# The SAP130/Mincle axis was involved in sevoflurane-induced neuronal death and microglial activation in juvenile mice

## TL;DR

This study shows that the SAP130/Mincle pathway contributes to sevoflurane-induced brain damage in young mice, offering a new target for reducing neurotoxic effects.

## Contribution

The study identifies the SAP130/Mincle axis as a novel mechanism in sevoflurane-induced neurotoxicity in juvenile mice.

## Key findings

- Sevoflurane exposure increased neuronal death and microglial activation in co-cultures, with SAP130 upregulation.
- Blocking SAP130 or Syk reduced microglial activation and neuronal death in the co-culture system.
- The SAP130/Mincle axis appears essential for sevoflurane-induced neuroinflammation and neurotoxicity.

## Abstract

Sevoflurane is widely used in pediatric anesthesia and has raised concerns for years regarding its neurotoxic effects on the developing brain. Studies have shown that sevoflurane can lead to neuronal cell death and neuroinflammation, which further contribute to sevoflurane-induced neurotoxicity manifested as delirium or cognitive deficits. However, the molecular mechanism remains poorly understood. A factor of interest is Sin3A-associated protein 130 (SAP130), which can be released by dead or damaged cells and trigger sterile inflammation, exacerbating tissue damage by activating the macrophage-inducible C-type lectin (Mincle) receptor. However, whether the SAP130/Mincle axis is involved in sevoflurane-induced neurotoxicity remains unknown.

Using a young murine sevoflurane exposure model and a primary neuron–microglia co-culture system, we examined changes in neuronal cell death, microglial activation, cytokine production, and the expression levels of SAP130- and Mincle-signaling-associated proteins after sevoflurane exposure. We then applied SAP130-neutralizing antibody and the Syk inhibitor piceatannol to assess the impact of inhibiting the Mincle pathway on microglial activation and sevoflurane-induced neurotoxicity.

The results demonstrated that sevoflurane exposure increased the number of dead neurons with SAP130 upregulation and induced microglial activation with cytokine production in the hippocampus. These changes occurred only in the neuron–microglia co‐culture system but not in neuron or microglia monoculture. Neutralizing SAP130 or pharmacologically inhibiting syk diminished microglial activation and neuronal cell death by suppressing the SAP130/Mincle signaling pathway.

These findings suggest that the SAP130/Mincle axis plays a crucial role in neuronal death and microglial activation in sevoflurane-induced neurotoxicity. Targeting this axis emerges as a potential therapeutic strategy to mitigate the neurotoxic effects of sevoflurane.