Asbestos Research Today is a free monthly online journal that collates and summarizes the latest research about Asbestos, including details on mesothelioma, lung disease, dangers, effects, risks.

SV40-dependent AKT activity drives mesothelial cell transformation after asbestos exposure.

Cacciotti P, Barbone D, Porta C, Altomare DA, Testa JR, Mutti L, Gaudino G

Department of Medical Sciences, University of Piemonte Orientale A. Avogadro, Novara, Italy.

Human malignant mesothelioma is an aggressive cancer generally associated with exposure to asbestos, although SV40 virus has been involved as a possible cofactor by a number of studies. Asbestos fibers induce cytotoxicity in human mesothelial cells (HMC), although cell survival activated by key signaling pathways may promote transformation. We and others previously reported that SV40 large T antigen induces autocrine loops in HMC and malignant mesothelioma cells, leading to activation of growth factor receptors. Now we show that SV40 induces cell survival via Akt activation in malignant mesothelioma and HMC cells exposed to asbestos. Consequently, prolonged exposure to asbestos fibers progressively induces transformation of SV40-positive HMC. As a model of SV40/asbestos cocarcinogenesis, we propose that malignant mesothelioma originates from a subpopulation of transformed stem cells and that Akt signaling is a novel therapeutic target to overcome malignant mesothelioma resistance to conventional therapies.

Published 16 June 2005 in Cancer Res, 65(12): 5256-62.
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