Inflammasome Activation in Cerebral Ischemia-Reperfusion Injury

Cerebral ischemia-reperfusion injury arises when blood flow is restored to brain tissue after a period of oxygen and nutrient deprivation, paradoxically exacerbating neuronal death and inflammation. Central to this process is the assembly of inflammasomes, multiprotein platforms that sense cellular stress and drive maturation of pro-inflammatory cytokines such as interleukin-1β and interleukin-18. Among these complexes, the NLRP3 inflammasome has emerged as a critical regulator of sterile neuroinflammation in stroke. Activation is triggered by mitochondrial dysfunction, reactive oxygen species accumulation and ionic fluxes, leading to caspase-1 activation and a specialised form of programmed cell death termed pyroptosis. Pyroptotic death of neurons, glia and endothelial cells further amplifies blood–brain barrier breakdown and immune cell infiltration, perpetuating a cycle of injury. Understanding the molecular triggers and cell-type specificity of inflammasome activation offers avenues to limit post-ischemic inflammation, promote tissue repair and improve functional recovery.

Research from Nature Portfolio

Selective blockade of NLRP3 with a brain-penetrant inhibitor has been shown to reduce infarct volume, oedema and neurological deficits in a transient middle cerebral artery occlusion model. Treatment dampened caspase-1 cleavage, lowered interleukin-1β release in the penumbral region and preserved tight junction proteins of the blood–brain barrier. These effects were accompanied by reduced activation of the NF-κB pathway and diminished secondary haemorrhagic transformation. This work underlines the therapeutic potential of targeting inflammasome assembly to attenuate sterile inflammation and neuronal loss after reperfusion.

Inflammasome Activation in Cerebral Ischemia-Reperfusion Injury publication trend

The graph below shows the total number of articles in inflammasome activation in cerebral ischemia-reperfusion injury across all publications each year (not limited to Nature Index journals).

Technical terms

Inflammasome: A cytosolic multiprotein complex that detects stress signals and activates inflammatory caspases.

NLRP3: A nucleotide-binding receptor that forms the NLRP3 inflammasome upon sensing cellular damage.

Pyroptosis: A lytic form of programmed cell death driven by inflammasome-activated gasdermin pores and pro-inflammatory cytokine release.

Microglia: Resident immune cells of the brain that orchestrate inflammatory responses to injury.

Reperfusion: Restoration of blood flow after ischaemia, which can paradoxically intensify tissue damage through oxidative and inflammatory mechanisms.

Blood–brain barrier: A specialised endothelial interface that regulates passage of cells and molecules between blood and neural tissue.

References

1. Cortical microinfarcts potentiate recurrent ischemic injury through NLRP3-dependent trained immunity. Cell Death & Disease (2024).
2. Mitochondrial dysfunction induces NLRP3 inflammasome activation during cerebral ischemia/reperfusion injury. Journal of Neuroinflammation (2018).
3. Targeting pyroptosis as a preventive and therapeutic approach for stroke. Cell Death Discovery (2023).
4. Inhibition of the NLRP3-inflammasome as a potential approach for neuroprotection after stroke. Scientific Reports (2018).
5. Intermittent theta-burst stimulation improves motor function by inhibiting neuronal pyroptosis and regulating microglial polarization via TLR4/NFκB/NLRP3 signaling pathway in cerebral ischemic mice. Journal of Neuroinflammation (2022).