Abstract
We studied the effects of the binary Clostridium botulinum C2 toxin on stimulated [3H]serotonin release and protein tyrosine phosphorylation in RBL 2H3 hm1 cells. Actin was specifically ADP-ribosylated by C2 toxin in intact cells resulting in a 2–3 fold increase in antigen- or calcium ionophore (A23187)-induced degranulation. The effects of C2 toxin were time- and concentration-dependent. Toxin treatment, which dramatically changes the morphology of RBL cells, was not sufficient to induce mediator release in the absence of activators of secretion. Antigen- and A23187-stimulated tyrosine phosphorylation of 60–80kDa and 110–120kDa proteins was reduced or blocked after C2 toxin incubation. Treatment of RBL cells with the tyrosine phosphatase inhibitor pervanadate reversed the inhibitory effect of C2 toxin on stimulated protein tyrosine phosphorylation indicating activation of phosphatases by C2 toxin. The data indicate that disassembly of the actin cytoskeleton by C2 toxin facilitates FcɛRI-mediated signal-secretion coupling and suggest a role of the actin cytoskeleton in phosphatase regulation in RBL cells.
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Received: 11 September 1997 / Accepted: 22 December 1997
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Prepens, U., Barth, H., Wilting, J. et al. Influence of Clostridium botulinum C2 toxin on FcɛRI-mediated secretion and tyrosine phosphorylation in RBL cells. Naunyn-Schmiedeberg's Arch Pharmacol 357, 323–330 (1998). https://doi.org/10.1007/PL00005174
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DOI: https://doi.org/10.1007/PL00005174
- Key words Actin ADP-ribosylation
- Clostridium
- botulinum C2 toxin
- FcɛRI-signalling
- RBL cells
- Secretion
- Tyrosine phosphorylation
- Abbreviations A23187
- calcium ionophore A23187
- C2I
- enzyme component of Clostridium botulinum
- C2 toxin
- C2II
- binding component of Clostridium
- botulinum C2 toxin
- Cyt. D
- cytochalasin D
- DNP-BSA
- dinitrophenyl-conjugated bovine serum albumin
- FcɛRI
- high affinity receptor for IgE
- G protein
- GTP-binding protein
- IgE
- immunglobulin E
- PAGE
- polyacrylamide gel electrophoresis
- PP2A
- serin-/threonine-specific
- protein phosphatase type 2A
- RBL-2H3 hm1
- 2H3 hm1 subline of rat basophilic leukemia cells
- SDS
- sodium dodecylsulfate