Chemotherapy-induced peripheral neuropathy (CIPN) is a dose-limiting complication of many chemotherapeutic agents. Peripheral sensory neurons are particularly vulnerable due to their unique physiology, long axons, and limited regenerative capacity.
Taxanes (paclitaxel, docetaxel) and vinca alkaloids (vincristine) directly target microtubules:
- Stabilize microtubules (taxanes) preventing disassembly
- Prevent microtubule polymerization (vinca alkaloids)
- Disrupt axonal transport
- Impair neurotrophin delivery to nerve terminals
Platinum compounds (cisplatin, carboplatin, oxaliplatin) cause:
- DNA cross-linking and adduct formation
- Inhibition of transcription in dorsal root ganglion neurons
- Activation of p53-dependent apoptosis
- Mitochondrial DNA damage
- Voltage-gated sodium channels: Dysregulated expression leads to hyperexcitability
- TRP channels: TRPV1, TRPA1 activation by chemotherapy agents
- Calcium channels: Altered calcium homeostasis
- Nociceptor sensitization and spontaneous firing
Chemotherapy induces:
- Increased mitochondrial ROS production
- Decreased glutathione levels
- Lipid peroxidation in neuronal membranes
- Activation of oxidative stress pathways (Nrf2)
- IL1B: Pro-inflammatory cytokine elevated in CIPN
- TNF: TNF-alpha-mediated nerve damage
- CCL2: Monocyte chemoattractant recruitment
- Satellite glial cell activation
- Impaired ATP production
- Loss of mitochondrial membrane potential
- Release of pro-apoptotic factors (cytochrome c)
- Caspase-3 activation and apoptosis
¶ Key Genes and Proteins
| Gene/Protein |
Role in CIPN |
Chemotherapy Class |
| MAPT |
Tau phosphorylation |
Taxanes |
| TUBB |
Microtubule integrity |
Vinca alkaloids |
| TP53 |
Apoptosis |
Platinum |
| NGF |
Neurotrophin support |
All |
| BDNF |
Neuronal survival |
All |
| GFAP |
Satellite glial activation |
All |
- Duloxetine: First FDA-approved drug for CIPN
- Gabapentin/pregabalin: Calcium channel modulators
- Vitamin B complex: Nerve nutrition
- Glutathione: Antioxidant
- Cryotherapy: Cooling during infusion
- Neurotrophic factors: NGF, BDNF, GDNF
- Antioxidants: Alpha-lipoic acid, acetyl-L-carnitine
- Mitochondrial protectors: Coenzyme Q10
- Anti-inflammatory agents: Minocycline
- Opioids: For severe pain (tramadol, oxycodone)
- Topical agents: Lidocaine, capsaicin
- Neuromodulation: Spinal cord stimulation
- Physical therapy: Gait training, desensitization