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Ceramide participates in lysosome-mediated cell death induced by type II anti-CD20 monoclonal antibodies.

Leukemia & lymphoma (2014-11-14)
Yuzhi Liu, Ling Shu, Jingjing Wu
ABSTRACT

Considering the variable and often modest therapeutic efficacy of rituximab for a substantial proportion of patients suffering from non-Hodgkin lymphomas (NHLs), various type II anti-CD20 monoclonal antibodies (mAbs) with excellent ability in inducing programmed cell death (PCD) are currently being developed for their enhanced therapeutic index. Although homotypic adhesion (HA) and lysosome leakage are proven to be of vital importance in type II mAb-induced PCD in NHL cells, the detailed relationship between them remains unclear. Herein, for the first time we discovered that improved intracellular ceramide level is an important mediator between HA and lysosome leakage in tositumomab-induced cell death. Further experimental results revealed that the generation of intracellular ceramide acts as the outcome of HA and major cause of lysosome leakage. The clarification of ceramide involvement in type II anti-CD20 mAb-induced PCD may provide new ideas on CD20-based immunotherapy against NHLs.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
碘化丙啶, ≥94.0% (HPLC)
Sigma-Aldrich
4-(二甲氨基)吡啶, ReagentPlus®, ≥99%
Sigma-Aldrich
N,N′-二环己基碳二亚胺, 99%
Sigma-Aldrich
碘化丙啶 溶液, solution (1.0 mg/ml in water)
Sigma-Aldrich
N,N′-二环己基碳二亚胺 溶液, 1.0 M in methylene chloride
Sigma-Aldrich
N-Acetyl-D-penicillamine, for HPLC derivatization, ≥99.0% (T)
Sigma-Aldrich
2-萘乙酸, 99%
Sigma-Aldrich
二环己基碳二亚胺 溶液, 60 wt. % in xylenes
Sigma-Aldrich
4-(二甲氨基)吡啶 溶液, 0.5 M in THF