A unique proteomic profile on surface IgM ligation in unmutated chronic lymphocytic leukemia

作者：Perrot Aurore; Pionneau Cedric; Nadaud Sophie; Davi Frederic; Leblond Veronique; Jacob Frederic; Merle Beral Helene; Herbrecht Raoul; Bene Marie Christine; Gribben John G; Bahram Seiamak^*; Vallat Laurent

来源：Blood, 2011, 118(4): E1-E15.

DOI：10.1182/blood-2011-02-335125

Chronic lymphocytic leukemia (CLL) is characterized by a highly variable clinical course with 2 extreme subsets: indolent, ZAP70(-) and mutated immunoglobulin heavy chain gene (M-CLL); and aggressive, ZAP70(+) and unmutated immunoglobulin heavy chain (UM-CLL). Given the long-term suspicion of antigenic stimulation as a primum movens in the disease, the role of the B-cell receptor has been extensively studied in various experimental settings; albeit scarcely in a comparative dynamic proteomic approach. Here we use a quantitative 2-dimensional fluorescence difference gel electrophoresis technology to compare 48 proteomic profiles of the 2 CLL subsets before and after anti-IgM ligation. Differentially expressed proteins were subsequently identified by mass spectrometry. We show that unstimulated M-and UM-CLLcells display distinct proteomic profiles. Furthermore, anti-IgM stimulation induces a specific proteomic response, more pronounced in the more aggressive CLL. Statistical analyses demonstrate several significant protein variations according to stimulation conditions. Finally, we identify an intermediate form of M-CLL cells, with an indolent profile (ZAP70(-)) but sharing aggressive proteomic profiles alike UM-CLL cells. Collectively, this first quantitative and dynamic proteome analysis of CLL further dissects the complex molecular pathway after B-cell receptor stimulation and depicts distinct proteomic profiles, which could lead to novel molecular stratification of the disease. (Blood. 2011;118(4):e1-e15)

• 出版日期2011-7-28