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l arginine/sarcoma
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Direct correlation between expression of endogenous inducible nitric oxide synthase and regression of M5076 reticulum cell sarcoma hepatic metastases in mice treated with liposomes containing lipopeptide CGP 31362.
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The purpose of this study was to determine whether the activation of inducible nitric oxide synthase (iNOS) can serve as a target for immunotherapeutic agents for treatment of murine reticulum cell sarcoma metastases. Liver metastases were established by the i.v. injection of M5076 cells into
Dietary arginine influences Rous sarcoma growth in a major histocompatibility B complex progressor genotype.
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L-Arginine (L-Arg) can serve as a substrate for the production of reactive nitrogen intermediates. One of these metabolites, nitric oxide, has been shown to possess significant antitumor properties in vitro. To investigate the importance of this system in vivo, we have examined the dietary L-Arg
L-arginine supplementation does not affect chemically induced carcinogenesis and tumor growth in BALB-c mice.
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T-cell zeta-chain downregulation is common in various types of cancer and it is proposed as a mechanism of cancer immunosubversion. L-arginine consumption by arginase rich suppressor myeloid cells has been incriminated. The effect of L-arginine supplementation on chemically induced carcinogenesis
Arginine metabolism in soft tissue sarcoma.
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BACKGROUND
L-Arginine (L-Arg) is a conditionally essential amino acid for humans, which is the substrate for both arginase (ARG) and the inducible form of nitric oxide synthase (iNOS) enzymes. Whether L-Arg metabolism has detrimental or beneficial influence on the tumor growth depends on local up
Enhancing effect of polyamines on yield of film sarcoma.
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The salts of the natural polyamines, protamine sulphate, clupeine sulphate, spermidine phosphate, putrescine dihydrochloride and spermine diphosphate, and of the synthetic poly-L-lysine hydrobromide (mol. wt 85 k) and poly-L-arginine hydrochloride (mol. wt 50 k) were tested for their effect on film
A short review on creatine-creatine kinase system in relation to cancer and some experimental results on creatine as adjuvant in cancer therapy.
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The creatine/creatine kinase (CK) system plays a key role in cellular energy buffering and transport. In vertebrates, CK has four isoforms expressed in a tissue-specific manner. In the process of creatine biosynthesis several other important metabolites are formed. The anticancer effect of creatine
Differentially expressed kinase genes associated with trypsinogen activation in rat pancreatic acinar cells treated with taurolithocholic acid 3-sulfate.
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Trypsinogen activation is the initial factor involved in the development of all types of acute pancreatitis (AP) and has been suggested to be regulated by protein kinases. In the present study, AR42J rat pancreatic acinar cells were treated with taurolithocholic acid 3-sulfate (TLC-S), and
Staphylococcal entertotoxins of the enterotoxin gene cluster (egcSEs) induce nitrous oxide- and cytokine dependent tumor cell apoptosis in a broad panel of human tumor cells.
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The egcSEs comprise five genetically linked staphylococcal enterotoxins, SEG, SEI, SElM, SElN, and SElO and two pseudotoxins which constitute an operon present in up to 80% of Staphylococcus aureus isolates. A preparation containing these proteins was recently used to treat advanced lung cancer with
Non-invasive imaging of combretastatin activity in two tumor models: Association with invasive estimates.
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BACKGROUND
The efficacy of the vascular disrupting agent combretastatin A-4 phosphate (CA4P) depends on several factors including tumor size, nitric oxide level, interstitial fluid pressure, and vascular permeability. These factors vary among tumor types. The aim of this study was to investigate all
Determinants of anti-vascular action by combretastatin A-4 phosphate: role of nitric oxide.
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The anti-vascular action of the tubulin binding agent combretastatin A-4 phosphate (CA-4-P) has been quantified in two types of murine tumour, the breast adenocarcinoma CaNT and the round cell sarcoma SaS. The functional vascular volume, assessed using a fluorescent carbocyanine dye, was
Nitric oxide synthase inhibition enhances the tumor vascular-damaging effects of combretastatin a-4 3-o-phosphate at clinically relevant doses.
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OBJECTIVE
The therapeutic potential of combining the prototype tumor vascular-disrupting agent combretastatin A-4 3-O-phosphate (CA-4-P) with systemic nitric oxide synthase (NOS) inhibition was investigated preclinically.
METHODS
Vascular response (uptake of (125)I-labeled iodoantipyrine; laser
L-Canavanine modulates cellular growth, chemosensitivity and P-glycoprotein substrate accumulation in cultured human tumor cell lines.
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L-Canavanine (L-CAV) is a naturally occurring L-arginine analog that induces the formation of non-functional proteins in a variety of organisms. Previous studies have shown that L-CAV is cytotoxic for several human tumor cell lines. In this study, we have evaluated the cytotoxicity of L-CAV for both
Experimental evidence for the existence of the passive antitumor defense system formed by the synergistic action of certain small substances of the circulatory system.
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In AIDS, only a few types of tumors (mainly Kaposi's sarcoma and non-Hodgkin's lymphoma) increase in incidence despite global abnormalities in the immune system. In addition, the reason for the higher incidence of these tumors is not immunosuppression but other agents. This shows that the immune
A mixture of amino acids and other small molecules present in the serum suppresses the growth of murine and human tumors in vivo.
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Previously we have hypothesized that the small molecules which are selectively accumulated in cancer cells might participate in a non-immunological antitumor surveillance mechanism. We demonstrated earlier that a mixture of experimentally selected substances ("active mixture", AM: L-arginine,
Nitric oxide production in relation to spontaneous B-cell lymphoma and myositis in SJL mice.
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SJL mice spontaneously develop B cell lymphomas (historically described as reticulum cell sarcomas) by 12 months of age and inflammatory muscle disease (myositis) by 6 months of age. Tumors originate in mesenteric lymph nodes and in Peyer's patches and resemble human germinal center lymphomas. The
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