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Loss of Mesothelin Expression by Mesothelioma Cells Grown In Vitro Determines Sensitivity to Anti-Mesothelin Immunotoxin SS1P.
MedLine Citation:
PMID:  23225411     Owner:  NLM     Status:  In-Data-Review    
MATERIALS AND METHODS: Cell cultures were established from ascites or pleural effusion of 6 peritoneal and 3 pleural mesothelioma patients, respectively. These cells were evaluated for mesothelin expression by immunohistochemistry and flow cytometry.
RESULTS: Although mesothelin was highly expressed in tumor biopsies of all patients, only 3 out of 9 malignant effusions from these patients when grown in short-term culture showed strong mesothelin positivity by IHC. By flow cytometry, the number of mesothelin sites per cell was variable ranging from 580 to 210,000 sites/cell. Cells with strong mesothelin expression by IHC and increased number of mesothelin sites/cell were sensitive to SS1P.
CONCLUSIONS: Most mesothelioma tumors loose mesothelin when grown in vitro and the sensitivity of these cells to SS1P is dependent on the number of mesothelin sites/cell.
Jingli Zhang; Shuo Qiu; Yujian Zhang; Maria Merino; Patricia Fetsch; Itzhak Avital; Armando Filie; Ira Pastan; Raffit Hassan
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Anticancer research     Volume:  32     ISSN:  1791-7530     ISO Abbreviation:  Anticancer Res.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8102988     Medline TA:  Anticancer Res     Country:  Greece    
Other Details:
Languages:  eng     Pagination:  5151-8     Citation Subset:  IM    
Laboratory of Molecular Biology, National Cancer Institute, 37 Convent Drive, Room 5116, Bethesda, MD 20892-4264, U.S.A.
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