Comparison of gene expression profiles of human dental pulp cells treated with mineral trioxide aggregate and calcium hydroxide

Article information

Restor Dent Endod. 2011;36(5):397-408

Publication date (electronic) : 2011 September 14

doi : https://doi.org/10.5395/JKACD.2011.36.5.397

Yong-Beom Kim, DDS, MSD, PhD ¹, Won-Jun Shon, DDS, MSD, PhD ², Woocheol Lee, DDS, MSD, PhD ², Kee-Yeon Kum, DDS, MSD, PhD ², Seung-Ho Baek, DDS, MSD, PhD ², Kwang-Shik Bae, DDS, MSD, PhD ²^,

¹Program in Conservative Dentistry, Seoul National University Graduate School

²Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea

^*Correspondence to: Kwang-Shik Bae, DDS, MSD, PhD., Professor, Department of Conservative Dentistry, Seoul National University School of Dentistry, Dental Research Institute, 28-2 Yongon-dong, Jongno-gu, Seoul, Korea 110-749, Tel, +82-2-2072-2651; Fax, +82-2-2072-3859; E-mail, baeks@snu.ac.kr

Received 2011 July 20; Revised 2011 August 17; Accepted 2011 August 21.

Abstract

Objectives:

This study investigated changes in gene expressions concerning of differentiation, proliferation, mineralization and inflammation using Human-8 expression bead arrays when white Mineral Trioxide Aggregate and calcium hydroxide-containing cement were applied in vitro to human dental pulp cells (HDPCs).

Materials and Methods:

wMTA (white ProRoot MTA, Dentsply) and Dycal (Dentsply Caulk) in a Teflon tube (inner diameter 10 mm, height 1 mm) were applied to HDPCs. Empty tube-applied HDPCs were used as negative control. Total RNA was extracted at 3, 6, 9 and 24 hr after wMTA and Dycal application. The results of microarray were confirmed by reverse transcriptase polymerase chain reaction.

Results:

Out of the 24,546 genes, 43 genes (e.g., BMP2, FOSB, THBS1, EDN1, IL11, COL10A1, TUFT1, HMOX1) were up-regulated greater than two-fold and 25 genes (e.g., SMAD6, TIMP2, DCN, SOCS2, CEBPD, KIAA1199) were down-regulated below 50% by wMTA. Two hundred thirty nine genes (e.g., BMP2, BMP6, SMAD6, IL11, FOS, VEGFA, PlGF, HMOX1, SOCS2, CEBPD, KIAA1199) were up-regulated greater than two-fold and 358 genes (e.g., EDN1, FGF) were down-regulated below 50% by Dycal.

Conclusions:

Both wMTA and Dycal induced changes in gene expressions related with differentiation and proliferation of pulp cells. wMTA induced changes in gene expressions related with mineralization, and Dycal induced those related with angiogenesis. The genes related with inflammation were more expressed by Dycal than by wMTA. It was confirmed that both wMTA and Dycal were able to induce gene expression changes concerned with the pulp repair in different ways.

Keywords: Calcium hydroxide; Microarray; Mineral trioxide aggregate; Pulp capping; Pulp cell; Reverse transcriptase polymerase chain reaction

Figure 1.

Classification of expressed genes by wMTA treatment. The genes which were up-or down-regulated by at least twofold following a cellular treatment with wMTA at any time point were classified using the panther classification system (http://www.pantherdb.org).

Figure 2.

Classification of expressed genes by Dycal treatment. The genes which were up-or down-regulated by at least twofold following a cellular treatment with Dycal at any time point were classified using the panther classification system.

Table 1.

Primer sequence list used in RT-PCR

Table 2.

Summary of expression profiles of genes differentially regulated by wMTA and Dycal

Table 3.

The relative mRNA expression levels of genes analyzed by RT-PCR

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