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Abstract

A mechanism of action of gold sodium thiomalate in diseases characterized by a proliferative synovitis: reversible changes in collagen production in cultured human synovial cells.

R L Goldberg, D P Parrott, S R Kaplan and G C Fuller
Journal of Pharmacology and Experimental Therapeutics August 1981, 218 (2) 395-403;
R L Goldberg
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D P Parrott
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S R Kaplan
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G C Fuller
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Abstract

These studies, conducted on early passage synovial cell mono-layers (derived from explant cultures of tissue obtained from patients with rheumatoid arthritis), have established that gold sodium thiomalate (GST) exposure results in dose-dependent changes in cell proliferation and protein synthesis as a consequence of the cellular accumulation of gold. The amount of gold found in the cell layer is correlated with the degree of inhibition of [3H]thymidine incorporation. Gold remains in the cell layer of treated cells after they have been subcultured twice in the absence of GST. Exposure of cells to a concentration of GST of 100 muM for 4 days results in 50% inhibition of [3H]thymidine incorporation. This antiproliferative effect is reversible at concentrations of 10 muM GST or less. Only partial recovery is observed after exposure to higher concentrations of GST which may be related to retained gold. The amount of collagen and noncollagen protein synthesized per cell increases at concentrations of GST of 10 muM and below but decreases with concentrations above 10 muM. A dose-dependent decrease in protein synthesized per flask and a decrease in the commitment to synthesize collagen relative to total protein synthesis follows exposure to GST in excess of 10 muM for 20 days which recovers partially after synovial cells are grown in GST-free medium for 10 days. An observed decrease in the percentage of type III collagen synthesized by synovial cells after GST exposure was not observed in cells grown in GST-free medium for 5 days after exposure, indicating that this effect of collagen synthesis is reversible. The reversible biochemical changes resulting from the exposure of cultured human synovial cells to GST are discussed as a mechanism of action of this drug on the proliferative synovitis that characterizes diseases such as rheumatoid arthritis.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 218, Issue 2
1 Aug 1981
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Abstract

A mechanism of action of gold sodium thiomalate in diseases characterized by a proliferative synovitis: reversible changes in collagen production in cultured human synovial cells.

R L Goldberg, D P Parrott, S R Kaplan and G C Fuller
Journal of Pharmacology and Experimental Therapeutics August 1, 1981, 218 (2) 395-403;

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Abstract

A mechanism of action of gold sodium thiomalate in diseases characterized by a proliferative synovitis: reversible changes in collagen production in cultured human synovial cells.

R L Goldberg, D P Parrott, S R Kaplan and G C Fuller
Journal of Pharmacology and Experimental Therapeutics August 1, 1981, 218 (2) 395-403;
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