Fischer, Karin and Voelkl, Simon and Berger, Jana and Andreesen, Reinhard and Pomorski, Thomas and Mackensen, Andreas (2006) Antigen recognition induces phosphatidylserine exposure on the cell surface of human CD8(+) T cells. BLOOD, 108 (13). pp. 4094-4101. ISSN 0006-4971,
Full text not available from this repository. (Request a copy)Abstract
In eukaryotic cells the phospholipid phosphatidylserine (PS) is restricted to the inner plasma-membrane leaflet. This lipid asymmetry, which is maintained by the concerted action of phospholipid transport proteins, is mainly lost during apoptosis. Here, we demonstrate that primary human CD8(+) cytotoxic T lymphocytes (CTLs) expose PS on T-cell receptor (TCR)-mediated antigen (Ag) recognition. In contrast to PS externalization on apoptotic cells, activation-induced PS exposure is less pronounced and reversible. Fluorescence microscopic analysis revealed that PS is distributed nonhomogenously over the plasma membrane and concentrated in membrane lipid raft domains at the immunologic synapse. By studying the activity of PS transport proteins using a fluorescence-labeled PS analogue, we found that activation of CTLs inhibited the flippase-mediated inward-directed PS transport without affecting the outward transport. Shielding of ex- posed PS by annexin V protein during Ag recognition diminished cytokine secretion, activation, and cell-to-cell clustering of Ag-specific CTLs. In summary, our data demonstrate for the first time that externalized PS on Ag-stimulated CTLs is linked to T-cell activation and probably involved in cell-to-cell contact formation at the immunologic synapse. (Blood. 2006; 108:4094-4101) (c) 2006 by The American Society of Hematology.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FLOW-CYTOMETRIC DETECTION; ANNEXIN-V; LIPID RAFTS; B-CELLS; DENDRITIC CELLS; SCOTT-SYNDROME; DEATH KNELL; FLIP-FLOP; ACTIVATION; EXPRESSION; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Innere Medizin III (Hämatologie und Internistische Onkologie) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jan 2021 12:26 |
| Last Modified: | 15 Jan 2021 12:26 |
| URI: | https://pred.uni-regensburg.de/id/eprint/33650 |
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