Enoxolone

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Enoxolone
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Clinical data
Trade namesArthrodont, PruClair
AHFS/Drugs.comInternational Drug Names
Routes of
administration		Oral, topical
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Legal status
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Identifiers
  • (2S,4aS,6aS,6bR,8aR,10S,12aS,12bR,14bR)-10-hydroxy-2,4a,6a,6b,9,9,12a-heptamethyl-13-oxo-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-icosahydropicene-2-carboxylic acid
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Chemical and physical data
FormulaC30H46O4
Molar mass470.694 g·mol−1
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  • O=C(O)[C@]5(C)C[C@H]4/C3=C/C(=O)[C@H]1[C@](CC[C@@H]2[C@]1(C)CC[C@H](O)C2(C)C)(C)[C@]3(C)CC[C@@]4(C)CC5
  • InChI=1S/C30H46O4/c1-25(2)21-8-11-30(7)23(28(21,5)10-9-22(25)32)20(31)16-18-19-17-27(4,24(33)34)13-12-26(19,3)14-15-29(18,30)6/h16,19,21-23,32H,8-15,17H2,1-7H3,(H,33,34)/t19-,21-,22-,23+,26+,27-,28-,29+,30+/m0/s1
  • Key:MPDGHEJMBKOTSU-YKLVYJNSSA-N
Data page
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Enoxolone (INN, BAN; also known as glycyrrhetinic acid or glycyrrhetic acid) is a pentacyclic triterpenoid derivative of the beta-amyrin type obtained from the hydrolysis of glycyrrhizic acid, which was obtained from the herb liquorice.

The substance has a sweet taste, so it is used in flavoring to mask the bitter taste of drugs like aloe and quinine. It may have some anti-inflammatory activities.[1] One of its metabolites is responsible for the blood pressure-increasing effect of liquorice.[2]

Medical uses

Oral topical

In Turkey, enoxolone is used in an "Anzibel" lozenge in combination with benzocaine (a local anesthetic) and chlorhexidine hydrochloride (an antibacterial).[3]

It is found in an over-the-counter "Arthrodont" toothpaste. Evidence for the ingredient's usefulness for plaque and gingivitis is lacking.[4]

Skin topical

In Japan, enoxolone is an active ingredient in the Salonpas brand of pain relief patch.[3]

It is also used in the Singaporean "Vetic" cream.[3] In the United States, it is found in PruClair, a "precription medical device" indicated for generic dermatoses.[5]

Possible other uses

Enoxolone is effective in the treatment of peptic ulcer and also has expectorant (antitussive) properties.[1] It has some additional pharmacological properties with possible antiviral, antifungal, antiprotozoal, and antibacterial activities.[6][7][8][9]

Mechanism of action

Anti-inflammatory

Glycyrrhetinic acid inhibits the enzymes (15-hydroxyprostaglandin dehydrogenase and delta-13-prostaglandin reductase) that metabolize the prostaglandins PGE-2 and PGF-2α to their respective, inactive 15-keto-13,14-dihydro metabolites. This increases prostaglandins in the digestive system. Prostaglandins inhibit gastric secretion, stimulate pancreatic secretion and mucous secretion in the intestines, and markedly increase intestinal motility. They also cause cell proliferation in the stomach. The effect on gastric acid secretion, and promotion of mucous secretion and cell proliferation shows why licorice has potential in treating peptic ulcers.[10]

Excessive consumption of glycyrrhetinic acid can cause a significant rise in blood pressure.[11] Liquorice root should not be consumed during pregnancy.[12]

The structure of glycyrrhetinic acid is similar to that of cortisone. Both molecules are flat and similar at positions 3 and 11. This might be the basis for liquorice's anti-inflammatory action.[citation needed]

Hypertensive

3-β-D-(Monoglucuronyl)-18-β-glycyrrhetinic acid, a metabolite of glycyrrhetinic acid, inhibits the conversion of 'active' cortisol to 'inactive' cortisone in the kidneys.[13] This occurs via inhibition of the enzyme 11-β-hydroxysteroid dehydrogenase.[citation needed] As a result, cortisol levels become high within the collecting duct of the kidney. Cortisol has intrinsic mineralocorticoid properties (that is, it acts like aldosterone and increases sodium reabsorption) that work on ENaC channels in the collecting duct. [citation needed] Hypertension develops due to this mechanism of sodium retention. People often have high blood pressure with a low renin and low aldosterone blood level.[citation needed] The increased amounts of cortisol binds to the unprotected, nonspecific mineralocorticoid receptors and induce sodium and fluid retention, hypokalaemia, high blood pressure, and inhibition of the renin-angiotensin-aldosterone system. Therefore, licorice should not be given to patients with a known history of hypertension in doses sufficient to inhibit 11-β-hydroxysteroid dehydrogenase.[2]

Derivatives

Glycyrrhetinic acid derivatives, where R is a variable functional group

In glycyrrhetinic acid, the functional group (R) is a hydroxyl group. Research in 2005 demonstrated that with a proper functional group a very effective glycyrrhetinic artificial sweetener can be obtained.[14] When R is an anionic NHCO(CH2)CO2K side chain, the sweetening effect is found to be 1200 times that of sugar (human sensory panel data). A shorter or longer spacer reduces the sweetening effect. One explanation is that the taste bud cell receptor has 1.3 nanometers (13 angstroms) available for docking with the sweetener molecule. In addition, the sweetener molecule requires three proton donor positions, of which two reside at the extremities, to be able to interact efficiently with the receptor cavity.

A synthetic analog, carbenoxolone, was developed in Britain. [citation needed] Both glycyrrhetinic acid and carbenoxolone have a modulatory effect on neural signaling through gap junction channels.

Acetoxolone, the acetyl derivative of glycyrrhetinic acid, is a drug used in the treatment of peptic ulcer and gastroesophageal reflux disease.

See also

References

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  1. ^ a b Page Module:Citation/CS1/styles.css has no content.Chandler RF (1985). "Liquorice, more than just a flavour". Canadian Pharmaceutical Journal (118): 420–424.
  2. ^ a b Page Module:Citation/CS1/styles.css has no content.van Uum SH (April 2005). "Liquorice and hypertension". The Netherlands Journal of Medicine. 63 (4): 119–120. PMID 15869038.
  3. ^ a b c Page Module:Citation/CS1/styles.css has no content."Enoxolone". Drug Bank. DB13089.
  4. ^ Page Module:Citation/CS1/styles.css has no content.Valkenburg C, Rosema NA, Hennequin-Hoenderdos NL, Versteeg PA, Slot DE, Van der Weijden GA (November 2021). "Do natural ingredients in a dentifrice contribute to prevention of plaque and gingivitis?". International Journal of Dental Hygiene. 19 (4): 429–439. doi:10.1111/idh.12517. PMC 8596674. PMID 33991392.
  5. ^ Page Module:Citation/CS1/styles.css has no content."PruClair Nonsteroidal Cream". DailyMed. U.S. National Library of Medicine.
  6. ^ Page Module:Citation/CS1/styles.css has no content.Badam L (June 1997). "In vitro antiviral activity of indigenous glycyrrhizin, licorice and glycyrrhizic acid (Sigma) on Japanese encephalitis virus". The Journal of Communicable Diseases. 29 (2): 91–99. PMID 9282507.
  7. ^ Page Module:Citation/CS1/styles.css has no content.Fuji HY, Tian J, Luka C (1986). "Effect of glycyrrhetinic acid on influenza virus and pathogenic bacteria". Bulletin Chinese Mater Medical. 11: 238–241.
  8. ^ Page Module:Citation/CS1/styles.css has no content.Guo N (October 1991). "[Protective effect of glycyrrhizine in mice with systemic Candida albicans infection and its mechanism]". Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae. 13 (5): 380–383. PMID 1839259.
  9. ^ Page Module:Citation/CS1/styles.css has no content.Salari MH, Sohrabi N, Kadkhoda Z, Khalili MB (2003). "Antibacterial effects of Enoxolone on periodontopathogenic capnophilic bacteria isolated from specimens of periodontitis patients". Iranian Biomedical Journal. 7: 39–42.
  10. ^ Page Module:Citation/CS1/styles.css has no content.Baker ME (February 1994). "Licorice and enzymes other than 11 beta-hydroxysteroid dehydrogenase: an evolutionary perspective". Steroids. 59 (2): 136–141. doi:10.1016/0039-128X(94)90091-4. PMID 8191543. S2CID 25938108.
  11. ^ Page Module:Citation/CS1/styles.css has no content.Franzson L, Manhem K, Ragnarsson J, Sigurdsson G, Wallerstedt S (August 2001). "Liquorice-induced rise in blood pressure: a linear dose-response relationship". Journal of Human Hypertension. 15 (8): 549–552. doi:10.1038/sj.jhh.1001215. PMID 11494093.
  12. ^ Page Module:Citation/CS1/styles.css has no content."Foods to avoid in pregnancy". NHS. 2 December 2020. Retrieved 28 July 2025.
  13. ^ Page Module:Citation/CS1/styles.css has no content.Kato H, Kanaoka M, Yano S, Kobayashi M (June 1995). "3-Monoglucuronyl-glycyrrhetinic acid is a major metabolite that causes licorice-induced pseudoaldosteronism". The Journal of Clinical Endocrinology and Metabolism. 80 (6): 1929–1933. doi:10.1210/jcem.80.6.7775643. PMID 7775643.
  14. ^ Page Module:Citation/CS1/styles.css has no content.Ijichi S, Tamagaki S (2005). "Molecular Design of Sweet Tasting Compounds Based on 3β-Amino-3β-deoxy-18β-glycyrrhetinic Acid: Amido Functionality Eliciting Tremendous Sweetness". Chemistry Letters. 34 (3): 356–357. doi:10.1246/cl.2005.356. Retrieved 2010-09-28.[permanent dead link]

Further reading

  • Saponin Glycosides Script error: No such module "webarchive"., by Georges-Louis Friedli, URL accessed Sept 2010.
  • Page Template:Sister-inline/styles.css has no content.Script error: No such module "Sister project logo". Media related to Script error: No such module "Commons link". at Wikimedia Commons

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