Type

Journal Article

Authors

Daniel J Kelly
Conor T Buckley
Eamon J Sheehy

Subjects

Biochemistry

Topics
cell differentiation swine physiology partial pressure glucosaminoglycans cytology cell culture techniques animals osteogenesis cell proliferation mesenchymal stromal cells chondrogenesis tissue engineering bone marrow cells glycosaminoglycans oxygen

Oxygen tension regulates the osteogenic, chondrogenic and endochondral phenotype of bone marrow derived mesenchymal stem cells. (2011)

Abstract The local oxygen tension is a key regulator of the fate of mesenchymal stem cells (MSCs). The objective of this study was to investigate the effect of a low oxygen tension during expansion and differentiation on the proliferation kinetics as well as the subsequent osteogenic and chondrogenic potential of MSCs. We first hypothesised that expansion in a low oxygen tension (5% pO(2)) would improve both the subsequent osteogenic and chondrogenic potential of MSCs compared to expansion in a normoxic environment (20% pO(2)). Furthermore, we hypothesised that chondrogenic differentiation in a low oxygen environment would suppress hypertrophy of MSCs cultured in both pellets and hydrogels used in tissue engineering strategies. MSCs expanded at 5% pO(2) proliferated faster forming larger colonies, resulting in higher cell yields. Expansion at 5% pO(2) also enhanced subsequent osteogenesis of MSCs, whereas differentiation at 5% pO(2) was found to be a more potent promoter of chondrogenesis than expansion at 5% pO(2). Greater collagen accumulation, and more intense staining for collagen types I and X, was observed in pellets maintained at 20% pO(2) compared to 5% pO(2). Both pellets and hydrogels stained more intensely for type II collagen when undergoing chondrogenesis in a low oxygen environment. Differentiation at 5% pO(2) also appeared to inhibit hypertrophy in both pellets and hydrogels, as demonstrated by reduced collagen type X and Alizarin Red staining and alkaline phosphatase activity. This study demonstrates that the local oxygen environment can be manipulated in vitro to either stabilise a chondrogenic phenotype for use in cartilage repair therapies or to promote hypertrophy of cartilaginous grafts for endochondral bone repair strategies.
Collections Ireland -> Trinity College Dublin -> PubMed

Full list of authors on original publication

Daniel J Kelly, Conor T Buckley, Eamon J Sheehy

Experts in our system

1
Daniel Kelly
Trinity College Dublin
Total Publications: 168
 
2
Conor T Buckley
Trinity College Dublin
Total Publications: 85
 
3
Eamon J Sheehy
Trinity College Dublin
Total Publications: 8