MEDLINE Journals

    Intermittent hydrostatic pressure inhibits shear stress-induced nitric oxide release in human osteoarthritic chondrocytes in vitro.

    Authors
    Lee MS, Trindade MC, Ikenoue T, et al. 
    Institution

    Orthopaedic Research Laboratory and the Division of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, USA.

    Source
    J Rheumatol 2003 Feb; 30(2) :326-8.
    Abstract

    To test the effects of intermittent hydrostatic pressure (IHP) on nitric oxide (NO) release induced by shear stress and matrix macromolecule gene expression in human osteoarthritic chondrocytes in vitro.Chondrocytes isolated from cartilage samples from 9 patients with osteoarthritis were cultured and exposed to either shear stress or an NO donor. Nitrite concentration was measured using the Griess reaction. Matrix macromolecule mRNA signal levels were determined using reverse-transcriptase polymerase chain reaction and quantified by imaging analysis software.Exposure to shear stress upregulated NO release in a dose and time-dependent manner. Application of IHP inhibited shear stress induced NO release but did not alter NO release from chondrocytes not exposed to shear stress. Shear stress induced NO or addition of an NO donor (sodium nitroprusside) was associated with decreased mRNA signal levels for the cartilage matrix proteins, aggrecan, and type II collagen. Intermittent hydrostatic pressure blocked the inhibitory effects of sodium nitroprusside but did not alter the inhibitory effects of shear stress on cartilage macromolecule gene expression.Our data show that shear stress and IHP differentially alter chondrocyte metabolism and suggest that a balance of effects between different loading forces preserve cartilage extracellular matrix in vivo.

    Mesh
    Aggrecans
    Cells, Cultured
    Chondrocytes
    Collagen
    Extracellular Matrix Proteins
    Humans
    Hydrostatic Pressure
    Lectins, C-Type
    Nitric Oxide
    Nitric Oxide Donors
    Nitroprusside
    Osteoarthritis
    Proteoglycans
    RNA, Messenger
    Stress, Mechanical
    Language

    eng

    Pub Type(s)
    In Vitro Journal Article Research Support, U.S. Gov't, P.H.S.
    PubMed ID

    12563690

    Content Manager
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