Receptor activator of NF-kappaB ligand (RANKL) is expressed in chondroblastoma: possible involvement in osteoclastic giant cell recruitment

Mol Pathol. 2003 Apr;56(2):116-20. doi: 10.1136/mp.56.2.116.

Abstract

Aims: Chondroblastoma is a rare, locally aggressive bone tumour that causes osteolytic destruction at the epiphyseal end of the affected bone. It is possible that tumour cells may stimulate osteoclastogenesis and osteolytic destruction through the production of receptor activator of NF-kappaB ligand (RANKL), which is a key molecule essential for regulating osteoclast formation and activity. Therefore, the expression of RANKL at both the mRNA and the protein level was investigated in chondroblastoma tumour tissue obtained from patients.

Methods: The expression of RANKL gene transcripts was analysed by the reverse transcription-polymerase chain reaction (RT-PCR), and the cellular localisation of RANKL mRNA and protein was demonstrated by means of in situ hybridisation and immunohistochemistry.

Results: RT-PCR analysis indicated that RANKL mRNA was present in all chondroblastoma specimens and normal cancellous bone samples, but not in normal articular cartilage and chondrosarcoma tissues. In contrast, gene transcripts of osteoprotegerin (OPG), the decoy receptor of RANKL, were detected in all types of tissues. The chondroid origin of neoplastic mononuclear cells in chondroblastoma was confirmed by positive S-100 immunohistochemical staining. Both RANKL mRNA and protein were exclusively expressed in these neoplastic mononuclear cells.

Conclusions: These findings suggest that RANKL may be involved in the tumour cell induced recruitment of osteoclast-like cells and consequent osteolytic bone destruction in chondroblastoma.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Bone Neoplasms / metabolism*
  • Bone Neoplasms / pathology
  • Carrier Proteins / genetics
  • Carrier Proteins / metabolism*
  • Carrier Proteins / physiology
  • Child
  • Chondroblastoma / metabolism*
  • Chondroblastoma / pathology
  • Female
  • Gene Expression
  • Humans
  • Immunoenzyme Techniques
  • Ligands
  • Male
  • Membrane Glycoproteins / genetics
  • Membrane Glycoproteins / metabolism*
  • Membrane Glycoproteins / physiology
  • NF-kappa B / metabolism
  • Neoplasm Proteins / genetics
  • Neoplasm Proteins / metabolism*
  • Neoplasm Proteins / physiology
  • Osteoclasts / physiology
  • RANK Ligand
  • RNA, Messenger / genetics
  • RNA, Neoplasm / genetics
  • Receptor Activator of Nuclear Factor-kappa B
  • Reverse Transcriptase Polymerase Chain Reaction

Substances

  • Carrier Proteins
  • Ligands
  • Membrane Glycoproteins
  • NF-kappa B
  • Neoplasm Proteins
  • RANK Ligand
  • RNA, Messenger
  • RNA, Neoplasm
  • Receptor Activator of Nuclear Factor-kappa B
  • TNFRSF11A protein, human
  • TNFSF11 protein, human