Reaction Process: WikiPathways:WP4545
Oxysterols derived from cholesterol related metabolites
find 23 related metabolites which is associated with chemical reaction(pathway) Oxysterols derived from cholesterol
(25R)26-HC ⟶ 3 -HCA
Cholic acid
Cholic acid is a bile acid that is 5beta-cholan-24-oic acid bearing three alpha-hydroxy substituents at position 3, 7 and 12. It has a role as a human metabolite and a mouse metabolite. It is a bile acid, a C24-steroid, a 3alpha-hydroxy steroid, a 7alpha-hydroxy steroid, a 12alpha-hydroxy steroid and a trihydroxy-5beta-cholanic acid. It is a conjugate acid of a cholate. Cholic acid is a metabolite found in or produced by Escherichia coli (strain K12, MG1655). Cholic acid is a Bile Acid. Cholic acid is a naturally occurring bile acid that is used to treat patients with genetic deficiencies in the synthesis of bile acids. When given in high doses, cholic acid replacement therapy has been linked to minor elevations in serum aminotransferase levels, but it has not been linked to instances of clinically apparent acute liver injury with jaundice. Cholic acid is a natural product found in Caenorhabditis elegans, Bufo bufo, and Homo sapiens with data available. Cholic acid is a major primary bile acid produced in the liver and usually conjugated with glycine or taurine. It facilitates fat absorption and cholesterol excretion. Bile acids are steroid acids found predominantly in bile of mammals. The distinction between different bile acids is minute, depends only on presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic molecules derived from the catabolism of cholesterol. They modulate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regulation of all the key enzymes involved in cholesterol homeostasis. Bile acids recirculate through the liver, bile ducts, small intestine and portal vein to form an enterohepatic circuit. They exist as anions at physiological pH and, consequently, require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g., membrane disruption) and there are a plethora of mechanisms to limit their accumulation in blood and tissues. (A3407, A3408, A3409, A3410). A major primary bile acid produced in the liver and usually conjugated with glycine or taurine. It facilitates fat absorption and cholesterol excretion. See also: Cholic acid; ferrous gluconate; honey (component of). Cholic acid is a major primary bile acid produced in the liver and is usually conjugated with glycine or taurine. It facilitates fat absorption and cholesterol excretion. Bile acids are steroid acids found predominantly in the bile of mammals. The distinction between different bile acids is minute, and depends only on the presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic molecules derived from the catabolism of cholesterol. They modulate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regulation of all the key enzymes involved in cholesterol homeostasis. Bile acids recirculate through the liver, bile ducts, small intestine, and portal vein to form an enterohepatic circuit. They exist as anions at physiological pH, and consequently require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g. membrane disruption) and there are a plethora of mechanisms to limit their accumulation in blood and tissues (PMID: 11316487, 16037564, 12576301, 11907135). When present in sufficiently high levels, cholic acid can act as a hepatotoxin and a metabotoxin. A hepatotoxin causes damage to the liver or liver cells. A metabotoxin is an endogenously produced metabolite that causes adverse health effects at chronically high levels. Among the primary bile acids, cholic acid is considered to be the least hepatotoxic while deoxycholic acid is the most hepatoxic (PMID: 1641875). The liver toxicity of bile acids appears to be due to their ability to peroxidate lipids and to lyse liver cells. Chronically high levels of cholic acid are associated with familial hypercholanemia. In hypercholanemia, bile acids, including cholic acid, are elevated in the blood. This disease causes liver damage, extensive itching, poor fat absorption, and can lead to rickets due to lack of calcium in bones. The deficiency of normal bile acids in the intestines results in a deficiency of vitamin K, which also adversely affects clotting of the blood. The bile acid ursodiol (ursodeoxycholic acid) can improve symptoms associated with familial hypercholanemia. Cholic acid. CAS Common Chemistry. CAS, a division of the American Chemical Society, n.d. https://commonchemistry.cas.org/detail?cas_rn=81-25-4 (retrieved 2024-06-29) (CAS RN: 81-25-4). Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0). Cholic acid is a major primary bile acid produced in the liver and usually conjugated with glycine or taurine. It facilitates fat absorption and cholesterol excretion. Cholic acid is orally active[1][2]. Cholic acid is a major primary bile acid produced in the liver and usually conjugated with glycine or taurine. It facilitates fat absorption and cholesterol excretion. Cholic acid is orally active[1][2].
7alpha-Hydroxycholesterol
7alpha-Hydroxycholesterol is an oxysterol and can serve as a biomarker for lipid peroxidation (PMID: 17386651). Products of cholesterol oxidation accumulate within atherosclerotic plaque and have been proposed to contribute to inflammatory signalling in the diseased artery (PMID: 17364953). 7alpha-Hydroxycholesterol is a cholesterol oxide that has been described as a biomarker of oxidative stress in subjects with impaired glucose tolerance and diabetes (PMID: 16634125). 7alpha-Hydroxycholesterol has been identified in the human placenta (PMID: 32033212). 7alpha-hydroxycholesterol is an oxysterol and can serve as a biomarker for lipid peroxidation. (PMID: 17386651) Products of cholesterol oxidation accumulate within atherosclerotic plaque and have been proposed to contribute to inflammatory signalling in the diseased artery. (PMID: 17364953) 7α-Hydroxycholesterol is a cholesterol oxide and is formed by both enzymatic and non-enzymatic oxidation. 7α-Hydroxycholesterol can be used as a biomarker for lipid peroxidation[1][2].
Cholesterol
Cholesterol is a sterol (a combination steroid and alcohol) and a lipid found in the cell membranes of all body tissues and transported in the blood plasma of all animals. The name originates from the Greek chole- (bile) and stereos (solid), and the chemical suffix -ol for an alcohol. This is because researchers first identified cholesterol in solid form in gallstones in 1784. In the body, cholesterol can exist in either the free form or as an ester with a single fatty acid (of 10-20 carbons in length) covalently attached to the hydroxyl group at position 3 of the cholesterol ring. Due to the mechanism of synthesis, plasma cholesterol esters tend to contain relatively high proportions of polyunsaturated fatty acids. Most of the cholesterol consumed as a dietary lipid exists as cholesterol esters. Cholesterol esters have a lower solubility in water than cholesterol and are more hydrophobic. They are hydrolyzed by the pancreatic enzyme cholesterol esterase to produce cholesterol and free fatty acids. Cholesterol has vital structural roles in membranes and in lipid metabolism in general. It is a biosynthetic precursor of bile acids, vitamin D, and steroid hormones (glucocorticoids, estrogens, progesterones, androgens and aldosterone). In addition, it contributes to the development and functioning of the central nervous system, and it has major functions in signal transduction and sperm development. Cholesterol is a ubiquitous component of all animal tissues where much of it is located in the membranes, although it is not evenly distributed. The highest proportion of unesterified cholesterol is in the plasma membrane (roughly 30-50\\\\% of the lipid in the membrane or 60-80\\\\% of the cholesterol in the cell), while mitochondria and the endoplasmic reticulum have very low cholesterol contents. Cholesterol is also enriched in early and recycling endosomes, but not in late endosomes. The brain contains more cholesterol than any other organ where it comprises roughly a quarter of the total free cholesterol in the human body. Of all the organic constituents of blood, only glucose is present in a higher molar concentration than cholesterol. Cholesterol esters appear to be the preferred form for transport in plasma and as a biologically inert storage (de-toxified) form. They do not contribute to membranes but are packed into intracellular lipid particles. Cholesterol molecules (i.e. cholesterol esters) are transported throughout the body via lipoprotein particles. The largest lipoproteins, which primarily transport fats from the intestinal mucosa to the liver, are called chylomicrons. They carry mostly triglyceride fats and cholesterol that are from food, especially internal cholesterol secreted by the liver into the bile. In the liver, chylomicron particles give up triglycerides and some cholesterol. They are then converted into low-density lipoprotein (LDL) particles, which carry triglycerides and cholesterol on to other body cells. In healthy individuals, the LDL particles are large and relatively few in number. In contrast, large numbers of small LDL particles are strongly associated with promoting atheromatous disease within the arteries. (Lack of information on LDL particle number and size is one of the major problems of conventional lipid tests.). In conditions with elevated concentrations of oxidized LDL particles, especially small LDL particles, cholesterol promotes atheroma plaque deposits in the walls of arteries, a condition known as atherosclerosis, which is a major contributor to coronary heart disease and other forms of cardiovascular disease. There is a worldwide trend to believe that lower total cholesterol levels tend to correlate with lower atherosclerosis event rates (though some studies refute this idea). As a result, cholesterol has become a very large focus for the scientific community trying to determine the proper amount of cholesterol needed in a healthy diet. However, the primary association of atherosclerosis with c... Constituent either free or as esters, of fish liver oils, lard, dairy fats, egg yolk and bran Cholesterol is the major sterol in mammals. It is making up 20-25\\% of structural component of the plasma membrane. Plasma membranes are highly permeable to water but relatively impermeable to ions and protons. Cholesterol plays an important role in determining the fluidity and permeability characteristics of the membrane as well as the function of both the transporters and signaling proteins[1][2]. Cholesterol is also an endogenous estrogen-related receptor α (ERRα) agonist[3]. Cholesterol is the major sterol in mammals. It is making up 20-25\% of structural component of the plasma membrane. Plasma membranes are highly permeable to water but relatively impermeable to ions and protons. Cholesterol plays an important role in determining the fluidity and permeability characteristics of the membrane as well as the function of both the transporters and signaling proteins[1][2]. Cholesterol is also an endogenous estrogen-related receptor α (ERRα) agonist[3].
7-Dehydrocholesterol
7-Dehydrocholesterol (7-DHC), also known as provitamin D3 or 5,7-cholestadien-3-b-ol, belongs to the class of organic compounds known as cholesterols and derivatives. Cholesterols and derivatives are compounds containing a 3-hydroxylated cholestane core. Thus, 7-dehydrocholesterol is also classified as a sterol. 7-Dehydrocholesterol is known as a zoosterol, meaning that it is a sterol isolated from animals (to distinguish those sterols isolated from plants which are called phytosterols). 7-DHC functions in the serum as a cholesterol precursor and is photochemically converted to vitamin D3 in the skin. Therefore 7-DHC functions as provitamin-D3. The presence of 7-DHC in human skin enables humans and other mammals to manufacture vitamin D3 (cholecalciferol) from ultraviolet rays in the sun light, via an intermediate isomer pre-vitamin D3. 7-DHC absorbs UV light most effectively at wavelengths between 290 and 320 nm and, thus, the production of vitamin D3 will occur primarily at those wavelengths (PMID: 9625080). The two most important factors that govern the generation of pre-vitamin D3 are the quantity (intensity) and quality (appropriate wavelength) of the UVB irradiation reaching the 7-dehydrocholesterol deep in the stratum basale and stratum spinosum (PMID: 9625080). 7-DHC is also found in the milk of several mammalian species, including cows (PMID: 10999630; PMID: 225459). It was discovered by Nobel-laureate organic chemist Adolf Windaus. 7-DHC can be produced by animals and plants via different pathways (PMID: 23717318). It is not produced by fungi in significant amounts. 7-DHC is made by some algae and can also be produced by some bacteria. 7-Dehydrocholesterol is a zoosterol (a sterol produced by animals rather than plants). It is a provitamin-D. The presence of this compound in skin enables humans to manufacture vitamin D3 from ultra-violet rays in the sun light, via an intermediate isomer provitamin D3. It is also found in breast milk. [HMDB] D018977 - Micronutrients > D014815 - Vitamins > D000072664 - Provitamins 7-Dehydrocholesterol is biosynthetic precursor of cholesterol and vitamin D3. 7-Dehydrocholesterol is biosynthetic precursor of cholesterol and vitamin D3.
5beta-Cholestane-3alpha,7alpha,12alpha-triol
5beta-Cholestane-3alpha,7alpha,12alpha-triol is an intermediate in bile acid biosynthesis. 5beta-Cholestane-3alpha,7alpha,12alpha-triol is the second to last step in the synthesis of 5beta-cyprinolsulfate. It is converted from 7alpha,12alpha-dihydroxy-5beta-cholestan-3-one via enzymatic reaction, and then it is converted into 3alpha,7alpha,12alpha,26-tetrahydroxy-5beta-cholestane via the enzyme cytochrome P450 (EC 1.14.13.15). This compound inhibits la-hydroxylation (PMID: 7937829). It is the byproduct of cholestanetetraol 26-dehydrogenase (EC 1.1.1.161) and the reaction that catalyzes it is classified as a small molecule reaction (BioCyc). 5-b-Cholestane-3a ,7a ,12a-triol is an intermediate in Bile acid biosynthesis. 5-b-Cholestane-3a ,7a ,12a-triol is the second to last step of synthesis of 5beta-Cyprinolsulfate. It is converted from 7alpha,12alpha-Dihydroxy-5beta-cholestan-3-one via enzymatic reaction then it is coneverted to 3alpha,7alpha,12alpha,26-Tetrahydroxy-5beta-cholestane via the enzyme cytochrome P450(EC.1.14.13.15). This compound inhibits la-Hydroxylation, (PMID: 7937829). It is the byproduct of Cholestanetetraol 26-dehydrogenase (EC 1.1.1.161), and the reaction that cataylzes it is classified as a small molecule reaction. (BioCyc) [HMDB]
7a-Hydroxy-cholestene-3-one
7a-Hydroxy-cholestene-3-one is a metabolite in bile acid synthesis. It is derived from 7a-hydroxy-cholesterol and can be further metabolized to 7a,12a,-dihydroxy-cholest-4-en-3-one. Analysis of 7a-Hydroxycholestene-3-one (HCO) in serum may serve as a novel, simple, and sensitive method for the detection of bile acid malabsorption in patients with chronic diarrhea of unknown origin (PMID 9952217) [HMDB] 7a-Hydroxy-cholestene-3-one is a metabolite in bile acid synthesis. It is derived from 7a-hydroxy-cholesterol and can be further metabolized to 7a,12a,-dihydroxy-cholest-4-en-3-one. Analysis of 7a-Hydroxycholestene-3-one (HCO) in serum may serve as a novel, simple, and sensitive method for the detection of bile acid malabsorption in patients with chronic diarrhea of unknown origin (PMID 9952217).
24-Hydroxycholesterol
24-Hydroxycholesterol (24OHC) is almost exclusively formed in the brain. The enzymatic conversion of CNS cholesterol to 24OHC, which readily crosses the blood-brain barrier, is the major pathway for brain cholesterol elimination and brain cholesterol homeostasis maintenance. The enzyme mediating this conversion has been characterized at the molecular level as cholesterol 24-hydroxylase (EC 1.14.13.98, CYP46) and is mainly located in neurons. Like other oxysterols, 24OHC is efficiently converted into normal bile acids or excreted in bile in its sulfated and glucuronidated form. Levels of 24OHC in the circulation decrease with age in infants and children. In adults, however, the levels appear to be stable. There is accumulating evidence pointing toward a potentially important link between cholesterol, beta-amyloid, and Alzheimers disease. Patients with active demyelinating diseases had increased levels of 24OHC in cerebrospinal fluid (CSF). Patients with Alzheimers disease have slightly increased levels of 24OHC in CSF. Patients with multiple sclerosis have a tendency to have higher levels of 24OHC during active periods. (PMID: 15061359, 14574622). 24-Hydroxycholesterol has been found to accumulate in hereditary hypercholesterolemia, an inborn error of metabolism. 24-Hydroxycholesterol (24OHC) is almost exclusively formed in the brain. The enzymatic conversion of CNS cholesterol to 24OHC, which readily crosses the blood-brain barrier, is the major pathway for brain cholesterol elimination and brain cholesterol homeostasis maintenance. The enzyme mediating this conversion has been characterized at the molecular level as cholesterol 24-hydroxylase (EC 1.14.13.98, CYP46) and is mainly located in neurons. Like other oxysterols, 24OHC is efficiently converted into normal bile acids or excreted in bile in its sulfated and glucuronidated form. Levels of 24OHC in the circulation decrease with age in infants and children. In adults, however, the levels appear to be stable. There is accumulating evidence pointing toward a potentially important link between cholesterol, beta-amyloid, and Alzheimers disease. Patients with active demyelinating diseases had increased levels of 24OHC in cerebrospinal fluid (CSF). Patients with Alzheimers disease have slightly increased levels of 24OHC in CSF. Patients with multiple sclerosis have a tendency to have higher levels of 24OHC during active periods. (PMID: 15061359, 14574622) [HMDB] 24(S)-Hydroxycholesterol (24S-OHC), the major brain cholesterol metabolite, plays an important role to maintain homeostasis of cholesterol in the brain. 24(S)-Hydroxycholesterol (24S-OHC) is one of the most efficient endogenous LXR agonist known and is present in the brain and in the circulation at relatively high levels. 24(S)-Hydroxycholesterol (24S-OHC) is a very potent, direct, and selective positive allosteric modulator of NMDARs with a mechanism that does not overlapthat of other allosteric modulators[1][2][3]. 24(S)-Hydroxycholesterol (24S-OHC), the major brain cholesterol metabolite, plays an important role to maintain homeostasis of cholesterol in the brain. 24(S)-Hydroxycholesterol (24S-OHC) is one of the most efficient endogenous LXR agonist known and is present in the brain and in the circulation at relatively high levels. 24(S)-Hydroxycholesterol (24S-OHC) is a very potent, direct, and selective positive allosteric modulator of NMDARs with a mechanism that does not overlapthat of other allosteric modulators[1][2][3].
(24S)-7alpha,24-Dihydroxycholesterol
This compound belongs to the family of Trihydroxy Bile Acids, Alcohols and Derivatives. These are prenol lipids structurally characterized by a bile acid or alcohol which bears three hydroxyl groups.
7a,12a-Dihydroxy-3-oxo-4-cholenoic acid
7a,12a-Dihydroxy-3-oxo-4-cholenoic acid is an unusual bile acids that have been detected in urine early in life, especially during the period up to 1 mo of age. This indicate that bile acid synthesis and metabolism in the liver of developing infants is significantly different from that occurring in the liver of adults. (PMID 10203155) [HMDB] 7a,12a-Dihydroxy-3-oxo-4-cholenoic acid is an unusual bile acids that have been detected in urine early in life, especially during the period up to 1 mo of age. This indicate that bile acid synthesis and metabolism in the liver of developing infants is significantly different from that occurring in the liver of adults. (PMID 10203155).
ST 27:2;O3
7alpha,25-Dihydroxy-4-cholesten-3-one
This compound belongs to the family of Cholesterols and Derivatives. These are compounds containing an hydroxylated chloestane moeity.
27-Hydroxycholesterol
27-Hydroxycholesterol (27-HC), also known as (25R)-cholest-5-ene-3β,26-diol or by its conventional name 26-hydroxycholesterol, is an oxygenated derivative of cholesterol and a major oxysterol in circulation (PMID: 7749852). 27-Hydroxycholesterol is the product of the enzyme sterol 27-hydroxylase. The enzyme is critical for the degradation of the steroid side-chain and a genetic deficiency of the enzyme leads to reduced formation of bile acids in humans. There is a correlation between 27-hydroxycholesterol and cholesterol in the circulation, and females have lower levels of 27-hydroxycholesterol than males. A strong correlation is observed between circulating levels of 27-hydroxycholesterol and cholesterol, in both healthy subjects and subjects with hypercholesterolemia and documented atherosclerosis. 27-Hydroxycholesterol is metabolized by an oxysterol 7alpha-hydroxylase in the liver. Changes in the activity of this enzyme may lead to the accumulation of 27-hydroxycholesterol in the circulation. It has been reported that patients with a genetic deficiency of oxysterol 7alpha-hydroxylase in the liver had markedly increased levels of 27-hydroxycholesterol in the circulation. However, under normal conditions and in the absence of liver or kidney disease, changes in the levels of 27-hydroxycholesterol in the circulation are likely to be caused by changes in the rate of synthesis of these steroids rather than by the rate of metabolism. There are three possible explanations for the high concentrations of 27-hydroxycholesterol found in the circulation of three subjects with atherosclerosis: (1) increased expression of sterol 27-hydroxylase owing to a genetic factor or some other factor completely unrelated to atherosclerosis, (2) the extrahepatic sterol 27-hydroxylase may be up-regulated by circulating factors (e.g. cytokines) that are directly or indirectly related to the development of atherosclerosis, and (3) the high amounts of cholesterol accumulating in macrophages in some patients with atherosclerosis may result in an increased flux of 27-hydroxycholesterol from the macrophages to the circulation. Since there is a close relation between levels of cholesterol and 27-hydroxycholesterol in the circulation, the possibility must be considered that the flux of 27-hydroxycholesterol into the brain may be part of the yet unexplained link between hypercholesterolemia and Alzheimers disease. 27-Hydroxysterol is the most dominant oxysterol in human atheromas where it may reflect a mechanism for eliminating excessive cholesterol, and thus have a protective role. Hypercholesterolemia and chronic low-grade immunological activation are pivotal in the development of atherosclerosis. However, the interconnections between these two factors are not well known. The CD40 system, as measured by the plasma level of soluble CD40 (sCD40), is associated with cholesterol metabolism in hypercholesterolemic patients. When combined, a decreased cholesterol synthesis rate and increased levels of 27-hydroxycholesterol may be a consequence of high levels of cellular cholesterol, and therefore be related to sCD40. However, sCD40 had no significant correlation with total plasma cholesterol. This suggests that the cellular cholesterol synthesis rate and 27-hydroxycholesterol production are more importantly linked with the plasma levels of sCD40 than total cholesterol (PMID: 16081359, 17012138, 11504730, 9144161). 27-hydroxycholesterol is an oxygenated derivative of cholesterol and a major oxysterol in circulation. 27-hydroxycholesterol is the product of the enzyme sterol 27-hydroxylase. The enzyme is critical for degradation of the steroid side-chain and a genetic deficiency of the enzyme leads to reduced formation of bile acids in humans. There is a correlation between 27-hydroxycholesterol and cholesterol in the circulation, and females have lower levels of 27-hydroxycholesterol than males. A strong correlation is observed between circulating levels of 27-hydroxycholesterol and cholesterol, in both healthy subjects and subjects with hypercholesterolemia and documented atherosclerosis. 27-hydroxycholesterol is metabolized by an oxysterol 7a-hydroxylase in the liver, and changes in the activity of this enzyme may lead to accumulation of 27-hydroxycholesterol in the circulation. It has been reported that patients with a genetic deficiency of oxysterol 7a-hydroxylase in the liver had markedly increased levels of 27-hydroxycholesterol in the circulation. Under normal conditions, however, and in the absence of liver or kidney disease, changes in the levels of 27-hydroxycholesterol in the circulation are likely to be caused by changes in the rate of synthesis of these steroids rather than by the rate of metabolism. Three possible explanations for the high concentrations of 27-hydroxycholesterol found in the circulation of the three subjects with atherosclerosis could be: 1) Increased expression of sterol 27-hydroxylase owing to a genetic factor or some other factor completely unrelated to atherosclerosis. 2) The extrahepatic sterol 27-hydroxylase may be up-regulated by circulating factors (e.g. cytokines) that are directly or indirectly related to the development of atherosclerosis. 3) The high amounts of cholesterol accumulating in macrophages in some patients with atherosclerosis may result in increased flux of 27-hydroxycholesterol from the macrophages to the circulation. (25R)-cholest-5-ene-3beta,26-diol is a 26-hydroxycholesterol in which the 25-position has R-configuration. It has a role as an apoptosis inducer, a neuroprotective agent, a human metabolite and a mouse metabolite. It is functionally related to a cholesterol. 27-Hydroxycholesterol is an endogenous metabolite of cholesterol produced by the hydroxylation of the carbon at position 27 by the enzyme sterol 26-hydroxylase, mitochondrial (CYP27A1). Some neoplasms produce excess of 27-hydroxycholesterol (27HC) or inhibit its catabolism, and high cholesterol levels are correlated with elevated levels of 27HC; under these conditions, 27HC may have deleterious selective estrogen receptor modulator (SERM) and liver X receptor (LXR) agonistic activities. As a SERM, 27HC binds to and prevents the activation of estrogen receptors (ERs) in the vasculature. This prevents ER-mediated vasodilation and abrogates the cardiovascular protective effects of estrogen. However, 27HC binds to and activates ERs and LXRs in breast tissue, which stimulates ER-dependent breast cancer cell growth and metastasis. 27-Hydroxycholesterol (27-OHC) is a selective estrogen receptor modulator and an agonist of the liver X receptor. 27-Hydroxycholesterol is a selective estrogen receptor modulator and an agonist of the liver X receptor.
7beta-Hydroxycholesterol
7beta-Hydroxycholesterol belongs to the class of organic compounds known as cholesterols and derivatives. Cholesterols and derivatives are compounds containing a 3-hydroxylated cholestane core. Thus, 7beta-hydroxycholesterol is considered to be a sterol lipid molecule. 7beta-Hydroxycholesterol is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. 7beta-Hydroxycholesterol has been identified in atheromatous plaques and in plasma of atherosclerotic patients (PMID: 16604541). 7beta-Hydroxycholesterol induces apoptosis in Caco-2 cells and alters lysosomal membrane integrity. It exhibits a specific enhancement of oxidative stress and of endonuclease G expression (PMID: 17136497). 7b-Hydroxycholesterol is identified in atheromatous plaques and in plasma of atherosclerotic patients.(PMID: 16604541)
7alpha-hydroxy-3-oxochol-4-en-24-oic Acid
7alpha-hydroxy-3-oxochol-4-en-24-oic Acid is also known as 3-oxo-7-Hydroxychol-4-enoic acid or 7-HOC acid. 7alpha-hydroxy-3-oxochol-4-en-24-oic Acid is considered to be practically insoluble (in water) and acidic. 7alpha-hydroxy-3-oxochol-4-en-24-oic Acid is a bile acid lipid molecule D005765 - Gastrointestinal Agents > D001647 - Bile Acids and Salts D005765 - Gastrointestinal Agents > D002793 - Cholic Acids 3-Oxo-7-hydroxychol-4-enoic acid is an endogenous metabolite. 3-Oxo-7-hydroxychol-4-enoic acid may be an important indicator of a poor prognosis in hepatobiliary disease[1].
7-KETOCHOLESTEROL
A cholestanoid that consists of cholesterol bearing an oxo substituent at position 7. D004791 - Enzyme Inhibitors 7-Ketocholesterol, toxic oxysterol, inhibits the rate-limiting step in bile acid biosynthesis cholesterol 7 alpha-hydroxylase, as well as strongly inhibiting HMG-CoA reductase (the rate-limiting enzyme in cholesterol biosynthesis). 7-Ketocholesterol induces cell apoptosis[1].
25-OHC
25-Hydroxycholesterol is a metabolite of cholesterol that is produced and secreted by macrophages in response to Toll-like receptor (TLR) activation. 25-hydroxycholesterol is a potent (EC50≈65 nM) and selective suppressor of IgA production by B cells.
(25R)-3alpha,7alpha,12alpha-trihydroxy-5beta-cholestan-26-oic acid
(25R)-5beta-cholestane-3alpha,7alpha,12alpha,26-tetrol
ST 27:1;O3
7α, 25-dihydroxycholesterol (7α,25-OHC) is a potent and selective agonist and endogenous ligand of the orphan GPCR receptor EBI2 (GPR183). 7α, 25-dihydroxycholesterol is highly potent at activating EBI2 (EC50=140 pM; Kd=450 pM). 7α, 25-dihydroxycholesterol can serve as a chemokine directing migration of B cells, T cells and dendritic cells[1][2].
(24S)-7alpha,24-dihydroxycholest-4-en-3-one
7alpha,24-Dihydroxycholest-4-en-3-one with S-configuration at C-24.
