Comparative proteomic analysis of hMSC behaviour on calcium phosphate ceramics with different osteoinductive potential

The extent of adsorption was suggested to be affected by the available surface area for binding and by the ion exchange dynamics on the surface. Several proteins were uniquely expressed by hMSCs on TCP and HA surfaces. Proteins identified as enriched on TCP were involved in processes related to wound healing, cell proliferation and the production of extracellular matrix.

On the other hand, proteins that were enriched on HA were involved in processes related to protein production, translation, localization and secretion. In addition, we performed a separate proteomics analysis on TCP, HA, and two biphasic calcium phosphates (BCP) with known osteoinductive potential and performed a clustering analysis on a combination of a set of proteins found to be enriched on osteoinductive materials with a set of proteins already known to be involved in osteogenesis.

This yielded two protein networks potentially involved in the process of osteoinduction- one consisting of collagen fragments and collagen-related enzymes, and a second consisting of endopeptidase inhibitors and regulatory proteins. The results of this study show that protein profiling can be a useful tool to help understand the effect of biomaterials properties on the interactions between a biomaterial and a biological system.

Such understanding will contribute to the design and development of improved biomaterials for (bone) regenerative therapies.