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Growth Factor Responses and Protooncogene Expression of Murine Mesothelial Cell Lines Derived from Asbestos-Induced Mesotheliomas

Department of Pathology and Laboratory Medicine, Brown University School of Medicine, Providence, Rhode Island 02912

Charles A. Vaslet

Department of Pathology and Laboratory Medicine, Brown University School of Medicine, Providence, Rhode Island 02912

Norma J. Messier

Department of Pathology and Laboratory Medicine, Brown University School of Medicine, Providence, Rhode Island 02912

Agnes B. Kane

Department of Pathology and Laboratory Medicine, Brown University School of Medicine, Providence, Rhode Island 02912

Repeated intraperitoneal injections of crocidolite asbestos fibers induced diffuse malignant mesotheliomas in mice. A series of mesothelial cell lines was isolated from mice at different stages in the development of these tumors. The cell lines isolated from mice with mesotheliomas recapitulated their growth pattern in vivo and were tumorigenic when reinjected into syngeneic mice. Similar to human mesothelial cells, growth of the murine cell lines was stimulated by epidermal growth factor. Reactive mesothelial cells and mesotheliomas expressed the receptor for this growth factor. Crocidolite asbestos fibers have been reported to induce sustained expression of the c-fos and c-jun protooncogenes in rat pleural mesothelial cells in vitro (Heintz et al, Proc. Natl. Acad. Sci. USA 90: 3299-303, 1993). Human malignant mesotheliomas have been shown to express c-fos in situ (Ramael et al, Histol. Histopathol. 10: 639-643, 1995). Two of the cell lines derived from highly invasive murine mesotheliomas overexpressed c-fos and c-jun. This murine model recapitulates the histopathology, growth factor responses, and protooncogene expression of human malignant mesotheliomas.

Key Words: Fibers • c-fos • c-jun • epidermal growth factor • platelet-derived growth factor

Toxicologic Pathology, Vol. 25, No. 6, 565-573 (1997)
DOI: 10.1177/019262339702500605


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