Abstract
We previously established that NF-κB DNA binding activity is required for Sindbis Virus (SV)-induced apoptosis. To investigate whether SV induces nuclear translocation of NF-κB via the proteasomal degradation pathway, we utilized MG132, a peptide aldehyde inhibitor of the catalytic subunit of the proteasome. 20 μM MG132 completely abrogated SV-induced NF-κB nuclear activity at early time points after infection. Parallel measures of cell viability 48 h after SV infection revealed that 20 μM MG132 induced apoptosis in uninfected cells. In contrast, a lower concentration of MG132 (200 nM) resulted in partial inhibition of SV-induced nuclear NF-κB activity and inhibition of SV-induced apoptosis without inducing toxicity in uninfected cells. The specific proteasomal inhibitor, lactacystin, also inhibited SV-induced death. Taken together, these results suggest that the pro-apoptotic and anti-apoptotic functions of peptide aldehyde proteasome inhibitors such as MG-132 depend on the concentration of inhibitor utilized and expand the list of stimuli requiring proteasomal activation to induce apoptosis to include viruses.
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Edited by B. A. Osborne
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Lin, KI., Baraban, J. & Ratan, R. Inhibition versus induction of apoptosis by proteasome inhibitors depends on concentration. Cell Death Differ 5, 577–583 (1998). https://doi.org/10.1038/sj.cdd.4400384
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DOI: https://doi.org/10.1038/sj.cdd.4400384
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