The influence of oxygen and hydrostatic pressure on articular chondrocytes and adherent bone marrow cells in vitro.
Tissue engineering of articular cartilage from chondrocytes or stem cells is considered to be a potential aspect in the treatment of cartilage defects. In order to optimize culture conditions the influence of low oxygen tension (5%) - single or in combination with intermittent hydrostatic pressure (HP: 30/2 min on/off loading; 0.2 MPa) - on the biosynthetic activity (sulfate and proline incorporation) of human osteoarthritic chondrocytes cultured on collagen I/III membranes was investigated. Additionally, chondrogenesis from high density or monolayer cultures of bovine adherent bone marrow cells (aBMC) with and without chondrogenic medium supplements (CM) was analyzed by RT-PCR (mRNA expression of aggrecan and collagen type II). We could show that low oxygen tension increases significantly the biosynthesis of collagen I/III membrane-associated chondrocytes and even higher under co-stimulation with HP. While there is no chondrogenesis in monolayer cultures, CM induces expression of cartilage matrix molecules in high density cultures of aBMC which is even increased under the influence of low oxygen tension. Both, low oxygen tension and HP without CM are alone not sufficient stimuli for chondrogenesis. It can be concluded that low oxygen tension and HP might be useful tools in cartilage tissue engineering and that these physico-chemical factors promote but do not induce chondrogenesis under the given conditions.
Anatomisches Institut, CAU zu Kiel, Olshausenstr. 40, D-24098 Kiel, Germany.
Katrin
K
Scherer
Michael
M
Schünke
Roland
R
Sellckau
Joachim
J
Hassenpflug
Bodo
B
Kurz
D000818:Animals; D001854:Bone Marrow Cells / Q000378:metabolism; D002358:Cartilage, Articular; D002417:Cattle; D002448:Cell Adhesion; D002478:Cells, Cultured; D019902:Chondrocytes / Q000378:metabolism*; D024042:Collagen Type I / Q000378:metabolism; D024061:Collagen Type III / Q000378:metabolism; D006801:Humans; D006874:Hydrostatic Pressure; D010003:Osteoarthritis / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D011392:Proline / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013431:Sulfates / Q000378:metabolism; D023822:Tissue Engineering / Q000379:methods
D024042:Collagen Type I; D024061:Collagen Type III; D013431:Sulfates; D011392:Proline; D010100:Oxygen