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Updated: Oct 25, 2025
Nerve Excitability Assessment in Chemotherapy-induced Neurotoxicity
Published on: April 26, 2012
Neuropathological Effects of Chemotherapeutic Drugs
Alan Umfress1, Haley E Speed, Chunfeng Tan
1Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama 35233, United States.
Abstract:
Novel treatments, screening, and detection methods have prolonged the lives of numerous cancer patients worldwide. Unfortunately, existing and many promising new chemotherapeutics can cause deleterious, off-target side effects in normal tissue and organ systems. The central and peripheral nervous systems are widely recognized as frequent off-target effectors of anticancer drugs which can produce persistent neurological and neuropsychiatric symptoms collectively termed "chemobrain". Following chemotherapy, patients report several forms of cognitive impairment occurring acutely and sometimes persisting years after treatment. There are no effective treatments for cognitive decline induced by chemotherapeutics, and the underlying molecular mechanisms are poorly characterized and understood. In this study, we find that chronic treatment with two common chemotherapeutic agents, cisplatin and gemcitabine, impairs brain region-specific metabolism, hippocampus-dependent memory formation, and stress response behavior. This corresponds to reduced hippocampal synaptic excitability, altered neuronal signal transduction, and neuroinflammation. These findings underline that a better understanding of the basic pathological consequences of chemotherapy-induced cognitive impairment is the first step toward improving cancer treatment survivorship.
Insights
Chemotherapy drugs like cisplatin and gemcitabine can cause cognitive impairment, known as chemobrain, by affecting brain metabolism and memory. Understanding these neurological side effects is crucial for improving cancer patient survivorship.
Area of Science:
- Neuroscience
- Oncology
- Pharmacology
Background:
- Cancer treatments, including chemotherapy, significantly improve patient survival rates.
- Chemotherapy can cause off-target side effects, particularly affecting the central and peripheral nervous systems, leading to cognitive deficits termed 'chemobrain'.
- Current treatments for chemotherapy-induced cognitive impairment are lacking, and its underlying molecular mechanisms remain poorly understood.
Purpose of the Study:
- To investigate the effects of chronic chemotherapy on cognitive function and brain activity.
- To elucidate the molecular and cellular mechanisms underlying chemotherapy-induced cognitive impairment.
Main Methods:
- Mice were chronically treated with cisplatin and gemcitabine.
- Behavioral tests assessed hippocampus-dependent memory and stress response.
- Brain region-specific metabolism, synaptic excitability, neuronal signaling, and neuroinflammation were analyzed.
Main Results:
- Chronic cisplatin and gemcitabine treatment impaired hippocampus-dependent memory formation and stress response behavior.
- These impairments were associated with reduced brain region-specific metabolism and hippocampal synaptic excitability.
- Chemotherapy altered neuronal signal transduction pathways and induced neuroinflammation.
Conclusions:
- Chemotherapy significantly impacts brain function, leading to cognitive deficits.
- Understanding the neurobiological consequences of chemotherapy is essential for developing effective interventions.
- Further research into the pathological mechanisms of chemobrain is vital for enhancing cancer survivorship and quality of life.
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