Safety evaluation of Eucommia ulmoides extract

Area of Science:

• Pharmacology
• Toxicology
• Traditional Chinese Medicine

Background:

• Eucommia ulmoides Oliver, a plant native to China, is a staple in traditional Chinese medicine.
• Concerns exist regarding the potential genotoxic and nephrotoxic effects of Eucommia ulmoides extract (EUE).

Purpose of the Study:

• To comprehensively evaluate the safety profile of Eucommia ulmoides extract (EUE).
• To assess the genotoxicity, acute toxicity, and sub-chronic toxicity of EUE.

Main Methods:

• Genotoxicity was assessed using the Ames test, bone marrow micronucleus assay, and chromosomal aberration assay.
• Acute toxicity was determined by evaluating effects after 24 hours, and sub-chronic toxicity was assessed over 13 weeks.
• Dose-dependent effects on kidney function and renal tissues were analyzed.

Main Results:

• Eucommia ulmoides extract (EUE) demonstrated non-genotoxic properties across tested concentrations.
• The maximum tolerated dose of EUE was found to be at least 168 g/kg body weight, significantly exceeding clinical dosages.
• Sub-chronic administration revealed dose-dependent increases in nephrotoxicity markers and renal tissue pathology, which were partially reversible upon cessation of low-dose EUE.

Conclusions:

• Eucommia ulmoides extract (EUE) is non-genotoxic and does not induce acute toxicity.
• Long-term, high-dose exposure to EUE can result in dose-dependent, partly reversible nephrotoxicity.
• Further research into safe EUE dosage and administration protocols is warranted for its medicinal applications.