The relationship between biocompatibility and interleukin-1

Area of Science:

• Biomedical Engineering
• Immunology
• Nephrology

Background:

• Biocompatibility is redefined as mutual tolerance with life.
• Extracorporeal and invasive procedures can trigger the body's inflammatory defense mechanisms.
• Interleukin-1 (IL-1) is a key mediator in the inflammatory response.

Purpose of the Study:

• To explore the mechanisms by which extracorporeal procedures stimulate Interleukin-1 (IL-1) production.
• To identify the consequences of chronic IL-1 stimulation.
• To highlight the need for strategies to mitigate these adverse effects.

Main Methods:

• Review of existing literature on biocompatibility and inflammatory responses.
• Identification of IL-1 inducers present in extracorporeal circuits (dialysate, bacterial products, complement activation).
• Correlation of IL-1 stimulation with clinical complications.

Main Results:

• IL-1 production is stimulated by components in dialysate (bacterial pyrogen, acetate) and bacterial cell wall fragments (muramyl peptides).
• Activation of the complement system (C5a) also induces IL-1 production.
• Chronic IL-1 stimulation is linked to muscle wasting, osteopenia, bone cysts, joint fibrosis, and carpal-tunnel syndrome.

Conclusions:

• Extracorporeal procedures initiate a cascade leading to IL-1 production and acute phase response.
• Adverse outcomes such as "Shrinking man syndrome" and amyloidosis are associated with repeated IL-1 stimulation.
• Urgent research and clinical efforts are needed to reduce these complications.