Review Article

The Role of Proteasome Inhibition in Nonsmall Cell Lung Cancer

Table 1

Antitumor and autoprotective mechanisms triggered by proteasome inhibition. Possible antitumor mechanisms of proteasome inhibitors.

 (i) Accumulation of p53, p21, and p27
 (ii) Differential effects on pro- and antiapoptotic members of Bcl-2 family
 (iii) Downregulation of XIAP and survivins
 (iv) Inhibition of inducible NF-κB activity
 (v) Accumulation of misfolded proteins and endoplasmic reticulum stress
 (vi) Induction of oxidative stress
 (vii) Activation of bone morphogenetic protein signaling
 (viii) Inhibition of protein translation
 (ix) Inhibition of telomerase activity
 (x) Downregulation of PI3 K/Akt signaling
 (xi) Upregulation of death receptor
 (xii) Histone acetylation
 (xiii) Repression of E2F
 (xiv) Inhibition of IL-6-mediated signaling
 (xv) Suppression of FoxO and FoxMl proteins
 (xvi) Tubulin stabilization
 (xvii) Induction of mitotic catastrophe
 (xviii) Inhibition of epithelial-mesenchymal transition
 (xix) Inhibition of angiogenesis
 (xx) Immunosensitization of cancer cells to the cytotoxicity of lymphocytes
 (xxi) Increased genomic instability after exposure to ionizing radiation
 (xxii) Overcoming multidrug resistance by inhibition of pglycoprotein

Autoregulatory mechanisms against proteasome inhibition
 (i) Induction of macroautophagy
 (ii) Activation of constitutive NF-κB activity
 (iii) Activation of EGFR signaling
 (iv) Stat3 phosphorylation
 (v) Akt phosphorylation
 (vi) Induction of hsp72 and AKR1B10
 (vii) Upregulation of glutathione synthesis

Adapted from Wu et al. [3].