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14 rezultatima
Suppression of dolichol synthesis with isoprenoids and statins may potentiate the cancer-retardant efficacy of IGF-I down-regulation.
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Agents that inhibit the synthesis of mevalonate or of downstream isoprenoids block the G1-S transition and induce apoptosis in many cell lines; these agents include statins, phenylacetate, and a range of cyclic and acyclic isoprenoids. This cytostatic effect is mediated primarily by decreased
Cytotoxic and Antiproliferative Activity of Polyisoprenoids in Seventeen Mangroves Species Against WiDr Colon Cancer Cells
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Background: Secondary metabolites from the group of isoprenoid compounds are widely distributed in mangroveplants. Polyisoprenoids (dolichol and polyprenol) are known to have benefits as anticancer agents. The present studywas conducted to determine the cytotoxic potential of polyisoprenoids in
Gene within gene configuration and expression of the Drosophila melanogaster genes lethal(2) neighbour of tid [l(2)not] and lethal(2) relative of tid[l(2)rot].
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In this paper, we describe the structure and temporal expression pattern of the Drosophila melanogaster genes l(2)not and l(2)rot located at locus 59F5 vis à vis the tumor suppressor gene l(2)tid described previously and exhibiting a gene within gene configuration. The l(2)not protein coding region,
Inhibition of farnesyl protein transferase by monoterpene, curcumin derivatives and gallotannin.
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Ras proteins must be isoprenylated at a conserved cysteine residue near the carboxyl terminus (Cys-186 in mammalian Ras p21 proteins) in order to extend their biological activity. Previous studies have indicate an intermediate in the mevalonate pathway, most likely farnesyl pyrophosphate, is the
Hypothalamic digoxin mediated model for oncogenesis.
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This study assessed the changes in the isoprenoid pathway and its metabolites digoxin, dolichol and ubiquinone in neoplasms (CNS astrocytomas - glioblastoma multiforme and high grade non - Hodgkin's lymphoma). The following parameters were assessed-isoprenoid pathway metabolites, tyrosine and
Central role of hypothalamic digoxin in conscious perception, neuroimmunoendocrine integration, and coordination of cellular function: relation to hemispheric dominance.
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Alteration in the isoprenoid metabolites--digoxin, ubiquinone, and dolichol--have been reported in neuronal degeneration (Parkinson's disease), oncogenesis (central nervous system glioma), functional neuropsychiatric disorders (schizophrenia and epilepsy), and immune-mediated disorders (multiple
Hypothalamic digoxin--central role in conscious perception, neuroimmunoendocrine integration and coordination of cellular function--relation to hemispheric dominance.
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A family with a high prevalence of Parkinson's disease, schizophrenia, neoplasms, syndrome-X, rheumatoid arthritis and epilepsy has been described. The psychological behavioural patterns of the family were as follows--creativity and high IQ, hypersexual behaviour, reduced appetite and eating
Hypothalamic digoxin, hemispheric chemical dominance, and oncogenesis: evidence from multiple myeloma.
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This study assessed the changes in the isoprenoid pathway and its metabolites digoxin, dolichol, and ubiquinone in multiple myeloma. The isoprenoid pathway and digoxin status were also studied for comparison in individuals of differing hemispheric dominance to find out the rote of cerebral dominance
In vitro and in vivo downregulation of the ATP binding cassette transporter B1 by the HMG-CoA reductase inhibitor simvastatin.
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Extrusion of chemotherapeutics by ATP-binding cassette (ABC) transporters like ABCB1 (P-glycoprotein) represents a crucial mechanism of multidrug resistance in cancer therapy. We have previously shown that the 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitor simvastatin directly
Cholesterol and mevalonic acid modulation in cell metabolism and multiplication.
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Cholesterol in animals is a major structural component of cell membranes. It may therefore play a functional role in the modulation of cell osmolarity, the process of pinocytosis and the activities of membrane-associated proteins such as ionic pumps, immune responses, etc. A major relationship
Phenylacetate inhibits isoprenoid biosynthesis and suppresses growth of human pancreatic carcinoma.
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BACKGROUND
Phenylacetate is growth inhibitor for a variety of tumors at concentration that have been safely achieved in human beings. This antitumor effect is related to inhibition of the isoprenoid synthetic pathway by blocking the enzyme, mevalonate pyrophosphate (MVAPP) decarboxylase. The purpose
Synthesis and biological activity of polyprenols.
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The polyprenols and their derivatives are highlighted in this study. These lipid linear polymers of isoprenoid residues are widespread in nature from bacteria to human cells. This review primarily presents the synthesis and biological activities of polyprenyl derivatives. Attention is focused on the
Tunicamycin potentiates cisplatin anticancer efficacy through the DPAGT1/Akt/ABCG2 pathway in mouse Xenograft models of human hepatocellular carcinoma.
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Hepatocellular carcinoma is highly chemoresistant, and ATP-binding cassette subfamily G member 2 (ABCG2) is thought to play a critical role in this drug resistance. The present study aims to develop effective therapeutic strategies to decrease ABCG2 expression level and to surmount drug resistance
Potential antitumor effects of statins (Review).
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Statins, which have been introduced to the clinic for the treatment of hypercholesterolemia, are competitive inhibitors of 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase, the major rate-limiting enzyme that controls the conversion of HMG-CoA to mevalonic acid (MA). MA is the precursor in
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