Fisetin is a plant based flavonoid. Found in strawberries(160ug/g), apples, persimmons, onions, cucumbers, grapes.
-Note half-life 3-4hrs
- Oral BioAv low (40-50%)
Pathways:
- induce
ROS production in cancer cells, but also known to reduce it.
Also a claim
Fisetin-Induced Reactive Oxygen Species Production Has No Effect on Apoptosis in RCC cells
Also one claim (NAC 10-20mM levels) that
NAC enhances ROS/apoptosis
- ROS↑ related:
MMP↓(ΔΨm),
ER Stress↑,
UPR↑,
GRP78↑,
Ca+2↑,
Cyt‑c↑,
Caspases↑,
DNA damage↑,
cl-PARP↑,
HSP↓
- Does not appear to lower antioxidants in cancer cells
- Raises
AntiOxidant
defense in Normal Cells:
ROS↓,
NRF2↑,
SOD↑,
GSH↑,
Catalase↑,
- lowers
Inflammation :
NF-kB↓">NF-kB↓,
COX2↓,
p38↓, Pro-Inflammatory Cytokines :
IL-1β↓,
TNF-α↓,
IL-6↓,
- inhibit Growth/Metastases :
TumMeta↓,
TumCG↓,
EMT↓,
MMPs↓,
MMP2↓,
MMP9↓,
IGF-1↓,
uPA↓,
VEGF↓,
FAK↓,
RhoA↓,
NF-κB↓,
TGF-β↓,
ERK↓
- cause Cell cycle arrest :
TumCCA↑,
cyclin D1↓,
cyclin E↓,
CDK2↓,
CDK4↓,
CDK6↓,
- inhibits Migration/Invasion :
TumCMig↓,
TumCI↓,
FAK↓,
ERK↓,
EMT↓,
TOP1↓,
TET1↓,
- inhibits
HIF-1α↓,
cMyc↓,
LDH↓,
GRP78↑,
- inhibits
angiogenesis↓ :
VEGF↓,
HIF-1α↓,
EGFR↓,
- inhibits Cancer Stem Cells :
CD133↓,
β-catenin↓,
- Others: PI3K↓,
AKT↓,
JAK↓,
STAT↓,
Wnt↓,
β-catenin↓,
AMPK↓,
ERK↓,
JNK,
- Synergies:
chemo-sensitization,
chemoProtective,
RadioSensitizer,
Others(review target notes),
Neuroprotective,
Cognitive,
Renoprotection,
Hepatoprotective,
CardioProtective,
- Selectivity:
Cancer Cells vs Normal Cells
Fisetin effect on Cancer Cells
| Rank |
Pathway / Axis |
Cancer Cells |
Normal Cells |
Label |
Primary Interpretation |
Notes |
| 1 |
PI3K → AKT → mTOR axis |
↓ AKT / ↓ mTOR signaling |
↔ adaptive suppression |
Driver |
Loss of survival and growth signaling |
Fisetin consistently suppresses pro-survival PI3K/AKT signaling, supporting growth inhibition and sensitization to stress |
| 2 |
NF-κB signaling |
↓ NF-κB activation |
↓ inflammatory NF-κB tone |
Driver |
Suppression of inflammatory survival transcription |
NF-κB inhibition contributes to anti-inflammatory effects and reduced tumor-supportive signaling |
| 3 |
Reactive oxygen species (ROS) |
↑ ROS (context- & dose-dependent) |
↓ ROS |
Conditional Driver |
Biphasic redox modulation |
Fisetin can act as a pro-oxidant in cancer cells at higher stress/dose while remaining antioxidant in normal cells |
| 4 |
Mitochondrial integrity / intrinsic apoptosis |
↓ ΔΨm; ↑ caspase activation |
↔ preserved |
Secondary |
Execution of intrinsic apoptosis |
Mitochondrial apoptosis occurs downstream of signaling and redox disruption |
| 5 |
Cell cycle regulation |
↑ G1 or G2/M arrest |
↔ spared |
Phenotypic |
Cytostatic growth control |
Cell-cycle arrest reflects upstream pathway inhibition rather than direct CDK blockade |
| 6 |
Senescence / senolytic action |
↑ senescence clearance (senescent-like tumor/stroma subsets) |
↓ senescent cell burden (selective) |
Secondary |
Selective vulnerability of senescent-like cells |
Fisetin is commonly described as senolytic; in cancer context this may impact tumor microenvironment and therapy-induced senescence |
| 7 |
MAPK stress signaling (JNK / p38) |
↑ JNK / ↑ p38 (context-dependent) |
↔ minimal |
Secondary |
Stress-mediated apoptosis signaling |
MAPK activation often follows ROS increase and supports apoptotic signaling |
| 8 |
NRF2 antioxidant response |
↑ NRF2 (adaptive, context-dependent) |
↑ NRF2 (protective) |
Adaptive |
Stress compensation |
NRF2 activation reflects redox buffering responses rather than primary cytotoxicity |
| 9 |
Migration / invasion (EMT, MMP axis) |
↓ migration & invasion |
↔ |
Phenotypic |
Anti-metastatic phenotype |
Reduced EMT and protease activity limit invasive behavior downstream of signaling changes |
|