Por favor, use este identificador para citar o enlazar este Item:http://hdl.handle.net/20.500.12105/17539
Título
Inhibition of calcium release-activated calcium current by Rac/Cdc42-inactivating clostridial cytotoxins in RBL cells.
Autor(es)
Fecha de publicación
2000-06-23
Cita
J Biol Chem . 2000;275(25):18732-8
Idioma
Inglés
Tipo de documento
journal article
Resumen
Using large clostridial cytotoxins as tools, the role of Rho GTPases in activation of RBL 2H3 hm1 cells was studied. Clostridium difficile toxin B, which glucosylates Rho, Rac, and Cdc42 and Clostridium sordellii lethal toxin, which glucosylates Rac and Cdc42 but not Rho, inhibited the release of hexosaminidase from RBL cells mediated by the high affinity antigen receptor (FcepsilonRI). Additionally, toxin B and lethal toxin inhibited the intracellular Ca(2+) mobilization induced by FcepsilonRI-stimulation and thapsigargin, mainly by reducing the influx of extracellular Ca(2+). In patch clamp recordings, toxin B and lethal toxin inhibited the calcium release-activated calcium current by about 45%. Calcium release-activated calcium current, the receptor-stimulated Ca(2+) influx, and secretion were inhibited neither by the Rho-ADP-ribosylating C3-fusion toxin C2IN-C3 nor by the actin-ADP-ribosylating Clostridium botulinum C2 toxin. The data indicate that Rac and Cdc42 but not Rho are not only involved in late exocytosis events but are also involved in Ca(2+) mobilization most likely by regulating the Ca(2+) influx through calcium release-activated calcium channels activated via FcepsilonRI receptor in RBL cells.
MESH
Animals | Botulinum Toxins | Calcium | Calcium Channel Blockers | Calcium Channels | Protein Serine-Threonine Kinases | Rats | Tumor Cells, Cultured | p21-Activated Kinases
Descripción
Acknowledgment—We thank Dr. V. Flockerzi for helpful criticalreading of the manuscript.
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