Gene expression profiles in chondrosarcoma cells subjected to cyclic stretching and hydrostatic pressure. A cDNA array study

Issue title: Selected papers of the Euromech Colloquium No. 420, Mechanobiology of Cells and Tissues

Article type: Research Article

Authors: Karjalainen, Hannu M.^; | Sironen, Reijo K.^; | Elo, Mika A. | Kaarniranta, Kai | Takigawa, Masaharu | Helminen, Heikki J. | Lammi, Mikko J.^;

Affiliations: Department of Anatomy, University of Kuopio, P.O. Box 1627, 70211 Kuopio, Finland | Department of Biochemistry and Molecular Dentistry, Okayama University Graduate School of Medicine and Dentistry, Okayama 700‐8525, Japan

Note: [] H.M.K. and R.K.S. contributed equally to this work.

Note: [] H.M.K. and R.K.S. contributed equally to this work.

Note: [] Address for correspondence: Mikko Lammi, Department of Anatomy, University of Kuopio, P.O. Box 1627, 70211 Kuopio, Finland. Tel.: +358 17 163 027; Fax: +358 17 163 032; E‐mail: [email protected].

Abstract: Mechanical forces have a profound effect on cartilage tissue and chondrocyte metabolism. Strenuous loading inhibits the cellular metabolism, while optimal level of loading at correct frequency raises an anabolic response in chondrocytes. In this study, we used Atlas Human Cancer cDNA array to investigate mRNA expression profiles in human chondrosarcoma cells stretched 8% for 6 hours at a frequency of 0.5 Hz. In addition, cultures were exposed to continuous and cyclic (0.5 Hz) 5 MPa hydrostatic pressure. Cyclic stretch had a more profound effect on the gene expression profiles than 5 MPa hydrostatic pressure. Several genes involved with the regulation of cell cycle were increased in stretched cells, as well as mRNAs for PDGF‐B, glucose‐1‐phosphate uridylyltransferase, Tiam1, cdc37 homolog, Gem, integrin α6, and matrix metalloproteinase‐3. Among down‐regulated genes were plakoglobin, TGF‐α, retinoic acid receptor‐α and Wnt8b. A smaller number of changes was detected after pressure treatments. Plakoglobin was increased under cyclic and continuous 5 MPa hydrostatic pressure, while mitogen‐activated protein kinase‐9, proliferating cell nuclear antigen, Rad6, CD9 antigen, integrins αE and β8, and vimentin were decreased. Cyclic and continuous pressurization induces a number of specific changes. In conclusion, a different set of genes were affected by three different types of mechanical stimuli applied on chondrosarcoma cells.

Journal: Biorheology, vol. 40, no. 1-3, pp. 93-100, 2003