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13 Ergebnisse
Kaurene diterpene induces apoptosis in human leukemia cells partly through a caspase-8-dependent pathway.
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Defects in apoptosis signaling pathways contribute to tumorigenesis and drug resistance, and these defects are often a cause of failure of chemotherapy. Thus, a major goal in chemotherapy is to find cytotoxic agents that restore the ability of tumor cells to undergo apoptosis. We previously found
Caracasine acid, an ent-3,4-seco-kaurene, promotes apoptosis and cell differentiation through NFkB signal pathway inhibition in leukemia cells.
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Caracasine acid (CA) is an ent-3,4-seco-kaurene isolated from the plant Croton micans. Decreased cancer cell lines viability was reported upon CA treatment. The present study aimed to investigate the mechanism of CA induced cytotoxicity using two human cell lines, Jurkat E6.1 (human cell T lymphoma)
An ent-kaurene diterpene enhances apoptosis induced by tumor necrosis factor in human leukemia cells.
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Some antitumor agents, including tumor necrosis factor-alpha (TNF-alpha) and camptothecin (CPT), often cause resistance of tumor cells to antitumor agents through activation of the nuclear factor-kappa B (NF-kappa B) pathway that leads to up-regulation of anti-apoptotic proteins. Therefore,
Excisanin H, a novel cytotoxic 14,20-epoxy-ent-kaurene diterpenoid, and three new ent-kaurene diterpenoids from Rabdosia excisa.
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A novel 14,20-epoxy-ent-kaurene diterpenoid, excisanin H (1), and three new ent-kaurene diterpenoids, 2-4, were isolated from aerial parts of Rabdosia excisa along with eight known ent-kaurene diterpenoids, 5-12. The structural elucidations were made using spectral (HREIMS, IR, (1)H, (13)C, and 2D
New ent-kaurene-type diterpenoids possessing cytotoxicity from the New Zealand liverwort Jungermannia species.
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Two new ent-kaurene-type and a new rearranged ent-kaurene-type diterpenoids possessing cytotoxicity against a human leukemia cell line have been isolated from the New Zealand liverwort Jungermannia species, together with previously known ent-kaurene-type diterpenoids. Their structures were
A comparison of apoptosis and necrosis induced by ent-kaurene-type diterpenoids in HL-60 cells.
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We previously reported that ent-11alpha-hydroxy-16-kauren-15-one (KD) induces apoptosis through a caspase-dependent pathway and the induction of apoptosis is dependent on its enone group in human leukemia cells. Here we investigated the abilities of some KD-related compounds with enone group (Fig.
Activation of p38 mitogen-activated protein kinase during ent-11alpha-hydroxy-16-kauren-15-one-induced apoptosis in human leukemia HL-60 cells.
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Kaurene-type diterpenes possess various biological activities including antitumor and anti-inflammatory effects. Indeed, we have found that an ent-kaurene diterpene, ent-11alpha-hydroxy-16-kauren-15-one (KD), induced apoptosis via caspase-8 activation in human promyelocytic leukemia HL-60 cells.
Induction of apoptosis by new ent-kaurene-type diterpenoids isolated from the New Zealand liverwort Jungermannia species.
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Some diterpenoids show various biological activities, including anti-inflammatory, anti-HIV and anti-tumor activity. Previously, we have focused our research on the apoptosis-inducing properties of diterpenoids and found that some ent-kaurene-type diterpenoids induced apoptosis in human leukemia
Pharicin A, a novel natural ent-kaurene diterpenoid, induces mitotic arrest and mitotic catastrophe of cancer cells by interfering with BubR1 function.
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In this study, we report the functional characterization of a new ent-kaurene diterpenoid termed pharicin A, which was originally isolated from Isodon, a perennial shrub frequently used in Chinese folk medicine for tumor treatment. Pharicin A induces mitotic arrest in leukemia and solid
[Apoptosis-inducing properties of ent-kaurene-type diterpenoids from the liverwort Jungermannia truncata].
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Ent-11alpha-hydroxy-16-kauren-15-one (1) induced apoptosis in a human leukemia cell line (HL-60 cells), however, the apoptosis-inducing properties of 1 and its related compounds remain to be proved. We examined the involvement of caspases, a family of cysteine aspartic proteases, which play a
Synthesis of 1-O-monoacyl or 12-O-monoacyl, 1-,12-O-diacyl-, and 11,12-dehydrated excisanin A 7,14-acetonides and their cytotoxic activity.
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1-O-Monoacyl, 12-O-monoacyl, 1-,12-O-diacyl, and 11,12-dehydrated excisanin A 7,14-acetonides were synthesized from excisanin A isolated from Rabdosia excisa. The structure and cytotoxic activity relationships (SAR) of the natural parent ent-kaurene diterpenes and these semisynthetic analogues were
Synthesis and Cytotoxicity Assessment of Novel 7-O- and 14-O-Derivatives of Glaucocalyxin A.
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Pharicin B stabilizes retinoic acid receptor-α and presents synergistic differentiation induction with ATRA in myeloid leukemic cells.
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All-trans retinoic acid (ATRA), a natural ligand for the retinoic acid receptors (RARs), induces clinical remission in most acute promyelocytic leukemia (APL) patients through the induction of differentiation and/or eradication of leukemia-initiating cells. Here, we identify a novel natural
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