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The dirty side of soap

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Triclosan is an antimicrobial additive found in many liquid hand soaps and other household products.

Long-term exposure to triclosan, an antimicrobial agent commonly found in a broad array of soaps, shampoos, toothpastes and other consumer products, may have potentially serious health consequences, reports a team of researchers from UC Davis and UC San Diego. The study, published Nov. 17 by Proceedings of the National Academy of Sciences, shows that triclosan causes liver fibrosis and cancer in laboratory mice through molecular mechanisms that are also relevant in humans.

“Triclosan’s increasing detection in environmental samples and its increasingly broad use in consumer products may overcome its moderate benefit and present a very real risk of liver toxicity for people, as it does in mice, particularly when combined with other compounds with similar action,” said Robert H. Tukey, Ph.D., professor in the departments of Chemistry and Biochemistry and Pharmacology at UC San Diego. Tukey led the study, together with Bruce D. Hammock, Ph.D., a professor in the Department of Entomology and Nematology, and at the Comprehensive Cancer Center at UC Davis. Both Tukey and Hammock are directors of National Institute of Environmental Health Sciences (NIEHS) Superfund Programs at their respective campuses.

Tukey, Hammock and their teams, including Mei-Fei Yueh, Ph.D., found that triclosan disrupted liver integrity and compromised liver function in mouse models. Mice exposed to triclosan for six months (roughly equivalent to 18 human years) were more susceptible to chemical-induced liver tumors. Their tumors were also larger and more frequent than in mice not exposed to triclosan.

The study suggests triclosan may do its damage by interfering with the constitutive androstane receptor, a protein responsible for detoxifying (clearing away) foreign chemicals in the body. To compensate for this stress, liver cells proliferate and turn fibrotic over time. Repeated triclosan exposure and continued liver fibrosis eventually promote tumor formation.

Triclosan is perhaps the most ubiquitous consumer antibacterial. Studies have found traces in 97 percent of breast milk samples from lactating women and in the urine of nearly 75 percent of people tested. Triclosan is also common in the environment: It is one of the seven most frequently detected compounds in streams across the United States.

“We could reduce most human and environmental exposures by eliminating uses of triclosan that are high volume, but of low benefit, such as inclusion in liquid hand soaps,” Hammock said. “Yet we could also for now retain uses shown to have health value — as in toothpaste, where the amount used is small.”

Triclosan is already under scrutiny by the FDA, thanks to its widespread use and recent reports that it can disrupt hormones and impair muscle contraction.

Co-authors include Koji Taniguchi, Shujuan Chen and Michael Karin, UC San Diego; and Ronald M. Evans, Salk Institute for Biological Studies.

This research was funded, in part, by U.S. Public Health Service grants ES010337, GM086713, GM100481, A1043477, ES002710 and ES004699.