Proteasome Cancer Research Results

Proteasome, Proteasome: Click to Expand ⟱
Source: HalifaxProj (inhibit)
Type:
The proteasome is a crucial component of the cellular machinery responsible for degrading ubiquitinated proteins, which are proteins tagged for destruction. This process is essential for maintaining cellular homeostasis, regulating the cell cycle, and controlling various signaling pathways.
Many cancer cells exhibit increased expression of proteasome subunits. This upregulation can enhance the proteasome's capacity to degrade proteins, including those that regulate cell cycle progression and apoptosis, thereby promoting tumor growth and survival.

Proteasome inhibitors act by blocking the activity of the proteasome, a crucial cellular complex responsible for degrading most intracellular proteins.
-The proteasome is responsible for degrading ubiquitin-tagged proteins, including misfolded, damaged, or regulatory proteins. By inhibiting the proteasome’s function, these proteins accumulate within the cell.
-Accumulated proteins can lead to increased cellular stress, particularly in the endoplasmic reticulum (ER) where misfolded proteins build up. This stress can trigger the unfolded protein response (UPR), which, if unresolved, may lead to apoptosis (programmed cell death).
-It is well known that ROS plays an important role in proteasome inhibition-induced cell death.

Inhibitor Drugs: bortezomib (Velcade) and carfilzomib

Natural Product Inhibitors:
-Gambogic Acid:
-Lactacystin: Origin: Isolated from the bacterium Streptomyces lactacystinaeus.
-Epoxomicin is a highly selective and potent inhibitor of the proteasome. Its structure has informed the design of synthetic drugs such as carfilzomib.
-Syringolin A
-Tyropeptins
-EGCG
-Withania somnifera (commonly known as Ashwagandha).
-Celastrol
Origin: Derived from plants of the Tripterygium genus (commonly known as Thunder God Vine).
Scientific Papers found: Click to Expand⟱
5171- Ash,    The tumor proteasome is a primary target for the natural anticancer compound Withaferin A isolated from "Indian winter cherry"
- vitro+vivo, Pca, LNCaP - vitro+vivo, Pca, PC3
Proteasome↓, inhibition of the proteasomal chymotrypsin-like activity by WA in vivo is responsible for, or contributes to, the antitumor effect of this ancient medicinal compound.
BAX↑, WA results in accumulation of ubiquitinated proteins and three proteasome target proteins (Bax, p27, and IkappaB-alpha) accompanied by androgen receptor protein suppression (in androgen-dependent LNCaP cells) and apoptosis induction.
p27↑,
AR↓,
TumCG↓, Treatment of human prostate PC-3 xenografts with WA for 24 days resulted in 70% inhibition of tumor growth in nude mice

5175- Ash,    Withaferin A Induces Proteasome Inhibition, Endoplasmic Reticulum Stress, the Heat Shock Response and Acquisition of Thermotolerance
- in-vitro, Cerv, CCL-102
Inflam↓, In the present study, withaferin A (WA), a steroidal lactone with anti-inflammatory and anti-tumor properties, inhibited proteasome activity
AntiTum↑,
Proteasome↓,
ER Stress↑, and induced endoplasmic reticulum (ER) and cytoplasmic HSP accumulation in Xenopus laevis A6 kidney epithelial cells.
HSPs↑,
GRP94↑, WA induced the accumulation of HSPs including ER chaperones, BiP and GRP94, as well as cytoplasmic/nuclear HSPs, HSP70 and HSP30.
Akt↑, WA-induced an increase in the relative levels of the protein kinase, Akt,
eff↑, WA acted synergistically with mild heat shock to enhance HSP70 and HSP30 accumulation to a greater extent than the sum of both stressors individually
HSP70/HSPA5↑, WA Induced Accumulation of BiP, GRP94, HSP70 and HSP30

2013- CAP,    Capsaicin, a component of red peppers, inhibits the growth of androgen-independent, p53 mutant prostate cancer cells
- in-vitro, Pca, PC3 - in-vitro, Pca, LNCaP - in-vitro, Pca, DU145 - in-vivo, NA, NA
TumCP↓, profound antiproliferative effect on prostate cancer cells, inducing the apoptosis of both androgen receptor (AR)-positive (LNCaP) and -negative (PC-3, DU-145) prostate cancer cell lines
P53↑, increase of p53, p21, and Bax
P21↑,
BAX↑,
PSA↓, Capsaicin down-regulated the expression of not only prostate-specific antigen (PSA) but also AR
AR↓,
NF-kB↓, Capsaicin inhibited NF-kappa activation by preventing its nuclear migration
Proteasome↓, capsaicin inhibits proteasome activity which suppressed the degradation of IkappaBalpha
TumVol↓, Capsaicin, when given orally, significantly slowed the growth of PC-3 prostate cancer xenografts
eff∅, However, our experiments using the three TRVP1-inhibitors capsazepine, ruthenium red, and SB366791, did not show any attenuation of the inhibitory activity of capsaicin.

5012- DSF,  Cu,    Advancing Cancer Therapy with Copper/Disulfiram Nanomedicines and Drug Delivery Systems
ROS↑, DSF’s anticancer mechanism is primarily due to its generating reactive oxygen species, inhibiting aldehyde dehydrogenase (ALDH) activity inhibition, and decreasing the levels of transcriptional proteins
ALDH↓,
TumCP↓, DSF also shows inhibitory effects in cancer cell proliferation, the self-renewal of cancer stem cells (CSCs), angiogenesis, drug resistance, and suppresses cancer cell metastasis.
CSCs↓,
angioG↓,
TumMeta↓,
DNAdam↑, anti-cancer mechanism of DSF/Cu (II) may be mediated by the regulation of reactive oxygen species (ROS), enzyme activity regulation, induction of DNA damage, proteasome inhibition, and transcription factors
Proteasome↓,
SOD1↓, The complex of DSF and Cu (II)has been reported to inhibit the enzyme superoxide dismutase 1 (SOD1), one of the major enzymesthat mitigates oxidative damage in melanoma cells
GSR↓, The inhibition of Glutathione reductase (GSR) inhibition by DSF disrupts glutathione GSH redox cycling, producing an accumulation of oxidized glutathione (GSSG) and a lower GSH/GSSG ratio, producing an increase in ROS level
ox-GSSG↑,
GSH/GSSG↓,
MMP↓, DSF induces the disruption of the mitochondrial membrane potential and cause apoptosis in human melanoma cell lines
Akt↓, induced the apoptosis of erbB2-positive breast cancer cells by inhibiting AKT, cyclin D1, and NFκB signaling
cycD1/CCND1↓,
NF-kB↓,
CSCs↓, In hepatocellular carcinoma, DSF decreases CSCs by inhibiting the p38 mitogen-activated protein kinase (MAPK) pathway [118].
MAPK↓,
angioG↓, Thus, the inhibition of DSF/Cu (II) in CSCs decrease angiogenesis.
DrugR↓, DSF/Cu (II) overcomes drug resistance via targeting the proteasome, epithelial–mesenchymal transition (EMT), P-gp, CSC activity
EMT↓,
Vim↓, By downregulating associated proteins such as Vimentin, DSF/Cu (II) inhibits the EMT, which consequently overcomes the paclitaxel resistance of prostate and lung cancer
BioAv↑, The use of these nanoparticle-based formulations can increase the accumulation of DSF at the target site, thereby reducing the toxic effects on healthy tissues and improving the therapeutic index.
eff↑, In clinical trials, DSF is provided orally, but Cu (II) is critical for the efficacy of DSF

1960- GamB,  Vem,    Calcium channel blocker verapamil accelerates gambogic acid-induced cytotoxicity via enhancing proteasome inhibition and ROS generation
- in-vitro, Liver, HepG2 - in-vitro, AML, K562
Proteasome↓, GA is a potent proteasome inhibitor, with anticancer efficiency comparable to bortezomib but much less toxicity
eff↑, either GA (0.3, 0.4, 0.5 uM) or Ver (20, 30, 40 uM) only slightly decreased cell viability in HepG2 cells after 72 h, while the combination of GA and Ver dramatically decreased the HepG2 cell viability
Casp↑, (ii) a combinational treatment with Ver and GA induces caspase activation, endoplasmic reticulum (ER) stress and reactive oxygen species (ROS) production;
ER Stress↑,
ROS↑,
eff↑, GA at 0.5 lM or Ver at 30 lM alone did not alter CHOP protein expression levels after 48 h treatment the combination of GA and Ver markedly increased CHOP


Showing Research Papers: 1 to 5 of 5

* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 5

Pathway results for Effect on Cancer / Diseased Cells:


Redox & Oxidative Stress ⓘ

GSH/GSSG↓, 1,   GSR↓, 1,   ox-GSSG↑, 1,   ROS↑, 2,   SOD1↓, 1,  

Mitochondria & Bioenergetics ⓘ

MMP↓, 1,  

Cell Death ⓘ

Akt↓, 1,   Akt↑, 1,   BAX↑, 2,   Casp↑, 1,   MAPK↓, 1,   p27↑, 1,   Proteasome↓, 5,  

Protein Folding & ER Stress ⓘ

ER Stress↑, 2,   GRP94↑, 1,   HSP70/HSPA5↑, 1,   HSPs↑, 1,  

DNA Damage & Repair ⓘ

DNAdam↑, 1,   P53↑, 1,  

Cell Cycle & Senescence ⓘ

cycD1/CCND1↓, 1,   P21↑, 1,  

Proliferation, Differentiation & Cell State ⓘ

ALDH↓, 1,   CSCs↓, 2,   EMT↓, 1,   TumCG↓, 1,  

Migration ⓘ

TumCP↓, 2,   TumMeta↓, 1,   Vim↓, 1,  

Angiogenesis & Vasculature ⓘ

angioG↓, 2,  

Immune & Inflammatory Signaling ⓘ

Inflam↓, 1,   NF-kB↓, 2,   PSA↓, 1,  

Hormonal & Nuclear Receptors ⓘ

AR↓, 2,  

Drug Metabolism & Resistance ⓘ

BioAv↑, 1,   DrugR↓, 1,   eff↑, 4,   eff∅, 1,  

Clinical Biomarkers ⓘ

AR↓, 2,   PSA↓, 1,  

Functional Outcomes ⓘ

AntiTum↑, 1,   TumVol↓, 1,  
Total Targets: 41

Pathway results for Effect on Normal Cells:


Total Targets: 0

Scientific Paper Hit Count for: Proteasome, Proteasome
2 Ashwagandha(Withaferin A)
1 Capsaicin
1 Disulfiram
1 Copper and Cu NanoParticles
1 Gambogic Acid
1 verapamil
Query results interpretion may depend on "conditions" listed in the research papers.
Such Conditions may include : 
  -low or high Dose
  -format for product, such as nano of lipid formations
  -different cell line effects
  -synergies with other products 
  -if effect was for normal or cancerous cells

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