Virulence Mechanisms in Treponema denticola Related to Periodontal Disease

Treponema denticola, a spirochaete resident of the subgingival niche, contributes to periodontal destruction through a multifaceted arsenal of virulence factors. Central to its pathogenicity is the dentilisin protease complex, an acylated subtilisin‐family enzyme embedded in the outer membrane that degrades host extracellular matrix proteins, cleaves complement components and dysregulates immunomodulatory peptides. The major outer sheath protein (Msp) perturbs host cell cytoskeletal dynamics by inducing phosphatidylinositol‐bisphosphate–dependent actin uncapping, thereby impairing neutrophil chemotaxis and fibroblast function. Motility conferred by periplasmic flagella promotes interspecies synergy with Porphyromonas gingivalis and enhances biofilm development, facilitating deeper tissue penetration. Complement evasion is further achieved by a surface‐exposed factor H–binding protein (FhbB) that recruits and then degrades host regulator of complement activation, enabling survival in the inflammatory milieu. Activation of host pattern‐recognition receptors, notably Toll‐like receptor 2 (TLR2), by lipoprotein moieties on dentilisin initiates MyD88‐dependent signalling cascades, culminating in Sp1‐mediated upregulation of matrix metalloproteinases (MMPs) and subsequent collagen degradation. In addition, T. denticola adapts to metal limitation via a manganese‐ and iron‐sensitive transcriptional repressor, TroR, which modulates cation uptake systems. This combination of proteolysis, immune modulation, motility and nutritional adaptability underpins the global significance of T. denticola as a keystone agent in periodontitis and highlights targets for therapeutic intervention.

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Virulence Mechanisms in Treponema denticola Related to Periodontal Disease publication trend

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Technical terms

Dentilisin: A membrane‐associated protease complex unique to oral spirochaetes that degrades host structural and regulatory proteins.

Msp (Major Outer Sheath Protein): An abundant surface protein that disrupts host actin dynamics and calcium signalling.

Toll‐like receptor 2 (TLR2): A pattern‐recognition receptor that senses acylated bacterial lipoproteins and initiates proinflammatory signalling.

MyD88: An adaptor protein required for downstream signalling of most TLRs, leading to activation of transcription factors.

Matrix metalloproteinases (MMPs): A family of host‐derived zinc‐dependent endopeptidases that degrade extracellular matrix components.

Periplasmic flagella: Flagellar filaments enclosed within the periplasmic space that confer motility and influence biofilm formation.

Biofilm: A structured community of microorganisms attached to a surface and embedded in a self‐produced matrix.

Factor H–binding protein (FhbB): A treponemal surface protein that recruits host complement regulator factor H for immune evasion.

References

1. Approaches to Understanding Mechanisms of Dentilisin Protease Complex Expression in Treponema denticola. Frontiers in Cellular and Infection Microbiology (2021).
2. The Role of Treponema denticola Motility in Synergistic Biofilm Formation With Porphyromonas gingivalis. Frontiers in Cellular and Infection Microbiology (2019).
3. Treponema denticola Major Outer Sheath Protein Induces Actin Assembly at Free Barbed Ends by a PIP2-Dependent Uncapping Mechanism in Fibroblasts. PLOS ONE (2011).
4. Treponema denticola Major Outer Sheath Protein Impairs the Cellular Phosphoinositide Balance That Regulates Neutrophil Chemotaxis. PLOS ONE (2013).
5. Structure of Factor H-binding Protein B (FhbB) of the Periopathogen, Treponema denticola INSIGHTS INTO PROGRESSION OF PERIODONTAL DISEASE*. Journal of Biological Chemistry (2012).
6. Treponema denticola dentilisin triggered TLR2/MyD88 activation upregulates a tissue destructive program involving MMPs via Sp1 in human oral cells. PLOS Pathogens (2021).
7. Treponema denticola TroR is a manganese‐ and iron‐dependent transcriptional repressor. Molecular Microbiology (2008).