Targeting Axon Integrity to Prevent Chemotherapy-Induced Peripheral Neuropathy
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Chemotherapy-induced peripheral neuropathy (CIPN) is an irreversible off-target adverse effect of many chemotherapeutic agents such as paclitaxel, yet its mechanism is poorly understood and no preventative measure is available. CIPN is characterized by peripheral nerve damages resulting in permanent sensory function deficits. Our recent unbiased genome-wide analysis revealed that heat shock protein (Hsp) 27 is part of a transcriptional network induced by axonal injury and highly enriched for genes involved in adaptive neuronal responses, particularly axonal regeneration. To examine if Hsp27 could prevent the occurrence of CIPN, we first demonstrated that paclitaxel-induced allodynia was associated directly with axonal degeneration in sensory neurons in a mouse model of CIPN. We therefore hypothesize that by preventing axonal degeneration could prevent the development of CIPN. We drove expression of human Hsp27 (hHsp27) specifically in neurons. Development of mechanical and thermal allodynia was prevented completely in paclitaxel-treated hHsp27 transgenic mice. Strikingly, hHsp27 protected against paclitaxel-induced neurotoxicity in vivo including degeneration of afferent nerve fibers, demyelination, mitochondrial swelling, apoptosis, and restored sensory nerve action potential. Finally, we delineated signaling cascades that link CIPN development to caspase 3 and RhoA/cofilin activation in sensory neurons and peripheral nerves. hHsp27 exerted anti-apoptotic effect and maintained axon integrity by restoring caspase 3 and RhoA expression to basal levels. Taken together, our data suggest that by preventing axonal degeneration might prove beneficial as anti-CIPN drugs, which represents an emerging research area for therapeutic development.
KeywordsChemotherapy-induced peripheral neuropathy Heat shock protein 27 Paclitaxel Axonal degeneration Apoptosis
This work is supported in part by GRF grants from The Research Grant Council of the Hong Kong Special Administrative Region Government (CityU 11100015 and CityU 11100417), and the Health and Medical Research Fund, Food and Health Bureau, Hong Kong Special Administrative Region Government (05160126) award to Chi Ma.
VC carried out the neurobehavioral assessment, in vivo electrophysiological recording, immunohistochemistry of skin and nerve biopsies, electron microscopy, TUNEL assay, and Western blot analysis for cleaved caspase 3 protein expression. NPBA performed in vitro DRG culture analysis and Western blot analysis for RhoA/cofilin activation. GK validated and standardized SNAP and NCV recording. CHEM conceived the project, designed the study, and wrote the manuscript with inputs from all authors. All authors read and approved the final manuscript.
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Conflict of Interest
The authors declare that they have no conflict of interest.
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