Honokiol is a Lignan isolated from bark, seed cones and leaves of trees of Magnolia species. Honokiol was traditionally used for anxiety and stroke treatment, as well as the alleviation of flu symptoms.
-considered to have antioxidant properties
-low oral bioavailability and difficulty in intravenous administration
-the development of various formulations of honokiol, including microemulsion, liposomes, nanoparticles and micelle copolymers have successfully solved the problem of low water solubility.
Pathways:
-Inhibit NF-κB activation
-Downregulate STAT3 signalin
-Inhibiting the PI3K/Akt pathway,
-Inhibition of mTOR
-Influences various MAPK cascades—including ERK, JNK, and p38
-Inhibition of EGFR
-Inhibiting Notch pathway (CSCs)
-GPx4 inhibit
-Can induce ER stress in cancer cells, which contributes to the activation of unfolded protein response (UPR) pathways
-Disrupt the mitochondrial membrane potential in cancer cells.
-Reported to increase ROS production in cancer cells
-Can exhibit antioxidant properties in normal cells.
- has some inhibitor activity but Not classified as HDAC inhibitor as weaker and may work more indirectly.
- is well-known in the research community for its role in activating SIRT3
-Note half-life 40–60 minutes
BioAv
Pathways:
- induce
ROS production in cancer cells,
and typically lowers ROS in normal cells
- ROS↑ related:
MMP↓(ΔΨm),
ER Stress↑,
GRP78↑,
Ca+2↑,
Cyt‑c↑,
Caspases↑,
DNA damage↑,
cl-PARP↑,
HSP↓
Prx
- Raises
AntiOxidant
defense in Normal Cells:
ROS↓,
NRF2↑,
SOD↑,
GSH↑,
Catalase↑,
- lowers
Inflammation :
NF-kB↓,
COX2↓,
Pro-Inflammatory Cytokines :
IL-1β↓,
TNF-α↓,
IL-6↓,
- inhibit Growth/Metastases :
TumMeta↓,
TumCG↓,
EMT↓,
MMPs↓,
MMP2↓,
MMP9↓,
VEGF↓,
ROCK1↓,
RhoA↓,
NF-κB↓,
CXCR4↓,
ERK↓
- reactivate genes thereby inhibiting cancer cell growth :
HDAC↓,
EZH2↓,
P53↑,
HSP↓,
- cause Cell cycle arrest :
TumCCA↑,
cyclin D1↓,
cyclin E↓,
CDK2↓,
CDK4↓,
CDK6↓,
- inhibits Migration/Invasion :
TumCMig↓,
TumCI↓,
ERK↓,
EMT↓,
- inhibits
glycolysis
and
ATP depletion :
HIF-1α↓,
cMyc↓,
GLUT1↓,
LDH↓,
LDHA↓,
HK2↓,
PDKs↓,
ECAR↓,
OXPHOS↓,
GRP78↑,
GlucoseCon↓
- inhibits
angiogenesis↓ :
VEGF↓,
HIF-1α↓,
Notch↓,
EGFR↓,
- inhibits Cancer Stem Cells :
CSC↓,
CD133↓,
β-catenin↓,
sox2↓,
nestin↓,
OCT4↓,
- Others: PI3K↓,
AKT↓,
JAK↓,
STAT↓,
Wnt↓,
β-catenin↓,
AMPK,
ERK↓,
JNK,
TrxR**,
- Shown to modulate the nuclear translocation of
SREBP-2 (related to cholesterol).
- Synergies:
chemo-sensitization,
chemoProtective,
RadioSensitizer,
RadioProtective,
Others(review target notes),
Neuroprotective,
Cognitive,
Renoprotection,
Hepatoprotective,
CardioProtective,
- Selectivity:
Cancer Cells vs Normal Cells
| Rank |
Pathway / Axis |
Cancer Cells |
Normal Cells |
Label |
Primary Interpretation |
Notes |
| 1 |
Mitochondrial integrity / intrinsic apoptosis |
↓ ΔΨm; ↑ cytochrome-c release; ↑ caspases |
↔ largely preserved |
Driver |
Mitochondria-directed cytotoxicity |
Honokiol directly accumulates in mitochondria and initiates intrinsic apoptosis in cancer cells |
| 2 |
Reactive oxygen species (ROS) |
↑ ROS (secondary, stress-amplifying) |
↔ buffered |
Secondary |
Mitochondrial stress amplification |
ROS elevation follows mitochondrial perturbation rather than acting as the initiating trigger |
| 3 |
STAT3 signaling |
↓ STAT3 activation |
↔ minimal |
Driver |
Loss of survival and stemness signaling |
STAT3 suppression contributes to apoptosis, CSC targeting, and reduced proliferation |
| 4 |
PI3K → AKT → mTOR axis |
↓ AKT / ↓ mTOR |
↔ adaptive suppression |
Secondary |
Growth and anabolic inhibition |
AKT/mTOR inhibition reinforces mitochondrial and apoptotic stress |
| 5 |
NF-κB signaling |
↓ NF-κB activation |
↓ inflammatory NF-κB tone |
Secondary |
Suppression of survival transcription |
NF-κB inhibition contributes to chemosensitization and anti-inflammatory effects |
| 6 |
Cell cycle regulation |
↑ G0/G1 or G2/M arrest |
↔ spared |
Phenotypic |
Cytostatic growth control |
Cell-cycle arrest reflects upstream signaling disruption |
| 7 |
Autophagy |
↑ autophagy (context-dependent) |
↑ adaptive autophagy |
Adaptive |
Stress response vs death cooperation |
Autophagy may precede apoptosis or act as a transient survival response |
|