Autophagy Mechanisms in Cerebral Ischemia

Autophagy is an evolutionarily conserved process by which cells degrade and recycle cytoplasmic components. In the context of cerebral ischemia—where blood supply to the brain is interrupted—autophagic pathways are rapidly activated in neurons, glia and endothelial cells. Early induction of autophagy can remove damaged organelles and proteins, promoting cell survival and metabolic homeostasis during energy deprivation. However, excessive or dysregulated autophagy contributes to neuronal cell death, exacerbates inflammation and underlies blood–brain barrier breakdown. Key regulators include the energy sensor AMPK, which activates autophagy under low ATP levels, and the mammalian target of rapamycin (mTOR), a central inhibitor of autophagic initiation. Upstream signals converge on the Beclin-1 complex to nucleate autophagosomes and on LC3 lipidation and p62 degradation to control autophagic flux. Cross-talk with apoptotic cascades, oxidative-stress pathways and lysosomal function further modulates outcomes. In recent years, research has illuminated how cell-type-specific autophagy in microglia, astrocytes and endothelial cells shapes infarct size, neuroinflammation and recovery. Understanding the dual roles of autophagy has spurred efforts to tailor interventions: moderate activation to promote repair, or targeted inhibition to prevent excessive self-digestion. Such strategies hold promise for novel therapeutics in ischaemic stroke, a leading cause of death and disability worldwide.

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Autophagy Mechanisms in Cerebral Ischemia publication trend

The graph below shows the total number of articles in autophagy mechanisms in cerebral ischemia across all publications each year (not limited to Nature Index journals).

Technical terms

Autophagosome: A double-membrane vesicle that sequesters cytoplasmic material for lysosomal degradation.

Beclin-1: A core protein that nucleates the autophagic membrane and regulates autophagy initiation.

LC3: Microtubule-associated protein 1 light chain 3; upon lipidation (LC3-II) marks autophagosome formation.

p62 (SQSTM1): An autophagy adaptor protein that binds ubiquitinated cargo and is degraded during autophagy.

mTOR (mammalian target of rapamycin): A serine/threonine kinase that inhibits autophagy when nutrients are abundant.

AMPK (AMP-activated protein kinase): An energy sensor kinase that activates autophagy under low cellular ATP levels.

References

1. Microglia Autophagy Mediated by TMEM166 Promotes Ischemic Stroke Secondary to Carotid Artery Stenosis. Aging and Disease (2024).
2. The Activation of GABAAR Alleviated Cerebral Ischemic Injury via the Suppression of Oxidative Stress, Autophagy, and Apoptosis Pathways. Antioxidants (2024).
3. A study on the mechanism of Beclin-1 m6A modification mediated by catalpol in protection against neuronal injury and autophagy following cerebral ischemia. Molecular Medicine (2024).