| Protein Name |
TRPV4 |
| Gene |
TRPV4 |
| UniProt ID |
Q9HBA0 |
| Molecular Weight |
~98 kDa (871 amino acids) |
| Subcellular Localization |
Plasma membrane, Endoplasmic reticulum, Primary cilia |
| Protein Family |
TRP (Transient Receptor Potential) channel family, TRPV subfamily |
| Structure |
6 transmembrane domains, tetrameric assembly |
| Associated Diseases |
Alzheimer's Disease, Parkinson's Disease, Peripheral Neuropathy |
TRPV4 (Transient Receptor Potential Vanilloid 4) is a member of the TRPV subfamily of polymodal cation channels. Encoded by the TRPV4 gene, this channel integrates multiple physical and chemical stimuli to regulate calcium homeostasis and cellular signaling in the nervous system [1][2].
TRPV4 is notable for its ability to respond to diverse stimuli including mechanical force, temperature, osmotic pressure, and chemical effectors. This polymodality makes it uniquely positioned to sense and respond to environmental changes in both physiological and pathological contexts [3].
TRPV4 forms a tetrameric channel with each subunit comprising:
- N-terminal domain - Contains 6 ankyrin repeat domains
- Transmembrane domain - 6 segments (S1-S6)
- TRP domain - Conserved helix following S6
- C-terminal tail - Regulatory regions including phosphorylation sites
-
Ankyrin Repeat Domain (ARD)
- Six ankyrin repeats in the N-terminus
- Protein-protein interaction sites
- Site for regulatory modifications
-
Voltage Sensor-Like Domain (VSLD)
- S1-S4 segments
- Involved in stimulus sensing
-
Pore Domain
- S5-S6 with intervening pore loop
- Ion selectivity filter
- Target of pharmacological agents
TRPV4 is regulated by:
- Phosphorylation - PKA, PKC, CaMKII sites
- Glycosylation - N-linked glycosylation
- Palmitoylation - Membrane association
TRPV4 responds to multiple stimuli:
-
Physical
- Temperature (24-34°C range)
- Mechanical stretch
- Osmotic swelling
-
Chemical
- 4α-PDD (phorbol derivative)
- GSK1016790A (selective agonist)
- RN-1734 (antagonist)
-
Physiological
- Flow/shear stress in endothelial cells
- Bladder distension
- Pain modalities
In the nervous system, TRPV4:
- Modulates neuronal excitability
- Regulates calcium-dependent signaling
- Controls neurotransmitter release
- Participates in sensory transduction
TRPV4 contributes to AD through:
-
Calcium Dyshomeostasis
- Enhanced channel activity in neurons
- Amplifies amyloid-beta toxicity
- Disrupts calcium-dependent synaptic plasticity
-
Vascular Dysfunction
- Endothelial TRPV4 regulates BBB function
- Impaired neurovascular coupling
-
Neuroinflammation
- Microglial activation
- Cytokine release
In PD:
- Expressed in dopaminergic neurons
- May contribute to calcium dysregulation
- Linked to oxidative stress responses
- Mutations cause hereditary neuropathy (CMT2C)
- Involved in diabetic neuropathy
- Chemotherapy-induced neuropathy
Multiple TRPV4-targeted compounds are in development:
-
Agonists
- GSK1016790A - potent agonist
- Used for studying channel function
-
Antagonists
- RN-1734, RN-9893
- HC-067047
- Selected for clinical development
TRPV4 modulators have been explored for:
- Pain disorders
- Cardiovascular conditions
- OAB (overactive bladder)
- Liedtke et al., TRPV4 osmosensation (2000)
- Nilius et al., TRPV4 pharmacology (2004)
- Jia et al., TRPV4 in AD models (2019)
- Zhang et al., TRPV4 and neuroinflammation (2021)
- TRPV4 gene and disease associations (2020)