NCIt definition : Any substance that inhibits the proteasome complex, an enzyme complex responsible
for degradation of ubiquitinated proteins. Inhibition of proteasome activity and ubiquitin-proteasome
mediated proteolysis results in an accumulation of poly-ubiquitinated proteins, which
may result in the disruption of cellular processes, cell cycle arrest, the induction
of apoptosis, and the inhibition of tumor growth and angiogenesis.;
Alternative definition : NCI-GLOSS: A drug that blocks the action of proteasomes. A proteasome is a large protein
complex that helps destroy other cellular proteins when they are no longer needed.
Proteasome inhibitors are being studied in the treatment of cancer.;