Metabolomics comparison of chemical components and metabolic regulations in different parts of Eucommia ulmoides Oliv

Eucommia ulmoides Oliv. (EU) is an herb with variety of pharmacological activities. As the demand for EU as a medical source increases, its limited availability is becoming an urgent problem. The bark of EU— Eucommia cortex (EC)—was the main medicinal part of EU, whose yield has been too low to meet market requirements. The EU leaves— Eucommiae folium (EF)—obtained easily from the trees, traditionally considered less valuable than the EU bark. This study compared chemical components and metabolic regulations in different parts of EU using metabolomics to explore the potential for alternative medical sources of EU. The results demonstrated that the composition of EC differs slightly from the composition of EF, and there are some differences in the content of individual ingredients between EC and EF. Combined pharmacodynamic/metabolomics analysis showed that both EC and EF could improve the bone metabolism markers and trabecular microarchitecture of ovariectomized rats mainly by intervening in amino acid metabolism. Our data suggest that EF is a potential alternative medicinal option when EU resources are scarce, and this study provides a mechanistic framework for the benefits of EF in osteoporosis disease.