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Cholestatic pruritus is the sensation of itch due to nearly any liver disease, but the most commonly associated entities are primary biliary cholangitis, primary sclerosing cholangitis, obstructive choledocholithiasis, carcinoma of the bile duct, cholestasis (also see drug-induced pruritus), and chronic hepatitis C viral infection and other forms of viral hepatitis.
Taurocholic acid, known also as cholaic acid, cholyltaurine, or acidum cholatauricum, is a deliquescent yellowish crystalline bile acid involved in the emulsification of fats. It occurs as a sodium salt in the bile of mammals. It is a conjugate of cholic acid with taurine. In medical use, it is administered as a cholagogue and choleretic. [1]
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. [ 2 ] [ 3 ] The two main pigments of bile are bilirubin , which is orange-yellow, and its oxidised form biliverdin , which is green.
These conjugated bile acids are often referred to as bile salts. The pKa of the unconjugated bile acids are between 5 and 6.5, [ 4 ] and the pH of the duodenum ranges between 3 and 5, so when unconjugated bile acids are in the duodenum, they are almost always protonated (HA form), which makes them relatively insoluble in water.
Cholic acid, also known as 3α,7α,12α-trihydroxy-5β-cholan-24-oic acid is a primary bile acid [3] that is insoluble in water (soluble in alcohol and acetic acid), it is a white crystalline substance. Salts of cholic acid are called cholates.
Bile salt hydrolases are members of the N-terminal nucleophilic hydrolase family, characterized by autocatalytic activation by an N-terminal nucleophile and subsequent amide bond cleavage. [ 2 ] [ 5 ] The majority of BSH enzymes are composed of homotetramers , although they have been known to assume other forms including homodimers and ...
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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.