Melissa Kaplan's
Herp Care Collection
Last updated January 1, 2014

Glucuronidation

©2001 Melissa Kaplan

Glucuronide: a glycoside that yields glucuronic acid upon hydrolysis.

Glucaronic acid: an acid, C6H10O7, formed by the oxidation of glucose, found combined with other products of metabolism in the blood and urine.

Glucuronidase (beta-glucuronidase): an enzyme that hydrolyzes a glucuronide, destroying glucuronidation, especially that which occurs widely (as in liver and spleen) and hydrolyzes the beta form of a glucuronide

Glucuronidation plays many roles in the body, not just that of binding estrogen, thus one may have low or normal levels of glucaronic acid along with low, normal or high levels of estrogen. The healthy body employs many different detoxification pathways, in the liver and elsewhere, of which glucuronidation is one. Glucuronidation removes several toxic and potentially toxic chemicals from our system, such as polycyclic aromatic hydrocarbons, steroid hormones, some nitrosamines, heterocyclic amines, some fungal toxins, and aromatic amines. It also removes "used" hormones, such as estrogen and T4, that are produced naturally by the body. This, glucuronidation represents a major means of converting most drugs, steroids, and many toxic and endogenous substances to metabolites that can then be excreted into the urine or bile.

The liver, spleen, and gut may be damaged or otherwise impaired by several means:

• Liver disease or disorder, such as hepatitis

• Drugs or toxic exposure disrupts phase 1 or phase 2 function

• Accidental ingestion of toxic substances (such as plants, poisons, drug overdose, mercury)

• Intentional ingestion of substances which overload detox pathways (such as nicotine, acetaminophen, NSAIDs, xenobiotics, therapeutic glycosides, etc.

Many of these toxic and otherwise therapeutic substances (xenobiotics, drugs) disrupt the glucuronidation by impairing it, stopping it, or causing the binds to be rupture, separating the bound molecules from its inert transport. The toxins that are thus not removed by normal binding and excretion may settle elsewhere in the body, causing tumors and other signs of toxicity.

Glucuronidase is an enzyme that inhibits the glucuronidation process, breaking apart the bound toxins. Calcium D-glucarate (a calcium salt that is found in some plants, such as apples, grapefruit, broccoli and alfalfa) suppresses that enzyme, restoring this particular detoxification pathway.

Note: acetaminophen also affects the glutathione detox pathway in the liver, so those taking acetaminophen products should also take a glutathione supplement.

Selected references:

Amdur MO, Doull J, Klassen CD, Casarett and Doull's Toxicology: The Basic Science of Poisons, 4th ed., Mcgraw-Hill, New York, 1991.

Chang, K. M.; McManus, K.; Greene, J.; Byrd, G. D.; DeBethizy, J. D. (1991) Glucuronidation as a metabolic pathway for nicotine metabolism. Toxicologist :48

Coffman B.L., King C.D., Rios G.R. and Tephly T.R. The glucuronidation of opioids, other xenobiotics, and androgens by human UGT2B7Y(268) and UGT2B7H(268). Drug Metab. Dispos. 26:73-77, 1998.

Dwivedi C, Heck WJ, Downie AA, Larroya S, Webb TE, Effect of calcium glucarate on beta-gluconidase activity and glucarate content of certain vegetables and fruits. Biochemical Medicine and Metabolic Biology. 43(2):83-92, 1990.

Heerdt AS, Young CW, Borgen PI, Calcium glucarate as a chemopreventive agent in breast cancer. Israel Journal of Medical Sciences. 31(2-3):101-5, 1995.

Walaszek Z, Hanausek-Walaszek M, Minto JP, Webb TE, Dietary glucarate as anti-promoter of 7, 12-dimethylbenz[a]anthracene-induced mammary tumorigenesis. Carcinogenesis. 7(9):1463-6, 1986.

Walaszek Z, Potential use of D-glucaric acid derivatives in cancer prevention. Cancer Letters. 54(1-2):1-8, 1990.