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  • 1.
    Ebrahimzadeh, PR
    et al.
    Department of Anatomy and Cell Biology, Göteborg University, Sweden.
    Bazargani, F
    Afzal, F
    Hogfors, C
    Braide, M
    A subpopulation analysis of f-MLP stimulated granulocytes migrating in filters1996Inngår i: Biorheology, ISSN 0006-355X, E-ISSN 1878-5034, Vol. 33, nr 3, s. 231-250Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Leukocyte migration in vitro has been studied extensively during many years without providing satisfactory theoretical models for the different migratory behaviors (chemotaxis and chemokinesis) of leukocyte populations, The present study utilized the fluid gradient chamber, which is a new method to study leukocyte migration in filters, Human neutrophils were applied between two stacked filters and migrated in all directions under the influence of constant concentrations or chemotactic gradients of f-MLP, maintained in fluid phase density gradients. The distributions of the granulocytes over filter depth were fitted to theoretical functions composed by 1-3 Gaussian distributions, representing subpopulations, The results showed that the neutrophils migrated as two discrete subpopulations during chemokinetic stimulation (a constant concentration of f-MLP), One of the subpopulations showed less active and passive (slow sedimentation under the influence of gravity) translocation. The most mobile subpopulation was divided into two new subpopulations when exposed to chemotactic stimulation (concentration gradient of f-MLP), one of which responded chemotactically and one of which migrated in random directions, The properties of the different subpopulations where characterized in terms of diffusion coefficient (random migration), convection velocity (chemotactic migration) and sedimentation coefficient (passive translocation).

  • 2. Ebrahimzadeh, PR
    et al.
    Braide, M
    Strid, KG
    Bjursten, LM
    MIGRATION OF HUMAN GRANULOCYTES IN FILTERS - EFFECTS OF GRAVITY AND MOVABLE GRADIENTS OF F-MLP1994Inngår i: Biorheology, ISSN 0006-355X, E-ISSN 1878-5034, Vol. 31, nr 6, s. 617-630Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Boyden chamber technique for chemotaxis uses a mesh filter that constitutes a matrix for cell locomotion and, at the same time, creates a local restriction for convective fluid movements that allows the establishment of a diffusive concentration gradient of chemotactic substance in the filter. In the present study, the Boyden chamber was modified by the introduction of a filter sandwich that allowed cell migration both upwards and downwards and by the use of a fluid density gradient controlling cell buoyancy and mechanically supporting a movable chemotactic gradient, This method was used to study chemotaxis and random migration of human granulocytes under the influence of gravitational forces and movable gradients of f-MLP. The results show that gravity affected cell motion significantly during random migration but not during chemotaxis, The rate of chemotactic migration was dependent on the steepness of the spatio-temporal f-MLP gradients, A stationary spatial gradient produced less migration than a gradient that was slowly moved through the filter sandwich in a direction opposite to that of the The presence of f-MLP at constant concentration caused a minor, statistically insignificant, increase of the rate of random migration.

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