Microarray analysis of the gene expression profile in triethylene glycol dimethacrylate-treated human dental pulp cells

Abstract

Objective: Triethylene glycol dimethacrylate (TEGDMA) is an important resin monomer commonly used in the structure of dental restorative materials. Recent studies have shown that unpolymerized resin monomers may be released into the oral environment and cause harmful biological effects. We investigated changes in the gene expression profiles of TEGDMA‑treated human dental pulp cells (hDPCs) following short‑ (1‑day) and long‑term (7‑days) exposure.

Materials and Methods: HDPCs were exposed to a noncytotoxic concentration of TEGDMA, and gene expression profiles were evaluated by microarray analysis. The results were confirmed by quantitative reverse-transcriptase PCR (qRT PCR).

Results: In total, 1282 and 1319 genes (up‑ or down‑regulated) were differentially expressed compared with control group after the 1‑ and 7‑day incubation periods, respectively. Biological ontology-based analyses revealed that metabolic, cellular, and developmental processes constituted the largest groups of biological functional processes. qRT‑PCR analysis on bone morphogenetic protein‑2 (BMP‑2), BMP‑4, secreted protein, acidic, cysteine‑rich, collagen type I alpha 1, oxidative stress‑induced growth inhibitor 1, MMP3, interleukin‑6, and heme oxygenase‑1 genes confirmed the changes in expression observed in the microarray analysis.

Conclusions: Our results suggest that TEGDMA can change the many functions of hDPCs through large changes in gene expression levels and complex interactions with different signaling pathways.

Keywords: Gene expression, human dental pulp cell, microarray, triethylene glycol dimethacrylate