Mammalian phytoestrogens: enterodiol and enterolactone.

Area of Science:

• Biochemistry
• Microbiology
• Oncology

Background:

• Mammalian lignans enterodiol (END) and enterolactone (ENL) are gut microbial metabolites of dietary plant precursors.
• These compounds exhibit weak estrogenic and antiestrogenic activities.
• High endogenous production of these lignans is hypothesized to offer protection against hormone-related cancers.

Purpose of the Study:

• To review the chemistry, quantitative analysis, biological properties, and health effects of END and ENL.
• To explore the potential role of END and ENL in cancer prevention.

Main Methods:

• Literature review of existing studies on END and ENL.
• Analysis of in vitro experimental data regarding cancer cell growth inhibition.
• Examination of proposed mechanisms of action for lignan-mediated protection.

Main Results:

• In vitro studies indicate END and ENL inhibit human colon tumor cell growth.
• Enterolactone (ENL) demonstrated inhibition of E2-induced proliferation in MCF-7 breast cancer cells.
• Potential mechanisms include competition with estrogen for type II estrogen receptors, induction of SHBG, placental aromatase inhibition, and antioxidant activity.

Conclusions:

• Gut microbial production of END and ENL from dietary precursors may contribute to cancer chemoprevention.
• Further research into the biological properties and health effects of these mammalian lignans is warranted.