Table of Contents
Journal of Histology
Volume 2013 (2013), Article ID 812842, 5 pages
Research Article

Histochemical Expression of Mast Cell Chymase in Chronic Periodontitis and Cyclosporine-Induced Gingival Overgrowth

1Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
2Department of Periodontics, Faculty of Dental Science, Sri Ramachandra University, Chennai 600116, India
3Virology Division, National Environmental Engineering Research Institute, Chennai 600113, India
4Department of Nephrology, Faculty of Medicine, Sri Ramachandra University, Chennai 600116, India

Received 18 February 2013; Revised 27 March 2013; Accepted 28 March 2013

Academic Editor: Francesco Cappello

Copyright © 2013 Tamilselvan Subramani et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Mast cell (MC) mediators play a vital role in fibrosis. The purpose of this study was to investigate the MCs and their enzyme chymase in gingival tissues showing drug-induced gingival overgrowth (DIGO) and also to evaluate the correlation of MC counting and expression with the chronic periodontitis. In this study, 30 samples, including cyclosporine-induced gingival overgrowth, chronic periodontitis (10 for each), and ten normal gingival tissues, were collected. We analyzed the histochemical expression of MC chymase in all the collected tissues. In addition, the number of MCs was counted for each deparaffinized section stained with toluidine blue. Furthermore, total RNA was extracted from tissue samples, and RT-PCR was performed for MC chymase. The numbers of MCs were found to be increased in relative lesions compared to normal gingival tissues ( ). Moreover, chymase-containing MCs in DIGO tissues showed striking differences from those of control subjects and chronic periodontitis ( ). The RT-PCR analysis further revealed that MC chymase mRNA increased significantly in DIGO tissues. In conclusion, although the MCs were less numerous in numbers, the cells exhibited significant expression of chymase enzyme suggesting the involvement of MCs in DIGO.