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Progesterone-Modulated Phosphatidylserine Externalization in Apoptosis and Activation of Jurkat Cells

Authors

  • Milena Mourdjeva,

    1. Department of Molecular Immunology, Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, Sofia, Bulgaria;
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  • Zlatka Popova,

    1. Department of Molecular Immunology, Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, Sofia, Bulgaria;
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  • Dobroslav Kyurkchiev,

    1. Laboratory of Clinical Immunology, University hospital ‘‘Ivan Rilski’’, Medical University, Sofia, Bulgaria
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  • Katerina Kontinopoulou,

    1. Department of Molecular Immunology, Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, Sofia, Bulgaria;
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  • Iskra Altankova,

    1. Laboratory of Clinical Immunology, University hospital ‘‘Ivan Rilski’’, Medical University, Sofia, Bulgaria
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  • Ivan Kehayov,

    1. Department of Molecular Immunology, Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, Sofia, Bulgaria;
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  • Stanimir Kyurkchiev

    1. Department of Molecular Immunology, Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, Sofia, Bulgaria;
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Milena Mourdjeva, Department of Molecular Immunology, IBIR-BAS, 73 Tzarigradsko shosse, 1113 Sofia, Bulgaria.
E-mail: milena_mourdjeva@hotmail.com

Abstract

Problem  During pregnancy the elevated levels of progesterone (Pg) have immunomodulating effects. It is important to follow-up Pg effects on basic biological processes at cell level as apoptosis and activation which was the aim of this study.

Methods of study  Jurkat cells cultured in the presence or absence of Pg were used as a model system. Apoptosis was induced by H2O2 and activation by phorbol myriastate acetate. The induced changes in the phosphatidylserine (PS) externalization and cell surface CD69 expression were followed by fluorescence-activated cell sorter and immunofluorescence.

Results  After the induction of apoptosis PS externalizes in 52.3% of Jurkat cells. Cells cultured with Pg show tendency to a decrease of PS positive cells (42%). The opposite effect is observed in activated cells – PS externalization increase from 33.8% of control cells to 40.1% of Pg-treated cells.

Conclusions  These findings would suggest that by increasing activation and decreasing apoptosis Pg could regulate local immune system during pregnancy.

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