Nrf2 activators and inhibitors.
| S. NO. | Compound | Source | Type | Mechanism of action | Cancer type | References |
|---|---|---|---|---|---|---|
| Nrf2 activators | Sulforaphane (SFN) [1-isothiocyanato-4-(methylsulfonyl)-butane] | Broccoli, Brussels sprouts | Isothiocyanate | Electrophilic modification of Keap1-Cys-151 | Bladder cancer | [128] |
| Oltipraz (4-methyl-5-[2-pyrazinyl]-1,2-dithiole-3-thione) (OPZ) | Cruciferous vegetables | Organosulfur compound | Electrophilic modification of Keap1-Cys-151 | Various cancers in animal models | [129] | |
| Epigallocatechin gallate (EGCG) | Green tea | Catechin | Oxidizing the cysteine thiols of Keap1 | Prostate cancer, head and neck, and lung cancer cell lines | [130] | |
| Dimethyl fumarate (tecfidera or DMF) | Synthetic drug | Fumaric acid ester | Electrophilic modification of Keap1-Cys-151 | Breast, colon, melanoma, and pancreatic cancer | [131] | |
| Diallyl trisulfide (DATS) | Garlic | Isothiocyanate | Modification of Keap1-Cys-288 | Colorectal, breast, and bladder cancer | [132] | |
| Curcumin (CUR) | Dried rhizome of Curcuma longa | Stilbene | Electrophilic modification of Keap1-Cys-151 | Gastric cancer | [133] | |
| 2-Cyano-3,12-dioxooleana-1,9(11)-dien-28-oic acid (CDDO) | Synthetic derivative of oleanolic acid, a naturally occurring plant compound | Synthetic triterpenoids | Electrophilic modification of Keap1-Cys-151 | Pancreatic cancer (e.g., Panc1, Panc28 cells), colon cancer, ovarian cancer, and diffuse large B-cell lymphoma | [134] | |
| Apigenin (4,5,7-trihydroxyflavone (Api)) | Celery, parsley | Plant flavone | Epigenetic modifications of Nrf2 | Breast, colorectal, prostate, liver, lung, skin, and oral cancers | [135] | |
| Resveratrol (3,5,4’-trihydroxystilbene (RES)) | Grapes, berries | (E)-Stilbene derivate | Electrophilic modification of Keap1-Cys-151 | Breast, prostate, colon, ovarian, thyroid, and melanoma | [136] | |
| Carotenoids | Fruits and vegetables | Natural pigments | Potential for cancer prevention by activating the Nrf2 pathway | Initial stage of cancer | [137] | |
| Nrf2 inhibitors | Brusatol (BRU) | Brucea javanica (an evergreen shrub) | Triterpene lactone compound | Stimulation of Nrf2 poly-ubiquitination | Colorectal, pancreatic, lung, liver, leukemia, and glioblastoma | [138] |
| Luteolin (3’,4’,5,7-tetrahydroxyflavone (LUT)) | Celery, parsley, green pepper | Plant flavone | Nrf2 mRNA degradation, reduction of Nrf2 binding to AREs | Lung, breast, prostate, liver, colon, and pancreatic cancers | [139] | |
| Trigonelline (TRG) | Coffee beans and many plants | Coffee-derived alkaloid | Prevention of nuclear translocation of Nrf2 | Pancreatic cancer cell lines | [140] | |
| Ascorbic acid (vitamin C, L-ascorbic acid, AscA, AA) | Citrus fruits | Natural vitamin | Electrophilic modification of Keap1-Cys-151 | Chronic myelogenous leukemia KCL22/SR cells | [141] | |
| Retinoic acid (RA) | Carrots, sweet potatoes, mangoes, papayas, and apricots | Metabolite of vitamin A | Prevention of nuclear translocation of Nrf2 | Breast, prostate, and lung cancer | [142] | |
| Chrysin (5,7-dihydroxy-2-phenyl-4H-chromen-4-one (CHR)) | Honey and propolis | Plant flavone | Prevention of nuclear translocation of Nrf2 | Lung, breast, liver, colon, leukemia, prostate, and melanoma | [143] | |
| Quercetin | Apples, various fruits, and vegetables | Flavonoid | High concentrations can inhibit Nrf2 to increase oxidative stress and promoting cancer cell death | Malignant tumor formation | [144] | |
| Wogonin (5,7-dihydroxy-8-methoxyflavone) | Root of Scutellaria baicalensis | Flavonoids | Nrf2 inhibitor wogonin holds good potential as an efficient natural sensitizer for anti-neoplastic resistance in human myelogenous leukemia | Myelogenous leukemia | [145] | |
| Halofuginone | Root of Dichroa febrifuga Lour. (Blue Evergreen Hydrangea) | Naturally occurring alkaloid | Enhanced the chemosensitivity of cancer cells via suppressing Nrf2 activation | Cancer, fibrosis | [146] | |
| Berberine | Coptidis Rhizoma | Isoquinoline alkaloid | BBR could reverse the lapatinib resistance in HER2-positive breast cancer cells by upregulating the level of ROS through inhibiting the Nrf2 pathway | Breast cancer cells | [147] | |
| Brucein D | Seeds of Brucea javanica | Quassinoid compound | Inhibiting Nrf2 expression via promoting the ubiquitin-proteasome-dependent degradation and downregulating its downstream genes such as HO-1, NQO1, AKR1B10 and γGCSm | Pancreatic ductal adenocarcinoma | [148] | |
| Cryptotanshinone | Root of Salvia miltiorrhiza | Diterpene quinone | Induce cell death and apoptosis in human lung carcinoma A549 (A549/DDP) cells and enhance the sensitivity to cisplatin by down-regulating the Nrf2 pathway | Human lung carcinoma A549 | [149] | |
| Ginsenoside Rd | Active constituents of ginsenosides, is a potent antitumor agent | Active ingredients of ginseng | Depletion of the expression of Nrf2 and its target genes, resulting in an enhanced sensitivity of A549 cells to cisplatin and amelioration of chemoresistance | NSCLC | [150] | |
| Triptolide | Tripterygium wilfordii | Diterpenoid | Reduced Nrf2 expression and transcriptional activity in NSCLC and liver cancer cells | Malignant tumors | [151] |
AA: arachidonic acid; HO-1: haem oxygenase 1; Keap1: Kelch-like ECH-associated protein 1; NQO1: NAD(P)H-quinone oxidoreductase 1; Nrf2: nuclear factor erythroid 2-related factor 2; NSCLC: non-small-cell lung cancer; ROS: reactive oxygen species; AREs: antioxidant response elements.
Dr. Shrikant Kukreti acknowledges the Institute of Eminence, University of Delhi [IoE/2024-25/12/FRP].
AS: Investigation, Writing—original draft, Writing—review & editing. RK: Writing—review & editing. LS: Writing—review & editing. SK: Conceptualization, Investigation, Supervision, Writing—review & editing. All authors read and approved the submitted version.
The authors declare that they have no conflicts of interest.
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