Pathology & Oncology Research

, Volume 15, Issue 2, pp 231–240

Presence of Myofibroblasts and Expression of Matrix Metalloproteinase-2 (MMP-2) in Ameloblastomas Correlate with Rupture of the Osseous Cortical

  • Eduardo Rodrigues Fregnani
  • Lays M. Sobral
  • Fabio Abreu Alves
  • Fernando Augusto Soares
  • Luis Paulo Kowalski
  • Ricardo D. Coletta
Original Paper

DOI: 10.1007/s12253-008-9110-4

Cite this article as:
Fregnani, E.R., Sobral, L.M., Alves, F.A. et al. Pathol. Oncol. Res. (2009) 15: 231. doi:10.1007/s12253-008-9110-4

Abstract

Myofibroblasts are frequent in the stroma of neoplasm and by the expression of proteinases they can influence tumor infiltration and progression. In the present study, presence of myofibroblasts and expression of matrix metalloproteinase-2 (MMP-2) and urokinase plasminogen activator (uPA) were examined in intra-osseous solid multicystic ameloblastomas to determine their roles in the clinicopathological features of the tumors. Fifty seven ameloblastomas were analyzed immunohistochemically with antibodies against the isoform α of the smooth muscle actin (α-SMA), a specific marker of myofibroblasts, MMP-2 and uPA. Myofibroblasts were found in the stroma, in close contact with neoplastic cell islands, of ~58% (n = 33) of the ameloblastomas. MMP-2 and uPA were found in the cytoplasm of both neoplastic and stromal cells. A significant correlation between presence of myofibroblasts and MMP-2 expression was observed. Abundant presence of myofibroblast in the stroma of the tumors and expression of MMP-2 in the neoplastic or stromal cells were significantly correlated with rupture of the osseous cortical, which has been considered an important prognostic marker of ameloblastoma aggressiveness. Ours results suggest that abundant presence of myofibroblasts and expression of MMP-2 in solid ameloblastomas may be associated with a more aggressive infiltrative behavior.

Keywords

Ameloblastoma Matrix metalloproteinase-2 Myofibroblast Prognosis Urokinase plasminogen activator 

Supplementary material

12253_2008_9110_MOESM1_ESM.doc (35 kb)
TableCorrelation of the bone cortical status and duration of the symptoms or tumor size in ameloblastomas (DOC 35.0 KB).

Copyright information

© Arányi Lajos Foundation 2008

Authors and Affiliations

  • Eduardo Rodrigues Fregnani
    • 1
  • Lays M. Sobral
    • 2
  • Fabio Abreu Alves
    • 1
  • Fernando Augusto Soares
    • 3
  • Luis Paulo Kowalski
    • 4
  • Ricardo D. Coletta
    • 2
  1. 1.Department of StomatologyA. C. Camargo Cancer HospitalSão PauloBrazil
  2. 2.Department of Oral DiagnosisSchool of Dentistry, State University of CampinasPiracicabaBrazil
  3. 3.Department of PathologyA. C. Camargo Cancer HospitalSão PauloBrazil
  4. 4.Department of Head and Neck Surgery and OtorhinolaryngologyA.C. Camargo Cancer HospitalSão PauloBrazil

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