Anti-FZD9 (extracellular domain) polyclonal antibody

Background: Endothelial-mesenchymal transition (EndMT) is a complex process whereby differentiated endothelial cells undergo phenotypic transition to mesenchymal cells. EndMT can be stimulated by several factors and the most common are the transforming growth factor-beta (TGF-beta) and SNAIL transcription factor. Given the diversity of the vascular system, it is unclear whether endothelial cells lining different vessels are able to undergo EndMT through the same mechanisms. Here we evaluate the molecular and functional changes that occur in different types of endothelial cells following induction of EndMT by overexpression of SNAIL and TGF-beta 2. Results: We found that responses to induction by SNAIL are determined by cell origin and marker expression. Human coronary endothelial cells (HCAECs) showed the greatest EndMT responses evidenced by significant reciprocal changes in the expression of mesenchymal and endothelial markers, effects that were potentiated by a combination of SNAIL and TGF-132. Key molecular events associated with EndMT driven by SNAIL/TGF-beta 2 involved extracellular-matrix remodeling and inflammation (IL-8, IL-12, IGF-1, and TREM-1 signaling). Notch signaling pathway members DLL4, NOTCH3 and NOTCH4 as well as members of the Wnt signaling pathway FZD2, FZD9, and WNT5B were altered in the combination treatment strategy, implicating Notch and Wnt signaling pathways in the induction process. Conclusion: Our results provide a foundation for understanding the roles of specific signaling pathways in mediating EndMT in endothelial cells from different anatomical origins.

Hyperlipidemia inhibits bone formation, which has an adverse impact on the success of dental implants. Fzd9 has been reported to be a positive regulator of osteogenesis. However, the role of Fzd9 in dental implants in hyperlipidemic conditions is still unknown. In current study, we investigated how Fzd9 impacts on implant osseointegration in hyperlipidemic conditions. Models of high-fat medium-stimulated rat bone marrow stromal stem cells (BMSCs) were established. Alkaline phosphatase (ALP), alizarin red S (ARS) and oil red O (ORO) staining were used to examine the osteogenic differentiation of BMSCs. Wistar rats were fed with high-fat diet to induced hyperlipidemia. Titanium implants were implanted into the proximal metaphysic of the bilateral femurs of rats after 8 weeks. Thereafter, 1 mm of bone around each implant was obtained. Implant osseointegration and micromorphology were analyzed with microcomputer tomography (micro-CT) and hematoxylin-eosin(HE) staining. The relative expression levels of Fzd9 and Runx2 were analyzed by quantitative real-time PCR in vitro and in vivo. Western blotting was used to analyzed the protein level of Fzd9. The expression levels of Fzd9 and Runx2 were decreased. Osteogenic differentiation of BMSCs were suppressed under high-fat medium. Less bone formation was observed in hyperlipidemic rats compared to the normal. Hyperlipidemic rats had lower osteoblasts and bone-implant combination (BIC), bone volume fraction (BV/TV), trabecular thickness (Tb.Th), trabecular number (Tb.N) but higher trabecular spacing (Tb.S), trabecular bone pattern factor (TM) and osteoclasts. In conclusion, the lower expression of Fzd9 impairs osseointegration in hyperlipidemic conditions via Wnt signaling pathway-related Runx2. Fzd9 may serve as a promising strategy for hyperlipidemia osseointegration.