A Modular Workflow for Quantitative, Structural and Functional Analysis of Leptospira Biofilms

Area of Science:

• Microbiology
• Bacteriology
• Infectious Diseases

Background:

• Leptospira spp. form biofilms, contributing to their persistence and pathogenesis.
• Understanding Leptospira biofilm structure and function is critical for developing effective treatments.

Purpose of the Study:

• To present an integrated suite of protocols for the comprehensive analysis of Leptospira spp. biofilms.
• To enable quantitative monitoring, structural and functional characterization, and in vivo virulence assessment of Leptospira biofilms.

Main Methods:

• Utilized crystal violet assays for biofilm biomass quantification.
• Employed time-resolved fractionation to separate biofilm and planktonic populations.
• Applied time-lapse imaging, confocal laser-scanning microscopy, and scanning electron microscopy for structural and kinetic analysis.
• Developed a standardized protocol for in vivo virulence assessment using the golden Syrian hamster model.

Main Results:

• Established a robust workflow for characterizing Leptospira biofilms over time.
• Demonstrated the ability to assess biofilm-associated virulence in vivo.
• Validated the protocols for the pathogenic strain Leptospira interrogans Manilae L495.

Conclusions:

• The presented integrated workflow provides a foundation for screening anti-biofilm strategies.
• Facilitates the investigation of genetic determinants of biofilm formation.
• Aids in clarifying the role of biofilms in Leptospira persistence and pathogenesis.