Synthetic hydrogel nanoparticles for sepsis therapy.

Area of Science:

• Biomedical Engineering
• Immunology
• Pharmacology

Background:

• Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection.
• Current treatments for sepsis lack direct therapeutic agents, necessitating novel interventions.
• Histones are identified as major inflammatory mediators contributing to sepsis progression and organ damage.

Purpose of the Study:

• To develop and evaluate an abiotic hydrogel nanoparticle (HNP) as a potential therapeutic agent for late-stage sepsis.
• To assess the capacity of HNPs to capture and neutralize histones, a critical inflammatory mediator in sepsis.
• To investigate the efficacy of HNPs in preventing histone-induced pathology and improving survival in preclinical sepsis models.

Main Methods:

• Design and synthesis of highly optimized hydrogel nanoparticles (HNPs) with high capacity and long circulation.
• In vitro assessment of HNP's ability to capture and neutralize various histone variants.
• In vivo administration of HNPs in mouse models, including lethal histone challenge and murine sepsis models.

Main Results:

• HNPs demonstrated selective sequestration and neutralization of histones.
• Intravenous HNP injection protected mice against lethal histone doses by inhibiting platelet aggregation and lung migration.
• Administration of HNPs in a murine sepsis model resulted in near-complete survival rates.

Conclusions:

• Abiotic hydrogel nanoparticles represent a novel therapeutic strategy for sepsis intervention.
• Targeting and neutralizing histones with synthetic sequestrants offers a promising approach for sepsis treatment.
• This study highlights the critical role of histones in sepsis pathogenesis and the potential of polymer hydrogels in managing the condition.