Necrosis by Sodium Overload (NECSO): TRPM4-Mediated Na⁺ Overload, ATP Depletion, and Experimental Validation
Necrosis by Sodium Overload (NECSO): TRPM4-Mediated Na⁺ Overload, ATP Depletion, and Experimental Validation
Necrosis by sodium overload (NECSO) is a form of necrotic cell death caused by sustained activation of transient receptor potential melastatin 4 (TRPM4). It is characterized by massive Na⁺ influx, membrane depolarization, osmotic imbalance, and cellular swelling and is accompanied by disruption of mitochondrial ion homeostasis, impaired oxidative phosphorylation, and ATP depletion. NECSO provides a new mechanistic framework for investigating the connections among ion homeostasis, energy metabolism, and cell death.
Keywords: necrosis by sodium overload; NECSO; TRPM4; sodium overload; membrane depolarization; mitochondria; ATP depletion; necrosis
1 Sodium Homeostasis and the TRPM4 Channel
1.1 Intracellular Sodium Homeostasis
The extracellular Na⁺ concentration is substantially higher than the intracellular concentration. The resulting transmembrane electrochemical gradient is maintained collectively by the Na⁺/K⁺-ATPase, ion channels, and ion exchangers. The Na⁺ gradient participates in action potentials, nutrient transport, cell-volume regulation, and Ca²⁺ exchange. When sustained Na⁺ influx exceeds the cellular capacity for Na⁺ extrusion, it can alter the membrane potential, increase osmotic pressure, promote water influx, and cause organelle swelling.
1.2 Channel Properties of TRPM4
TRPM4 is a Ca²⁺-activated, nonselective monovalent cation channel that is primarily permeable to Na⁺ and K⁺ but not directly permeable to Ca²⁺. After the channel opens, Na⁺ influx promotes plasma membrane depolarization and alters the activity of voltage-dependent Ca²⁺ channels and other ion-transport systems. TRPM4 is both a downstream effector of Ca²⁺ signaling and a regulator capable of feeding back on Ca²⁺ homeostasis through changes in membrane potential.
1.3 From Sodium Overload to Cell Death
Transient TRPM4 opening participates in physiological electrical activity and signal transduction, whereas sustained opening may overwhelm cellular ion-regulatory capacity. Following massive Na⁺ entry, the Na⁺/K⁺-ATPase must continuously consume ATP to restore the ion gradient. When Na⁺ influx cannot be terminated, ATP consumption and impaired mitochondrial energy production can form a positive-feedback loop that ultimately causes collapse of the ion gradient and plasma membrane rupture.
2 Discovery and Definition of NECSO
2.1 Necrotic Cell Death Induced by NC1
Necrocide 1 (NC1) is a small-molecule compound capable of inducing death in certain human tumor cells at nanomolar concentrations. NC1-treated sensitive cells exhibit rapid swelling, organelle edema, increased plasma membrane permeability, and release of intracellular contents rather than the characteristic cell shrinkage, chromatin condensation, and apoptotic body formation associated with apoptosis, indicating that NC1 primarily induces necrotic cell death.
2.2 TRPM4 as a Direct Target of NC1
Genome-wide CRISPR–Cas9 screening showed that TRPM4 deficiency markedly reduces cellular sensitivity to NC1. Surface plasmon resonance analysis demonstrated that NC1 can bind directly to human TRPM4 protein, whereas whole-cell patch-clamp experiments showed that NC1 induces sustained and robust TRPM4-dependent currents. TRPM4 knockout simultaneously blocks Na⁺ accumulation, membrane depolarization, and cell death, establishing a causal relationship among NC1, TRPM4, and Na⁺ overload.
2.3 Structural Basis of NC1-Mediated TRPM4 Activation
Structural studies showed that NC1 binds to a hydrophobic pocket within the S1–S4 transmembrane domain of TRPM4 adjacent to the Ca²⁺-activation site and induces a conformational change resembling that produced by Ca²⁺ binding. Although NC1 can reduce the dependence of the channel on intracellular Ca²⁺, phosphatidylinositol 4,5-bisphosphate in the membrane remains necessary for stable channel opening. Mutation of critical binding residues markedly weakens both the TRPM4 current response and cell-death induction by NC1.
2.4 Differences Between Human and Mouse TRPM4
NC1 specifically activates human TRPM4, whereas mouse TRPM4 is insensitive to NC1 and is not effectively activated by the compound. Although human and mouse TRPM4 exhibit high sequence similarity and comparable tetrameric structures, amino acid differences within the transmembrane region and near the selectivity filter can alter NC1-induced conformational transmission. When mouse-derived cells or animal models are used, the ability of NC1 to activate TRPM4 in the corresponding species must be confirmed to avoid underestimating the NECSO phenotype because of species differences.
2.5 Working Definition of NECSO
Current research defines NECSO as a form of necrotic cell death in which sustained TRPM4 activation causes excessive Na⁺ influx, followed by membrane depolarization, osmotic imbalance, suppression of mitochondrial metabolism, ATP depletion, cellular swelling, and plasma membrane rupture. This process differs from simple acute membrane injury because it depends on a specific channel, the ionic environment, and a continuous metabolic execution process.
3 Molecular Execution Mechanisms of NECSO
3.1 Sustained Na⁺ Influx
Following NC1-mediated TRPM4 activation, intracellular Na⁺ levels increase rapidly while intracellular K⁺ levels decrease. Increasing the extracellular K⁺ concentration does not effectively prevent cell death. In contrast, replacing extracellular Na⁺ with isotonic N-methyl-D-glucamine markedly suppresses NC1-induced ionic changes, cellular swelling, and death, indicating that Na⁺ influx rather than K⁺ efflux is the critical initiating event in NECSO.
3.2 Coupling Between Membrane Depolarization and Ca²⁺ Signaling
Massive Na⁺ influx causes sustained plasma membrane depolarization and alters the opening state of voltage-dependent Ca²⁺ channels. Increased intracellular Ca²⁺ can promote TRPM4 activation, forming an amplification loop between Ca²⁺ signaling and Na⁺ influx. Dihydropyridine Ca²⁺ channel blockers can reduce sustained TRPM4 activation and subsequent cell death, indicating that upstream Ca²⁺ influx is an important requirement for maintaining NECSO in certain cells.
3.3 Increased Mitochondrial Na⁺ and Ca²⁺ Loss
Elevated cytosolic Na⁺ can drive mitochondrial Na⁺/Ca²⁺ exchange, increasing mitochondrial Na⁺ while promoting mitochondrial Ca²⁺ efflux. Decreased mitochondrial Ca²⁺ affects the regulation of metabolic enzymes such as pyruvate dehydrogenase, isocitrate dehydrogenase, and α-ketoglutarate dehydrogenase, weakening tricarboxylic acid cycle substrate supply to the respiratory chain and converting ionic imbalance into impaired energy metabolism.
3.4 Impairment of Oxidative Phosphorylation and the Tricarboxylic Acid Cycle
NECSO is accompanied by decreased mitochondrial membrane potential, reduced oxygen-consumption rate, respiratory-chain complex dysfunction, and accumulation of tricarboxylic acid cycle intermediates. Certain cells increase glycolytic energy production as a compensatory response, but the additional glycolytic ATP is insufficient to compensate for reduced mitochondrial ATP production and continuous ATP consumption by ion pumps. Total cellular ATP levels continue to decline progressively.
3.5 ATP Depletion and Ion-Pump Failure
The Na⁺/K⁺-ATPase continuously hydrolyzes ATP to extrude intracellular Na⁺ and import K⁺. When mitochondrial energy production is suppressed and ATP levels continue to decline, the Na⁺/K⁺-ATPase gradually loses its ability to maintain the ion gradient, creating a positive-feedback loop of Na⁺ overload, ATP consumption, ion-pump failure, and further Na⁺ accumulation.
3.6 Osmotic Swelling and Membrane Rupture
Increased intracellular Na⁺ raises cytosolic osmotic pressure and promotes water influx, causing cellular enlargement and swelling of the mitochondria, endoplasmic reticulum, Golgi apparatus, and nuclear envelope. As energy supply and membrane homeostasis continue to deteriorate, plasma membrane integrity is eventually lost, cytosolic components such as lactate dehydrogenase are released, and the cell progresses from reversible ionic imbalance to irreversible lytic death.
4 Differences Between NECSO and Other Forms of Cell Death
4.1 Distinction from Apoptosis
NECSO is primarily characterized by cellular and organelle swelling, increased plasma membrane permeability, and cell lysis. Apoptosis generally involves cell shrinkage, chromatin condensation, caspase cascade activation, and apoptotic body formation. Broad-spectrum caspase inhibitors do not effectively rescue NC1-induced cell death, indicating that caspase-dependent apoptosis is not its principal execution mechanism.
4.2 Distinction from Necroptosis
Classical necroptosis depends on the RIPK1–RIPK3–MLKL signaling axis. After oligomerization and translocation to the plasma membrane, MLKL alters membrane permeability. RIPK1 inhibitors such as Necrostatin-1 do not effectively prevent NC1-induced cell death, indicating that NECSO does not depend on the classical RIPK1–RIPK3–MLKL execution mechanism.
4.3 Distinction from Ferroptosis
Ferroptosis is characterized by uncontrolled iron-dependent lipid peroxidation, glutathione depletion, and impaired GPX4 function and can be inhibited by Ferrostatin-1, Liproxstatin-1, and iron chelators. These agents do not consistently block NC1-induced death, whereas removal of extracellular Na⁺ or TRPM4 knockout produces marked protection, indicating that NECSO is not caused by iron-dependent lipid peroxidation.
4.4 Distinction from Pyroptosis and Autophagy-Related Cell Death
Pyroptosis generally depends on inflammasomes, inflammatory caspases, and gasdermin-mediated pore formation, whereas autophagy-related cell death requires the autophagic machinery to participate in death execution. Gasdermin deficiency, inhibition of pyroptotic pathways, and treatment with chloroquine or 3-methyladenine do not adequately block the effects of NC1, indicating that these pathways are not the core execution mechanisms of NECSO.
4.5 Comparison of Major Forms of Cell Death
Form of Cell Death | Major Initiating Event | Key Molecules or Processes | Characteristic Terminal Features | Common Blocking Strategies |
NECSO | Sustained TRPM4 opening and Na⁺ influx | TRPM4, Na⁺ overload, mitochondrial dysfunction, ATP depletion | Cellular swelling, membrane depolarization, plasma membrane rupture | Na⁺-free conditions, TRPM4 knockout, inhibition of TRPM4 or upstream Ca²⁺ channels |
Apoptosis | Death-receptor or mitochondrial apoptotic signaling | Caspase-8, caspase-9, caspase-3 | Cell shrinkage, chromatin condensation, apoptotic bodies | Caspase inhibitors such as Z-VAD-FMK |
Necroptosis | Death-receptor signaling with suppression of caspase-8 | RIPK1, RIPK3, MLKL | Cellular swelling, MLKL-mediated membrane damage | Necrostatin-1 and RIPK3 or MLKL inhibitors |
Ferroptosis | Uncontrolled iron-dependent lipid peroxidation | System x_c⁻, GSH, GPX4, ACSL4 | Membrane lipid peroxidation, mitochondrial shrinkage | Ferrostatin-1, Liproxstatin-1, iron chelators |
Pyroptosis | Inflammasome or inflammatory caspase activation | NLRP3, caspase-1, GSDMD | Membrane pore formation, cellular swelling, inflammatory mediator release | Inflammasome, caspase-1, or gasdermin inhibitors |
Autophagy-related cell death | Persistently enhanced or dysregulated autophagic flux | ATG proteins, BECN1, LC3, lysosomal system | Abundant autophagic structures and loss of cellular function | Chloroquine, 3-methyladenine, or genetic intervention |
5 Chemical Regulation of NECSO
5.1 Experimental Induction by NC1
NC1 is currently an important chemical inducer used to investigate TRPM4-dependent NECSO. It can bind directly to human TRPM4 and induce sustained channel currents. Cellular sensitivity to NC1 depends on TRPM4 expression, channel conformation, Ca²⁺ signaling, extracellular Na⁺ concentration, and the state of energy metabolism. TRPM4 expression and basal ionic homeostasis should therefore be evaluated when NC1 is used.
5.2 Competitive Occupation of the TRPM4 Binding Pocket by Clotrimazole
Clotrimazole can enter a TRPM4-binding cavity similar to that occupied by NC1 and competitively occupy the corresponding site to reduce NC1-induced channel opening. This effect can decrease Na⁺ influx, membrane depolarization, and subsequent lytic cell death and is suitable for establishing a small-molecule competitive-blocking control. Because clotrimazole can also affect cytochrome P450 enzymes and other membrane proteins, its protective effects must still be interpreted together with genetic intervention targeting TRPM4.
5.3 Regulation of Upstream Ca²⁺ Signaling by Dihydropyridines
Dihydropyridine compounds such as cilnidipine, lacidipine, and lercanidipine can inhibit voltage-dependent Ca²⁺ channels and reduce the intracellular Ca²⁺ signals required to maintain sustained TRPM4 activation. Their site of action differs from the competitive occupation of the TRPM4-binding pocket by clotrimazole, allowing them to distinguish the respective contributions of upstream Ca²⁺ influx and direct TRPM4 activation to NECSO.
5.4 TRPM4 Channel Inhibitors
Glyburide and 9-phenanthrol are commonly used to inhibit TRPM4-associated currents and can serve as pharmacological controls in NECSO studies. Glyburide also inhibits ATP-sensitive K⁺ channels, whereas 9-phenanthrol may affect other ion channels. Protection by a single inhibitor cannot substitute for TRPM4 knockout, rescue, and patch-clamp validation.
5.5 Metabolic Support Strategies
Energy metabolism-related agents such as thioctic acid and creatine can be used to evaluate the effects of mitochondrial substrate utilization, phosphagen buffering, and ATP maintenance on NECSO. If metabolic support delays ATP decline, lactate dehydrogenase release, and plasma membrane rupture without eliminating early Na⁺ influx, its primary action is likely directed toward the downstream metabolic execution stage rather than direct TRPM4 blockade.
6 Experimental Detection and Identification of NECSO
6.1 Intracellular Na⁺ Detection
ICP-MS can quantitatively measure intracellular elements such as Na, K, Ca, Mg, and Fe and is an important method for confirming sodium overload. Sodium-sensitive fluorescent probes can be used for time-series analysis in living cells to determine the temporal relationships among Na⁺ elevation, membrane depolarization, ATP decline, and cell death. Measurements must be normalized to cell number and cell volume, and residual culture medium must be removed to avoid misinterpreting extracellular Na⁺ contamination as intracellular accumulation.
6.2 Na⁺-Free Substitution Experiments
NaCl in an isotonic buffer can be replaced with an N-methyl-D-glucamine salt that does not readily cross the membrane, reducing extracellular Na⁺ while maintaining osmotic pressure. If Na⁺-free conditions markedly inhibit NC1-induced cellular swelling, ATP decline, and plasma membrane rupture, whereas simply increasing extracellular K⁺ does not provide the same protection, the results support Na⁺ influx as a necessary event in cell death.
6.3 Verification of TRPM4 Dependence
TRPM4 knockout, knockdown, or channel-inactivating mutations should reduce NC1-induced currents, Na⁺ accumulation, and cell death. Re-expression of functional human TRPM4 in deficient cells should restore sensitivity. Pharmacological inhibition can provide supporting evidence but should be combined with genetic intervention, patch-clamp recording, and ion measurements.
6.4 Detection of Membrane Potential and Channel Currents
Whole-cell patch-clamp recording can directly measure NC1-induced TRPM4-dependent currents and assess dose responses, activation kinetics, and inhibitor effects. Membrane-potential probes such as DiBAC4(3) can be used to monitor membrane depolarization. However, probe signals are susceptible to changes in cell volume, membrane permeability, and compound autofluorescence, requiring ionophore-positive controls and cell-free interference controls.
6.5 Plasma Membrane Integrity and Cell-Death Kinetics
Entry of membrane-impermeable nucleic acid dyes such as PI indicates loss of plasma membrane integrity. Increased lactate dehydrogenase activity in the culture supernatant reflects leakage of cytosolic components, whereas live-cell imaging can record the temporal progression of cellular swelling and membrane rupture. ATP decline generally precedes PI positivity and lactate dehydrogenase release. Measurements at multiple time points help distinguish early metabolic abnormalities from terminal membrane damage.
6.6 Mitochondrial Function Assays
TMRE can be used to measure mitochondrial membrane potential, whereas extracellular flux analysis can assess basal respiration, maximal respiration, and ATP-linked oxygen consumption. When experimental conditions permit, mitochondrial Na⁺ and Ca²⁺ measurements, respiratory-chain complex activity assays, tricarboxylic acid cycle metabolomics, and transmission electron microscopy can be combined to characterize mitochondrial damage at ionic, functional, and structural levels.
6.7 Transmission Electron Microscopy
Early NECSO may involve mitochondrial swelling and abnormal cristae structure, followed by progressive expansion of the endoplasmic reticulum, Golgi apparatus, and nuclear envelope. Plasma membrane rupture occurs at the terminal stage. Transmission electron microscopy is suitable for confirming organelle edema and necrotic morphology, but morphological findings alone cannot establish NECSO and must be combined with evidence of TRPM4 and Na⁺ dependence.
6.8 Exclusion of Other Cell-Death Pathways
Caspase inhibitors, RIPK1 inhibitors, ferroptosis inhibitors, iron chelators, autophagy inhibitors, and inflammatory caspase inhibitors can be added separately to assess the contributions of established cell-death pathways. Inhibitor concentration, pretreatment duration, and target-inhibition efficacy must be validated in advance. A negative rescue result can only support pathway exclusion when the pharmacological treatment has been confirmed to be effective.
7 Products Related to NECSO
Catalog # | Product Name | Grade & Purity | Mechanism of Action and Research Positioning |
Clotrimazole | Moligand™, ≥98%(HPLC) | Competitively occupies the NC1-associated binding pocket within the TRPM4 transmembrane region, reducing sustained channel opening, Na⁺ influx, and membrane depolarization; used for NECSO blockade and binding-site validation | |
Cilnidipine (FRC-8653) | Moligand™, 10mM in DMSO | Blocks voltage-dependent Ca²⁺ channels and restricts the upstream Ca²⁺ influx required to maintain sustained TRPM4 activation | |
Lacidipine | Moligand™, 10mM in DMSO | Inhibits L-type voltage-dependent Ca²⁺ channels to evaluate the contribution of LTCC–Ca²⁺–TRPM4 coupling to NECSO | |
Lercanidipine | 10mM in DMSO | Inhibits L-type Ca²⁺ channel-mediated Ca²⁺ influx and is used to evaluate the regulation of NECSO by upstream Ca²⁺ signaling | |
Glyburide | Moligand™, ≥99% | Can inhibit TRPM4-mediated monovalent cation currents while also acting on ATP-sensitive K⁺ channels; used as an auxiliary pharmacological control for TRPM4 | |
9-Phenanthrol | Moligand™, 10mM in DMSO | Inhibits TRPM4 channel currents and is used to evaluate changes in Na⁺ accumulation, membrane depolarization, and cell death following channel blockade | |
N-Methyl-D-glucamine Hydrochloride [for Buffer] | ≥98%(HPLC)(T) | Serves as a poorly membrane-permeable organic cation for isotonic replacement of extracellular Na⁺, allowing the establishment of Na⁺-free buffer conditions and verification of the Na⁺ dependence of cell death | |
BAPTA-AM | 10mM in DMSO | Forms a Ca²⁺ chelator after entering cells and reduces cytosolic free Ca²⁺, allowing the dependence of TRPM4 activation and NECSO on Ca²⁺ signaling to be assessed | |
2-Deoxy-D-glucose (2-DG) | 10mM in DMSO | Inhibits glycolysis and reduces ATP production and is used to establish an energy-depletion model and investigate TRPM4-associated injury induced by ATP deficiency | |
DL-Thioctic acid | ≥99% | Participates in mitochondrial dehydrogenase-complex reactions and regulates redox homeostasis; used to evaluate whether mitochondrial metabolic support can delay NECSO | |
Creatine, anhydrous | Moligand™, ≥98% | Participates in the creatine–phosphocreatine energy-buffering system and supports rapid ATP regeneration; used to investigate the protective effects of energy reserves against NECSO | |
Z-VAD-FMK | Moligand™, 10mM in DMSO | Irreversibly inhibits multiple caspases and is used to determine whether NC1-induced death depends on caspase-mediated apoptosis | |
Necrostatin-1 | Moligand™, 10mM in DMSO | Inhibits RIPK1 kinase activity and is used to exclude classical RIPK1–RIPK3–MLKL-mediated necroptosis | |
Ferrostatin-1 (Fer-1) | 10mM in DMSO | Traps lipid radicals and terminates membrane phospholipid peroxidation chain reactions and is used to exclude ferroptosis | |
Liproxstatin-1 | 10mM in DMSO | Inhibits the amplification of iron-dependent lipid peroxidation and is used to distinguish NECSO from lipid peroxidation-driven ferroptosis | |
Deferoxamine | Moligand™, ≥98% | Chelates free iron and reduces the cellular labile iron pool and is used to determine whether cell death depends on iron accumulation and iron-catalyzed oxidation | |
Chloroquine | Moligand™, 10mM in DMSO | Inhibits lysosomal acidification and autophagic substrate degradation and is used to determine whether autophagic flux participates in NC1-induced cell death | |
3-Methyladenine | 10mM in DMSO | Regulates PI3K activity and inhibits autophagosome formation and is used to interfere with autophagy initiation and exclude autophagy-related cell death | |
Propidium iodide（PI） | ≥98%(HPLC) | Enters cells and binds nucleic acids after loss of plasma membrane integrity and is used to record late-stage membrane rupture and the proportion of dead cells during NECSO | |
DiBAC4(3) | Moligand™, 10 mM in DMSO | Enters cells and exhibits enhanced fluorescence during membrane depolarization and is used to dynamically monitor the decrease in plasma membrane potential caused by sustained TRPM4 opening | |
Fluo-4 AM | BioReagent, ≥90%(HPLC), 2mM | Exhibits increased fluorescence after binding cytosolic Ca²⁺ and is used to analyze Ca²⁺ changes after NC1 treatment and their temporal relationship with TRPM4 activation | |
TMRE [Tetramethylrhodamine, ethyl ester, perchlorate] | for Fluorescence analysis, ≥90%(HPCE) | Accumulates in mitochondria in a membrane potential-dependent manner and is used to detect mitochondrial depolarization and functional deterioration during sodium overload | |
Cell Counting Kit-8 | BioReagent, for detection | Measures cellular metabolic activity through the WST-8 reduction reaction and is used to compare cell viability under different inducers, inhibitors, and ionic conditions | |
Enhanced ATP Assay Kit | BioReagent | Quantifies cellular ATP through a luciferase reaction and is used to determine the temporal sequence among ATP decline, Na⁺ overload, and membrane rupture | |
LDH Cytotoxicity Assay Kit with WST-8 | BioReagent, Ready-to-use, for IP | Measures lactate dehydrogenase activity in culture supernatants and is used to quantify plasma membrane rupture and the extent of cell lysis |
NECSO is a Na⁺-dependent necrotic process driven by sustained TRPM4 activation. Its core events include Na⁺ overload, membrane depolarization, mitochondrial ionic imbalance, inhibition of oxidative phosphorylation, ATP depletion, and osmotic cell lysis. Experimental identification should simultaneously establish TRPM4 dependence, Na⁺ dependence, energy-metabolic collapse, and necrotic membrane rupture while excluding apoptosis, necroptosis, ferroptosis, and pyroptosis through pharmacological and genetic approaches.
References
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[2] Despa S, et al. Na⁺ transport in the normal and failing heart—remember the balance. J Mol Cell Cardiol. 2013;61:2–10.
[3] Aksentijevic D, et al. Is there a causal link between intracellular Na⁺ elevation and metabolic remodelling in cardiac hypertrophy? Biochem Soc Trans. 2018;46(4):817–827.
[4] Fu W, et al. Persistent activation of TRPM4 triggers necrotic cell death characterized by sodium overload. Nat Chem Biol. 2025;21(8):1238–1249.
[5] Qiao Y, Wang J, Wang B, et al. Sodium disrupts mitochondrial energy metabolism to execute NECSO. Nat Commun. 2026;17:493.
[6] Teixeira-Duarte CM, Fu W, Zeng W, et al. Structural mechanism of Necrocide 1 activation of human TRPM4 that triggers necrosis by sodium overload. Nat Commun. 2026;17(1):7939.
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