Multivalent sulphur-modified biosilica nanostructures for bacterial enteritis therapy.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Microbiology

Background:

• Bacterial enteritis disrupts gut microbiota and causes inflammation.
• Pathogenic bacteria pose a significant threat to gastrointestinal health.
• Current treatments have limitations in efficacy and side effects.

Purpose of the Study:

• To develop novel polyethyleneimine (PEI)-based mesoporous silica nanostructures for treating bacterial enteritis.
• To simultaneously eradicate pathogenic bacteria, modulate immune response, and reduce intestinal inflammation.
• To create a versatile platform for targeted delivery of antibacterial agents.

Main Methods:

• Synthesized PEI-based mesoporous silica nanostructures co-modified with -SH and -S-S- groups.
• Investigated the mechanism of bacterial eradication via glutathione balance perturbation and ROS scavenging.
• Evaluated the absorption of bacterial components (LPS, flagella, cfDNA) by the nanostructures.
• Assessed the encapsulation and targeted delivery of antibacterial agents (berberine chloride, norfloxacin).

Main Results:

• The nanostructures effectively eradicated pathogenic bacteria by disrupting their redox balance.
• Sulfur modification (-SH, -S-S-) scavenged reactive oxygen species, mitigating inflammation.
• PEI-modified silica efficiently absorbed bacterial toxins and extracellular DNA.
• Encapsulated antibacterial agents were delivered effectively, reducing side effects.

Conclusions:

• PEI-based mesoporous silica nanostructures offer a multifunctional strategy for bacterial enteritis.
• The sulfur modification enhances antibacterial activity and anti-inflammatory effects.
• This platform shows potential for next-generation antimicrobial therapies with targeted drug delivery.