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Mouse model for mesothelioma reproduces human disease
Date:3/10/2008

Scientists have established a mouse model for human malignant mesothelioma (MM) that will provide valuable insight into cancer development and progression along with new directions for design of therapeutic strategies. The research, published by Cell Press in the March issue of Cancer Cell, may eventually lead to a substantially improved outlook for patients with this devastating disease.

MM is an aggressive cancer originating from the mesothelial lining of the pleural cavity. MM is associated with asbestos exposure and is characterized by a long latency period between exposure and disease onset. Chemotherapy can sometimes lead to improvement of overall survival but there is no cure for MM and patients often succumb from the disease within a year of diagnosis. There is an urgent need for experimental models of MM that can be used to not only study the onset and progression of the disease, but also to serve as a model to select new combination therapies and targeted agents, says study leader, Dr. Anton Berns, from The Netherlands Cancer Institute.

In humans, MM has been associated with genetic lesions that result in the loss of Neurofibromatosis type 2 (NF2) and genetic lesions affecting RB and P53 pathways. Dr. Berns team investigated whether a range of conditional single or compound mutations in the Nf2, p53 and Rb pathways within the mesothelial lining of the thoracic cavity would cause MM in mice.

The researchers found that the vast majority of mice with conditional Nf2;Ink4a/Arf and Nf2;p53 mutations developed MM after a short latency period. The mouse MM tumors, which could be followed noninvasively through the use of bioluminescence imaging, closely resembled human MM. Interestingly, Nf2;Ink4a/Arf knockout mice had a more invasive cancer when compared with Nf2;p53 knockout mice. The researchers went on to show that the loss of Ink4a makes a substantial contribution to the poor clinical outcome of murine MM.

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Contact: Cathleen Genova
cgenova@cell.com
617-397-2802
Cell Press
Source:Eurekalert

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