Abstract
Galectin-1 (gal-1) triggers T cell death by several distinct intracellular pathways including the activation of the death-receptor pathway. The aim of this study was to investigate whether gal-1 induced activation of the death-receptor pathway in Jurkat T lymphocytes mediates apoptosis via the mitochondrial pathway linked by truncated Bid (tBid). We demonstrate that gal-1 induced proteolytic cleavage of the death agonist Bid, a member of the Bcl-2/Bcl-xL family and a substrate of activated caspase-8, was inhibited by caspase-8 inhibitor II (Z-IETD-FMK). Downstream of Bid, gal-1 stimulated mitochondrial cytochrome c release as well as the activation and proteolytic processing of initiator procaspase-9 were effectively decreased by caspase-8 inhibitor II. Blocking of gal-1 induced cleavage of effector procaspase-3 by caspase-8 inhibitor II as well as by caspase-9 inhibitors I (Z-LEHD-FMK) and III (Ac-LEHD-CMK) indicates that receptor and mitochondrial pathways converged in procaspase-3 activation and contribute to proteolytic processing of effector procaspase-6 and -7. Western blot analyses and immunofluorescence staining revealed that exposure of Jurkat T cells to gal-1 resulted in the cleavage of the DNA-repair enzyme poly (ADP-ribose) polymerase, cytoskeletal α-fodrin, and nuclear lamin A as substrates of activated caspases. Our data demonstrate that Bid provides a connection between the death receptor and the mitochondrial pathway of gal-1 induced apoptosis in human Jurkat T lymphocytes.
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Abbreviations
- Bp:
-
Base pair
- BSA:
-
Bovine serum albumin
- CD:
-
Cluster of differentiation
- CHAPS:
-
3-[(3-Cholamidopropyl)dimethylammonio]-1-propanesulfonate
- CRD:
-
Carbohydrate recognition domain
- DTT:
-
Dithiothreitol
- ECL:
-
Enhanced chemiluminescence
- EDTA:
-
Ethylene-diaminetetraacetic acid
- EGTA:
-
Ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid
- FCS:
-
Fetal calf serum
- Gal-1:
-
Galectin-1
- HEPES:
-
N-2-hydroxyethyl-piperazine-N-2-ethanesulfonic acid
- IgG:
-
Immunoglobulin G
- HRP:
-
Horseradish peroxidase
- kDa:
-
kilodalton
- mAb:
-
Monoclonal antibody
- NP-40:
-
Nonidet P-40
- pAb:
-
Polyclonal antibody
- PIPES:
-
Piperazine-N,N′-bis(2-ethanesulfonic) acid
- PAGE:
-
Polyacrylamide gel electrophoresis
- PARP:
-
Poly (ADP-ribose) polymerase
- PBS:
-
Phosphate-buffered saline
- PI:
-
Propidium iodide
- SDS:
-
Sodium dodecyl sulphate
- TBS:
-
Tris-buffered saline
- TCR:
-
T cell receptor
- Tris:
-
Tris(hydroxymethyl) aminomethane
- T:
-
Tween 20
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Acknowledgments
This work was supported by a grant from the Deutsche Forschungsgemeinschaft (DFG, WA 1771/1-1). We gratefully acknowledge the excellent technical assistance of Mrs. G. Gaede.
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Lange, F., Brandt, B., Tiedge, M. et al. Galectin-1 induced activation of the mitochondrial apoptotic pathway: evidence for a connection between death-receptor and mitochondrial pathways in human Jurkat T lymphocytes. Histochem Cell Biol 132, 211–223 (2009). https://doi.org/10.1007/s00418-009-0597-x
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DOI: https://doi.org/10.1007/s00418-009-0597-x