Regular Article

British Journal of Cancer (2000) 83, 880–886. doi:10.1054/bjoc.2000.1384 www.bjcancer.com
Published online 5 September 2000

Expression of inducible nitric oxide synthase in healthy pleura and in malignant mesothelioma

Y Soini1, K Kahlos1, A Puhakka1, E Lakari1, M Säily1, P Pääkkö1 and V Kinnula1

1Departments of Pathology and Internal Medicine, University of Oulu and Oulu University Hospital, Oulu, Finland

Received 14 January 2000; Revised 28 April 2000; Accepted 8 June 2000.

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Abstract

In this study we investigated the immunohistochemical expression of inducible nitric oxide synthase (iNOS) in a set of normal pleural mesothelial tissues, malignant mesotheliomas, mesothelioma cell lines and metastatic pleural adenocarcinomas. Furthermore, the expression of mRNA was assessed in four malignant mesothelioma cell lines in culture. Apoptosis and vascular density in malignant mesotheliomas was assessed by the TUNEL method and by immunohistochemistry with an antibody against FVIII-related antigen. Immunohistochemically mesothelial cells in non-neoplastic healthy pleural tissues were mostly negative for iNOS. Positivity for iNOS was observed in 28/38 (74%) and 24/25 (96%) of malignant mesotheliomas and metastatic pleural adenocarcinomas, respectively. Epithelial and mixed mesotheliomas expressed more often strong iNOS immunoreactivity compared to the sarcomatoid subtype (P = 0.023). Moreover, metastatic adenocarcinomas expressed more often iNOS positivity than mesotheliomas (P = 0.021). Experiments with the cell lines confirmed that malignant mesothelioma cells are capable of synthesizing iNOS. No significant association was found between iNOS expression and apoptosis or vascular density in malignant mesotheliomas. The higher expression of iNOS in the epithelial subtype of mesothelioma and pleural metastatic adenocarcinoma might be due to an increased sensitivity of these cell types to cytokine-mediated iNOS upregulation. The strong expression of iNOS suggests a putative role for NO in the growth and progression of these tumours. © 2000 Cancer Research Campaign

Keywords:

mesothelioma, NOS, pleura, apoptosis, angiogenesis

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