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Assessment of batch to batch variation in polyclonal antithymocyte globulin preparations
Irene Popow1, Judith Leitner, Otto Majdic
1Institute of Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria.
Transplantation
|December 22, 2011
Summary
Batch consistency was confirmed for antithymocyte globulins (ATGs) used in transplantation. In vitro analysis showed high conformity, suggesting similar clinical efficacy across different batches of ATG-Fresenius and Thymoglobulin.
Area of Science:
- Immunology
- Transplantation immunology
- Biotechnology
Background:
- Antithymocyte globulins (ATGs) are critical for preventing allograft rejection and graft-versus-host disease.
- Two main types, ATG-Fresenius and Thymoglobulin, are derived from different immunization sources.
- Potential batch-to-batch variability in antibody content and targets could impact clinical efficacy.
Purpose of the Study:
- To compare the batch consistency of ATG-Fresenius and Thymoglobulin.
- To assess the reactivity and functional capacity of different ATG batches.
- To establish reliable methods for analyzing ATG batch quality.
Main Methods:
- Flow cytometry was used to analyze ATG binding to leukocytes from healthy donors and kidney transplant recipients.
- Reactivity of different ATG batches was tested against cell lines expressing ATG antigens.
- Complement-mediated lysis of monocytes and lymphocytes by various ATG batches was compared.
Main Results:
- Binding studies demonstrated high conformity in leukocyte antigen interaction among different batches of both ATG preparations.
- Functional analyses, including complement-mediated lysis, also showed high consistency between batches.
- In vitro assays indicated minimal variability within ATG-Fresenius and Thymoglobulin batches.
Conclusions:
- In vitro data suggest that different batches of ATGs are unlikely to vary in clinical efficacy.
- The described analytical methods provide a reliable means for assessing ATG batch quality.
- Ensuring ATG batch consistency is crucial for predictable therapeutic outcomes in transplantation.
