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Generation and Expansion of Primary, Malignant Pleural Mesothelioma Tumor Lines
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Expression of the nerve growth factor receptors TrkA and p75 in malignant mesothelioma

Ben Davidson1, Reuven Reich, Philip Lazarovici

  • 1Department of Pathology, The Norwegian Radium Hospital, Montebello N-0310 Oslo, University of Oslo, Oslo, Norway. bend@ulrik.uio.no

Lung Cancer (Amsterdam, Netherlands)
|April 16, 2004
PubMed

Insights

Nerve growth factor (NGF) receptors p75 and TrkA were studied in malignant mesothelioma (MM). TrkA receptor expression was frequent, especially in peritoneal MM, suggesting its role in tumor progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Malignant mesothelioma (MM) is an aggressive cancer.
  • Nerve growth factor (NGF) receptors, including p75 and TrkA, are implicated in cancer cell growth and survival.

Purpose of the Study:

  • To investigate the expression of p75 and activated TrkA receptors in malignant mesothelioma.
  • To determine if receptor expression differs between pleural and peritoneal MM, and between solid lesions and effusions.

Main Methods:

  • Immunohistochemistry was used to analyze p75 and phospho-TrkA (p-TrkA) expression in 81 MM specimens (biopsies and effusions).
  • Immunoblotting was performed on six effusions to confirm p-TrkA expression.

Main Results:

  • Activated TrkA (p-TrkA) membrane expression was frequent (81%), while p75 expression was less common (32%).
  • p-TrkA expression was significantly higher in peritoneal MM compared to pleural MM (P = 0.014).
  • p-TrkA expression was marginally higher in effusions, whereas p75 expression was higher in solid lesions.

Conclusions:

  • Frequent p-TrkA and lower p75 expression in MM align with the tumor's aggressive nature.
  • Enhanced p-TrkA expression in peritoneal MM and effusions suggests a significant role in disease biology and progression.

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