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Decrease in fibronectin occurs coincident with the increased expression of its integrin receptor alpha5beta1 in

S S AbiEzzi, R A Foulk, F L Harwood

    The Iowa Orthopaedic Journal
    |January 1, 1997
    PubMed
    Summary

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    Immobilization weakens ligaments by altering collagen and fibronectin (Fn). Stress deprivation increases integrin receptors in fibroblasts, suggesting a role in tissue remodeling and potential degradation.

    Area of Science:

    • Biomedical Engineering
    • Orthopedic Research
    • Cellular Biology

    Background:

    • Immobilization causes stress deprivation, leading to atrophic changes in soft tissues.
    • Ligament changes include collagen disorganization and ultrastructural alterations, resulting in functional weakness.

    Purpose of the Study:

    • To investigate fibronectin (Fn) and alpha5beta1 integrin receptor expression in stress-deprived knee ligaments.
    • To understand the role of these components in extracellular matrix remodeling during immobilization.

    Main Methods:

    • Surgical immobilization of rabbit knees in acute flexion.
    • Immunostaining of anterior cruciate ligaments (ACLs) and medial collateral ligaments (MCLs) for integrin subunits.
    • Competitive ELISA to measure Fn concentration in ligaments.

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    Main Results:

    • Increased immunostaining for beta1 and alpha5 integrin subunits in immobilized ACLs and MCLs.
    • Significant decreases in Fn concentration in ACLs (54.0-63.7%) and MCLs (37.7-41.7%) after 9-12 weeks of immobilization.
    • Differential impact of stress deprivation on Fn levels between ACL and MCL.

    Conclusions:

    • The Fn-specific integrin receptor alpha5beta1 plays a key role in remodeling stress-deprived ligamentous tissue.
    • Maintaining normal stress on ligaments is crucial to prevent extracellular matrix degradation, including Fn.