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Cytotoxicity of NF-kappaB Inhibitors Bay 11-7085 and Caffeic Acid Phenethyl Ester to Ramos and Other Human B-lymphoma Cell Lines

Cytotoxicity of NF-kappaB Inhibitors Bay 11-7085 and Caffeic Acid Phenethyl Ester to Ramos and Other Human B-lymphoma Cell Lines

Nir Berger, Hannah Ben Bassat, Benjamin Y Klein, Reuven Laskov

Exp Hematol. 2007 Oct;35(10):1495-509.

PMID: 17889719

Abstract:

Objective:
The viability of normal and malignant B-cells was shown to depend on the constitutive activation of the nuclear factor (NF)- kappaB pathway. Thus, attempts to find efficient inhibitors of NF-kappaB play a central role in the search for novel anti-B lymphoma therapies. We studied the effects of two NF-kappaB inhibitors, Bay 11-7085 (BAY) and caffeic acid phenethyl ester (CAPE), on the viability of B-lymphoma cell lines.
Methods:
We investigated the mechanism(s) of the cytotoxic effect of the NF-kappaB inhibitors, BAY, and CAPE on human-lymphoma and nonhematological cell lines.
Results:
BAY and CAPE were shown to kill Ramos-Burkitt's lymphoma cells with IC(50) values of 0.7 microM and 4 microM, respectively. The rapid killing by BAY (h) vs the slower killing by CAPE (1-3 days), and their differential effects on the stages of the cell cycle, indicated that these drugs induce killing by different mechanisms. BAY and CAPE induced a loss of the cytoplasmic compartment and generated pyknotic nuclei, which lacked nuclear or nucleosomal fragmentation, features characteristic of necrosis rather than apoptosis. BAY also induced a rapid loss of the mitochondrial potential and rapid inhibition of p65 NF-kappaB binding to its kappaB motif without reducing the level of nuclear p65.
Conclusion:
Our results indicate that BAY causes a necrotic rather than apoptotic cell death, either through its effect on the NF-kappaB pathway and/or by affecting additional molecular targets. The high sensitivity of B-lymphoma cell lines to the cytotoxicity of BAY, justify further research to explore its potential therapeutic effect on human B lymphomas.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP196309769	Bay 11-7085		196309-76-9	Price

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