title: Compression and tension: differential effects on matrix accumulation by periodontal ligament fibroblasts in vitro.
abstract: Human periodontal ligament fibroblasts were subjected to 10% cyclic equibiaxial tensional and compressive forces in vitro. Media supernatants were analyzed for changes in total protein, extracellular matrix proteins type I collagen and fibronectin, as well as MMP expression by gelatin zymography and Western blot. RNA analyses for changes in collagen, MMP-2, and TIMP-2 were carried out by either Real-time PCR and/or Northern blot. Application of compressional forces resulted in decreases in type I collagen and fibronectin protein, Col1A1 RNA, and increases in total protein, MMP-2 protein (latent and active), and MMP-2 RNA. TIMP-2 RNA was unchanged by compressive forces. In contrast, tensional forces increased total protein, type I collagen, Col1A1 RNA, as well as MMP-2 and TIMP-2 RNA. These studies show that cells can perceive two different forms of mechanical stimuli and respond in a differential manner relative to extracellular matrix synthesis and degradation.
authors.affiliation: Department of Anatomy and Cell Biology, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6030, USA.
authors.forename: Yuling
authors.initials: Y
authors.lastname: He
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Macarak
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Korostoff
authors.forename: Pamela S
authors.initials: PS
authors.lastname: Howard
mesh_terms: D015152:Blotting, Northern; D002478:Cells, Cultured; D024042:Collagen Type I / Q000378:metabolism; D000090602:Collagen Type I, alpha 1 Chain; D003199:Computer Systems; D004867:Equipment Design; D016326:Extracellular Matrix Proteins / Q000235:genetics / Q000378:metabolism*; D005347:Fibroblasts / Q000378:metabolism*; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000378:metabolism; D006801:Humans; D020782:Matrix Metalloproteinases / Q000235:genetics / Q000378:metabolism; D010513:Periodontal Ligament / Q000166:cytology / Q000378:metabolism / Q000502:physiology*; D016133:Polymerase Chain Reaction; D011312:Pressure; D012313:RNA / Q000378:metabolism; D013314:Stress, Mechanical; D019714:Tissue Inhibitor of Metalloproteinases / Q000235:genetics / Q000378:metabolism
chemical_list: D024042:Collagen Type I; D000090602:Collagen Type I, alpha 1 Chain; D016326:Extracellular Matrix Proteins; D019714:Tissue Inhibitor of Metalloproteinases; D012313:RNA; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases; D020782:Matrix Metalloproteinases