Specific removal of antibodies with an immunoadsorption system

Area of Science:

• Immunology
• Biomedical Engineering

Background:

• Circulating immunoglobulin G (IgG) antibodies play a role in various autoimmune and inflammatory conditions.
• Current methods for IgG removal, such as plasma exchange, have limitations and potential side effects.

Purpose of the Study:

• To develop and evaluate a continuous flow immunoadsorption system for the specific removal of circulating IgG.
• To assess the safety and efficacy of this novel system in a preclinical model.

Main Methods:

• Development of a continuous flow system integrating a cell separator, protein A-sepharose columns, and semi-automatic elution.
• Treatment of six dogs with the system over 19 sessions, monitoring clinical parameters and laboratory values.
• Assessment of IgG and specific antibody level reduction following ex vivo plasma perfusion.

Main Results:

• The system demonstrated safe application, with no instances of fever, sepsis, or respiratory distress.
• Serial blood counts and liver/renal function tests remained within normal ranges.
• Ex vivo perfusion reduced IgG levels by approximately 50%, leading to a similar decrease in specific antibody titers.

Conclusions:

• The continuous flow immunoadsorption system is a safe and effective method for IgG removal.
• This technology presents a promising alternative to plasma exchange for therapeutic antibody reduction.