# Elucidating Trigonelline's Therapeutic Mechanisms for Traumatic Brain Injury Through Integrated Network Pharmacology and In Vivo Validation

## TL;DR

Trigonelline reduces brain injury by targeting inflammation and cell death pathways, offering a potential treatment for traumatic brain injury.

## Contribution

This study identifies the molecular mechanisms of trigonelline in mitigating acute TBI through network pharmacology and in vivo validation.

## Key findings

- Trigonelline reduces brain swelling, inflammation, and oxidative stress after TBI.
- It inhibits neuronal apoptosis via suppression of the MAPK signaling pathway.
- Trigonelline downregulates AQP4 and MMP-9, preserving blood-brain barrier integrity.

## Abstract

Traumatic brain injury (TBI) triggers complex pathological cascades, including inflammation, oxidative stress, apoptosis, and gliosis, particularly during the acute phase after injury. Trigonelline has been reported to exert neuroprotective effects in experimental models; however, its molecular mechanisms in acute TBI remain insufficiently defined.

This study aimed to elucidate the molecular targets and mechanisms by which trigonelline attenuates acute TBI using an integrated network pharmacology and experimental validation approach.

A trigonelline–target interaction network was constructed based on network pharmacology, followed by GO/KEGG analyses to predict the biological processes and pathways involved. Molecular docking was conducted to validate the binding affinity of trigonelline with key targets. Animal experiments were carried out to confirm the mechanistic predictions.

Network pharmacology identified GAPDH, IL6, ALB, TNF, and IL1B as major hub genes associated with trigonelline. GO/KEGG analyses suggested that the neuroprotective effects of trigonelline against TBI primarily involved the MAPK and PI3K‐Akt pathways. In vivo assays demonstrated that trigonelline treatment significantly reduced brain water content, inflammation, and oxidative stress levels within 72 h post‐injury, while ameliorating histopathological damage, as confirmed by ELISA, HE, and LFB staining. TUNEL, NeuN, and FJB staining further revealed that trigonelline attenuated TBI‐induced neuronal apoptosis. Western blotting demonstrated that trigonelline suppressed MMP‐9 and AQP4 expression and attenuated the triggering of the MAPK signaling pathway.

By attenuating MAPK signaling and apoptosis, trigonelline mitigates neural damage following TBI. The present findings provide experimental evidence supporting the neuroprotective effects of trigonelline in an acute TBI model.

Trigonelline alleviates traumatic brain injury (TBI) by attenuating oxidative stress and neuroinflammation. It inhibits MAPK signaling–mediated neuronal apoptosis and reduces cerebral edema via downregulation of AQP4 and MMP‐9, thereby maintaining blood–brain barrier integrity. These results suggest that targeting the MAPK pathway underlies the neuroprotective effects of trigonelline in TBI.