diacylglycerol/neoplasms

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Monogalactosyl diacylglycerol, a replicative DNA polymerase inhibitor, from spinach enhances the anti-cell proliferation effect of gemcitabine in human pancreatic cancer cells.

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BACKGROUND Gemcitabine (GEM) is used to treat various carcinomas and represents an advance in pancreatic cancer treatment. In the screening for DNA polymerase (pol) inhibitors, a glycoglycerolipid, monogalactosyl diacylglycerol (MGDG), was isolated from spinach. METHODS Phosphorylated GEM

Mechanisms in the chemoprevention of colon cancer: modulation of protein kinase C, tyrosine protein kinase and diacylglycerol kinase activities by 1,4-phenylenebis-(methylene)selenocyanate and impact of low-fat diet.

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Epidemiological and experimental studies suggest an inverse relationship between the intake of dietary selenium and/or low fat-intake and colon cancer risk. Efficacy studies in rodents suggest that the organoselenium compound 1, 4-phenylenebis(methylene)selenocyanate (p-XSC), is a more effective and

Diacylglycerol (DAG)-lactones, a new class of protein kinase C (PKC) agonists, induce apoptosis in LNCaP prostate cancer cells by selective activation of PKCalpha.

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Phorbol esters, the archetypical (PKC) activators, induce apoptosis in androgen-sensitive LNCaP prostate cancer cells. In this study we evaluate the effect of a novel class of PKC ligands, the diacylglycerol (DAG)-lactones, as inducers of apoptosis in LNCaP cells. These unique ligands were designed

The hormone-sensitive hepatic Na+-pump. Evidence for regulation by diacylglycerol and tumor promoters.

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Ouabain-sensitive 86Rb+ uptake by isolated rat hepatocytes was studied to elucidate how Ca2+-mobilizing hormones stimulate the Na+-pump. Stimulation of this uptake was observed with concentrations of vasopressin ([8-arginine]vasopressin, AVP), angiotensin II, and norepinephrine which elicited Ca2+

Effect of amount and types of dietary fat on intestinal bacterial 7 alpha-dehydroxylase and phosphatidylinositol-specific phospholipase C and colonic mucosal diacylglycerol kinase and PKC activities during stages of colon tumor promotion.

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It is evident from many studies that the effect of dietary fat on colon tumor promotion depends not only on the amount of fat but especially on fatty acid composition. Animal model studies have shown that diets which are high in omega-6 fatty acids increase colon tumor promotion, whereas diets rich

Oral administration of monogalactosyl diacylglycerol from spinach inhibits colon tumor growth in mice.

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Previously, we observed that purified monogalactosyl diacylglycerol (MGDG), a major glycoglycerolipid from spinach, selectively inhibits the activities of mammalian replicative DNA polymerases (α, δ and ε). However, the function of MGDG following ingestion is not well-known. In the present study,

Alpha-linolenic acid-enriched diacylglycerol oil does not promote tumor development in tongue and gastrointestinal tract tissues in a medium-term multi-organ carcinogenesis bioassay using male F344 rat.

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Alpha-linolenic acid (ALA)-enriched diacylglycerol (DAG) oil is an edible oil enriched with DAG (>80%) and ALA (>50%). The present study investigated whether ALA-DAG oil promotes tumorigenesis in the tongue and gastrointestinal tract, using a rat medium-term multi-organ carcinogenesis bioassay

No enhancing effects of diacylglycerol oil on tumor development in a medium-term multi-organ carcinogenesis bioassay using male F344 rats.

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The modifying potential of diacylglycerol (DAG) oil on tumor development was investigated in a medium-term multi-organ carcinogenesis bioassay. DAG oil is a cooking oil that contains >80% diglycerides, <20% triglycerides and <5% monoglycerides. Male 6-week-old F344 rats (20 in each group) were

Diacylglycerols enhance the anti-tumor effect of glucocorticoid on L5178Y lymphoblasts in vivo.

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1,2-Dioleoyl-rac-glycerol, a potent activator of protein kinase C, was found to enhance the growth-inhibitory effect of triamcinolone acetonide on L5178Y lymphoblasts in adrenalectomized, male DBA/2 mice. On the other hand, in mice without adrenalectomy, it markedly inhibited tumor growth without

Biological regulation of diacylglycerol kinases in normal and neoplastic tissues: New opportunities for cancer immunotherapy.

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In the recent years, the arsenal of anti-cancer therapies has evolved to target T lymphocytes and restore their capacity to destroy tumor cells. However, the clinical success is limited, with a large number of patients that never responds and others that ultimately develop resistances. Overcoming

Diacylglycerol kinases in cancer.

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Diacylglycerol kinases (DGK) are a family of enzymes that catalyze the transformation of diacylglycerol into phosphatidic acid. In T lymphocytes, DGKα and ζ limit the activation of the PLCγ/Ras/ERK axis, providing a critical checkpoint to inhibit T cell responses. Upregulation of these isoforms

Synergistic control of T cell development and tumor suppression by diacylglycerol kinase alpha and zeta.

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Diacylglycerol (DAG) kinases (DGKs) are a family of enzymes that convert DAG to phosphatidic acid (PA), the physiologic functions of which have been poorly defined. We report here that DGK alpha and zeta synergistically promote T cell maturation in the thymus. Absence of both DGKalpha and zeta

Diacylglycerol kinase α is a critical signaling node and novel therapeutic target in glioblastoma and other cancers.

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Although diacylglycerol kinase α (DGKα) has been linked to several signaling pathways related to cancer cell biology, it has been neglected as a target for cancer therapy. The attenuation of DGKα activity via DGKα-targeting siRNA and small-molecule inhibitors R59022 and R59949 induced

A novel diacylglycerol kinase α-selective inhibitor, CU-3, induces cancer cell apoptosis and enhances immune response.

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Diacylglycerol kinase (DGK) consists of 10 isozymes. The α-isozyme enhances the proliferation of cancer cells. However, DGKα facilitates the nonresponsive state of immunity known as T-cell anergy; therefore, DGKα enhances malignant traits and suppresses immune surveillance. The aim of this study was

Diacylglycerol kinase α-selective inhibitors induce apoptosis and reduce viability of melanoma and several other cancer cell lines.

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Diacylglycerol (DG) kinase (DGK), which phosphorylates DG to generate phosphatidic acid (PA), consists of ten isozymes (α-к). Recently, we identified a novel small molecule inhibitor, CU-3, that selectively inhibits the activity of the α isozyme. In addition, we newly obtained Compound A, which

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