Objective: The objective of this study was to perform a landscape analysis of apoptosis-related genes/proteins and to study the differential gene expression by analysing array data from periodontitis patients and, second, to evaluate the anti-apoptotic effects of carvacrol, a monoterpenoid phenol, in vitro.
Design: A gene/protein interaction network model 'APOP' was developed by using the Search Tool for the Retrieval of Interacting Genes/Proteins (STRING) version 9.05. Differential gene expression was determined by using the limma package from R and false discovery rate (FDR). With ViaComplex software, gene expression was plotted over the network. The anti-apoptotic effect of carvacrol was tested on sorbitol-treated HaCaT cells, by using a commercial kit for caspase-3 activity.
Results: The 'APOP' model characterised the landscape of interactions between apoptosis-related genes/proteins in silico. Forty-nine out of 70 genes from this model, such as CSF2RB, NFKBIE, ENDOG, CASP10 and CASP3, were differentially expressed (corrected p-value<0.05) in periodontitis samples when compared to those of healthy controls. In addition, carvacrol (0.43%) was able to inhibit the pro-apoptotic effects induced by sorbitol (0.3M), as seen by the reduction in caspase-3 activity on HaCaT cells.
Conclusion: Our results suggest that caspase-3 can be a target protein to inhibit periodontitis-associated apoptosis of epithelial cells and that carvacrol has therapeutic potential as an anti-apoptotic agent.
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