The Influence of PTH 1-34 on the Osteogenic Characteristics of Adipose and Bone Marrow Derived Stem Cells from Juvenile and Ovarectomized Rats

Abstract Background: Mesenchymal Stem Cells (MSCs) are of growing interest in terms of bone regeneration; the majority of preclinical trials utilise bone marrow derived stem cells (bMSCs), though this is not without isolation and expansion difficulties Objective: We compare the characteristics of bone marrow and adipose derived cells from juvenile, adult and ovarectomized rats; also assessing the effect of hPTH 1-34, on their osteogenic potential. Methods: cells were isolated from the adipose and bone marrow of juvenile, adult and previously ovarectomized wistar rats. Cells were characterised with flowcytometery, proliferation assays, osteogenic and adipogenic differentiation, and migration to SDF-1. Experiments were repeated with and without co-culturing with 50nMol of intermittent PTH 1-34. Results: The juvenile and adult MSCs demonstrated significantly increased differentiation into bone and fat and superior migration towards SDF-1 than ovarectomized groups, this was the case for adipose and bone marrow derived cells equally. PTH increased parameters of osteogenic differentiation and migration to SDF-1, this was significant for all cell types, though had the most significant effect on cells derived from OVX animals. Bone marrow derived cells from all groups, showed increased mineralisation and migration to SDF-1 compared to adipose derived cells. Conclusion: Juvenile MSCs showed significantly greater migration to SDF-1 and showed greater osteogenic and adipogenic differentiation compared to cells from osteopenic rats, this was true for bone marrow and adipose derived cells. The addition of PTH, increased the osteogenic characteristics and migration of all cells, and further illustrates the possible clinical utility of both PTH and MSCs from various sources in bone regenerative therapies