Which trio of organisms has been reported to be inhibited by this RNS generation?

Which trio of organisms has been reported to be inhibited by this RNS generation?

• A. S. mutans, Aggregatibacter actinomycetemcomitans, and Enterococcus faecalis
• B. S. mutans, Porphyromonas gingivalis, and Enterococcus faecalis
• C. Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, and Enterococcus faecalis
• D. S. mutans, Aggregatibacter actinomycetemcomitans, and Porphyromonas gingivalis

Answer: (A)

Reactive nitrogen species (RNS) cause nitrosative stress by modifying proteins, damaging DNA, and disrupting membranes and respiration. Bacteria differ in how well they can detoxify or withstand this stress, so some are inhibited while others survive under the same RNS exposure. In this context, the organisms that have been reported to be inhibited are Streptococcus mutans, Aggregatibacter actinomycetemcomitans, and Enterococcus faecalis. Their susceptibility likely reflects weaker nitrosative defenses or greater sensitivity of their metabolic processes to nitrosative modifications under the conditions tested. Porphyromonas gingivalis, while another periodontal pathogen, often possesses more robust mechanisms to cope with RNS or benefits from biofilm protection, making it less susceptible in the same scenario. This difference highlights how the ability to detoxify reactive nitrogen species and the local microbial environment shape which species are inhibited.

Reactive nitrogen species (RNS) cause nitrosative stress by modifying proteins, damaging DNA, and disrupting membranes and respiration. Bacteria differ in how well they can detoxify or withstand this stress, so some are inhibited while others survive under the same RNS exposure.

In this context, the organisms that have been reported to be inhibited are Streptococcus mutans, Aggregatibacter actinomycetemcomitans, and Enterococcus faecalis. Their susceptibility likely reflects weaker nitrosative defenses or greater sensitivity of their metabolic processes to nitrosative modifications under the conditions tested.

Porphyromonas gingivalis, while another periodontal pathogen, often possesses more robust mechanisms to cope with RNS or benefits from biofilm protection, making it less susceptible in the same scenario. This difference highlights how the ability to detoxify reactive nitrogen species and the local microbial environment shape which species are inhibited.