HYALURONIC ACID/BONE SUBSTITUTE COMPLEX IMPLANTED ON CHICK EMBRYO CHORIOALLANTOIC MEMBRANE INDUCES OSTEOBLASTIC DIFFERENTIATION AND ANGIOGENESIS, BUT NOT INFLAMMATION

The combination of hyaluronic acid and equine derived bone granules induces osteoblastic differentiation in a chick embryo chorioallantoic membrane model

Microscopic and molecular events related to alveolar ridge augmentation are less known because of the lack of experimental models and limited molecular markers used to evaluate this process. We propose here the chick embryo chorioallantoic membrane (CAM) as an in vivo model to study the interaction between CAM and bone substitutes (B) combined with hyaluronic acid (BH), saline solution (BHS and BS, respectively), or both, aiming to point out the microscopic and molecular events assessed by Runt-related transcription factor 2 (RUNX 2), osteonectin (SPARC), and Bone Morphogenic Protein 4 (BMP4). The BH complex induced osteoprogenitor and osteoblastic differentiation of CAM mesenchymal cells, certified by the RUNX2 +, BMP4 +, and SPARC + phenotypes capable of bone matrix synthesis and mineralization. A strong angiogenic response without inflammation was detected on microscopic specimens of the BH. A multilayered organization of the BH complex grafted on CAM was detected with a differential expression of RUNX2, BMP4, and SPARC. The BH complex induced CAM mesenchymal cells differentiation through osteoblastic lineage with a sustained angiogenic response not related with inflammation.  The CAM model allows us to assess the early events of the bone substitutes(-)mesenchymal cells interaction related to osteoblastic differentiation, an important step in alveolar ridge augmentation.

PRODUCTS USED: Bio-Gen Granules Mix