Gene expression analysis of conventional and interactive human gingival cell systems exposed to dental composites.

Abstract

OBJECTIVES:

The aim of this study was the detection of putative gene expression-related effects of dental composites in conventional and interactive gingival cell systems.

METHODS:

Conventional monoculture (MC) and interactive cell systems (ICS) comprising human gingival fibroblast (HGF) and immortalized human gingival keratinocytes (IHGK) were exposed for 24h and 7 days according to ISO10993-12:2012 manufactured eluates of different composites (Ceram X(®), Filtek™ Supreme XT, Filtek™ Silorane, Fusio™ Liquid Dentin, and Vertise™ Flow). qRT-PCR-based mRNA analysis for biomarkers indicating cell proliferation, differentiation, apoptosis, inflammation, and adhesion was performed. Apoptotic cells were quantified by annexin-V labeling.

RESULTS:

Due to low RNA amounts, qPCR could not be performed for Vertise™ Flow and Fusio™ Liquid Dentin at day 7. At 24h, flowables yielded increased transcription for biomarkers of inflammation and apoptosis in IHGK, irrespective of the cell system. HGF cultures displayed lower transcription for cell adhesion markers in both cell systems. Filtek™ Supreme XT showed increased differentiation by elevated filaggrin gene expression in both cell systems for IHGK at day 7, while Filtek™ Silorane and Ceram X(®) yielded elevation of inflammation biomarkers in both cell types. Annexin-V labeling revealed high apoptosis rates for both flowables and Filtek™ Supreme XT for IHGK, while low rates were detected for Filtek™ Silorane and Ceram X(®).

SIGNIFICANCE:

Among the composites evaluated, exposition of IHGK and HGF in conventional and interactive cell systems demonstrated most pronounced gene expression alterations in response to flowables, coinciding with elevated levels of apoptosis.

• Authors: Simon Daniel Schulz, Christopher Rüppell, Pascal Tomakidi, Thorsten Steinberg, Franz-Xaver Reichl, Elmar Hellwig, Olga Polydorou
• Journal: Dental materials : official publication of the Academy of Dental Materials (Dent Mater) Vol. 31 Issue 11 Pg. 1321-34 (Nov 2015) ISSN: 1879-0097 [Electronic] England
• PMID: 26345997 (Publication Type: Journal Article)
• Copyright: Copyright © 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

Chemical References

• Dentin-Bonding Agents
• FLG protein, human
• Filaggrin Proteins
• Silorane Resins
• RNA

Topics

• Apoptosis
• Dentin-Bonding Agents (toxicity)
• Fibroblasts (metabolism)
• Filaggrin Proteins
• Gene Expression
• Gingiva (cytology, metabolism)
• Humans
• Keratinocytes (metabolism)
• RNA
• Silorane Resins (toxicity)