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| Curcumin is the main active ingredient in Tumeric. Member of the ginger family.Curcumin is a polyphenol extracted from turmeric with anti-inflammatory and antioxidant properties. - Has iron-chelating, iron-chelating properties. Ferritin. But still known to increase Iron in Cancer cells. - GSH depletion in cancer cells, exhaustion of the antioxidant defense system. But still raises GSH↑ in normal cells. - Higher concentrations (5-10 μM) of curcumin induce autophagy and ROS production - Inhibition of TrxR, shifting the enzyme from an antioxidant to a prooxidant - Strong inhibitor of Glo-I, , causes depletion of cellular ATP and GSH - Curcumin has been found to act as an activator of Nrf2, (maybe bad in cancer cells?), hence could be combined with Nrf2 knockdown Clinical studies testing curcumin in cancer patients have used a range of dosages, often between 500 mg and 8 g per day; however, many studies note that doses on the lower end may not achieve sufficient plasma concentrations for a therapeutic anticancer effect in humans. • Formulations designed to improve curcumin absorption (like curcumin combined with piperine, nanoparticle formulations, or liposomal curcumin) are often employed in clinical trials to enhance its bioavailability. -Note half-life 6 hrs. BioAv is poor, use piperine or other enhancers Pathways: - induce ROS production at high concentration. Lowers ROS at lower concentrations - ROS↑ related: MMP↓(ΔΨm), ER Stress↑, UPR↑, GRP78↑, Cyt‑c↑, Caspases↑, DNA damage↑, cl-PARP↑, HSP↓ - Lowers AntiOxidant defense in Cancer Cells: GSH↓ Catalase↓ HO1↓ GPx↓ but conversely is known as a NRF2↑ activator in cancer - Raises AntiOxidant defense in Normal Cells: ROS↓, NRF2↑, SOD↑, GSH↑, Catalase↑, - lowers Inflammation : NF-kB↓, COX2↓, p38↓, Pro-Inflammatory Cytokines : TNF-α↓, IL-6↓, IL-8↓ - inhibit Growth/Metastases : TumMeta↓, TumCG↓, EMT↓, MMPs↓, MMP2↓, MMP9↓, uPA↓, VEGF↓, NF-κB↓, CXCR4↓, SDF1↓, TGF-β↓, α-SMA↓, ERK↓ - reactivate genes thereby inhibiting cancer cell growth : HDAC↓, DNMT1↓, DNMT3A↓, EZH2↓, P53↑, HSP↓, Sp proteins↓, - cause Cell cycle arrest : TumCCA↑, cyclin D1↓, CDK2↓, CDK4↓, CDK6↓, - inhibits Migration/Invasion : TumCMig↓, TumCI↓, ERK↓, EMT↓, TOP1↓, TET1↓, - inhibits glycolysis /Warburg Effect and ATP depletion : HIF-1α↓, PKM2↓, cMyc↓, GLUT1↓, LDHA↓, HK2↓, PFKs↓, PDKs↓, HK2↓, ECAR↓, OXPHOS↓, GRP78↑, GlucoseCon↓ - inhibits angiogenesis↓ : VEGF↓, HIF-1α↓, Notch↓, FGF↓, PDGF↓, EGFR↓, Integrins↓, - inhibits Cancer Stem Cells : CSC↓, CK2↓, Hh↓, GLi1↓, CD133↓, CD24↓, β-catenin↓, n-myc↓, sox2↓, OCT4↓, - Others: PI3K↓, AKT↓, JAK↓, STAT↓, Wnt↓, β-catenin↓, AMPK↓, ERK↓, JNK, TrxR**, - Synergies: chemo-sensitization, chemoProtective, RadioSensitizer, RadioProtective, Others(review target notes), Neuroprotective, Cognitive, Renoprotection, Hepatoprotective, CardioProtective, - Selectivity: Cancer Cells vs Normal Cells |
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| TrxR is an enzyme that reduces Trx, allowing it to perform its reducing functions. It has been shown to have a role in cancer cell metabolism and survival. TrxR is overexpressed in various types of cancer, including breast, lung, colon, and prostate cancer. - Part of the thioredoxin system, which regulates reactive oxygen species (ROS). - TrxR is a major antioxidant systems that maintains the intracellular redox homeostasis. - Inhibition causes an increase in ROS. - TrxR is often upregulated in cancer cells to help manage increased oxidative stress, it is seen as a potential therapeutic target. Inhibiting TrxR may result in increased ROS in cancer cells, pushing them toward apoptosis. - TrxR is a selenoprotein—meaning it incorporates the trace element selenium in the form of the amino acid selenocysteine. TrxR inhibitors: -Piperlongumine -Withania somnifera (Ashwagandha) -Parthenolide -EGCG -Curcumin -Myricetin -Gambogic Acid |
| 1980- | CUR, | Rad, | Thioredoxin reductase-1 (TxnRd1) mediates curcumin-induced radiosensitization of squamous carcinoma cells |
| - | in-vitro, | Cerv, | HeLa | - | in-vitro, | Laryn, | FaDu |
| 1977- | CUR, | Synthesis and evaluation of curcumin analogues as potential thioredoxin reductase inhibitors |
| - | in-vitro, | BC, | MCF-7 | - | in-vitro, | Cerv, | HeLa | - | in-vitro, | Lung, | A549 |
| 1979- | CUR, | Rad, | Dimethoxycurcumin, a metabolically stable analogue of curcumin enhances the radiosensitivity of cancer cells: Possible involvement of ROS and thioredoxin reductase |
| - | in-vitro, | Lung, | A549 |
| 1981- | CUR, | Mitochondrial targeted curcumin exhibits anticancer effects through disruption of mitochondrial redox and modulation of TrxR2 activity |
| - | in-vitro, | Lung, | NA |
| 1982- | CUR, | Inhibition of thioredoxin reductase by curcumin analogs |
| - | in-vitro, | NA, | NA |
| 1998- | Myr, | CUR, | Thioredoxin-dependent system. Application of inhibitors |
| - | Review, | Var, | NA |
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