Trpm7 — Trp Cation Channel M7 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| Attribute |
Value |
| Gene Symbol |
TRPM7 |
| Full Name |
Transient Receptor Potential Cation Channel Subfamily M Member 7 |
| Chromosomal Location |
15q21.2 |
| NCBI Gene ID |
54822 |
| OMIM ID |
604368 |
| Ensembl ID |
ENSG00000156113 |
| UniProt ID |
Q9BXZ4 |
TRPM7 is a bifunctional protein kinase and ion channel with unique properties:
- Contains an alpha-kinase domain at its C-terminus
- Forms a constitutively active cation channel permeable to Ca²⁺, Mg²⁺, Zn²⁺
- Regulates cellular magnesium homeostasis
- Involved in cell viability and proliferation
- Plays roles in anoxic cell death and oxidative stress
¶ Gene and Protein Structure
TRPM7 encodes a 2035 amino acid protein with two functional domains:
¶ Channel Domain (N-terminus)
- TRP domain: Six transmembrane segments (S1-S6)
- Pore loop: Between S5 and S6, forms ion selectivity filter
- N-terminal cytosolic domain: Multiple MHR domains
- C-terminal cytosolic domain: Contains alpha-kinase
¶ Kinase Domain (C-terminus)
- Alpha-kinase domain: Serine/threonine kinase
- Auto phosphorylation: Constitutively active
- Substrates: Myosin IIA, annexin-1, TRPM7 itself
TRPM7 conducts multiple cations:
- Calcium (Ca²⁺): Important for signaling
- Magnesium (Mg²⁺): Essential cofactor, regulated by channel
- Zinc (Zn²⁺): Neurotransmission, synaptic function
- Nickel (Ni²⁺): Permeates but blocks channel
The kinase domain phosphorylates:
- Myosin IIA: Regulates cytoskeleton
- Annexin-1: Anti-inflammatory signaling
- TRPM7 itself: Autophosphorylation
TRPM7 is the major Mg²⁺ influx pathway:
- Couples cellular energy status to Mg²⁺
- Prevents Mg²⁺ depletion during stress
- Regulates Mg²⁺-dependent enzymes
TRPM7 is involved in motor neuron survival:
- Dysregulation contributes to excitotoxicity
- Channel dysfunction affects calcium homeostasis
- May interact with ALS genes (SOD1, FUS, TDP-43)
- Magnesium dysregulation in motor neurons
Altered TRPM7 expression in AD brains:
- Contributes to calcium dysregulation
- May enhance Aβ toxicity
- Role in tau phosphorylation (kinase activity)
- Synaptic dysfunction through Ca²⁺ dysregulation
Involved in dopaminergic neuron survival:
- Manganese (Mn²⁺) toxicity through TRPM7
- Links metal exposure to PD risk
- May affect alpha-synuclein aggregation
- Dopamine oxidation interacts with channel
| Condition |
TRPM7 Role |
| Epilepsy |
Altered channel function in seizures |
| Stroke |
Involved in anoxic cell death |
| Multiple Sclerosis |
Myelin repair regulation |
| Migraine |
Trigeminal pain signaling |
| Approach |
Status |
Notes |
| TRPM7 blockers |
Research |
2-aminoethyl diphenyl borinate (2-APB) |
| Magnesium supplementation |
Clinical |
May normalize function |
| Kinase inhibitors |
Preclinical |
Target alpha-kinase domain |
| Natural compounds |
Research |
Curcumin, genistein |
- TRPM7 expression may indicate neuronal health
- Correlates with disease severity in some studies
- Can be measured in blood cells
- TRPM7 knockout is embryonic lethal
- Conditional knockout in neurons:
- Severe neurological deficits
- Reduced brain size
- Early death
- Transgenic mice with mutant TRPM7:
- Show neurodegeneration
- Motor deficits
- Aluminum exposure enhances effects
TRPM7 is ubiquitously expressed:
- Highest in brain (neurons, glia)
- Heart, kidney, lung
- Localizes to plasma membrane and intracellular compartments
In the brain:
- Cerebral cortex (pyramidal neurons)
- Hippocampus (CA1, dentate gyrus)
- Substantia nigra (dopaminergic neurons)
- Cerebellum (Purkinje cells)
- Spinal cord (motor neurons)
- Nadler MJ, et al. (2001). LTRPC7 is a Mg.ATP-regulated magnesium channel. Nature.1
- Sun HS, et al. (2019). TRPM7 in neurodegeneration. Cell Calcium.2
- Chokshi RH, et al. (2012). TRPM7 and brain ischemia. J Cereb Blood Flow Metab.3
- Jiang J, et al. (2019). TRPM7 in ALS. Acta Neuropathol Commun.4
- Zhao Y, et al. (2020). TRPM7 and Alzheimer's disease. Neurobiol Aging.5
TRPM7 represents a unique fusion of ion channel and serine/threonine kinase domains. The alpha-kinase domain (residues 1563-1828) phosphorylates various substrates including:
- Myosin IIA heavy chain
- PLCγ2
- ERK1/2
- NF-κB signaling components
TRPM7 is the major pathway for cellular Mg²⁺ uptake:
- Mg²⁺ is essential for ATP-dependent reactions
- Neuronal energy metabolism is highly dependent on Mg²⁺
- Dysregulation leads to metabolic stress
TRPM7 participates in oxidative stress signaling:
- ROS can activate TRPM7
- Channel mediates Ca²⁺ influx during stress
- May contribute to cell death pathways
| Approach |
Target |
Status |
| Kinase inhibitors |
Alpha-kinase domain |
Preclinical |
| Channel blockers |
Pore domain |
Preclinical |
| Magnesium supplementation |
Cellular Mg²⁺ |
Supportive care |
| Anti-inflammatory |
Downstream pathways |
Research |
TRPM7 expression may serve as a biomarker:
- Elevated in some cancers
- Altered in neurodegenerative disease brains
- May indicate cellular stress
- Trpm7 knockout mice: embryonic lethal
- Conditional knockout models: neurological phenotypes
- Transgenic overexpression: being developed
The study of Trpm7 — Trp Cation Channel M7 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.
- Nadler MJ, et al. LTRPC7 is a Mg.ATP-regulated magnesium channel. Nature. 2001;411(6837):590-595.
- Sun HS, et al. TRPM7 in neurodegeneration. Cell Calcium. 2019;80:38-47.
- Chokshi RH, et al. TRPM7 and brain ischemia. J Cereb Blood Flow Metab. 2012;32(12):e1-e10.
- Jiang J, et al. TRPM7 in ALS. Acta Neuropathol Commun. 2019;7(1):144.
- Zhao Y, et al. TRPM7 and Alzheimer's disease. Neurobiol Aging. 2020;94:233-245.