Epithelial Microvesicles Promote an Inflammatory Phenotype in Fibroblasts

Area of Science:

• Cell Biology
• Oral Biology
• Biochemistry

Background:

• Microvesicles (MVs) mediate intercellular communication.
• Periodontal disease involves inflammation and tissue destruction.
• Epithelial cells and fibroblasts play key roles in periodontal tissues.

Purpose of the Study:

• To investigate if pocket epithelium-derived MVs modulate fibroblast gene expression in periodontal disease.
• To determine the effect of bacterial biofilm on MV release and function.
• To elucidate the role of MVs in periodontal inflammation and fibroblast phenotype.

Main Methods:

• Isolation of MVs from gingival epithelial cells (GECs) with and without bacterial biofilm extract.
• Mass spectrometry to identify proteins in GEC-MVs.
• Analysis of gene expression changes in human gingival fibroblasts treated with GEC-MVs.
• Assessment of signaling pathway activation (Smad, MAPK pathways).

Main Results:

• Bacterial biofilm significantly increased MV release from GECs.
• GEC-MVs regulated 20 out of 80 signature fibroblast genes, including those for matrix metalloproteinases and interleukins.
• ERK1/2 signaling pathway was predominantly activated by GEC-MVs, influencing gene expression.

Conclusions:

• Gingival epithelial cell-derived microvesicles strongly regulate fibroblast genes involved in inflammation and matrix degradation.
• Bacterial biofilms stimulate GEC-MV generation.
• Enhanced MV secretion by epithelial cells, triggered by biofilms, may promote a tissue-destructive fibroblast phenotype, contributing to periodontal disease.