Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound   Target Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound

---

Query: EC:3.4.22.56 (caspase-3)
35,750 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Mitochondria play a central role in controlling apoptosis, and activation of the caspase cascade appears to be crucial event during the apoptotic process. Human B lymphoma Raji cells are resistant to nuclear apoptosis induced by various stimuli. Using this cell line, we have asked whether reduction of the mitochondrial transmembrane potential and activation of caspase-3 are sufficient to induce DNA fragmentation during the apoptotic process. After stimulation with cell-permeable C2-ceramide or mitochondrial permeability transition (PT) inducers, not only apoptosis-sensitive cell lines (HL-60, Jurkat, and Daudi cells), but also Raji cells showed reduction of the mitochondrial transmembrane potential (triangle uppsim), activation of caspase-3, and loss of clonogenic potential. However, Raji cells did not show detectable levels of nuclear apoptosis (DNA degradation). In a cell-free system, cell lysates from tetra-butylhydroperoxide (t-BHP)-treated HL-60 cells induced DNA degradation of Raji nuclei, whereas cell lysates from t-BHP-treated Raji cells failed to induce DNA degradation in either apoptosis-sensitive cell lines or apoptosis-resistant Raji cells. Cleavage of DFF-45, which is a downstream target molecule for caspase-3, was observed in Raji cells as well as in apoptosis-sensitive Daudi cells. These results indicate that there is a defective apoptotic pathway in the cytoplasm downstream of caspase-3 in Raji cells.
...
PMID:Defective apoptotic signal transduction pathway downstream of caspase-3 in human B-lymphoma cells: A novel mechanism of nuclear apoptosis resistance. 1055 63

Most of malignant lymphomas have been shown to be relatively radiosensitive clinically, but some, especially recurrent ones, are frequently highly radioresistant. To clarify the origin of the difference, we examined ionizing radiation (IR)-induced apoptosis in three closely related human lymphoma cell lines (DL-40, DL-95, and DL-110) that differ in p53 status. DL-95 and DL-110 cells have a wild-type p53, whereas DL-40 cells carry a T to G transition in exon 5 of the p53 gene, resulting in a change of Cys to Phe at codon 176. Irradiation of DL-40 cells (mutant-type p53) with 5 Gy gamma-rays resulted in delayed apoptosis with membrane changes (annexin-V expression) 13 h after IR, and caspase-3 activation 23 h after IR, whereas apoptotic response was not identified in DL-95 cells until 48 h after IR in spite of their normal p53 status. Concerning DL-110 cells, delayed and reduced apoptotic response was revealed both microscopically and by DNA fragmentation assay. These results suggested that IR-induced apoptosis in DL-40 cells is mediated by a mechanism involving the caspase-3 cascade of the p53-independent pathway, and that some unknown mechanism inhibited IR-induced apoptosis in existence of wild-type p53, especially for DL-95 cells.
...
PMID:Ionizing radiation-induced apoptosis in human lymphoma cell lines differing in p53 status. 1063 91

4-Hydroxynonenal (HNE), a diffusible product of lipid peroxidation, has been suggested to be a key mediator of oxidative stress-induced cell death. In this study, we partially characterized the mechanism of HNE-mediated cytotoxicity. Incubation of human T lymphoma Jurkat cells with 20-50 microM HNE led to cell death accompanied by DNA fragmentation. Western blot analysis showed that HNE-treatment induced time- and dose-dependent activation of caspase-8, caspase-9 and caspase-3. HNE-induced caspase-3 processing was confirmed by a flow cytometric demonstration of increased catalytic activity on the substrate peptide. HNE treatment also led to remarkable cleavage of poly(ADP-ribose) polymerase (PARP), which was prevented by pretreatment of cells with DEVD-FMK as a caspase-3 inhibitor. The HNE-mediated activation of caspases, cleavage of PARP and DNA fragmentation were blocked by antioxidants cysteine, N-acety-L-cysteine and dithiothreitol, but not by two other HNE-reactive amino acids lysine and histidine, or by cystine, the oxidized form of cysteine. HNE rapidly decreased levels of intracellular reduced glutathione (GSH) and its oxidized form GSSG, and these were also attenuated by the reductants. Coincubation of Jurkat cells with a blocking anti-Fas antibody prevented Fas-induced but not HNE-induced activation of caspase-3. HNE also activated caspase-3 in K562 cells that do not express functional Fas. Our results thereby demonstrate that HNE triggers oxidative stress-linked apoptotic cell death through activation of the caspase cascade. The results also suggest a possible mechanism involving a direct scavenge of intracellular GSH by HNE.
...
PMID:4-hydroxynonenal induces a cellular redox status-related activation of the caspase cascade for apoptotic cell death. 1065 56

We compared the expression of cell adhesion molecules (CAMs), cytotoxic granule proteins, and apoptosis-related proteins by immunohistology and in situ terminal deoxynucleotidyl transferase-mediated digoxigenin-dUTP nick end labeling (TUNEL) of 10 cases of cutaneous CD56+ NK/T cell lymphoma with and 6 cases without angiodestruction. Lymphoma cells in cases with angiodestruction frequently expressed CAMs CD2, CD11a, and CD49d and their ligands CD58, CD54, and CD106 and were positive for CD122 and cytotoxic granule proteins TIA1, perforin, and granzyme B. Lymphoma cells in cases without angiodestruction mostly were negative for CD2, CD58, CD54, CD106, and TIA1 and weakly positive for perforin and granzyme B. In the TUNEL method, mean apoptotic indices (AI) for cases with angiodestruction showed a higher percentage than those without angiodestruction. CD95L, CD95, apoptosis-induced cysteine protease CPP32, apoptosis-promoting protein Bax, and proliferating marker (MIB1) frequently were positive in the lymphoma cells of cases with angiodestruction, but there was no expression of apoptosis-inhibitor protein Bcl2. In most cases without angiodestruction, lymphoma cells were positive for CD95L and Bax and negative for CD95, CPP32, and MIB1. CAMs and the 3 cytotoxic granule proteins and an apoptosis pathway might be important factors in the paracrine and autocrine mechanisms of tissue necrosis in cutaneous CD56+ NK/T cell lymphoma.
...
PMID:Angiodestruction and tissue necrosis of skin-involving CD56+ NK/T-cell lymphoma are influenced by expression of cell adhesion molecules and cytotoxic granule and apoptosis-related proteins. 1066 22

Some, but not all, of a series of novel pyrrolo-1,5-benzoxazepines (PBOXs) induce apoptosis as shown by cell shrinkage, chromatin condensation, and DNA fragmentation in three human cell lines, HL-60 promyelocytic, Jurkat T lymphoma, and Hut-78 s.c. lymphoma cells. This chemical selectivity, together with the lack of apoptotic activity against rat Leydig cells, argues against a general cell poisoning effect. PBOX-6, a potent member of the series, caused activation of a member of the caspase-3 family of proteases. In addition, the caspase-3-like inhibitor z-DEVD-fmk, but not the caspase-1-like inhibitor z-YVAD-fmk prevented PBOX-6-induced apoptosis, suggesting that caspase 3-like proteases are involved in the mechanism by which PBOX compounds induce apoptosis. The release of cytochrome c into the cytosol in HL-60 cells in response to PBOX-6 suggests that this cellular response may be important in the mechanism by which PBOX-6 induces apoptosis. However, reactive oxygen intermediates do not play a key role in PBOX-6-induced apoptosis because neither the free radical scavenger TEMPO nor the antioxidant N-acetylcysteine had any effect on PBOX-6-induced apoptosis. The apoptotic induction seems independent of the mitochondrial peripheral-type benzodiazepine receptor (PBR) that binds these pyrrolobenzoxazepines with high affinity, due to the lack of correlation between their affinities for the receptor and their apoptotic potencies, their high apoptotic activity in PBR-deficient cells such as Jurkats, and their lack of apoptotic induction in PBR-rich rat Leydig cells. These PBOXs also can overcome nuclear factor-kappaB-mediated resistance to apoptosis. This suggests an important potential use of these compounds in drug-resistant cancers.
...
PMID:Pyrrolo-1,5-benzoxazepines induce apoptosis in HL-60, Jurkat, and Hut-78 cells: a new class of apoptotic agents. 1073 52

Polypeptide chain initiation factor eIF4GI undergoes caspase-mediated degradation during apoptosis to give characteristic fragments. The most prominent of these has an estimated mass of approximately 76 kDa (Middle-Fragment of Apoptotic cleavage of eIF4G; M-FAG). Subcellular fractionation of the BJAB lymphoma cell line after induction of apoptosis indicates that M-FAG occurs in both ribosome-bound and soluble forms. Affinity chromatography on m7GTP-Sepharose shows that M-FAG retains the ability of eIF4GI to associate with both the mRNA cap-binding protein eIF4E and initiation factor eIF4A and that the ribosome-bound form of M-FAG is also present as a complex with eIF4E and eIF4A. These data suggest that the binding sites for eIF4E, eIF4A and eIF3 on eIF4GI are retained in the caspase-generated fragment. M-FAG is also a substrate for cleavage by the Foot-and-Mouth-Disease Virus-encoded L protease. These properties, together with the pattern of recognition by a panel of antibodies, define the origin of the apoptotic cleavage fragment. N-terminal sequencing of the products of caspase-3-mediated eIF4GI cleavage has identified the major cleavage sites. The pattern of eIF4GI degradation and the possible roles of the individual cleavage products in cells undergoing apoptosis are discussed.
...
PMID:Cleavage of polypeptide chain initiation factor eIF4GI during apoptosis in lymphoma cells: characterisation of an internal fragment generated by caspase-3-mediated cleavage. 1088 7

The endocannabinoid anandamide (AEA) is shown to induce apoptotic bodies formation and DNA fragmentation, hallmarks of programmed cell death, in human neuroblastoma CHP100 and lymphoma U937 cells. RNA and protein synthesis inhibitors like actinomycin D and cycloheximide reduced to one-fifth the number of apoptotic bodies induced by AEA, whereas the AEA transporter inhibitor AM404 or the AEA hydrolase inhibitor ATFMK significantly increased the number of dying cells. Furthermore, specific antagonists of cannabinoid or vanilloid receptors potentiated or inhibited cell death induced by AEA, respectively. Other endocannabinoids such as 2-arachidonoylglycerol, linoleoylethanolamide, oleoylethanolamide, and palmitoylethanolamide did not promote cell death under the same experimental conditions. The formation of apoptotic bodies induced by AEA was paralleled by increases in intracellular calcium (3-fold over the controls), mitochondrial uncoupling (6-fold), and cytochrome c release (3-fold). The intracellular calcium chelator EGTA-AM reduced the number of apoptotic bodies to 40% of the controls, and electrotransferred anti-cytochrome c monoclonal antibodies fully prevented apoptosis induced by AEA. Moreover, 5-lipoxygenase inhibitors 5,8,11,14-eicosatetraynoic acid and MK886, cyclooxygenase inhibitor indomethacin, caspase-3 and caspase-9 inhibitors Z-DEVD-FMK and Z-LEHD-FMK, but not nitric oxide synthase inhibitor Nomega-nitro-l-arginine methyl ester, significantly reduced the cell death-inducing effect of AEA. The data presented indicate a protective role of cannabinoid receptors against apoptosis induced by AEA via vanilloid receptors.
...
PMID:Anandamide induces apoptosis in human cells via vanilloid receptors. Evidence for a protective role of cannabinoid receptors. 1091 56

FTY720 has immunosuppressive activity in experimental organ transplantation and shows a prompt and protracted decrease of blood T lymphocytes upon oral administration. The blood lymphocyte decrease in vivo was mainly a result of FTY720-induced apoptosis. However, this apoptotic mechanism is not well understood. We examined the mechanism of FTY720-induced apoptosis in lymphoma. Western blotting and fluorescent caspase-specific substrate revealed that caspase-3 is involved in FTY720-induced apoptosis, whereas caspase-1 is not. Apoptotic cell death was inhibited by the pan-caspase inhibitor, Z-VAD-FMK, suggesting that caspase activation is essential for FTY720-induced apoptosis. FTY720 reduced mitochondrial transmembrane potential and released cytochrome c from the mitochondria of intact cells as well as in a cell-free system even in the presence of Z-VAD-FMK. As these mitochondrial reactions occurred before caspase activation, we concluded that FTY720 directly influences mitochondrial functions. The inhibition of mitochondrial permeability transition by Bcl-2 overexpression or by chemical inhibitors prevented all apoptotic events occurring in intact cells and in a cell-free system. Moreover, using a cell-free system, FTY720 did not directly affect isolated nuclei or cytosol. These results indicate that FTY720 directly affects mitochondria and triggers permeability transition to induce further apoptotic events.
...
PMID:Immunosuppressant FTY720 induces apoptosis by direct induction of permeability transition and release of cytochrome c from mitochondria. 1097 41

Lymphoma cells often display in vitro resistance to FAS-induced apoptosis, in which caspases act as crucial cell death effectors. Following FAS stimulation, caspase-8 activates caspase-3, which in turn activates the caspase-activated DNAse (CAD) by proteolysis of its inhibitor (ICAD). To investigate the mechanism of FAS resistance, the expression of caspase-8 was analysed by immunohistochemistry, together with that of the substrates caspase-3 and ICAD, in 52 representative samples from non Hodgkin's lymphoma (NHL), 12 from Hodgkin's disease (HD), and eight benign lymphoid tissues. In benign tissues, caspase-8 was co-expressed with caspase-3 in the cytoplasm in germinal centre (GC) cells and was co-expressed with ICAD in the nuclei of the mantle and marginal zone cells. ICAD expression was weak or absent in GC cells. Cytoplasmic staining for both caspase-8 and caspase-3 was present in 11/12 cases of diffuse large cell B-NHL. Caspase-8 positivity was nuclear and cytoplasmic in 9/9 follicular NHLs, in 5/5 mantle cell NHLs and in 6/6 marginal zone NHLs. Five out of six peripheral T-cell NHLs expressed cytoplasmic caspase-8. Ten out of the 12 HD cases lacked significant cytoplasmic staining for caspase-3 and caspase-8 in the majority of Reed-Sternberg cells. All lymphoma cases exhibited predominant nuclear ICAD positivity. Subcellular fractionation analysis of three lymphoma samples and normal mantle zone cells confirmed that ICAD and caspase-8 were at least partly localized in the nucleus. These results show that the profile of caspase-8 expression is correlated with histological lymphoma subtypes; that caspase-8 is co-expressed with caspase-3 in GC cells and their neoplastic counterparts; that ICAD has an immunohistochemical nuclear localization in vivo; and that caspase-8 and ICAD can be co-expressed in the nuclei of mantle zone and marginal zone cells; their unexpected nuclear localization allows a reappraisal of the biochemical cascade of caspase activation.
...
PMID:Frequent nuclear localization of ICAD and cytoplasmic co-expression of caspase-8 and caspase-3 in human lymphomas. 1100 95

There are at least three types of inositol 1,4,5-trisphosphate receptor (IP(3)R) [IP(3)-gated Ca(2+)channels], which are expressed in different cell types and mammalian tissues. In this study, we have identified three IP(3)R subtypes in human Jurkat T-lymphoma cells. All three subtypes have a molecular mass of about 260 kDa, and display Ca(2+)channel properties in an IP(3)-dependent manner. We have also demonstrated that TNFalpha promotes the activity of different proteases (e.g. caspase-8, caspase-3 and calpain), alters the TCR-mediated Ca(2+)response and subsequently induces apoptosis in Jurkat cells. During the first 6 h of incubation with TNFalpha, several IP(3)R subtype-related changes occur (e.g. proteolysis of IP(3)R subtypes, inhibition of IP(3)binding and impairment of IP(3)-mediated Ca(2+)flux) concomitantly with an elevation of protease (caspase-8, caspase-3 and calpain) activity. Furthermore, the caspase inhibitor, Z-VAD-fmk, significantly reduces TNFalpha-mediated perturbation of IP(3)R1 and IP(3)R2 (but not IP(3)R3) function; whereas the calpain inhibitor I, ALLN, is capable of blocking the inhibitory effect of TNFalpha on IP(3)R3 function. These findings suggest that IP(3)R1 and IP(3)R2 serve as cellular substrates for caspases, and IP(3)R3 is a substrate for calpain. We propose that the selective down-regulation of IP(3)R subtype-mediated Ca(2+)function by caspase-dependent and calpain-sensitive mechanisms may be responsible for the early onset of the apoptotic signal by TNFalpha in human T-cells.
...
PMID:Selective down-regulation of IP(3)receptor subtypes by caspases and calpain during TNF alpha -induced apoptosis of human T-lymphoma cells. 1101 62


<< Previous 1 2 3 4 5 6 7 8 9 10 Next >>

---