Actin microfilaments dynamics in African green monkey renal cell line (Vero) during cultivation

The structure of the actinic cytoskeleton in Vero cells (African green monkey kidney cells) during monolayer formation was studied. By immunofluorescence after phalloidin staining, actin was visualized in cells 15 min, 2, 4, 24 and 48 hours after cultivation. The evolution in time of cells revealed the progressive organization of actin molecules from diffuse granular forms to filamentous forms with characteristic patterns. The evolution of actinic cytoskeletal elements was closely correlated with the evolution of the cell shape and the extension of intercellular contact surfaces.

Effect of prostaglandin E2 (PGE2) and cyclic adenosine monophosphate (cAMP) upon actin cytoskeleton in human pulmonary fibroblasts (ICP-23) infected by measles virus

The evolution of the actin cytoskeleton after trypsinization and recultivation as well as the effect of the PGE2 modulator and that of the secondary messenger, the cyclic AMP upon the same cytoskeletal proteins in human pulmonary fibroblasts (ICP-23) were studied. The substances were administered simultaneously and after one hour of viral adsorption. Using epifluorescence for pointing out filamentous actin the modifications occurring in this cytoskeletal protein when contacting trypsin and the virus and when PGE2 and cAMP are administered in the experimental variants are observed. Actin arrangement is obviously modified by the viral infection but the restrictive effect of PGE2 and cAMP upon virus replication is correlated with modifications occurring in the actin cytoskeleton.

Prostaglandin E2 (PGE2) effect upon ICP-23 human pulmonary fibroblasts growth in culture and on measles virus multiplication in this cell type

The influence of PGE2 in different concentrations (10(-4)M, 10(-6)M, 10(-8)M) and of 1 mM AMPc upon ICP-23 human pulmonary fibroblasts and also the influence of PGE2 upon measles virus multiplication in the same cell type were studied. PGE2 inhibited fibroblasts growth in all administered concentrations, depending on them. AMPc adding to human fibroblasts in culture progressively stimulated cells growth in the first 24 hours, produced a steady growth during 24-48-hour interval and slightly inhibited cellular divisions between 48 and 72 hours. PGE2, added in the same concentrations to measles virus--infected ICP-23 cells, concomitantly with virus administration and after 1 hour of viral adsorption influenced viral multiplication, depending on substance concentration and culturing period. Obtained data suggested that PGE2 in physiological concentrations (10(-6)M, 10(-8)M) initially has a weak inhibitory effect (titration after 6 days), but then stimulates viral production (9 days). The initial inhibition is more marked when the substance is added concomitantly with virus administration.