Angiodestruction and tissue necrosis of skin-involving CD56+NK/T-cell lymphoma are influenced by expression of cell adhesion molecules and cytotoxic granule and apoptosis-related proteins

We compared the expression of cell adhesion molecules (CAMs), cytotoxic gra nule proteins, and apoptosis-related proteins by immunohistology and in sit u terminal deoxynucleotidyl transferase-mediated digoxigenin-dUTP nick end labeling (TUNEL) of 10 cases of cutaneous CD56+NK/T cell lymphoma with and 6 cases without angiodestruction. Lymphoma cells in cases with angiodestruc tion frequently expressed CAMs CD2, CD11a, and CD49d and their ligands CD58 , CD54, and CD106 and were positive for CD122 and cytotoxic granule protein s TIA1, perform and granzyme B. Lymphoma cells in cases without angiodestru ction mostly were negative for CD2, CD58, CD54, CD106, and TIA1 and weakly positive for perforin and granzyme B. In the TUNEL method, mean apoptotic i ndices (AI) for cases with angiodestruction showed a higher percentage than those without angiodestruction. CD95L, CD95, apoptosis-induced cysteine pr otease CPP32, apoptosis-promoting protein Bax, and proliferating marker (MI B1) frequently were positive in the lymphoma cells of cases with angiodestr uction, but there was no expression of apoptosis-inhibitor protein Bcl2. In most cases without angiodestruction, lymphoma cells were positive for CD95 L and Bax and negative for CD95, CPP32, and MIB1. CAMs and the 3 cytotoxic granule proteins and an apoptosis pathway might be important factors in the paracrine and autocrine mechanisms of tissue necrosis in cutaneous CD56+NK /T cell lymphoma.