Screening of superior anti‐osteoporotic flavonoids from Epimedii Folium with dual effects of reversing iron overload and promoting osteogenesis

Abstract

Iron overload is a risk factor for postmenopausal osteoporosis (PMOP) and lowering iron levels to regulate the labile plasma iron is the preferred therapy. Icariin (ICA), baohuoside I (BHS) and icaritin (ICT) are three flavonoids obtained from Epimedii Folium that are efficient in facilitating osteogenesis. In this study, an active flavonoid with dual effects of reversing iron overload and promoting osteogenesis was screened based on pharmacokinetics, iron complexation properties and the potential to downregulate iron overload, reversing PMOP. As a result, the in vivo absorption of three compounds was ICA > ICT > BHS, while the exposure in muscle and bone was BHS > ICT > ICA. In vitro complexation showed that only ICT complexed with Fe (III) at a 1:1 ratio on 3‐OH and the ICT–Fe (III) complex (m/z 424.3750) was identified by UPLC–Q‐TOF–MS. In vivo dynamic detection also showed that the concentration of ICT–Fe (III) complexes varied with the concentration of ICT in plasma. The behavioral blunting and bone loss in zebrafish induced by Fe (III) were significantly reversed by ICT in a dose‐dependent manner. Pharmacokinetic–pharmacodynamic analysis showed that ICT was negatively correlated with serum ferritin and positively correlated with osteogenic markers including alkaline phosphatase, osteocalcin and osteoprotegerin. Bone loss in ovariectomized rats was significantly altered after ICT intervention, with reduced serum ferritin levels and improved osteogenic marker levels. These results demonstrated that ICT had favorable musculoskeletal penetration and iron complexation capability to shrink labile plasma iron, showing superior performance in anti‐PMOP through the dual effects of reversing iron overload and promoting osteogenesis.

Targeting bone homeostasis regulation: potential of traditional Chinese medicine flavonoids in the treatment of osteoporosis

“…plant, has adequate musculoskeletal permeability and iron complexing properties. It can also utilize unstable plasma iron to construct artificial iron pools that would re verse the iron overload and promote osteogenesis ( Jiang J. et al, 2023 ). Icaritin was hypothesized to act as a potential natural phytochelator in this experiment.…”

Enhancement of Icariin Aphrodisiac Effect by Solid-SNEDDS Method Using Shark Liver Oil Phase

“…The determination of turbidity is carried out using the results of emulsification time. The emulsion that has been obtained is measured absorption using a UV-VIS spectrophotometer at a wavelength of 650 nm with an aquadest blank (28).…”