Abstract
The ubiquitin-proteasome system (UPS) is a highly complex protein network that maintains proteostasis and cell viability through the targeted and timely turnover of selected substrates. The proteasome serves as the catalytic core of the UPS to precisely recognize and efficiently execute the rapid ATP-dependent removal of ubiquitinated proteins. Small-molecule pharmacologic inhibitors exploit the pivotal role of the proteasome in cellular metabolism as a molecular vulnerability in cancer cells to promote the selective cytotoxicity of tumor cells. Proteasome inhibitors (PIs) have yielded durable clinically responses that dramatically improve the survival of patients diagnosed with the invariably fatal hematologic malignancy multiple myeloma (MM). Success of the PI bortezomib in the treatment of the hematologic malignancy MM has emerged as the standard of care and catapulted the UPS into a position of prominence as a model system in cancer biology and drug development. However, advancement of PIs to improve the treatment of patients with solid tumors has been far more challenging and less successful. Clinical assessment of second-generation PIs progresses as well as pharmacologics to intervene at other points within the UPS is being explored for both hematologic and solid tumors. Agents to target non-proteolytic activities associated with the proteasome are emerging as are agents to inhibit Ub-binding proteins. New approaches to unravel the UPS should advance its utilization as a drug development platform in mechanism-based anticancer strategies that include PIs as monotherapy or in synergistic combinations that improve the outcome of patients with solid tumors.
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Abbreviations
- ATP:
-
Adenosine triphosphate
- CP:
-
Catalytic particle
- CR:
-
Complete response
- Ct-L:
-
Chymotryptic-like
- DLT:
-
Dose limiting toxicities
- EGFR:
-
Epidermal growth factor receptor
- ER:
-
Endoplasmic reticulum
- FDA:
-
Federal Drug Administration
- γ-IFN:
-
Gamma-interferon
- IL:
-
Interleukin
- IV:
-
Intravenous
- GTP:
-
Guanosine triphosphate
- kDA:
-
Kilodalton
- MM:
-
Multiple myeloma
- MTD:
-
Maximally tolerated dose
- NCI:
-
National Cancer Institute
- NF-κB:
-
Nuclear factor kappa B
- NSCLC:
-
Non-small cell lung cancer
- ORR:
-
Overall response rate
- PI:
-
Proteasome inhibitor
- RP:
-
Regulatory particle
- RCC:
-
Renal cell carcinoma
- TNF-α:
-
Tumor necrosis factor-α
- Ub:
-
Ubiquitin
- UPS:
-
Ubiquitin-proteasome system
- UPR:
-
Unfolded protein response
- US:
-
United States
- VEGFR:
-
Vascular endothelial growth factor receptor
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Ahmad, N., Anaissie, E., Malek, M.A.Y.A., Driscoll, J.J. (2014). Targeting the Proteasome Pathway for the Treatment of Solid Tumors. In: Dou, Q. (eds) Resistance to Proteasome Inhibitors in Cancer. Resistance to Targeted Anti-Cancer Therapeutics. Springer, Cham. https://doi.org/10.1007/978-3-319-06752-0_9
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