title: D4-GDI is cleaved by caspase-3 during daunorubicin-induced apoptosis in HL-60 cells.
abstract: Daunorubicin, an anti-cancer drug, is known to induce apoptosis in HL-60 cells in a dose-dependent manner through the activation of caspase-3 (CPP32). Caspase-3 selective inhibitor, Ac-DEVD-CHO, prevented both the activation of caspase-3 and cleavage of poly(ADP-ribose) polymerase (PARP). D4-GDI is a GDP dissociation inhibitor for the Ras-related Rho family GTPase in hematopoietic cells. Here we report that D4-GDI is a substrate for the caspase-3. D4-GDI was cleaved to a 23 kDa fragment by daunorubicin treatment in HL-60 cells with kinetics that parallel the onset of apoptosis. D4-GDI cleavage as well as DNA fragmentation was inhibited by treatment with Ac-DEVD-CHO but not with Ac-YVAD-CHO, a caspase-1 inhibitor. These data suggest that D4-GDI of Rho family GTPase may be regulated during apoptosis through the caspase-3 mediated cleavage of the GDI protein.
authors: Department of Physiology, School of Oriental Medicine, Won-Kwang University, Chonbuk, Korea.
authors: Kang-Beom
authors: KB
authors: Kwon
authors: Eun-Kyung
authors: EK
authors: Park
authors: Do-Gon
authors: DG
authors: Ryu
authors: Byung-Hyun
authors: BH
authors: Park
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology*; D053148:Caspase 3; D061945:Caspase Inhibitors; D020169:Caspases / Q000378:metabolism*; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology; D053938:DNA Fragmentation; D003630:Daunorubicin / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004789:Enzyme Activation; D020730:Guanine Nucleotide Dissociation Inhibitors / Q000378:metabolism*; D018922:HL-60 Cells; D006801:Humans; D009842:Oligopeptides / Q000494:pharmacology; D020741:rho GTP-Binding Proteins / Q000378:metabolism; D062949:rho Guanine Nucleotide Dissociation Inhibitor beta; D062947:rho-Specific Guanine Nucleotide Dissociation Inhibitors
chemical_list: C569658:ARHGDIB protein, human; D000970:Antineoplastic Agents; D061945:Caspase Inhibitors; D015853:Cysteine Proteinase Inhibitors; D020730:Guanine Nucleotide Dissociation Inhibitors; D009842:Oligopeptides; C099158:acetyl-aspartyl-glutamyl-valyl-aspartal; D062949:rho Guanine Nucleotide Dissociation Inhibitor beta; D062947:rho-Specific Guanine Nucleotide Dissociation Inhibitors; C505407:CASP3 protein, human; D053148:Caspase 3; D020169:Caspases; D020741:rho GTP-Binding Proteins; D003630:Daunorubicin