Gingipain-Mediated Matrix Metalloproteinase-8 and -9 Activation in Oral Rinse Samples from Patients with Cancer: A...

Area of Science:

• Oral microbiology
• Periodontology
• Oncology

Background:

• Periodontal disease is common in cancer patients.
• Porphyromonas gingivalis and its virulence factors, gingipains, are implicated in periodontal inflammation.
• Matrix metalloproteinases (MMPs), specifically MMP-8 and MMP-9, play roles in tissue destruction and inflammation.

Purpose of the Study:

• To investigate the association between P. gingivalis gingipains and the activation of MMP-8 and MMP-9 in cancer patients.
• To evaluate the utility of an active MMP-8 (aMMP-8) chair-side test for early detection of periodontal inflammation in cancer patients.

Main Methods:

• Cross-sectional study of 89 cancer patients.
• Quantification of aMMP-8 using a chair-side test on oral rinse samples.
• Measurement of total MMP-8 (ELISA), MMP-9 activation (gelatin zymography), and gingipain presence (Western immunoblotting).
• Analysis of associations with periodontal parameters (PPD, GI, OHI-S, VPI) using linear regression.

Main Results:

• The aMMP-8 chair-side test showed 91% positive results in cancer patients.
• Gingipains were co-localized with fragmented MMP-8.
• aMMP-8 levels correlated significantly with MMP-9 activation (p=0.003) and oral hygiene indices (OHI-S: p=0.003, VPI: p=0.014), indicating early inflammation detection.
• Associations with deeper periodontal parameters were less significant (PPD: p=0.094, GI: p=0.358).

Conclusions:

• Gingipain presence may contribute to MMP-8 and MMP-9 activation in cancer patients, linking bacterial virulence to tissue damage.
• The aMMP-8 chair-side test facilitates rapid identification of active periodontal inflammation.
• Timely periodontal intervention can be integrated into cancer care protocols.