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Updated: Sep 30, 2026
Modeling Neuronal Death and Degeneration in Mouse Primary Cerebellar Granule Neurons
Published on: November 6, 2017
Fentanyl-induced cortical and cardiopulmonary damage linked to immune response functions and apoptosis-necrosis
Nabarun Chakraborty1, Mital Patel1,2, Swapna Kannan1,3
1Medical Readiness Systems Biology, Center for Military Psychiatry and Neuroscience (CMPN), Walter Reed Army Institute of Research, Silver Spring, MD, United States.
Introduction:
Fentanyl can rapidly impair brain and cardiopulmonary functions due to its high pharmacokinetics, necessitating a systems-level investigation to elucidate the early host response profile. To address this, we developed an SKH-1 mouse model to integrate ex-vivo imaging with multi-omics data, enabling a comprehensive understanding of tissue-specific host responses across time and dose gradients.
Methods:
Our previous study characterized the phenotypes of this mouse model to establish dose gradients and time points associated with major clinical manifestations. Building on these findings, cortex, heart, and lung tissues were collected postmortem at 40 min, 6h, 24h, and 7 days following administration of one of three fentanyl doses: the highest non-lethal dose (HNLD), LD10, and LD50.
Results:
Multi-omics analysis revealed immune response networks and apoptosis-necrosis functions as primary targets of fentanyl. Cortical and pulmonary immune responses exhibited dose-dependent latencies but remained activated 7 days post-exposure, whereas the cardiac immune response was suppressed over time. Pulmonary apoptosis-necrosis was rapidly activated, contrasting with its delayed, dose-dependent activation in the heart. In the cortex, apoptosis-necrosis followed a monophasic longitudinal trajectory, with delayed activation after 24h followed by regression. These findings suggest tissue-specific time windows for early intervention. Subsequent machine learning analysis identified phylogenetically conserved and miRNAs, such as miR-146-5p and miR-877-3p, which demonstrated consistent time- and dose-independent regulation in the lungs and cortex, respectively.
Conclusion:
Functional associations of these miRNAs with tissue-specific lesions highlight their potential therapeutic value. Further interrogation of miRNA-mRNA interactions and downstream target analysis could pave the way for developing precision countermeasures against fentanyl toxicity.
Insights
Fentanyl exposure triggers distinct immune and cell death responses in the brain, heart, and lungs. Specific microRNAs (miRNAs) show potential for targeted therapies against fentanyl toxicity.
Area of Science:
- Pharmacology
- Toxicology
- Systems Biology
Background:
- Fentanyl's rapid impairment of vital functions necessitates understanding early host responses.
- A systems-level approach is crucial for a comprehensive analysis of tissue-specific effects.
Purpose of the Study:
- To investigate the time- and dose-dependent host response to fentanyl exposure.
- To identify key molecular mechanisms and potential therapeutic targets.
Main Methods:
- Developed an SKH-1 mouse model integrating ex-vivo imaging and multi-omics.
- Collected cortex, heart, and lung tissues at multiple time points post-fentanyl administration.
- Utilized machine learning to identify regulatory microRNAs.
Main Results:
- Fentanyl primarily impacts immune response networks and apoptosis-necrosis pathways.
- Tissue-specific immune responses and cell death patterns were observed, with varying latencies and durations.
- Identified conserved microRNAs (miR-146-5p, miR-877-3p) with potential therapeutic roles.
Conclusions:
- Fentanyl toxicity involves complex, tissue-specific molecular responses.
- Identified microRNAs offer potential for developing precision countermeasures.
- Understanding temporal dynamics is key for effective early intervention strategies.
