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Strana 1 od 17 výsledky
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
[Role of arginase-1 expression in distinguishing hepatocellular carcinoma from non-hepatocellular tumors].
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OBJECTIVE
To study the role of arginase-1 (Arg-1) expression in differential diagnosis of hepatocellular carcinoma (HCC), Arg-1 staining pattern in clear cell neoplasm (HCC and non-HCC) and Arg-1 expression in non-hepatocellular tumors.
METHODS
Seventy-eight cases of HCC (including 8 cases of clear
An orthotopic xenograft model with survival hindlimb amputation allows investigation of the effect of tumor microenvironment on sarcoma metastasis.
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Overall survival rates for pediatric high-grade sarcoma have improved greatly in the past few decades, but prevention and treatment of distant metastasis remain the most compelling problems facing these patients. Traditional preclinical mouse models have not proven adequate to study the biology and
Arginine auxotrophic gene signature in paediatric sarcomas and brain tumours provides a viable target for arginine depletion therapies.
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Paediatric sarcomas and brain tumours, remain cancers of significant unmet need, with a poor prognosis for patients with high risk disease or those who relapse, and significant morbidities from treatment for those that survive using standard treatment approaches. Novel treatment strategies, based on
Tumorilysin collected in diffusion chambers and restraint of foreign body tumorigenesis.
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Tumorilysin was found in diffusion chambers implanted s.c. or i.p. in A/BiF/F50+, DBA/2J and C57BL/6J mice. Chambers with 0.45-micrometer pores implanted s.c. were most densely covered by a syncytium of macrophages and had the most consistently active tumorilysin, compared with smaller-pored
Enzymes of creatine biosynthesis, arginine and methionine metabolism in normal and malignant cells.
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The creatine/creatine kinase system decreases drastically in sarcoma. In the present study, an investigation of catalytic activities, western blot and mRNA expression unambiguously demonstrates the prominent expression of the creatine-synthesizing enzymes l-arginine:glycine amidinotransferase and
Newly available antibodies with practical applications in surgical pathology.
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Selected antibodies that have become available in recent years and have applications in diagnostic pathology are discussed. They include antibodies that are organ-related, provide information on cellular differentiation or histogenetic type, have predictive value in tumors, and highlight infective
Microenvironmental arginine depletion by macrophages in vivo.
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Since the tumour-selective cytotoxic activity of activated macrophages in vitro can be attributed to depletion of the culture medium of L-arginine by macrophage arginase, a series of experiments was designed to determine whether such a mechanism could operate in vivo. Extracellular fluid obtained
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
Apoptosis-inducing high (.)NO concentrations are not sustained either in nascent or in developed cancers.
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Nitric oxide ((.)NO) induces apoptosis at high concentrations by S-nitrosating proteins such as glyceraldehyde-3-phosphate dehydrogenase. This literature analysis revealed that failure to sustain high (.)NO concentrations is common to all cancers. In cervical, gastric, colorectal, breast, and lung
Promotion of fibrosarcoma cell growth by products of syngeneic host macrophages.
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Cells from a C57BL/cbi chemically induced fibrosarcoma (FS6) require exogenous platelet-derived growth factor (PDGF) for in vitro proliferation (as do normal "untransformed" fibroblasts) whereas cells obtained from the FS6M1 tumour, a spontaneous metastasizing subline, show autonomy from PDGF in
Murine gammaherpesvirus-induced fibrosis is associated with the development of alternatively activated macrophages.
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Murine gammaherpesvirus 68 (MHV-68) is a natural pathogen of rodents closely related to the human gammaherpesviruses Kaposi's sarcoma-associated herpesvirus and EBV. Following intranasal infection, the virus replicates in the lung epithelium prior to establishing latent infection in lymphoid tissue.
Potent growth inhibition of human tumor cells in culture by arginine deiminase purified from a culture medium of a Mycoplasma-infected cell line.
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Two kinds of growth-inhibitory substances were found in culture of a Rous sarcoma virus-transformed rat liver cell line, RSV-BRL. The two substances were purified from the serum-free culture medium and identified as transforming growth factor beta 1 and Mycoplasma-derived arginine deiminase (EC
Targeting arginine-dependent cancers with arginine-degrading enzymes: opportunities and challenges.
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Arginine deprivation is a novel antimetabolite strategy for the treatment of arginine-dependent cancers that exploits differential expression and regulation of key urea cycle enzymes. Several studies have focused on inactivation of argininosuccinate synthetase 1 (ASS1) in a range of malignancies,
Mapping the immunosuppressive environment in uterine tumors: implications for immunotherapy.
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The major hurdle for cancer vaccines to be effective is posed by tumor immune evasion. Several common immune mechanisms and mediators are exploited by tumors to avoid immune destruction. In an attempt to shed more light on the immunosuppressive environment in uterine tumors, we analyzed the presence
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