Expression of Smac/DIABLO in B-cell non-Hodgkin and Hodgkin lymphomas.
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| Abstract |
Inhibitor of apoptosis proteins (IAPs) are upregulated in cancers and suppress cell death, in part, through their ability to directly inhibit caspases. Inhibitor of apoptosis proteins are differentially expressed in B-cell lymphomas. The functions of some IAPs are counteracted by the cell death inducer, second mitochondrial-derived activator of caspases/direct IAP binding protein with low pI (Smac/DIABLO). In this study, we investigated the expression levels of Smac/DIABLO in 14 lymphoma cell lines by Western blot analysis. We also assessed 247 B-cell non-Hodgkin's lymphoma (NHL) and 40 Hodgkin's lymphoma (HL) tumors using immunohistochemical methods. Smac/DIABLO was expressed in most NHL and all HL cell lines. In NHL, Smac/DIABLO was expressed in 117 (47%) tumors and was differentially expressed in various NHL types. In most NHLs, from 29% to 68% of tumors were positive; however, Smac/DIABLO was not detected in small lymphocytic lymphoma/chronic lymphocytic leukemia and Burkitt lymphoma, and was rare in extranodal marginal zone B-cell lymphoma. In HL, Smac/DIABLO was positive in 25 (63%) tumors. Unlike NHL, all types of HL were positive for Smac/DIABLO, although nodular sclerosis was least often positive. The differential expression of Smac/DIABLO in NHLs suggests that apoptotic mechanisms are differentially involved in their pathogenesis. These results may also have implications for using Smac/DIABLO or its agonists as therapeutic agents.
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| Authors | Yongsheng Ren, Nalan Akyurek, Ellen Schlette, Georgios Z Rassidakis, L Jeffrey Medeiros |
| Journal | Human pathology (Hum Pathol) Vol. 37 Issue 11 Pg. 1407-13 (Nov 2006) ISSN: 0046-8177 [Print] United States |
| PMID | 16949641 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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