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Sesquiterpene lactones downregulate G2/M cell cycle regulator proteins and affect the invasive potential of human soft tissue sarcoma cells.
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Soft tissue sarcomas (STS) represent a rare group of malignant tumors that frequently exhibit chemotherapeutic resistance and increased metastatic potential. Many studies have demonstrated the great potential of plant-derived agents in the treatment of various malignant entities. The present study
Effect of costunolide and dehydrocostus lactone on cell cycle, apoptosis, and ABC transporter expression in human soft tissue sarcoma cells.
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Human soft tissue sarcomas represent a rare group of malignant tumours that frequently exhibit chemotherapeutic resistance and increased metastatic potential following unsuccessful treatment. In this study, we investigated the effects of costunolide and dehydrocostus lactone, which have been
Comparative study of lipid composition and proliferative activity of rat cholangiocarcinoma RS1 and sarcoma M1 depending on the transplantation organ.
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The proliferative activity and lipid composition (phospholipids, gangliosides) were studied in rat cholangiocarcinoma RS1 and sarcoma M1 transplanted subcutaneously or intrahepatically. The mitotic index was higher in the tumors transplanted into the heterologous organ. The total phospholipid and
The sesquiterpene lactone hymenoxon acts as a bifunctional alkylating agent.
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Hymenoxon, a toxic sesquiterpene lactone found in bitterweed, bound deoxyguanosine in a cell-free system and formed adducts with guanine residues in cellular DNA. The reactive dialdehyde form of hymenoxon formed stable Schiff base products with deoxyguanosine which were separable from unreacted
Mechanism of action of alpha-methylene-gamma-lactone derivatives of substituted nucleic acid bases in tumour cells.
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Some alpha-methylene-gamma-lactone derivatives of substituted nucleic acid bases, which showed significant antitumour activity against experimental tumours, were tested for their possible mechanism of action. Derivatives 1, 4 and 7 strongly inhibit active transport of uridine through sarcoma-180
Evaluation of the anticancer property of a new alpha-methylene-gamma-lactone derivative of phthalimide.
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The anticancer property of a new alpha-methylene-gamma-lactone derivative of phthalimide (2, NSC 640168) was evaluated in two murine ascitic tumors namely Ehrlich ascites carcinoma (EAC) and sarcoma-180 (S-180) by in vivo screenings and in a battery of human tumor cell lines by in vitro screening.
Relationship between lactone ring forms of HCPT and their antitumor activities.
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OBJECTIVE
To study the relationship between the lactone forms of 10-hydroxycamptothecin (HCPT) and their antitumor activities.
METHODS
Antitumor activity of the two forms of HCPT was studied in vitro using seven cultured human and mouse tumor cell lines. Mice bearing sarcoma 180 and solid hepatoma
Antitumor activity of norditerpenoid dilactones in Podocarpus plants: structure-activity relationship on in vitro cytotoxicity against Yoshida sarcoma.
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The in vitro cytotoxicity of norditerpenoid dilactones isolated from Podocarpus plants was determined against cultured Yoshida sarcoma cells. The dilactones involved 15 natural lactones as well as their derivatives, which include appropriate modifications necessary to the estimation of the
Consistent antibody response against ganglioside GD2 induced in patients with melanoma by a GD2 lactone-keyhole limpet hemocyanin conjugate vaccine plus immunological adjuvant QS-21.
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OBJECTIVE
Melanomas, sarcomas, and neuroblastomas abundantly express the ganglioside GD2 on the cell surface where it is susceptible to immune attack by antibodies. Overexpression of GD2 on these tumors is striking, as is the frequency of clinical responses after treatment of neuroblastoma with
The effect of withaferin A, a natural steroidal lactone, on the fine structure of S-180 tumor cells.
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Mouse sarcoma 180 (S-180) solid and ascites tumor cells were treated in vivo and in vitro with withaferin A and observed with the electron microscope. The compound was found to effect this spindle microtubules of cells in metaphase. An interesting finding was the double membranes surrounding the
DX-8951f: summary of phase I clinical trials.
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Exatecan mesylate (DX-8951f) is a new hexacyclic camptothecin analogue with favorable attributes compared to topotecan and CPT-11, including watersolubility, greater potency against topoisomerase I, lack of esterase-dependent activation, broad antitumor activity, and low cross-resistance against
Phase I dose escalation and pharmacokinetic study of oral gefitinib and irinotecan in children with refractory solid tumors.
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OBJECTIVE
This phase I study endeavored to estimate the maximum tolerated dose and describe the dose-limiting toxicities (DLTs) of oral irinotecan with gefitinib in children with refractory solid tumors.
METHODS
Oral irinotecan was administered on days 1-5 and 8-12 with oral gefitinib (fixed dose,
Metastatic melanoma cell heparanase. Characterization of heparan sulfate degradation fragments produced by B16 melanoma endoglucuronidase.
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Heparan sulfate (HS), a prominent component of vascular endothelial basal lamina, is cleaved into large Mr fragments and solubilized from subendothelial basal lamina-like matrix by metastatic murine B16 melanoma cells. We have examined the degradation products of HS and other purified
Apoptosis induction by 13-acetoxyrolandrolide through the mitochondrial intrinsic pathway.
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The aim of this study was to evaluate the mechanisms of cytotoxicity of the sesquiterpene lactone 13-acetoxyrolandrolide, a nuclear factor kappa B (NF-κB) inhibitor that was previously isolated from Rolandra fruticosa. The effects associated with the inhibition of the NF-κB pathway included
Toxicology and Carcinogenesis Studies of 8-Methoxypsoralen (CAS No. 298-81-7) in F344/N Rats (Gavage Studies).
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Oral administration of 8-methoxypsoralen followed by exposure to longwave ultraviolet light (primarily ultraviolet A, 320-400 nm) is used in the treatment of vitiligo and psoriasis. 8-Methoxypsoralen also occurs naturally in a variety of vegetables. Toxicology and carcinogenesis studies of
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