Authors: Jung S et al.
Anesthesiology 144(4):871–885, April 2026
Summary:
This experimental study investigates a key mechanism behind anesthetic-induced neurotoxicity, focusing on how Isoflurane disrupts calcium regulation in neurons. The authors specifically examined whether impaired calcium removal—rather than increased calcium entry—drives neuronal injury.
Using mouse neuronal cultures, the study demonstrated that isoflurane significantly prolongs the time required for neurons to clear intracellular calcium after stimulation. This effect was traced to mitochondrial dysfunction, as isoflurane inhibits mitochondrial complex I, reducing ATP production. Because calcium removal depends on ATP-driven mechanisms—particularly SERCA (sarcoplasmic/endoplasmic reticulum calcium ATPase)—reduced ATP leads to failure of calcium clearance.
Importantly, restoring ATP levels corrected the calcium removal defect even in the presence of isoflurane, strongly supporting a causal link between mitochondrial energy failure and calcium dysregulation. Similarly, activating SERCA improved calcium handling, further confirming the mechanism.
The downstream consequences were clinically relevant at the cellular level: impaired calcium clearance led to mitochondrial dysfunction and activation of caspases, early markers of cell injury and apoptosis. These findings suggest that anesthetic-induced neurotoxicity may be driven more by impaired calcium removal than by excessive calcium influx.
Overall, the study provides a mechanistic framework linking mitochondrial inhibition, ATP depletion, calcium accumulation, and neuronal injury—offering potential targets for mitigating anesthetic-related neurotoxicity.
Key Points:
- Isoflurane impairs neuronal calcium clearance rather than increasing calcium entry
- Mitochondrial inhibition reduces ATP, disrupting SERCA-dependent calcium removal
- Restoring ATP or activating SERCA reverses the calcium handling defect
- Calcium accumulation leads to mitochondrial damage and activation of cell death pathways
- Identifies impaired calcium removal as a key driver of anesthetic-induced neurotoxicity
What You Should Know:
This helps explain the “why” behind anesthetic neurotoxicity. It’s not just calcium going up—it’s the failure to clear it. The root problem is mitochondrial energy failure. If this translates clinically, future strategies may focus on protecting mitochondria or supporting ATP production rather than just limiting exposure.
We would like to thank Anesthesiology for allowing us to summarize and share this article.