Adenosine Receptor (A1 A2A) Neurons is an important cell type in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Adenosine receptor neurons are neurons that express adenosine receptors (A1, A2A, A2B, and A3) on their surface, making them responsive to adenosine signaling in the central nervous system. These receptors play crucial roles in regulating sleep-wake cycles, motor control, neuroprotection, and cognitive function. Adenosine receptors, particularly the A1 and A2A subtypes, have emerged as important therapeutic targets in neurodegenerative diseases, with A2A receptor antagonists like istradefylline approved for Parkinson's disease treatment. [1]
| Database | ID | Name | Confidence | [2]
|----------|----|------|------------| [3]
| Cell Ontology | CL:0000197 | sensory receptor cell | Medium | [4]
| Taxonomy | ID | Name / Label | [5]
|----------|----|---------------|
| Cell Ontology (CL) | CL:0000197 | sensory receptor cell |
The A1 adenosine receptor (A1R) is widely distributed throughout the central nervous system:
The A2A adenosine receptor (A2AR) has a more restricted distribution:
These subtypes have more limited expression:
A1 receptors couple to Gi/o proteins, leading to:
Physiological effects:
A2A receptors couple to Gs proteins, leading to:
Physiological effects:
Basal adenosine levels in the brain:
A2A receptors play a particularly important role in PD:
Therapeutic implications:
Adenosine receptors in AD:
Therapeutic potential:
Clinical use:
Mechanism:
Agonists:
Antagonists:
Non-selective adenosine receptor antagonist
Associated with reduced PD and AD risk
Cognitive enhancement at low doses
Sleep disruption at high doses
Cell-Types/Striatopallidal-Neurons — A2A-rich neurons in indirect pathway
Cell-Types/Cortical-Pyramidal-Neurons — A2A-expressing cortical neurons
Cell-Types/Hippocampal-Neurons — A1 receptor expression in hippocampus
Mechanisms/Neuroinflammation — A2A modulation of glial function
The study of Adenosine Receptor (A1 A2A) Neurons 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.
Fredholm BB et al. Adenosine receptors as drug targets. Pharmacol Rev. 2020. 2020. ↩︎
Cunha RA et al. Adenosine A2A receptors as therapeutic targets. J Med Chem. 2021. 2021. ↩︎
Gomes C et al. Adenosine A1 receptors in Alzheimer's disease. J Neurosci. 2020. 2020. ↩︎
Sebastião AM et al. Adenosine receptors in brain function. Prog Neuropsychopharmacol Biol Psychiatry. 2018. 2018. ↩︎
Li W et al. Caffeine and neurodegenerative disease. Nutrients. 2022. 2022. ↩︎