Advertisement

Current Microbiology

, Volume 44, Issue 4, pp 262–266 | Cite as

Repressed Respiration of Oral Streptococci Grown in Biofilms

  • Phuong T. M. Nguyen
  • Jacqueline Abranches
  • Tuan-Nghia Phan
  • Robert E. Marquis

Abstract

The respiratory activities of oral streptococci grown in biofilms were found to be markedly repressed compared with those of cells from aerobic culture, or for Streptococcus mutans GS-5, even for those grown in static culture. Respiration rates generally reflected levels of NADH oxidase activities in cell extracts. Superoxide dismutase levels were somewhat reduced in biofilm cells. However, sensitivities to oxidative damage caused by H2O2, t-butylhydroperoxide, or 8-hydroxyquinoline were not greatly different for cells from suspension cultures and those from either intact or dispersed biofilms. The capacities of S. sanguis and S. gordonii to produce H2O2 also were markedly repressed by biofilm growth, and presumably this repression would affect the ecology of dental plaque by reducing oxidative stresses under crowded conditions.

Keywords

Superoxide Respiration NADH Respiration Rate Superoxide Dismutase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag New York Inc. 2002

Authors and Affiliations

  • Phuong T. M. Nguyen
    • 1
  • Jacqueline Abranches
    • 1
  • Tuan-Nghia Phan
    • 1
  • Robert E. Marquis
    • 1
  1. 1.Department of Microbiology & Immunology, Box 672, University of Rochester Medical Center, Rochester, NY 14642-8672, USAUS

Personalised recommendations