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Deoxycholic acid

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Deoxycholic acid
Skeletal formula of deoxycholic acid
Ball-and-stick model of deoxycholic acid
White powder in a stoppered glass vial
Names
IUPAC name
(3α,5β,12α,20R)-3,12-Dihydroxycholan-24-oic acid
Other names
Deoxycholic acid
Deoxycholate
Kybella
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.001.344 Edit this at Wikidata
UNII
  • InChI=1S/C24H40O4/c1-14(4-9-22(27)28)18-7-8-19-17-6-5-15-12-16(25)10-11-23(15,2)20(17)13-21(26)24(18,19)3/h14-21,25-26H,4-13H2,1-3H3,(H,27,28)/t14-,15-,16-,17+,18-,19+,20+,21+,23+,24-/m1/s1 checkY
    Key: KXGVEGMKQFWNSR-LLQZFEROSA-N checkY
  • InChI=1/C24H40O4/c1-14(4-9-22(27)28)18-7-8-19-17-6-5-15-12-16(25)10-11-23(15,2)20(17)13-21(26)24(18,19)3/h14-21,25-26H,4-13H2,1-3H3,(H,27,28)/t14-,15-,16-,17+,18-,19+,20+,21+,23+,24-/m1/s1
    Key: KXGVEGMKQFWNSR-LLQZFEROBK
  • C[C@H](CCC(=O)O)[C@H]1CC[C@@H]2[C@@]1([C@H](C[C@H]3[C@H]2CC[C@H]4[C@@]3(CC[C@H](C4)O)C)O)C
Properties
C24H40O4
Molar mass 392.580 g·mol−1
Melting point 174–176 °C (345–349 °F; 447–449 K)
0.024%[1]
Acidity (pKa) 6.58[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Deoxycholic acid (conjugate base deoxycholate), also known as cholanoic acid , Kybella and 3α,12α-dihydroxy-5β-cholan-24-oic acid, is a bile acid. Deoxycholic acid is one of the secondary bile acids, which are metabolic byproducts of intestinal bacteria. The two primary bile acids secreted by the liver are cholic acid and chenodeoxycholic acid. Bacteria metabolize chenodeoxycholic acid into the secondary bile acid lithocholic acid, and they metabolize cholic acid into deoxycholic acid. There are additional secondary bile acids, such as ursodeoxycholic acid. Deoxycholic acid is soluble in alcohol and acetic acid. When pure, it comes in a white to off-white crystalline powder form.

Applications

Deoxycholic acid has been used since its discovery in various fields of human medicine. In the human body deoxycholic acid is used in the emulsification of fats for the absorption in the intestine. It has, in some countries (including Switzerland) been licensed as an emulsifier in food industry,[3] but it is no longer common. Outside the body it is used in experimental basis of cholagogues and is also in use to prevent and dissolve gallstones.

In research deoxycholic acid is used as a mild detergent for the isolation of membrane associated proteins. The critical micelle concentration for deoxycholic acid is approximately 2.4-4 mM.[4]

Sodium deoxycholate, the sodium salt of deoxycholic acid, is often used as a biological detergent to lyse cells and solubilise cellular and membrane components.[5] Sodium deoxycholate mixed with phosphatidylcholine, is used in mesotherapy injections to produce lipolysis, and has been used as an alternative to surgical excision in the treatment of lipomas.[6]

Deoxycholates and bile acid derivatives in general are actively being studied as structures for incorporation in nanotechnology.[7] They also have found application in microlithography as photoresistant components.[8]

In the United States, deoxycholic acid, under the trade name Kybella, is approved by the Food and Drug Administration for reducing moderate-to-severe fat below the chin.[9] When injected into submental fat, deoxycholic acid helps destroy fat cells.[9] Kybella is produced by Kythera Biopharmaceuticals.[10][11]

Research in immunology

Its function as a detergent and isolating agent for membrane proteins also suits it for production of outer membrane protein (OMP) vaccines such as MenB, a Norwegian vaccine developed in the early 1990s.[12] The MeNZB vaccine was produced using the same method.[13]

Deoxycholic acid is one of the main components of the traditional Chinese medicine "Niuhuang", which means "Oxen Yellow" and is bilestone of oxen. This has been in use for two millennia in the unproven belief that it treats inflammations and enhances the immune system.[14]

Deoxycholic acid binds and activates the membrane enzyme NAPE-PLD, which catalyzes the release of the endogenous cannabinoid anandamide and other N-acylethanolamines. These bioactive signaling molecules play important roles in several physiological pathways including stress and pain response, appetite, and lifespan.[15]

Some publications point towards the effect of deoxycholic acid as an immunostimulant[16][17] of the non-specific immune system, activating its main actors, the macrophages. According to these publications, a sufficient amount of deoxycholic acid in the human body would correspond with a good immune reaction of the non-specific immune system. Clinical studies conducted in the 1970s and 1980s confirm the expectation, that deoxycholic acid is involved in the natural healing processes of local inflammations,[18][19] different types of herpes,[20][21] and possibly cancer.[22][23] Due to the same acronym, DCA, as another potential cancer treatment, deoxycholic acid is often confused with dichloroacetic acid.

Research in cancer

Colonic epithelium from a mouse not undergoing colonic tumorigenesis (A), and a mouse that is undergoing colonic tumorigenesis (B). Cell nuclei are stained dark blue with hematoxylin (for nucleic acid) and immunostained brown for 8-oxo-dG. The level of 8-oxo-dG was graded in the nuclei of colonic crypt cells on a scale of 0-4. Mice not undergoing tumorigenesis had crypt 8-oxo-dG at levels 0 to 2 (panel A shows level 1) while mice progressing to colonic tumors had 8-oxo-dG in colonic crypts at levels 3 to 4 (panel B shows level 4) Tumorigenesis was induced by adding deoxycholate to the mouse diet to give a level of deoxycholate in the mouse colon similar to the level in the colon of humans on a high fat diet.[24] The images were made from original photomicrographs.

Deoxycholate and other secondary bile acids cause DNA damage.[25] Secondary bile acids increase intracellular production of reactive oxygen and reactive nitrogen species resulting in increased oxidative stress and DNA damage.[26][27] As shown in the figure in this section, deoxycholate added to the diet of mice increased the level of 8-oxo-dG, an oxidative DNA damage, in the colonic epithelium of mice. When the level of deoxycholate-induced DNA damage is high, DNA repair enzymes that ordinarily reverse DNA damage may not be able to keep up.

DNA damage has frequently been proposed as a major cause of cancer.[28][29][30] DNA damage can give rise to cancer by causing mutations.

When deoxycholate was added to the food of mice so that their feces contained deoxycholate at about the same level present in feces of human on a high fat diet, 45% to 56% of the mice developed colon cancer over the next 10 months.[24][31] Thus, exposure of the colon to deoxycholate can cause cancer.

In humans, higher levels of colonic deoxycholate are associated with higher frequencies of colon cancer. As an example, the fecal deoxycholate concentrations in African Americans (who eat a relatively high fat diet) is more than five times higher than fecal deoxycholate of Native Africans in South Africa (who eat a low fat diet).[32] Male African Americans have a high incidence of colon cancer of 72 per 100,000,[33] while Native Africans in South Africa have a low incidence rate of colon cancer of less than 1 per 100,000,[34] a more than 72-fold difference in rates of colon cancer.

Factors affecting deoxycholate levels

A number of factors, including diet, obesity, and exercise, affect the level of deoxycholate in the human colon. When humans were switched from their usual diet to a meat, egg and cheese based diet for five days, deoxycholate in their feces increased by factors of 2 to 10 fold.[35] Rats, fed diets with either 30% beef tallow (high fat) or 5% beef tallow (low fat) had almost 2-fold more deoxycholate in their feces on the high fat compared to the low fat diet.[36] In this study,[36] adding the further dietary elements of curcumin or caffeic acid to the rats' high fat (30% beef tallow) diet reduced the deoxycholate in their feces to levels comparable to levels seen in the rats on a low fat diet. Curcumin is a component of the spice turmeric, and caffeic acid is a component high in some fruits and spices.[37] Caffeic acid is also a digestive break-down product of chlorogenic acid, high in coffee and some fruits and vegetables.[38]

In addition to fats, the type or amount of protein in the diet may also affect bile acid levels. Switching from a diet with protein provided by casein to a diet with protein provided by salmon protein hydrolysate led to as much as a 6-fold increase in levels of bile acids in the blood plasma of rats.[39] In humans, adding high protein to a high fat diet raised the level of deoxycholate in the plasma by almost 50%.[40]

Obesity has been linked to cancer,[41] and this link is in part through deoxycholate.[42][43][44] In obese people, the relative proportion of Firmicutes (Gram-positive bacteria) in gut microbiota is increased resulting in greater conversion of the non-genotoxic primary bile acid, cholic acid, to carcinogenic deoxycholate.[42]

Exercise decreases deoxycholate in the colon. Humans whose level of physical activity placed them in the top third had a 17% decrease in fecal bile acid concentration compared to those whose level of physical activity placed them in the lowest third.[45] Rats provided with an exercise wheel had a lower ratio of secondary bile acids to primary bile acids than sedentary rats in their feces.[46] There is a positive association of exercise and physical activity with cancer prevention, tolerance to cancer-directed therapies (radiation and chemotherapy), reduction in recurrence, and improvement in survival.[47]

See also

References

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