYGB at the intersection of metabolic reprogramming, signaling regulation, and immune modulation, making it an attractive candidate for precision medicine strategies in cancer and beyond.
Alternate Names for PYGB
PYGB; phosphorylase, glycogen; brain; GPBB; glycogen phosphorylase, brain form; glycogen phosphorylase B;
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