HSF1 Alleviates Brain Injury by Inhibiting NLRP3-Induced Pyroptosis in a Sepsis Model

Area of Science:

• Neuroscience
• Immunology
• Molecular Biology

Background:

• Sepsis is a life-threatening condition with high mortality, often complicated by sepsis-induced brain injury.
• Current clinical strategies for preventing and treating sepsis-induced brain injury are limited, posing a significant health burden.
• Investigating novel molecular targets is crucial for managing sepsis and its neurological complications.

Purpose of the Study:

• To explore the relationship between Heat shock factor 1 (HSF1) and NLRP3 inflammasome in sepsis-induced brain injury.
• To elucidate the mechanism by which HSF1 influences brain injury during sepsis.
• To determine if HSF1 can be a therapeutic target for sepsis-induced brain injury.

Main Methods:

• Utilized wild-type and HSF1 knockout mice for in vivo studies and PC12 cells for in vitro experiments.
• Employed real-time PCR and Western blot to assess the expression of HSF1, NLRP3, cytokines, and pyroptosis-related proteins.
• Used EthD-III staining to detect pyroptosis in hippocampal and PC12 cells.

Main Results:

• HSF1 demonstrated a negative correlation with pyroptosis; HSF1 deficiency exacerbated pyroptosis in brain tissue.
• In vitro, HSF1 knockdown increased pyroptosis, while HSF1 overexpression inhibited it.
• HSF1 negatively regulated the NLRP3 pathway, and its effects on pyroptosis were dependent on NLRP3.

Conclusions:

• HSF1 mitigates sepsis-induced brain injury by suppressing pyroptosis through the NLRP3-dependent pathway.
• These findings highlight HSF1 as a promising molecular target for therapeutic interventions against sepsis-induced brain injury.
• Further clinical studies are warranted to explore HSF1's potential in treating sepsis-related neurological complications.