Analysis of IL-6 and IL-1β Gene coding and study on specific clearance using histidine-grafted PVDF membranes

Area of Science:

• Biomaterials Science
• Medical Technology
• Immunology

Background:

• Severe infections trigger cytokine storms via inflammatory cytokines like IL-6 and IL-1β.
• Existing blood purification methods struggle to simultaneously remove these distinct cytokines.
• Cytokine storms are a major cause of refractory critical illness.

Purpose of the Study:

• To develop a novel blood purification material capable of simultaneously removing IL-6 and IL-1β.
• To investigate the efficacy and biocompatibility of a histidine-grafted polyvinylidene fluoride (PVDF) membrane.

Main Methods:

• Chemical grafting of histidine onto a PVDF membrane.
• Attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) for material characterization.
• In vitro adsorption studies using IL-6 in aqueous solution and both IL-6 and IL-1β in plasma.
• Biocompatibility assessments including hemolysis, cell adsorption, and coagulation cascade activation.

Main Results:

• Successful chemical grafting of histidine onto the PVDF membrane was confirmed.
• Adsorption capacity for IL-6 increased with histidine concentration.
• The optimized membrane achieved 36% IL-6 and 63% IL-1β adsorption from plasma.
• Demonstrated low hemolysis, minimal red blood cell and platelet adsorption, and anticoagulant properties.

Conclusions:

• The histidine-grafted PVDF membrane is a promising material for simultaneous IL-6 and IL-1β removal.
• This novel material exhibits excellent biocompatibility and anticoagulant properties.
• It presents a potential new therapeutic strategy for managing cytokine storms in severe infections.