NT5E (Ecto-5'-Nucleotidase), also known as CD73, is a glycosylphosphatidylinositol (GPI)-anchored cell surface enzyme that catalyzes the hydrolysis of extracellular nucleotides to adenosine. As the rate-limiting enzyme in adenosine production, CD73 plays pivotal roles in purinergic signaling, immune regulation, neuroprotection, and cellular energy balance. It is widely expressed on various cell types within the central nervous system (CNS), including neurons, astrocytes, microglia, oligodendrocytes, and endothelial cells, where it modulates synaptic transmission, neuroinflammation, and blood-brain barrier (BBB) function.
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title: NT5E Gene [2]
description: Gene page for Ecto-5'-Nucleotidase (CD73) [3]
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|---|---| [6]
| Gene Symbol | NT5E |
| Full Name | Ecto-5'-Nucleotidase |
| Chromosomal Location | 6q14.3 |
| NCBI Gene ID | 4904 |
| OMIM | 602872 |
| Ensembl ID | ENSG00000135318 |
| UniProt ID | P21589 |
CD73 is a glycosylphosphatidylinositol (GPI)-anchored cell surface enzyme that hydrolyzes extracellular nucleotides to adenosine. It plays critical roles in adenosine production, purinergic signaling, immune regulation, and neuroprotection. CD73 is expressed on various cell types including neurons, astrocytes, microglia, and endothelial cells, where it modulates synaptic transmission, neuroinflammation, and blood-brain barrier function.
NT5E/CD73 hydrolyzes extracellular AMP to adenosine, serving as the rate-limiting enzyme in adenosine production. This reaction regulates purinergic signaling through four adenosine receptor subtypes:
In the CNS, CD73-derived adenosine modulates:
CD73 has immunomodulatory properties:
Emerging evidence suggests CD73 participates in oligodendrocyte function and myelin maintenance, with implications for demyelinating diseases.
CD73 is a homodimeric enzyme, with each subunit consisting of:
The enzyme requires zinc ions for catalytic activity and has an allosteric site for regulatory interactions.
CD73 is implicated in Alzheimer's disease through multiple mechanisms:
CD73 has complex roles in multiple sclerosis:
Following cerebral ischemia:
NT5E is overexpressed in various cancers and promotes tumor progression through:
A2A receptor antagonists derived from caffeine have been investigated for:
CD73 inhibitors are being developed for:
CD73 agonists may have therapeutic potential for:
Current research focuses on:
The study of Nt5E Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.