Related Experiment Video
Updated: Aug 2, 2026
The Analysis of Neurovascular Remodeling in Entorhino-hippocampal Organotypic Slice Cultures
Published on: October 23, 2014
Circulating Exosomes Mediate Neurodegeneration Following Hepatic Ischemia-reperfusion Through Inducing Microglial
Yidan Wang1, Lili Jia2, Min Wei1
1The First Central Clinical School, Tianjin Medical University, Tianjin, China.
Insights
Circulating exosomes link hepatic ischemia reperfusion (HIR) to brain injury in young rats. These exosomes activate microglial pyroptosis, causing hippocampal neuron damage, highlighting a key mechanism in pediatric liver transplant recipients.
Area of Science:
- Neuroscience
- Cell Biology
- Transplantation Research
Background:
- Pediatric liver transplantation can lead to poor neurodevelopmental outcomes.
- Hepatic ischemia reperfusion (HIR) is implicated, but its link to brain injury is unclear.
- Circulating exosomes may mediate information transmission between organs, potentially linking HIR to brain injury.
Purpose of the Study:
- To investigate the role of circulating exosomes in hepatic ischemia reperfusion (HIR)-induced hippocampal injury in young rats.
- To determine if exosomes from HIR model rats cause neuronal injury and microglial pyroptosis in normal rats.
Main Methods:
- Exosomes were isolated from the sera of HIR model rats and administered to normal young rats.
- Techniques included Western blotting, ELISA, histology, and qPCR to assess neuronal injury and microglial pyroptosis.
- In vitro studies involved co-culturing primary microglia with exosomes, with pharmacological inhibition of exosome biogenesis or NLRP3 inflammasome.
Main Results:
- Serum-derived exosomes from HIR rats were found to be crucial mediators of neuronal degeneration in the developing hippocampus.
- Ischemia-reperfusion derived exosomes (I/R-exosomes) were taken up by microglia, promoting microglial pyroptosis both in vivo and in vitro.
- Suppression of microglial pyroptosis alleviated exosome-induced neuronal injury.
Conclusions:
- Circulating exosomes play a vital role in mediating hippocampal neuron injury following HIR in young rats.
- Microglial pyroptosis, triggered by circulating exosomes, is a key mechanism underlying this injury.
- Targeting exosome-mediated microglial pyroptosis may offer therapeutic strategies for neuroprotection after pediatric liver transplantation.
Background:
Poor neurodevelopmental outcomes after pediatric liver transplantation seriously affect the long-term quality of life of recipients, in whom hepatic ischemia reperfusion (HIR) is considered to play a pivotal role. However, the link between HIR and brain injury remains unclear. Because circulating exosomes are considered as the key mediators of information transmission over long distances, we aimed to assess the role of circulating exosomes in HIR-induced hippocampal injury in young rats.
Methods:
We administered exosomes extracted from the sera of HIR model rats to normal young rats via the tail vein. Western blotting, enzyme-linked immunosorbent assay, histological examination, and real-time quantitative polymerase chain reaction were used to evaluate the role of exosomes in neuronal injury and activation of microglial pyroptosis in the developing hippocampus. Primary microglial cells were cocultured with exosomes to further assess the effect of exosomes on microglia. To further explore the potential mechanism, GW4869 or MCC950 was used to block exosome biogenesis or nod-like receptor family protein 3, respectively.
Results:
Serum-derived exosomes played a crucial role in linking HIR with neuronal degeneration in the developing hippocampus. Microglia were found to be the target cells of ischemia-reperfusion derived exosomes (I/R-exosomes). I/R-exosomes were taken up by microglia and promoted the occurrence of microglial pyroptosis in vivo and in vitro. Moreover, the exosome-induced neuronal injury was alleviated by suppressing the occurrence of pyroptosis in the developing hippocampus.
Conclusions:
Microglial pyroptosis induced by circulating exosomes plays a vital role in developing hippocampal neuron injury during HIR in young rats.
Related Concept Videos
01:15Ischemic Stroke ll: Pathophysiology
01:29Hepatic Encephalopathy