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Simian virus 40 is not a cofactor in the pathogenesis of environmentally induced malignant pleural mesothelioma in
Abstract:
Malignant pleural mesothelioma (MPM) continues to be a public health problem in Turkey, where exposure to environmental asbestos and fibrous zeolite (erionite) is the main cause of the disease. However, less than 5% of exposed individuals develop the disease, and numerous cases of MPM are documented each year in which the patient has no known exposure to either of these minerals. Thus, additional unknown factors act independently or as co-carcinogens in the development of MPM. Simian Virus 40 (SV40) may act as a co-carcinogen with asbestos in the pathogenesis of occupationally induced MPM. To determine if SV40 plays a role in the development of MPM in Turkey, we used PCR analysis to investigate if SV40 DNA sequences were present in 29 mesothelioma specimens from patients previously exposed to asbestos or erionite. PCR analysis revealed that all 29 tissue specimens from our patients did not contain SV40 DNA. 15 specimens from patients suffering from tuberculosis pleuresy were also SV40 negative. One mesothelioma and one osteosarcoma from Italy tested positive for SV40. Our results indicate that inorganic fibers, asbestos, and erionite remain the only known causal factors of mesothelioma in Turkey. The absence of SV40 in Turkish specimens and its presence in Italian specimens may be related to the fact that SV40-contaminated vaccines were not administered in Turkey.
Insights
Simian Virus 40 (SV40) was not found in Turkish malignant pleural mesothelioma (MPM) cases, suggesting inorganic fibers like asbestos are the primary cause in Turkey. This contrasts with findings in Italy, possibly due to vaccine history.
Area of Science:
- Oncology
- Environmental Health
- Virology
Background:
- Malignant pleural mesothelioma (MPM) is a significant health concern in Turkey, primarily linked to asbestos and erionite exposure.
- While exposure is common, only a fraction of individuals develop MPM, indicating other contributing factors.
- Simian Virus 40 (SV40) is investigated as a potential co-carcinogen in asbestos-related MPM.
Purpose of the Study:
- To investigate the presence of Simian Virus 40 (SV40) DNA in Turkish mesothelioma specimens.
- To determine if SV40 plays a role in the pathogenesis of MPM in Turkey, particularly in relation to asbestos and erionite exposure.
Main Methods:
- Polymerase Chain Reaction (PCR) analysis was employed to detect SV40 DNA sequences.
- 29 mesothelioma tissue specimens from patients with known asbestos or erionite exposure were analyzed.
- Control specimens included 15 pleural effusion samples from tuberculosis patients and samples from Italy.
Main Results:
- SV40 DNA was not detected in any of the 29 Turkish mesothelioma specimens.
- SV40 DNA was also absent in the 15 tuberculosis pleurisy specimens.
- SV40 DNA was detected in one mesothelioma and one osteosarcoma specimen from Italy.
Conclusions:
- Inorganic fibers, specifically asbestos and erionite, are identified as the sole known causal agents for mesothelioma in Turkey.
- The absence of SV40 in Turkish MPM cases, contrasted with its presence in Italian cases, may be linked to differing SV40-contaminated vaccine administration histories.
- Further research is needed to understand the specific co-carcinogenic mechanisms in MPM development.