Alpha 1A Adrenergic Receptor is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Gq-coupled GPCR mediating sympathetic nervous system signaling in the brain
The ADRA1A protein is encoded by the ADRA1A gene and is a member of the Adrenergic receptor family (Class A GPCR). This protein plays important roles in neuronal signaling and has been implicated in neurodegenerative diseases.
| Attribute | Value |
|---|---|
| Protein Name | Alpha-1A Adrenergic Receptor |
| Gene | ADRA1A |
| UniProt ID | P35348 |
| PDB Structures | 5G53, 6J5J |
| Molecular Weight | 56 kDa |
| Subcellular Localization | Plasma membrane, postsynaptic densities |
| Protein Family | Adrenergic receptor family (Class A GPCR) |
The ADRA1A protein contains seven transmembrane helices typical of class A GPCRs, with an extracellular N-terminus and intracellular C-terminus. The ligand-binding pocket is located within the transmembrane domain. Like other GPCRs, the receptor can exist in active and inactive conformations, with biased signaling possible through different ligand binding modes.
The Alpha-1A adrenergic receptor (ADRA1A) is a Gq protein-coupled receptor that activates phospholipase C (PLC) upon norepinephrine or epinephrine binding. This leads to IP3/DAG production, calcium release from intracellular stores, and activation of protein kinase C (PKC). In neurons, ADRA1A signaling modulates neuronal excitability, regulates neurotransmitter release, and influences synaptic plasticity. The receptor plays important roles in memory consolidation, fear conditioning, and emotional regulation through its actions in the hippocampus and prefrontal cortex. ADRA1A activation can also trigger MAPK/ERK signaling cascades, influencing gene expression and long-term cellular adaptations.
Alzheimer's Disease (cognitive decline, neuroinflammation), Parkinson's Disease (levodopa-induced dyskinesias), PTSD (fear memory consolidation), hypertension
Terazosin and doxazosin (alpha-1A antagonists) are used for BPH and hypertension. These drugs have shown neuroprotective effects in preclinical Alzheimer's models by blocking tau aggregation and reducing neuroinflammation. Clinical trials are underway for terazosin in AD. Prazosin is used for PTSD nightmares.
The study of Alpha 1A Adrenergic Receptor 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.
Alpha-1A adrenergic receptors are widely distributed:
Alpha-1A activation triggers:
Alzheimer's Disease:
Parkinson's Disease:
Multiple System Atrophy:
Indications:
Side Effects: