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- W1973270689 abstract "Filter-sterilized sonic extracts (SE) of strains of Actinobacillus actinomycetemcomitans were shown to inhibit the proliferation of human gingival fibroblasts in vitro. The inhibition was dose-dependent: a 50 per cent inhibitory dose of 2 μg protein/ml was found for A. actinomycetemcomitans strain Y4. The inhibitory activity could be neutralized by homologous antiserum and was heat inactivated by temperatures of 80 °C or greater. The fibroblast-inhibitory activity was present in SEs of both leukotoxin-producing and non-leukotoxic strains of A. actinomycetemcomitans, suggesting that a separate agent is responsible for leukotoxicity and fibroblast inhibition. A short (10 min) exposure of the fibroblasts to the A. actinomycetemcomitans SE was sufficient to inhibit irreversibly cell proliferation, provided that serum was present at the time that the cells were exposed to the SE. SE-challenged fibroblasts exhibited a marked decrease in the rate of DNA synthesis, but no inhibition of RNA or protein synthesis. Although the SE-treated cells did not proliferate, they appeared to remain intact and viable; and displayed no gross morphological alterations." @default.
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- W1973270689 date "1983-01-01" @default.
- W1973270689 modified "2023-09-27" @default.
- W1973270689 title "Cytotoxicity of the bacterium Actinobacillus actinomycetemcomitans extracts in human gingival fibroblasts" @default.
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- W1973270689 doi "https://doi.org/10.1016/0003-9969(83)90051-1" @default.
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