Corroding characteristics of Eikenella corrodens

Area of Science:

• Oral microbiology
• Bacterial pathogenesis
• Periodontal disease research

Background:

• Eikenella corrodens is a common inhabitant of the human oral cavity.
• Certain strains of E. corrodens exhibit corrosive properties, which may contribute to periodontal tissue destruction.

Purpose of the Study:

• To investigate the corrosive characteristics of Eikenella corrodens strains isolated from the human oral cavity.
• To elucidate the morphological features associated with corrosive colony formation in E. corrodens.

Main Methods:

• Isolation and culturing of 14 E. corrodens strains from human oral samples.
• Assessment of corrosive colony production under anaerobic and aerobic conditions.
• Microscopic examination (transmission electron microscopy and scanning electron microscopy) of bacterial morphology and colony structures.

Main Results:

• Nine out of 14 E. corrodens strains demonstrated corrosive colony formation under anaerobic conditions.
• One strain exhibited corrosion even in aerobic culture.
• Transmission electron microscopy revealed no significant surface structure differences between corroding and non-corroding strains.
• Scanning electron microscopy showed distinct colony morphologies, including a smooth convex center and frill-like structures, with spreading bacterial masses at the edge.
• Evidence suggests twitching or gliding motility at the colony edge contributes to periodontal colonization.

Conclusions:

• Eikenella corrodens possesses the ability to form corrosive colonies, with varying prevalence among oral isolates.
• Bacterial motility, specifically twitching or gliding, appears crucial for the colonization of periodontal regions by E. corrodens.
• Understanding these corrosive mechanisms is vital for developing strategies to combat periodontal diseases.