Evaluation of Osteogenesis and Angiogenesis of Icariin Loaded on Micro-nano Hybrid Structured Hydroxyapatite Granules as a Local Drug Delivery System for Feromal Defect Repair

Icariin has been identified to promote osteogenic differentiation of bone mesenchymal stem cells (BMSCs). However, whether icariin could enhance angiogenic factor expression of BMSCs, which may be vital for bone repair need to be explored. Moreover, how to construct a delivery system of icariin and the repair capability in the bone defect is still unknown. In present study, the effects of icariin on the osteogenic differentiation and angiogenic factor expression of BMSCs were firstly evaluated. Moreover, new micro-nano hybrid structured HAp (micro-nano HAp) granules were fabricated to construct the delivery system of icariin, and the osteogenesis and angiogenesis of icariin loaded on micro-nano HAp granules in rat femoral plug defect model was evaluated by micro-CT measurement, sequential fluorescent labeling and histeological assay. The in vitro results showed that icariin significantly improved osteogenic differentiation of rat BMSCs was demonstrated by the enhanced alkaline phosphatase (ALP) activity and gene expression of runt-related transcription factor-2 (Runx2), ALP, collagen type I (Col I), osteocalcin (OCN) and OCN protein secretion. Moreover, icariin induced the angiogenic genes expression of BMSCs, such as vascular endothelial growth factor (VEGF) and angiotensin 1 (ANG1). Furthermore, the activation in AKT signaling pathways was observed in BMSCs by the treatment of icariin, and these enhancement effects could be blocked by LY294002, which suggested that AKT signaling pathway was involved in the osteogenic differentiation and angiogenic factor expression of BMSCs induced by icariin. More importantly, micro-nano HAp granules with rod-like shape were successfully fabricated and acted as delivery carrier for icariin. Consequently, icariin loaded on micro-nano HAp granules could promote new bone formation and blood vessel formation. These results demonstrated that icariin could enhance osteogenic differentiation and angiogenic factor expression of BMSCs via AKT signaling pathway, moreover, the novel micro-nano HAp granules could act as carrier for icariin to repair bone defect via enhancing osteogenesis and angiogenesis.