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9 resultados
Chemical modification of santonin into a diacetoxy acetal form confers the ability to induce differentiation of human promyelocytic leukemia cells via the down-regulation of NF-kappaB DNA binding activity.
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Many sesquiterpene lactone compounds either induce or enhance the cell differentiation of human leukemia cells. However, we reported in a previous study that santonin, a eudesmanolide sesquiterpene lactone, exerts no effects on the differentiation of leukemia cells. In this report, to evaluate the
Synthesis of diacetoxy acetal derivatives of santonin and their enhancing effects on HL-60 leukemia cell differentiation.
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Several diacetoxy acetal analogues have been synthesized from santonin and assessed for their ability of inducing or enhancing the differentiation of human HL-60 leukemia cells. The compounds themselves had little effect on HL-60 cell differentiation. However, three analogues, 2a, 3a, and 5b,
Synthesis of C (6)-epimer derivatives of diacetoxy acetal derivative of santonin and their inducing effects on HL-60 leukemia cell differentiation.
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Induction of differentiation is a new and promising approach to leukemia therapy, well illustrated by the treatment of acute promyelocytic leukemia with 1,25-dihydroxyvitamin D(3) [1,25-(OH)(2)D(3)] or all-trans retinoic acid (ATRA). Using combination of either 1,25-(OH)(2)D(3) or ATRA and
Induction of G₂/M arrest, caspase activation and apoptosis by α-santonin derivatives in HL-60 cells.
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Sesquiterpene lactones (SLs) are natural products with a variety of biological activities. Previously, we demonstrated the cytotoxic effects of three new α-santonin derivatives on different tumor cell lines with low toxic effects upon peripheral human leukocytes. Here, we evaluated the mechanism of
Synthesis of DAAS derivatives and their enhancement of HL-60 leukemia cell differentiation.
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DAAS is the diacetoxy acetal derivative of a-santonin and induces HL-60 cell differentiation into granulocytes. In this report, we investigated the structure-activity relationship (SAR) of DAAS derivatives in the differentiation of human HL-60 leukemia cells. Although its derivatives themselves had
Enhancement of 1 alpha,25-dihydroxyvitamin D(3)-induced differentiation of human leukaemia HL-60 cells into monocytes by parthenolide via inhibition of NF-kappa B activity.
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1. Transcription factors such as NF-kappa B provide powerful targets for drugs to use in the treatment of cancer. In this report parthenolide (PT), a sesquiterpene lactone of herbal remedies such as feverfew (Tanacetum parthenium) with NF-kappa B inhibitory activity, markedly increased the degree of
Synthesis and cytotoxic activity of alpha-santonin derivatives.
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Ten alpha-santonin derivatives were synthesized in moderate to high yields. Four derivatives namely 10alpha-acetoxy-3-oxo-1,7alphaH,6,11betaH-guai-4-en-6,12-olide (2), isofotosantonic acid (3), 10alpha-hydroxy-3-oxo-1,7alphaH,6,11betaH-guai-4-en-6,12-olide (4), and lumisantonin (5), were prepared by
Selective Cytotoxicity of α-Santonin from the Persian Gulf Sponge Dysidea Avara on Pediatric ALL B-lymphocytes via Mitochondrial Targeting
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Background: Acute lymphoblastic leukemia (ALL) is one of the most dominant malignancies among children, characterized by production of immature and dysfunctional blasts which are resistant to cytotoxic chemotherapeutic agents. Therefore, research protocols are currently focusing on discovery of
Studies on the synthesis of sesquiterpene lactones, 12. Synthesis of (+)-colartin, (+)-arbusculin A, and their C-4 epimers and their biological activities.
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Colartin [9] and arbusculin A [11] have been synthesized from alpha-santonin [1] in 14.5% (11 steps) and 9.3% (13 steps) overall yields, respectively. Arbusculin A [11] and compounds 20, 21, and 22, which were derived from intermediate 2, showed significant cell growth inhibitory activity against
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