title: Superinduction of T lymphocyte-endothelial cell (EC) binding by treatment of EC with interleukin 1 and protein synthesis inhibitors.
abstract: We have previously reported that marked enhancement of the in vitro binding of lymphocytes to endothelial cell (EC) monolayers is observed after stimulation of the EC with interleukin 1 (IL 1). To determine whether new protein synthesis was required for this effect of IL 1, EC were incubated with IL 1 in the presence of cycloheximide or puromycin. Three different effects of these protein synthesis inhibitors on T-EC binding were observed. First, preincubation of the EC with both IL 1 and an inhibitor blocked the increase in binding if the inhibitor was present during both the preincubation and the 1 hr duration of the T-EC binding assay, suggesting that new protein synthesis is required for the enhancement of T-EC adhesion by IL 1. Second, preincubation of the EC with low doses of the inhibitors (0.1 to 1 microgram/ml) in the absence of IL 1 consistently increased T-EC binding, even if the inhibitors were present during the T-EC adhesion assay; in addition, the inhibitors additionally increased the stimulatory effect of IL 1 if the EC were washed free of the inhibitor before the assay step. The binding-enhancing effect of low concentrations of cycloheximide could be inhibited by an antibody to the CDw18 complex on the T cell, suggesting an up-regulation of the ligand on the EC involved in CDw18-dependent T cell adhesion. Third, higher concentrations of the inhibitors (3 to 10 micrograms/ml) were toxic for the EC in the presence of IL 1, possibly due to the combined blocking effect of IL 1 and inhibitors on EC protein synthesis.
mesh_terms: D000954:Antigens, Surface / Q000502:physiology; D002448:Cell Adhesion / Q000187:drug effects; D003513:Cycloheximide / Q000494:pharmacology*; D004727:Endothelium / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology*; D016169:Lymphocyte Function-Associated Antigen-1; D011956:Receptors, Cell Surface / Q000096:biosynthesis; D013601:T-Lymphocytes / Q000166:cytology*; D013997:Time Factors
chemical_list: D000954:Antigens, Surface; D007375:Interleukin-1; D016169:Lymphocyte Function-Associated Antigen-1; D011956:Receptors, Cell Surface; D003513:Cycloheximide