Chenodesoxycholic acid (BioDeep_00002052735)

描述信息

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.[1][2][3] It was first isolated from the bile of the domestic goose, which gives it the "cheno" portion of its name (Greek: χήν = goose).[4]

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.[1] It occurs as a white crystalline substance insoluble in water but soluble in alcohol and acetic acid, with melting point at 165–167 °C.[citation needed]

Chenodeoxycholic acid is synthesized in the liver from cholesterol via several enzymatic steps.[1] Like other bile acids, it can be conjugated with taurine or glycine, forming taurochenodeoxycholate or glycochenodeoxycholate. Conjugation results in a lower pKa. This results in the conjugated bile acids being ionized at the usual pH in the intestine, and staying in the gastrointestinal tract until reaching the ileum to be reabsorbed.[3]

CDCA and other bile acids are surfactants forming micelles with fats, which facilitate lipid digestion. After absorption, they are taken up by the liver and resecreted, so undergoing an enterohepatic circulation. Unabsorbed CDCA can be metabolised by bacteria in the colon to form the secondary bile acid, lithocholic acid or the epimer, ursodeoxycholic acid.[3]

CDCA is the most potent natural bile acid at stimulating the nuclear bile acid receptor, farnesoid X receptor (FXR).[5] The transcription of many genes is activated by FXR, including those encoding FGF19 and small heterodimer partner.[6]
Chenodeoxycholic Acid is a hydrophobic primary bile acid that activates nuclear receptors (FXR) involved in cholesterol metabolism.
Chenodeoxycholic Acid is a hydrophobic primary bile acid that activates nuclear receptors (FXR) involved in cholesterol metabolism.

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