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Infection and Immunity logoLink to Infection and Immunity
. 1994 Oct;62(10):4682–4685. doi: 10.1128/iai.62.10.4682-4685.1994

Effects of temperature stress on expression of fimbriae and superoxide dismutase by Porphyromonas gingivalis.

A Amano 1, A Sharma 1, H T Sojar 1, H K Kuramitsu 1, R J Genco 1
PMCID: PMC303167  PMID: 7927742

Abstract

We examined the biosynthesis of fimbriae and superoxide dismutase (SOD) produced by the periodontopathic bacterium Porphyromonas gingivalis in response to elevated temperature. P. gingivalis 2561, grown at 37 degrees C to mid-logarithmic phase, was subsequently incubated at 39, 41, and 43 degrees C, respectively, to stationary phase. There was no difference in the growth of cells at 37 and 39 degrees C. However, at 39 degrees C there was a 54% reduction in the amount of fimbrillin (fimbriae) as well as decreased expression of mRNA for fimA. On the other hand, under the same conditions, a more than twofold increase in the amount of SOD activity, as well as in the levels of SOD mRNA, was observed. Moreover, cells cultured for 20 h at 39 degrees C showed an 86% decrease of fimbrillin protein and a threefold increase in SOD activity. These observations suggest that P. gingivalis may undergo alterations in its virulence and susceptibility to host immune responses as a result of the elevated temperatures found in inflamed periodontal pockets.

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Selected References

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