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Taurochenodeoxycholate
Taurochenodeoxycholic acid is a bile acid formed in the liver of most species, including humans, by conjugation of chenodeoxycholic acid with taurine. It is secreted into bile and then into the intestine. It is usually ionized at physiologic pH. However, although it can be crystallized as the sodium salt. It acts as a detergent to solubilize fats in the small intestine and is itself absorbed by active transport in the terminal ileum. It is used as a cholagogue and choleretic. Substantial evidence indicates that high circulating bile acids promote colon cancer risk. In a prospective study, positive associations were observed between prediagnostic plasma levels of seven conjugated bile acid metabolites, including taurochenodeoxycholic acid, and colon cancer risk. See also * Tauroursodeoxycholic acid, an epimer * See article about Taurodeoxycholic acid as an interferent in Perfluorooctanesulfonic acid Perfluorooctanesulfonic acid (PFOS) (conjugate acid, conjugate base perfl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chenodeoxycholic Acid
Chenodeoxycholic acid (CDCA; also known as chenodesoxycholic acid, chenocholic acid and 3α,7α-dihydroxy-5β-cholan-24-oic acid) is a bile acid. Salts of this carboxylic acid are called chenodeoxycholates. Chenodeoxycholic acid is one of the main bile acids. It was first isolated from the bile of the domestic goose, which gives it the "cheno" portion of its name (Greek: χήν = goose). Structure Chenodeoxycholic acid and cholic acid are the two primary bile acids in humans. Chenodeoxycholic acid has two hydroxyl groups and is modified with the addition of another hydroxyl group to produce cholic acid. Some other mammals have muricholic acid or deoxycholic acid rather than chenodeoxycholic acid. It occurs as a white crystalline substance insoluble in water but soluble in alcohol and acetic acid, with melting point at 165–167 °C. Biosynthesis and function Chenodeoxycholic acid is synthesized in the liver from cholesterol via several enzymatic steps. Like othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bile Acid
Bile acids are steroid acids found predominantly in the bile of mammals and other vertebrates. Diverse bile acids are synthesized in the liver in peroxisomes. Bile acids are conjugated with taurine or glycine residues to give anions called bile salts. Primary bile acids are those synthesized by the liver. Secondary bile acids result from bacterial actions in the colon. In humans, taurocholic acid and glycocholic acid (derivatives of cholic acid) and taurochenodeoxycholic acid and glycochenodeoxycholic acid (derivatives of chenodeoxycholic acid) are the major bile salts. The salts of their 7-alpha-dehydroxylated derivatives, deoxycholic acid and lithocholic acid, are also found, with derivatives of cholic, chenodeoxycholic and deoxycholic acids accounting for over 90% of human biliary bile acids. Description Bile acids comprise about 80% of the organic compounds in bile (others are phospholipids and cholesterol). An increased secretion of bile acids produces an increase ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taurine
Taurine (), or 2-aminoethanesulfonic acid, is a naturally occurring amino sulfonic acid that is widely distributed in animal tissues. It is a major constituent of bile and can be found in the large intestine. It is named after Latin (cognate to Ancient Greek , ) meaning bull or ox, as it was first isolated from ox bile in 1827 by German scientists Friedrich Tiedemann and Leopold Gmelin. It was identified in human bile in 1846 by Edmund Ronalds. Although taurine is abundant in human organs, it is not an essential human dietary nutrient and is not included among nutrients with a recommended intake level. Among the diverse pathways by which natural taurine can be biosynthesized, its human pathways (primarily in the human liver) are from cysteine and/or methionine. Taurine is commonly sold as a dietary supplement, but there is no good clinical evidence that taurine supplements provide any benefit to human health. Taurine is used as a food additive for cats (who require ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bile
Bile (from Latin ''bilis''), also known as gall, is a yellow-green/misty green fluid produced by the liver of most vertebrates that aids the digestion of lipids in the small intestine. In humans, bile is primarily composed of water, is produced continuously by the liver, and is stored and concentrated in the gallbladder. After a human eats, this stored bile is discharged into the first section of the small intestine, known as the duodenum. Composition In the human liver, bile is composed of 97–98% water, 0.7% bile salts, 0.2% bilirubin, 0.51% fats ( cholesterol, fatty acids, and lecithin), and 200 meq/L inorganic salts. The two main pigments of bile are bilirubin, which is orange-yellow, and its oxidised form biliverdin, which is green. When mixed, they are responsible for the brown color of feces. About of bile is produced per day in adult human beings. Function Bile or gall acts to some extent as a surfactant, helping to emulsify the lipids in food. B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ileum
The ileum () is the final section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In fish, the divisions of the small intestine are not as clear and the terms posterior intestine or distal intestine may be used instead of ileum. Its main function is to absorb vitamin B12, vitamin B12, bile salts, and whatever products of digestion that were not absorbed by the jejunum. The ileum follows the duodenum and jejunum and is separated from the cecum by the ileocecal valve (ICV). In humans, the ileum is about 2–4 m long, and the pH is usually between 7 and 8 (neutral or slightly base (chemistry), basic). ''Ileum'' is derived from the Greek word εἰλεός (eileós), referring to a medical condition known as ileus. Structure The ileum is the third and final part of the small intestine. It follows the jejunum and ends at the ileocecal junction, where the wikt:terminal, terminal ileum communicates with the cecum of the large intestine thro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cholagogue
A cholagogue is a substance that is purported by humoral practitioners to encourage the discharge of bile from the system, purging it downward. Deployment is no longer recommended because the biliary purge, like the traditional kidney purge, can cause pancreatic problems. In Patrick O'Brian's ''Post Captain'' (Ch. 10), which is set in the Napoleonic era, Stephen Maturin, one of the book's main characters (who is also a physician, naturalist and spy) sits in the snug of the Rose and Crown in Deal, Kent Deal is a coastal town in Kent, England, which lies where the North Sea and the English Channel meet, north-east of Dover, England, Dover and south of Ramsgate. It is a former fishing, mining and garrison town whose history is closely linked t ..., and drinks a "good" tea described as an "unrivalled cholagogue". Cyclovalone is a choleretic and cholagogic agent. References * Chambers, Ephraim, ed. (1728). '' Cyclopaedia, or an Universal Dictionary of Arts and Sciences'' (firs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Choleretic
Choleretics are substances that increase the volume of secretion of bile from the liver as well as the amount of solids secreted. By stimulating the production of bile, the body is better able to release toxins and through acting as a natural laxative and improving detox capacity of Cells and Tissue (biology) In biology, tissue is an assembly of similar cells and their extracellular matrix from the same embryonic origin that together carry out a specific function. Tissues occupy a Biological organisation#Levels, biological organizational level betw .... See also * Cholekinetic * Hydrocholeretic References {{gastrointestinal-drug-stub Bile acids ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colorectal Cancer
Colorectal cancer (CRC), also known as bowel cancer, colon cancer, or rectal cancer, is the development of cancer from the Colon (anatomy), colon or rectum (parts of the large intestine). Signs and symptoms may include Lower gastrointestinal bleeding, blood in the stool, a change in bowel movements, weight loss, abdominal pain and fatigue. Most colorectal cancers are due to lifestyle factors and genetic disorders. Risk factors include diet, obesity, smoking, and lack of physical activity. Dietary factors that increase the risk include red meat, processed meat, and alcohol (drug), alcohol. Another risk factor is inflammatory bowel disease, which includes Crohn's disease and ulcerative colitis. Some of the inherited genetic disorders that can cause colorectal cancer include familial adenomatous polyposis and hereditary non-polyposis colon cancer; however, these represent less than 5% of cases. It typically starts as a adenoma, benign tumor, often in the form of a colorectal poly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tauroursodeoxycholic Acid
Ursodoxicoltaurine is the international nonproprietary name (INN) for the pharmaceutical form of tauroursodeoxycholic acid (TUDCA). It is also known as taurursodiol. Tauroursodeoxycholic acid is a naturally occurring hydrophilic bile acid which is the taurine conjugated form of ursodeoxycholic acid (UDCA). Humans have only trace amounts of tauroursodeoxycholic acid but bears have large amounts of tauroursodeoxycholic acid and ursodeoxycholic acid in their bile. Synthesis Bile acids are naturally synthesized from cholesterol in the liver and are conjugated with specific amino-acids, specifically taurine. Bear bile contains several bile acids including taurochenodeoxycholic acid, ursodeoxycholic acid, and chenodeoxycholic acid. UDCA and its taurine conjugates comprise about 47% of the bile in American black bears and up to 76% in Asiatic black bear, Asiatic bears. Ursodeoxycholic acid and tauroursodeoxycholic acid were first chemically synthesized in 1954 in Japan. Ursodeoxycho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epimer
In stereochemistry, an epimer is one of a pair of diastereomers. The two epimers have opposite configuration at only one stereogenic center out of at least two. All other stereogenic centers in the molecules are the same in each. Epimerization is the interconversion of one epimer to the other epimer. Doxorubicin and epirubicin are two epimers that are used as drugs. Examples The stereoisomers β-D- glucopyranose and β-D- mannopyranose are epimers because they differ only in the stereochemistry at the C-2 position. The hydroxy group in β-D-glucopyranose is equatorial (in the "plane" of the ring), while in β-D-mannopyranose the C-2 hydroxy group is axial (up from the "plane" of the ring). These two molecules are epimers but, because they are not mirror images of each other, are not enantiomers. (Enantiomers have the same name, but differ in D and L classification.) They are also not sugar anomers, since it is not the anomeric carbon involved in the stereochemistry. Simila ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taurodeoxycholic Acid
Taurodeoxycholic acid is a bile acid. This compound is a closely related isomer of taurochenodeoxycholic acid and tauroursodeoxycholic acid sharing the exact molecular formula and molecular weight. Taurodeoxycholic acid and its isomers have molecular masses similar to perfluorooctanesulfonic acid (PFOS) and therefore may interfere with interpretation of mass spectrometry data, leading to a false indication of the presence of PFOS in a biological sample. Serum concentration of taurodeoxycholic acid, a downstream microbial metabolite of cholic acid, is associated with a strong increased risk of colorectal cancer among women. Also, the determination of taurodeoxycholic acid 3-sulfate in blood samples may potentially be useful as a risk factor and screening biomarker for lung cancer Lung cancer, also known as lung carcinoma, is a malignant tumor that begins in the lung. Lung cancer is caused by genetic damage to the DNA of cells in the airways, often caused by cigarett ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perfluorooctanesulfonic Acid
Perfluorooctanesulfonic acid (PFOS) (conjugate acid, conjugate base perfluorooctanesulfonate) is a chemical compound having an eight-carbon fluorocarbon chain and a sulfonic acid functional group, and thus it is a perfluorosulfonic acid and a Per- and polyfluoroalkyl substances, perfluoroalkyl substance (PFAS). It is an Human impact on the environment, anthropogenic (man-made) fluorosurfactant, now regarded as a global pollutant. PFOS was the key ingredient in Scotchgard, a fabric protector made by 3M, and related stain repellents. The acronym "PFOS" refers to the parent sulfonic acid and to various Salt (chemistry), salts of perfluorooctanesulfonate. These are all colorless or white, water-soluble solids. Although of low acute toxicity, PFOS has attracted much attention for its pervasiveness and environmental impact. It was added to Annex B of the Stockholm Convention on Persistent Organic Pollutants in May 2009. History In 1949, 3M began producing PFOS-based compounds by electro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
