Page last updated: 2024-10-24
intracellular sodium ion homeostasis
Definition
Target type: biologicalprocess
A homeostatic process involved in the maintenance of a steady state level of sodium ions within a cell. [GOC:ai, GOC:mah]
Intracellular sodium ion homeostasis is a fundamental biological process that ensures the proper balance of sodium ions (Na+) within cells. It plays a crucial role in various cellular functions, including membrane potential, cell volume regulation, and signaling pathways.
The maintenance of sodium ion homeostasis involves a complex interplay of several mechanisms, including active transport by sodium-potassium pumps (Na+/K+ ATPases), passive diffusion through ion channels, and the action of sodium-coupled transporters.
**Active Transport:**
- **Na+/K+ ATPases** are primary active transporters that pump sodium ions out of the cell and potassium ions into the cell, against their respective concentration gradients. This process consumes energy derived from ATP hydrolysis, creating a sodium concentration gradient across the cell membrane.
**Passive Diffusion:**
- **Sodium channels** allow the passive diffusion of sodium ions down their electrochemical gradient, from high concentration to low concentration. These channels can be voltage-gated, ligand-gated, or mechanically gated, depending on the specific type.
**Sodium-Coupled Transporters:**
- **Sodium-glucose cotransporters (SGLTs)** utilize the electrochemical gradient of sodium ions to drive the transport of glucose into the cell. This process is crucial for glucose uptake in the intestines and kidneys.
- **Sodium-calcium exchangers (NCXs)** exchange sodium ions for calcium ions across the cell membrane. This mechanism contributes to calcium homeostasis and muscle contraction.
**Regulation of Sodium Ion Homeostasis:**
- **Hormones:** Aldosterone, a steroid hormone, increases sodium reabsorption in the kidneys, contributing to sodium ion homeostasis in the body.
- **Nervous system:** The nervous system regulates sodium ion homeostasis by controlling the activity of sodium channels and transporters in various tissues.
**Consequences of Dysregulation:**
- **Hypernatremia:** Elevated intracellular sodium levels can lead to cell dehydration, osmotic stress, and potential cell damage.
- **Hyponatremia:** Reduced intracellular sodium levels can disrupt membrane potential, impair nerve and muscle function, and lead to various neurological complications.
In summary, intracellular sodium ion homeostasis is a vital process that involves a complex interplay of active and passive transport mechanisms. The precise regulation of sodium ion levels is essential for maintaining normal cellular function and overall physiological health.'
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Proteins (15)
| Protein | Definition | Taxonomy |
|---|---|---|
| Potassium-transporting ATPase subunit beta | A potassium-transporting ATPase subunit beta that is encoded in the genome of human. [PRO:DNx, UniProtKB:P51164] | Homo sapiens (human) |
| Potassium-transporting ATPase alpha chain 2 | A potassium-transporting ATPase alpha chain 2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P54707] | Homo sapiens (human) |
| Sodium/potassium-transporting ATPase subunit alpha-4 | A sodium/potassium-transporting ATPase subunit alpha-4 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q13733] | Homo sapiens (human) |
| Potassium-transporting ATPase alpha chain 1 | A potassium-transporting ATPase alpha chain 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P20648] | Homo sapiens (human) |
| Solute carrier family 12 member 2 | A solute carrier family 12 member 2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P55011] | Homo sapiens (human) |
| Sodium/potassium-transporting ATPase subunit gamma | A sodium/potassium-transporting ATPase subunit gamma that is encoded in the genome of human. [PRO:DNx, UniProtKB:P54710] | Homo sapiens (human) |
| Sodium/potassium-transporting ATPase subunit beta-3 | A sodium/potassium-transporting ATPase subunit beta-3 that is encoded in the genome of human. [PRO:WCB, UniProtKB:P54709] | Homo sapiens (human) |
| Sodium/potassium-transporting ATPase subunit alpha-2 | A sodium/potassium-transporting ATPase subunit alpha-2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P50993] | Homo sapiens (human) |
| Excitatory amino acid transporter 1 | An excitatory amino acid transporter 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P43003] | Homo sapiens (human) |
| Amiloride-sensitive sodium channel subunit alpha | An amiloride-sensitive sodium channel subunit alpha that is encoded in the genome of human. [PRO:DNx, UniProtKB:P37088] | Homo sapiens (human) |
| Sodium/hydrogen exchanger 1 | A sodium/hydrogen exchanger 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P19634] | Homo sapiens (human) |
| Sodium/potassium-transporting ATPase subunit beta-2 | A sodium/potassium-transporting ATPase subunit beta-2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P14415] | Homo sapiens (human) |
| Sodium/potassium-transporting ATPase subunit alpha-3 | A sodium/potassium-transporting ATPase subunit alpha-3 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P13637] | Homo sapiens (human) |
| Sodium/potassium-transporting ATPase subunit beta-1 | A sodium/potassium-transporting ATPase subunit beta-1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P05026] | Homo sapiens (human) |
| Sodium/potassium-transporting ATPase subunit alpha-1 | A sodium/potassium-transporting ATPase subunit alpha-1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P05023] | Homo sapiens (human) |
Compounds (46)
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid | alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid: An IBOTENIC ACID homolog and glutamate agonist. The compound is the defining agonist for the AMPA subtype of glutamate receptors (RECEPTORS, AMPA). It has been used as a radionuclide imaging agent but is more commonly used as an experimental tool in cell biological studies. | non-proteinogenic alpha-amino acid | |
| ethylisopropylamiloride | ethylisopropylamiloride : A member of the class of pyrazines that is amiloride in which the amino substitutent of the pyrazine ring that is adjacent to the chloro substituent has been substituted by an ethyl group and by an isopropyl group. ethylisopropylamiloride: structure in first source | aromatic amine; guanidines; monocarboxylic acid amide; organochlorine compound; pyrazines; tertiary amino compound | anti-arrhythmia drug; neuroprotective agent; sodium channel blocker |
| bumetanide | amino acid; benzoic acids; sulfonamide | diuretic; EC 3.6.3.49 (channel-conductance-controlling ATPase) inhibitor | |
| cimetidine | cimetidine : A member of the class of guanidines that consists of guanidine carrying a methyl substituent at position 1, a cyano group at position 2 and a 2-{[(5-methyl-1H-imidazol-4-yl)methyl]sulfanyl}ethyl group at position 3. It is a H2-receptor antagonist that inhibits the production of acid in stomach. Cimetidine: A histamine congener, it competitively inhibits HISTAMINE binding to HISTAMINE H2 RECEPTORS. Cimetidine has a range of pharmacological actions. It inhibits GASTRIC ACID secretion, as well as PEPSIN and GASTRIN output. | aliphatic sulfide; guanidines; imidazoles; nitrile | adjuvant; analgesic; anti-ulcer drug; H2-receptor antagonist; P450 inhibitor |
| lansoprazole | Lansoprazole: A 2,2,2-trifluoroethoxypyridyl derivative of timoprazole that is used in the therapy of STOMACH ULCERS and ZOLLINGER-ELLISON SYNDROME. The drug inhibits H(+)-K(+)-EXCHANGING ATPASE which is found in GASTRIC PARIETAL CELLS. Lansoprazole is a racemic mixture of (R)- and (S)-isomers. | benzimidazoles; pyridines; sulfoxide | anti-ulcer drug; EC 3.6.3.10 (H(+)/K(+)-exchanging ATPase) inhibitor |
| omeprazole | 5-methoxy-2-{[(4-methoxy-3,5-dimethylpyridin-2-yl)methyl]sulfinyl}-1H-benzimidazole : A member of the class of benzimidazoles that is 1H-benzimidazole which is substituted by a [4-methoxy-3,5-dimethylpyridin-2-yl)methyl]sulfinyl group at position 2 and a methoxy group at position 5. omeprazole : A racemate comprising equimolar amounts of (R)- and (S)-omeprazole. Omeprazole: A 4-methoxy-3,5-dimethylpyridyl, 5-methoxybenzimidazole derivative of timoprazole that is used in the therapy of STOMACH ULCERS and ZOLLINGER-ELLISON SYNDROME. The drug inhibits an H(+)-K(+)-EXCHANGING ATPASE which is found in GASTRIC PARIETAL CELLS. | aromatic ether; benzimidazoles; pyridines; sulfoxide | |
| pantoprazole | pantoprazole : A member of the class of benzimidazoles that is 1H-benzimidazole substituted by a difluoromethoxy group at position 5 and a [(3,4-dimethoxypyridin-2-yl)methyl]sulfinyl group at position 2. Pantoprazole: 2-pyridinylmethylsulfinylbenzimidazole proton pump inhibitor that is used in the treatment of GASTROESOPHAGEAL REFLUX and PEPTIC ULCER. | aromatic ether; benzimidazoles; organofluorine compound; pyridines; sulfoxide | anti-ulcer drug; EC 3.6.3.10 (H(+)/K(+)-exchanging ATPase) inhibitor; environmental contaminant; xenobiotic |
| ranitidine | aralkylamine | ||
| cysteine | cysteine; cysteine zwitterion; L-alpha-amino acid; proteinogenic amino acid; serine family amino acid | EC 4.3.1.3 (histidine ammonia-lyase) inhibitor; flour treatment agent; human metabolite | |
| aspartic acid | aspartic acid : An alpha-amino acid that consists of succinic acid bearing a single alpha-amino substituent Aspartic Acid: One of the non-essential amino acids commonly occurring in the L-form. It is found in animals and plants, especially in sugar cane and sugar beets. It may be a neurotransmitter. L-aspartic acid : The L-enantiomer of aspartic acid. | aspartate family amino acid; aspartic acid; L-alpha-amino acid; proteinogenic amino acid | Escherichia coli metabolite; mouse metabolite; neurotransmitter |
| benzotriazole | benzotriazole : The simplest member of the class of benzotriazoles that consists of a benzene nucleus fused to a 1H-1,2,3-triazole ring. benzotriazole: inhibitor of atmospheric metal corrosion; also component of motion picture film & Neva brake fluid | benzotriazoles | environmental contaminant; xenobiotic |
| digoxigenin | digoxigenin : A hydroxy steroid that consists of 5beta-cardanolide having a double bond at the 20(22)-position as well as hydroxy groups at the 3beta-, 12beta- and 14beta-positions. It has been isolated from the plant species of the genus Digitalis. Digoxigenin: 3 beta,12 beta,14-Trihydroxy-5 beta-card-20(22)-enolide. A cardenolide which is the aglycon of digoxin. Can be obtained by hydrolysis of digoxin or from Digitalis orientalis L. and Digitalis lanata Ehrh. | 12beta-hydroxy steroid; 14beta-hydroxy steroid; 3beta-hydroxy steroid; 3beta-sterol | hapten; plant metabolite |
| amiloride | amiloride : A member of the class of pyrazines resulting from the formal monoacylation of guanidine with the carboxy group of 3,5-diamino-6-chloropyrazine-2-carboxylic acid. Amiloride: A pyrazine compound inhibiting SODIUM reabsorption through SODIUM CHANNELS in renal EPITHELIAL CELLS. This inhibition creates a negative potential in the luminal membranes of principal cells, located in the distal convoluted tubule and collecting duct. Negative potential reduces secretion of potassium and hydrogen ions. Amiloride is used in conjunction with DIURETICS to spare POTASSIUM loss. (From Gilman et al., Goodman and Gilman's The Pharmacological Basis of Therapeutics, 9th ed, p705) | aromatic amine; guanidines; organochlorine compound; pyrazines | diuretic; sodium channel blocker |
| d-glutamate | D-alpha-amino acid; glutamic acid | Escherichia coli metabolite; mouse metabolite | |
| glutamic acid | glutamic acid : An alpha-amino acid that is glutaric acid bearing a single amino substituent at position 2. Glutamic Acid: A non-essential amino acid naturally occurring in the L-form. Glutamic acid is the most common excitatory neurotransmitter in the CENTRAL NERVOUS SYSTEM. | glutamic acid; glutamine family amino acid; L-alpha-amino acid; proteinogenic amino acid | Escherichia coli metabolite; ferroptosis inducer; micronutrient; mouse metabolite; neurotransmitter; nutraceutical |
| amiloride hydrochloride | amiloride hydrochloride dihydrate : A hydrate that is the dihydrate of amiloride hydrochloride. | hydrate | diuretic; sodium channel blocker |
| timoprazole | timoprazole: gastric acid secretion inhibitor | ||
| d-aspartic acid | aspartic acid; D-alpha-amino acid | mouse metabolite | |
| digoxigenin-bis(digitoxoside) | cardenolide glycoside | ||
| sym 2081 | |||
| dihydrokainate | dicarboxylic acid | ||
| benzamil | guanidines; pyrazines | ||
| 2-((2-dimethylaminobenzyl)sulfinyl)benzimidazole | 2-((2-dimethylaminobenzyl)sulfinyl)benzimidazole: structure given in first source | ||
| cariporide | cariporide: a selective sodium-hydrogen exchange subtype 1 inhibitor; structure in first source | ||
| rostafuroxin | rostafuroxin: structure in first source | ||
| serine o-sulfate | L-serine O-sulfate : A non-proteinogenic L-alpha-amino acid that is the O-sulfo derivative of L-serine. serine O-sulfate: RN given refers to (L)-isomer | L-serine derivative; non-proteinogenic L-alpha-amino acid; O-sulfoamino acid | |
| ouabain | cardiac glycoside : Steroid lactones containing sugar residues that act on the contractile force of the cardiac muscles. ouabain : A steroid hormone that is a multi-hydroxylated alpha-L-rhamnosyl cardenoloide. It binds to and inhibits the plasma membrane Na(+)/K(+)-ATPase (sodium pump). It has been isolated naturally from Strophanthus gratus. Ouabain: A cardioactive glycoside consisting of rhamnose and ouabagenin, obtained from the seeds of Strophanthus gratus and other plants of the Apocynaceae; used like DIGITALIS. It is commonly used in cell biological studies as an inhibitor of the NA(+)-K(+)-EXCHANGING ATPASE. | 11alpha-hydroxy steroid; 14beta-hydroxy steroid; 5beta-hydroxy steroid; alpha-L-rhamnoside; cardenolide glycoside; steroid hormone | anti-arrhythmia drug; cardiotonic drug; EC 2.3.3.1 [citrate (Si)-synthase] inhibitor; EC 3.1.3.41 (4-nitrophenylphosphatase) inhibitor; EC 3.6.3.10 (H(+)/K(+)-exchanging ATPase) inhibitor; EC 3.6.3.9 (Na(+)/K(+)-transporting ATPase) inhibitor; ion transport inhibitor; plant metabolite |
| digitoxin | digitoxin : A cardenolide glycoside in which the 3beta-hydroxy group of digitoxigenin carries a 2,6-dideoxy-beta-D-ribo-hexopyranosyl-(1->4)-2,6-dideoxy-beta-D-ribo-hexopyranosyl-(1->4)-2,6-dideoxy-beta-D-ribo-hexopyranosyl trisaccharide chain. Digitoxin: A cardiac glycoside sometimes used in place of DIGOXIN. It has a longer half-life than digoxin; toxic effects, which are similar to those of digoxin, are longer lasting. (From Martindale, The Extra Pharmacopoeia, 30th ed, p665) | cardenolide glycoside | EC 3.6.3.9 (Na(+)/K(+)-transporting ATPase) inhibitor |
| hinokinin | hinokinin : A lignan that is dihydrofuran-2(3H)-one (gamma-butyrolactone) substituted by a 3,4-methylenedioxybenzyl group at positions 3 and 4 (the 3R,4R-diastereoisomer). hinokinin: suppresses expression of both HBsAg and HBeAg | benzodioxoles; gamma-lactone; lignan | trypanocidal drug |
| 3-hydroxyaspartic acid, (threo-l)-isomer | (3S)-3-hydroxy-L-aspartic acid : The (3S)-diastereomer of 3-hydroxy-L-aspartic acid. | 3-hydroxy-L-aspartic acid | metabolite |
| digoxin | digoxin : A cardenolide glycoside that is digitoxin beta-hydroxylated at C-12. A cardiac glycoside extracted from the foxglove plant, Digitalis lanata, it is used to control ventricular rate in atrial fibrillation and in the management of congestive heart failure with atrial fibrillation, but the margin between toxic and therapeutic doses is small. Digoxin: A cardiotonic glycoside obtained mainly from Digitalis lanata; it consists of three sugars and the aglycone DIGOXIGENIN. Digoxin has positive inotropic and negative chronotropic activity. It is used to control ventricular rate in ATRIAL FIBRILLATION and in the management of congestive heart failure with atrial fibrillation. Its use in congestive heart failure and sinus rhythm is less certain. The margin between toxic and therapeutic doses is small. (From Martindale, The Extra Pharmacopoeia, 30th ed, p666) | cardenolide glycoside; steroid saponin | anti-arrhythmia drug; cardiotonic drug; EC 3.6.3.9 (Na(+)/K(+)-transporting ATPase) inhibitor; epitope |
| 2-amino-3-phenylmethoxybutanedioic acid | aspartic acid derivative | ||
| digitoxigenin | digitoxigenin : A 5beta-cardenolide that is 5beta-cardanolide with hydroxy substituents at the 3beta- and 14beta-positions and double bond unsaturation at C(20)-C(22). Digitoxigenin: 3 beta,14-Dihydroxy-5 beta-card-20(22)enolide. A cardenolide which is the aglycon of digitoxin. Synonyms: Cerberigenin; Echujetin; Evonogenin; Thevetigenin. | 14beta-hydroxy steroid; 3beta-hydroxy steroid | |
| dl-threo-beta-benzyloxyaspartate | |||
| eniporide | eniporide: inhibits NHE-1 isoform; structure in first source | ||
| zoniporide | zoniporide: inhibits sodium-hydrogen exchanger isoform-1 (NHE-1) | ||
| n-(4-methylthiazol-2-yl)-2-(6-phenylpyridazin-3-ylthio)acetamide | N-(4-methylthiazol-2-yl)-2-(6-phenylpyridazin-3-ylthio)acetamide: a KCC2 cotransporter antagonist | pyridazines; ring assembly | |
| sabiporide | sabiporide: a NHE-1 inhibitor and a cardioprotective agent; structure in first source | ||
| phakellistatin 2 | phakellistatin 2: isolated from the marine sponge Phakellia carteri; structure in first source | ||
| (5-(2-methoxy-5-chloro-5-phenyl)furan-2-ylcarbonyl)guanidine | (5-(2-methoxy-5-chloro-5-phenyl)furan-2-ylcarbonyl)guanidine: KR-32570 possesses potent cardioprotective effects in perfused rat hearts, and its effects may be mediated by inhibition of NHE-1, preservation of high-energy phosphates, and inhibition of lipid peroxidation | ||
| l-beta-threo-benzyl-aspartate | L-beta-threo-benzyl-aspartate: structure in first source | ||
| digitoxigenin monodigitoxoside | digitoxigenin monodigitoxoside: RN given refers to (ribo-3beta,5beta)-isomer | ||
| evomonoside | evomonoside : A cardenolide glycoside consisting of digitoxigenin having an alpha-L-rhamnosyl moiety attached at the O(3)-position. evomonoside: a cytotoxic cardiac glycoside from Lepidium apetalum; RN refers to (3beta,5beta)-isomer | cardenolide glycoside | |
| halisulfate 1 | halisulfate 1: an isocitrate lyase inhibitor sesterterpene sulfate from sponge, Hippospongia sp.; structure in first source | organic molecular entity | metabolite |
| ucph 101 | 2-amino-4-(4-methoxyphenyl)-7-(naphthalen-1-yl)-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile: structure in first source | ||
| phenylamil | phenylamil: irreversible inhibitor of sodium channels in the toad urinary bladder | guanidines; pyrazines |