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Braz Oral Res. 2017 Jul 3;31:e51. doi: 10.1590/1807-3107BOR-2017.vol31.0051.

Immunohistochemical expression of TGF-β1 and MMP-9 in periapical lesions.

Author information

1
Universidade de Pernambuco - UPE, School of Dentistry, Department of Oral Pathology, Camaragibe, PB, Brazil.
2
Universidade Federal do Rio Grande do Norte - UFRN, School of Dentistry, Department of Oral Pathology, Natal, RN, Brazil.
3
Universidade Federal de Campina Grande - UFCG, Department of Stomatology, School of Dentistry, Campina Grande, PB, Brazil.
4
Universidade de Pernambuco - UPE, School of Dentistry, Department of Stomatology, Camaragibe, PB, Brazil.

Abstract

The objective of this study was to evaluate the expression of matrix metalloproteinase 9 (MMP-9) and transforming growth factor beta (TGF-β1) in periapical lesion samples correlated with the intensity of the inflammatory infiltrate and thickness of the epithelial lining. Forty-five cases of periapical lesions (23 periapical granulomas and 22 radicular cysts) were subjected to morphological and immunohistochemical analyses using anti-MMP-9 and anti-TGF-β1 antibodies. The data were analyzed using the following tests: non-parametric Mann-Whitney, chi-square, Fisher's exact test and Spearman's correlation test (P<0.05). Analysis of inflammatory infiltrate revealed that 78% of periapical granulomas presented infiltrate grade III, in contrast with 32% of radicular cysts (P<0.001). Morphological evaluation of the epithelial thickness in radicular cysts revealed the presence of atrophic epithelium in 86% of the cysts. The immunostaining of MMP-9 was score 2 in 67% of the granulomas and 77% of the cysts. Both lesions were predominantly score 1 for TGF-β1. Significant differences were confirmed between the expression scores of TGF-β1 and MMP-9 in periapical granulomas (p = 0.004) and in radicular cysts (p < 0.001). Expression of TGF-β1 was different for periapical granulomas and radicular cysts. This immunoregulatory cytokine seems more representative in asymptomatic lesions. The extracellular matrix remodeling process dependent on MMP-9 seems to be similar for both periapical granulomas and radicular cysts. TGF-β1 and MMP-9 may play an important role in the maintenance of periapical lesions.

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