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Expression of beta2 integrins and macrophage-associated antigens in meningeal tumours

J F Mosnier1, A G Perret, J Y Scoazec

  • 1Service d' Anatomie Pathologique, Hôpital de Bellevue, Saint-Etienne, France. jean.francois.mosnier@wanadoo.fr

Virchows Archiv : an International Journal of Pathology
|February 7, 2001
PubMed

Insights

Meningiomas express leukocyte integrins and macrophage antigens, suggesting a unique cellular phenotype. Beta2 integrin expression may attract immune cells to meningioma tumors.

Area of Science:

  • Immunology
  • Oncology
  • Neuropathology

Background:

  • Meningiomas are primary tumors of the meninges.
  • Understanding meningioma cell phenotype is crucial for diagnosis and treatment.
  • Leukocyte integrins and macrophage markers are key immune cell components.

Purpose of the Study:

  • To assess the expression of leukocyte integrins and macrophage-associated antigens in various meningioma subtypes.
  • To compare antigen expression between benign and atypical/anaplastic meningiomas.
  • To investigate the potential role of beta2 integrins in immune cell infiltration.

Main Methods:

  • Immunohistochemical staining of frozen meningioma sections.
  • Antibodies against leukocyte integrins (beta2, alpha subunits), CD68, CD14, CD2, CD1a, DRC1, and CD34 were used.
  • Semi-quantitative evaluation of antigen expression and Ki67 proliferation index counting.

Main Results:

  • Beta2 integrin was expressed in all 14 meningiomas, often with an alpha-integrin subunit.
  • KP1 (CD68) was consistently expressed in meningiomas but not other meningeal tumors.
  • CD34 was found in fibrous meningiomas, hemangiopericytomas, and SFTs; macrophage density exceeded T lymphocyte density.
  • No significant difference in beta2 expression or immune cell density between benign and atypical/anaplastic meningiomas.

Conclusions:

  • Meningiomas exhibit a distinct phenotype characterized by leukocyte antigen expression.
  • Beta2 integrin expression may facilitate the recruitment of immunocompetent cells into the tumor stroma.
  • Further research is needed to elucidate the functional implications of these findings.

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