Enolase 2 (ENO2)

Enolase 2 (ENO2), also known as Gamma-enolase or Neuron-specific enolase (NSE), is a cytoplasmic metalloenzyme found predominantly in mature neurons and neuroendocrine cells. It catalyzes a key step in glycolysis: the interconversion of 2-phosphoglycerate to phosphoenolpyruvate. In addition to its metabolic role, ENO2 supports neuronal survival, differentiation, and axonal regeneration through neurotrophic signaling pathways (PI3K, MAPK). Expression is largely restricted to neurons and neuroendocrine-derived cells, and levels increase during neural maturation, replacing the alpha-enolase isoform in the brain. ENO2 is widely used as a diagnostic and prognostic biomarker for neuroendocrine tumors and neuronal injury. Its involvement in tumor cell metabolism and migration has made it a research target in oncology and neuroscience. Although there are currently no specific clinical drugs targeting ENO2, broad-spectrum enolase inhibitors exist for research. Safety concerns for ENO2 inhibition focus on the risk of impairing essential energy-producing pathways in neurons, which could be detrimental to neural health.

Other names

Gamma-enolaseNeuron-specific enolaseNSENeural enolase2-phospho-D-glycerate hydro-lyaseneuronal enriched enolaseneurone-specific enolaseepididymis secretory protein Li 279

For drugs (general enolase inhibitors): competitive inhibition of the catalytic activity, blocking the glycolytic pathway and ATP production (primarily for research)