Abstract
The binding activity of [ 3H]dexamethasone to the specific receptor was studied in the cytoplasmic fraction of a established fibroblast line derived from rat carrageenin granuloma in culture condition. Specific receptor to dexamethasone was demonstrated. Scatchard analysis revealed a single class of binding sites with a dissociation constant for [ 3H]dexamethasone of 3.64 · 10 −8 M and a concentration of binding sites of 0.825 pmol per mg cytosol protein. The number of cytoplasmic binding sites per cell was calculated at 1.15 · 10 5. Total binding activity to [ 3H]dexamethasone of the cytoplasmic fraction was enhanced when the cells were cultured in a medium containing salicylic acid at 37°C. The maximum enhancement was seen at the concentration of 10 −3 M and in 3 h treatment of salicylic acid. This enhancement by salicylic acid was lost when cycloheximide was added to the culture medium at the same time. If salicylic acid was added to the cell free system, it showed no effect on the binding activity. The other non-steroidal anti-inflammatory drugs; phenylbutazone and indomethacin, also enhanced the total binding activity to [ 3H]dexamethasone of the cytoplasmic fraction at the concentration of 2 · 10 −5 M and 2 · 10 −7 M, respectively.
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