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Updated: Jun 16, 2026
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Isolating, Sequencing and Analyzing Extracellular MicroRNAs from Human Mesenchymal Stem Cells
Published on: March 8, 2019
Dissecting bone marrow and plasma exosomal microRNA profiles following trauma.
Agneta Peethala1, Athina L Yoham1, Letitia E Bible2
1Department of Surgery and Sepsis and Critical Illness Research Center, University of Florida College of Medicine, Gainesville, FL.
Surgery
|June 13, 2026
Summary
Chronic stress after polytrauma causes distinct microRNA changes in bone marrow and plasma exosomes. Plasma exosomes reflect systemic stress, while bone marrow exosomes show localized adaptation, challenging direct mirroring assumptions.
Area of Science:
- Biomedical Sciences
- Molecular Biology
- Trauma Research
Background:
- Bone marrow dysfunction contributes to persistent hematologic and immune issues post-trauma.
- Plasma exosomes are a potential tool for studying systemic stress, but their relation to bone marrow regulatory programs is unclear.
- Hypothesis: Chronic stress post-polytrauma generates specific exosomal microRNA signatures in different compartments.
Purpose of the Study:
- To investigate whether chronic stress following polytrauma induces compartment-specific exosomal microRNA signatures.
- To compare microRNA profiles in bone marrow-derived exosomes versus plasma-derived exosomes under chronic stress conditions.
Main Methods:
- Male rats underwent polytrauma or polytrauma plus daily restraint stress for 7 days.
- Bone marrow and plasma exosomes were isolated on day 7.
- Small RNA sequencing was performed to profile microRNA expression; differential expression analysis was conducted.
Main Results:
- Chronic stress led to distinct microRNA responses in bone marrow and plasma exosomes.
- Polytrauma plus stress altered 9 microRNAs in bone marrow exosomes versus 20 in plasma exosomes.
- Minimal overlap between compartments indicated divergent regulatory programs; plasma exosomes reflected systemic inflammation and metabolic stress, while bone marrow exosomes showed localized hematopoietic modulation.
Conclusions:
- Chronic stress post-polytrauma results in compartment-specific exosomal microRNA remodeling.
- Plasma exosomes capture systemic stress signatures, whereas bone marrow exosomes reflect localized regulatory adaptation.
- Tissue origin is crucial for interpreting exosomal microRNA biomarkers in trauma-induced chronic critical illness.
