Target type: biologicalprocess
Uptake of cholesterol into the blood by absorption from the small intestine. [GOC:mah]
Intestinal cholesterol absorption is a complex process that involves the coordinated action of several factors. Dietary cholesterol, primarily found in animal products, enters the small intestine and undergoes a series of steps to be absorbed into the bloodstream.
1. **Emulsification and Micelle Formation:** Cholesterol, being hydrophobic, is initially insoluble in the aqueous environment of the intestinal lumen. Bile salts, synthesized in the liver and secreted into the duodenum, play a crucial role in emulsifying dietary fat, including cholesterol, into tiny droplets. These droplets are further broken down by pancreatic lipase, an enzyme that breaks down triglycerides into fatty acids and monoglycerides.
2. **Micelle Formation:** The bile salts then form mixed micelles, which are small, spherical structures containing cholesterol, fatty acids, monoglycerides, and phospholipids. These micelles are essential for transporting cholesterol to the intestinal brush border, the surface of the intestinal cells.
3. **Absorption:** Cholesterol within the micelles is then absorbed into the intestinal cells by a process called passive diffusion. This means that cholesterol moves from an area of high concentration (the micelle) to an area of low concentration (the intestinal cell) without requiring energy.
4. **Cholesterol Esterification:** Once inside the intestinal cell, cholesterol is esterified by a specific enzyme called acyl-CoA:cholesterol acyltransferase (ACAT). Esterification converts free cholesterol into cholesteryl esters, which are more hydrophobic and less readily absorbed.
5. **Packaging and Transport:** The cholesteryl esters, along with other lipids, are then packaged into chylomicrons, which are large lipoprotein particles. Chylomicrons are released from the intestinal cells and enter the lymphatic system.
6. **Lymphatic Transport:** The chylomicrons travel through the lymphatic system and eventually enter the bloodstream. They are transported to various tissues, including the liver, where they are further processed.
7. **Liver Metabolism:** In the liver, cholesteryl esters are hydrolyzed back into free cholesterol. The liver plays a crucial role in regulating cholesterol levels in the body. It can synthesize new cholesterol, excrete cholesterol in bile, and convert cholesterol into other important molecules like bile acids.
Factors influencing intestinal cholesterol absorption include dietary intake of cholesterol, bile salt production, genetic factors, and certain medications.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| NPC1-like intracellular cholesterol transporter 1 | An NPC1-like intracellular cholesterol transporter 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9UHC9] | Homo sapiens (human) |
| Aldo-keto reductase family 1 member C1 | An aldo-keto reductase family 1 member C1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q04828] | Homo sapiens (human) |
| Pancreatic triacylglycerol lipase | A pancreatic triacylglycerol lipase that is encoded in the genome of human. [PRO:DNx, UniProtKB:P16233] | Homo sapiens (human) |
| Low-density lipoprotein receptor | A low-density lipoprotein receptor that is encoded in the genome of human. [PRO:DNx, UniProtKB:P01130] | Homo sapiens (human) |
| Sterol O-acyltransferase 2 | A sterol O-acyltransferase 2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:O75908] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| benzbromarone | benzbromarone : 1-Benzofuran substituted at C-2 and C-3 by an ethyl group and a 3,5-dibromo-4-hydroxybenzoyl group respectively. An inhibitor of CYP2C9, it is used as an anti-gout medication. Benzbromarone: Uricosuric that acts by increasing uric acid clearance. It is used in the treatment of gout. | 1-benzofurans; aromatic ketone | uricosuric drug |
| diethyl pyrocarbonate | diethyl pyrocarbonate : The diethyl ester of dicarbonic acid. Diethyl Pyrocarbonate: Preservative for wines, soft drinks, and fruit juices and a gentle esterifying agent. | acyclic carboxylic anhydride | |
| flufenamic acid | flufenamic acid : An aromatic amino acid consisting of anthranilic acid carrying an N-(trifluoromethyl)phenyl substituent. An analgesic and anti-inflammatory, it is used in rheumatic disorders. Flufenamic Acid: An anthranilic acid derivative with analgesic, anti-inflammatory, and antipyretic properties. It is used in musculoskeletal and joint disorders and administered by mouth and topically. (From Martindale, The Extra Pharmacopoeia, 30th ed, p16) | aromatic amino acid; organofluorine compound | antipyretic; EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; non-narcotic analgesic; non-steroidal anti-inflammatory drug |
| flurbiprofen | flurbiprofen : A monocarboxylic acid that is a 2-fluoro-[1,1'-biphenyl-4-yl] moiety linked to C-2 of propionic acid. A non-steroidal anti-inflammatory, analgesic and antipyretic, it is used as a pre-operative anti-miotic as well as orally for arthritis or dental pain. Flurbiprofen: An anti-inflammatory analgesic and antipyretic of the phenylalkynoic acid series. It has been shown to reduce bone resorption in periodontal disease by inhibiting CARBONIC ANHYDRASE. | fluorobiphenyl; monocarboxylic acid | antipyretic; EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; non-narcotic analgesic; non-steroidal anti-inflammatory drug |
| gliclazide | Gliclazide: An oral sulfonylurea hypoglycemic agent which stimulates insulin secretion. | N-sulfonylurea | hypoglycemic agent; insulin secretagogue; radical scavenger |
| glimepiride | glimepiride: structure given in first source | sulfonamide | |
| indomethacin | indometacin : A member of the class of indole-3-acetic acids that is indole-3-acetic acid in which the indole ring is substituted at positions 1, 2 and 5 by p-chlorobenzoyl, methyl, and methoxy groups, respectively. A non-steroidal anti-inflammatory drug, it is used in the treatment of musculoskeletal and joint disorders including osteoarthritis, rheumatoid arthritis, gout, bursitis and tendinitis. Indomethacin: A non-steroidal anti-inflammatory agent (NSAID) that inhibits CYCLOOXYGENASE, which is necessary for the formation of PROSTAGLANDINS and other AUTACOIDS. It also inhibits the motility of POLYMORPHONUCLEAR LEUKOCYTES. | aromatic ether; indole-3-acetic acids; monochlorobenzenes; N-acylindole | analgesic; drug metabolite; EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; environmental contaminant; gout suppressant; non-steroidal anti-inflammatory drug; xenobiotic; xenobiotic metabolite |
| meclofenamic acid | meclofenamic acid : An aminobenzoic acid that is anthranilic acid in which one of the hydrogens attached to the nitrogen is replaced by a 2,6-dichloro-3-methylphenyl group. A non-steroidal anti-inflammatory drug, it is used as the sodium salt for the treatment of dysmenorrhoea (painful periods), osteoarthritis and rheumatoid arthritis. Meclofenamic Acid: A non-steroidal anti-inflammatory agent with antipyretic and antigranulation activities. It also inhibits prostaglandin biosynthesis. | aminobenzoic acid; organochlorine compound; secondary amino compound | analgesic; anticonvulsant; antineoplastic agent; antipyretic; antirheumatic drug; EC 1.13.11.34 (arachidonate 5-lipoxygenase) inhibitor; EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; non-steroidal anti-inflammatory drug |
| mefenamic acid | mefenamic acid : An aminobenzoic acid that is anthranilic acid in which one of the hydrogens attached to the nitrogen is replaced by a 2,3-dimethylphenyl group. Although classed as a non-steroidal anti-inflammatory drug, its anti-inflammatory properties are considered to be minor. It is used to relieve mild to moderate pain, including headaches, dental pain, osteoarthritis and rheumatoid arthritis. Mefenamic Acid: A non-steroidal anti-inflammatory agent with analgesic, anti-inflammatory, and antipyretic properties. It is an inhibitor of cyclooxygenase. | aminobenzoic acid; secondary amino compound | analgesic; antipyretic; antirheumatic drug; EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; environmental contaminant; non-steroidal anti-inflammatory drug; xenobiotic |
| dehydroepiandrosterone | dehydroepiandrosterone : An androstanoid that is androst-5-ene substituted by a beta-hydroxy group at position 3 and an oxo group at position 17. It is a naturally occurring steroid hormone produced by the adrenal glands. Dehydroepiandrosterone: A major C19 steroid produced by the ADRENAL CORTEX. It is also produced in small quantities in the TESTIS and the OVARY. Dehydroepiandrosterone (DHEA) can be converted to TESTOSTERONE; ANDROSTENEDIONE; ESTRADIOL; and ESTRONE. Most of DHEA is sulfated (DEHYDROEPIANDROSTERONE SULFATE) before secretion. | 17-oxo steroid; 3beta-hydroxy-Delta(5)-steroid; androstanoid | androgen; human metabolite; mouse metabolite |
| medroxyprogesterone acetate | 20-oxo steroid; 3-oxo-Delta(4) steroid; acetate ester; corticosteroid; steroid ester | adjuvant; androgen; antineoplastic agent; antioxidant; female contraceptive drug; inhibitor; progestin; synthetic oral contraceptive | |
| 3,5-dichlorosalicylic acid | 3,5-dichlorosalicylic acid: structure in first source | chlorobenzoic acid | |
| 3,5-dibromosalicylic acid | 3,5-dibromosalicylic acid: structure in first source | ||
| dexibuprofen | dexibuprofen: structure in first source | ibuprofen | non-narcotic analgesic; non-steroidal anti-inflammatory drug |
| octyl gallate | gallate ester | food antioxidant; hypoglycemic agent; plant metabolite | |
| 25-hydroxycholesterol | 25-hydroxy steroid; oxysterol | human metabolite | |
| salvin | salvin: a biocyclic diterpenoid; from sage and rosemary (Lamiaceae) | abietane diterpenoid; carbotricyclic compound; catechols; monocarboxylic acid | angiogenesis modulating agent; anti-inflammatory agent; antineoplastic agent; antioxidant; apoptosis inducer; food preservative; HIV protease inhibitor; plant metabolite |
| 7-ketocholesterol | 7-ketocholesterol : A cholestanoid that consists of cholesterol bearing an oxo substituent at position 7. 7-ketocholesterol: inhibits uptake of cholesterol in rabbit aorta | 3beta-hydroxy-Delta(5)-steroid; 3beta-sterol; 7-oxo steroid; cholestanoid | neuroprotective agent |
| cholestane-3,5,6-triol, (3beta, 5alpha, 6beta)-isomer | 3beta-hydroxy steroid; 5alpha-hydroxy steroid; 6beta-hydroxy steroid | ||
| Koenimbine | koenimbin: has antineoplastic activity; isolated from curry leaf, Murraya koenigii; structure in first source | carbazoles | |
| 6-ketocholestanol | |||
| ezetimibe | ezetimibe : A beta-lactam that is azetidin-2-one which is substituted at 1, 3, and 4 by p-fluorophenyl, 3-(p-fluorophenyl)-3-hydroxypropyl, and 4-hydroxyphenyl groups, respectively (the 3R,3'S,4S enantiomer). Ezetimibe: An azetidine derivative and ANTICHOLESTEREMIC AGENT that inhibits intestinal STEROL absorption. It is used to reduce total CHOLESTEROL; LDL CHOLESTEROL, and APOLIPOPROTEINS B in the treatment of HYPERLIPIDEMIAS. | azetidines; beta-lactam; organofluorine compound | anticholesteremic drug; antilipemic drug; antimetabolite |
| atractylenolide iii | atractylenolide III: from Atractylodes macrocephala Koidz; structure in first source | naphthofuran | metabolite |
| naproxen | naproxen : A methoxynaphthalene that is 2-methoxynaphthalene substituted by a carboxy ethyl group at position 6. Naproxen is a non-steroidal anti-inflammatory drug commonly used for the reduction of pain, fever, inflammation and stiffness caused by conditions such as osteoarthritis, kidney stones, rheumatoid arthritis, psoriatic arthritis, gout, ankylosing spondylitis, menstrual cramps, tendinitis, bursitis, and for the treatment of primary dysmenorrhea. It works by inhibiting both the COX-1 and COX-2 enzymes. Naproxen: An anti-inflammatory agent with analgesic and antipyretic properties. Both the acid and its sodium salt are used in the treatment of rheumatoid arthritis and other rheumatic or musculoskeletal disorders, dysmenorrhea, and acute gout. | methoxynaphthalene; monocarboxylic acid | antipyretic; cyclooxygenase 1 inhibitor; cyclooxygenase 2 inhibitor; drug allergen; environmental contaminant; gout suppressant; non-narcotic analgesic; non-steroidal anti-inflammatory drug; xenobiotic |
| ys 64 | cholestan-6-oxo-3,5-diol: metabolite of 5,6-epoxycholesterol; structure in first source | cholestanoid | |
| avasimibe | monoterpenoid | ||
| mahanimbine | mahanimbine: from Murraya koenigii leaves; structure in first source | carbazoles | |
| 22s-hydroxycholesterol | (22S)-22-hydroxycholesterol : An oxysterol that is the 22S-hydroxy derivative of cholesterol. | 22-hydroxy steroid; 3beta-hydroxy-Delta(5)-steroid; oxysterol | |
| carnosol | carnosol: isolated from Lepechinia hastata | diterpenoid | |
| cholest-5-en-3 beta,7 alpha-diol, (3beta,7beta)-isomer | 7beta-hydroxy steroid; oxysterol | ||
| beta-hydroxyisovalerylshikonin | |||
| shikonin | shikonin: a naphthazarin; has antineoplastic and angiogenesis inhibiting activities | hydroxy-1,4-naphthoquinone | |
| s 1033 | (trifluoromethyl)benzenes; imidazoles; pyridines; pyrimidines; secondary amino compound; secondary carboxamide | anticoronaviral agent; antineoplastic agent; tyrosine kinase inhibitor | |
| alpha-phenylcinnamate | alpha-phenylcinnamate: RN given refers to parent cpd | ||
| orlistat | orlistat : A carboxylic ester resulting from the formal condensation of the carboxy group of N-formyl-L-leucine with the hydroxy group of (3S,4S)-3-hexyl-4-[(2S)-2-hydroxytridecyl]oxetan-2-one. A pancreatic lipase inhibitor, it is used as an anti-obesity drug. Orlistat: A lactone derivative of LEUCINE that acts as a pancreatic lipase inhibitor to limit the absorption of dietary fat; it is used in the management of obesity. | beta-lactone; carboxylic ester; formamides; L-leucine derivative | anti-obesity agent; bacterial metabolite; EC 2.3.1.85 (fatty acid synthase) inhibitor; EC 3.1.1.3 (triacylglycerol lipase) inhibitor |
| pactimibe | |||
| jasmonic acid | jasmonic acid : An oxo monocarboxylic acid that is (3-oxocyclopentyl)acetic acid substituted by a (2Z)-pent-2-en-1-yl group at position 2 of the cyclopentane ring. jasmonic acid: a derivative of alpha-linolenic acid that has a role in plant response to herbivory analogous to the role of prostanoids in inflammation in mammals; | oxo monocarboxylic acid | jasmonates; plant metabolite |
| caffeic acid phenethyl ester | phenethyl caffeate : An alkyl caffeate ester in which 2-phenylethyl is the alkyl component. | alkyl caffeate ester | anti-inflammatory agent; antibacterial agent; antineoplastic agent; antioxidant; antiviral agent; immunomodulator; metabolite; neuroprotective agent |
| muromonab-cd3 | cudraflavone B : An extended flavonoid that consists of a pyranochromane skeleton that is 2H,6H-pyrano[3,2-g]chromen-6-one substituted by geminal methyl groups at position 2, a 2,4-dihydroxyphenyl group at position 8, a hydroxy group at position 5 and a prenyl group at position 7. Isolated from Morus alba and Morus species it exhibits anti-inflammatory activity. cudraflavone B: antiproliferative from Cudrania tricuspidata | extended flavonoid; pyranochromane; trihydroxyflavone | anti-inflammatory agent; plant metabolite |
| macluraxanthone b | macluraxanthone B : A member of the class of xanthones that is 9H-xanthen-9-one substituted by hydroxy groups at positions 1, 3, 6 and 7, a dimethylallyl group at position 2 and a prenyl group at position 4. Isolated from Maclura tinctoria and Cudrania tricuspidata, it exhibits anti-HIV and antineoplastic activity. macluraxanthone B: from the plant Maclura tinctoria; structure in first source | phenols; xanthones | anti-HIV agent; antineoplastic agent; metabolite |
| oleoylanilide | oleoylanilide: alters lipid metabolism of lung & adipose tissue; do not confuse with oleoanilide; RN given refers to (Z)-isomer oleylanilide : The fatty amide resulting from the formal condensation of oleic acid and aniline. | anilide; fatty amide | |
| manzamine a | manzamine A : An alkaloid of the class of beta-carbolines isolated from Haliclona and Acanthostrongylophora. It exhibits inhibitory activity against Glycogen Synthase Kinase-3 (EC 2.7.11.26). manzamine A: RN given refers to (1R-(1R*,9Z,13S*,13aR*,20aR*,21aR*)-isomer; RN for cpd without isomeric designation not avail 12/92 | alkaloid; beta-carbolines; isoquinolines | animal metabolite; anti-HSV-1 agent; antimalarial; antineoplastic agent; EC 2.7.11.26 (tau-protein kinase) inhibitor; marine metabolite |
| eflucimibe | eflucimibe: a powerful and systemic acylcoenzyme A: cholesterol acyltransferase inhibitor | ||
| sch 60663 | SCH 60663: structure in first source | ||
| cudraxanthone l | cudraxanthone L: from the root bark of Cudrania tricuspidata; structure in first source | ||
| pyripyropene a | pyripyropene A : A sesquiterpenoid that consists of (3S,4R,4aR,6S,6aS,12R,12aS,12bS)-4-(acetoxymethyl)-12-hydroxy-4,6a,12b-trimethyl-11-oxo-9-(pyridin-3-yl)-1,3,4,4a,5,6,6a,12,12a,12b-decahydro-2H,11H-benzo[f]pyrano[4,3-b]chromene-3,6-diol in which the hydrogens of the 3- and 6-hydroxy functions are substituted by acetyl groups. pyripyropene A: from Aspergillus fumigatus FO-1289; structure given in first source | organic heterotetracyclic compound; sesquiterpenoid | acyl-CoA:cholesterol acyltransferase 2 inhibitor; metabolite |
| cudraflavanone a | cudraflavanone A: antineoplastic from Cudrania tricuspidata; structure in first source | ||
| cholenic acid dimethylamide | cholenic acid dimethylamide: binds LXRalpha receptor; structure in first source | ||
| azd7687 | AZD7687: structure in first source | ||
| manassantin a | manassantin A : A lignan isolated from Saururus cernuus and Saururus chinensis and has been shown to exhibit antineoplastic activity. manassantin A: a dineolignan from Saururus cernuus; structure in first source |