Novel apoptosis assay to analyze immunosuppression
Andreas Boldt1, Markus Johannes Barten, Claudia Weiss
1Department of Cardiac Surgery, University of Leipzig-Heart Center, Leipzig, Germany. andreasboldt@web.de
Summary
Mycophenolate acid, rapamycin, and tacrolimus increase lymphocyte apoptosis, with mycophenolate acid showing the strongest effect. Cyclosporin A had no significant impact in this novel whole blood assay.
Area of Science:
- Immunology
- Pharmacology
Background:
- Assessing immunosuppressant effects on lymphocyte apoptosis is crucial for transplant patients.
- A novel whole blood assay was developed for this purpose.
Purpose of the Study:
- To evaluate the impact of common immunosuppressants on lymphocyte apoptosis using a new whole blood assay.
- To compare the efficacy of cyclosporin A, mycophenolate acid, tacrolimus, and rapamycin in inducing apoptosis.
Main Methods:
- Peripheral blood samples were treated with varying concentrations of cyclosporin A, mycophenolate acid, tacrolimus, or rapamycin.
- Whole blood was stimulated with staurosporine (0-5 microM) for 24 hours.
- Apoptosis was quantified using Annexin V expression via flow cytometry (FACS).
Main Results:
- Mycophenolate acid, rapamycin, and tacrolimus significantly increased the percentage of apoptotic cells compared to controls (P < 0.05).
- Mycophenolate acid demonstrated the most pronounced effect on apoptosis (20.9 +/- 3.7%).
- Cyclosporin A did not significantly alter lymphocyte apoptosis levels.
Conclusions:
- The developed whole blood assay effectively differentiates the apoptotic effects of immunosuppressants.
- Mycophenolate acid exhibits a stronger apoptotic effect on lymphocytes than rapamycin and tacrolimus.
- Cyclosporin A does not induce significant lymphocyte apoptosis in this assay setting.
