carcinosarcoma/prolinas

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The preparation of carbon-11 labelled proline for positron emission tomography. Preliminary distribution studies in rats with Walker 256 carcinosarcoma.

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DL-[1-11C]Proline has been synthesized by carboxylation of alpha-lithiopyrrolidyl-N-tert-butyl-formamidine with a radiochemical yield of up to 18% without correction for decay. The total synthesis time is 45 min. Accumulation of DL-[1-11C]proline has been shown in Walker 256 carcinosarcoma

Walker 256 tumor cell degradation of extracellular matrices involves a latent gelatinase activated by reactive oxygen species.

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The invasion of blood vessel walls is a critical step in cancer metastasis, in which endothelial cells and their vascular basement membranes act as barriers to tumor cell passage. Here we report that Walker 256 carcinosarcoma (W256) cells degrade subendothelial matrices by a process involving both

Comparative effects of tumour necrosis factor-alpha (cachectin), interleukin-1-beta and tumour growth on amino acid metabolism in the rat in vivo. Absorption and tissue uptake of alpha-amino[1-14C]isobutyrate.

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The effects of acute administration of either tumour necrosis factor-alpha (cachectin) (TNF) or interleukin-1-beta (IL-1), or of tumour growth (Walker-256 carcinosarcoma), on blood amino acid concentrations and tissue alpha-amino[1-14C]isobutyrate (AIB) uptake in virgin and lactating rats were

Antineoplastic agents. 2. Structure-activity studies on N-protected vinyl, 1,2-dibromoethyl, and cyanomethyl esters of several amino acids.

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Previously reported work on N-protected activated esters of phenylalanine has been extended to include N-protected vinyl, dibromoethyl, and cyanomethyl esters of several other amino acids. These compounds have been synthesized and evaluated in Ehrlich ascites carcinoma, Walker 256 carcinosarcoma,

Basement membrane biosynthesis as a target for developing inhibitors of angiogenesis with anti-tumor properties.

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Basement membrane (BM) exerts profound influence on endothelial cell (EC) behavior. In addition BM is a structural element of blood vessels; in fact at some point of their formation blood vessels are bare EC tubes lined with the BM produced by these EC. We thought, therefore, that a quantitative

The effects of tumour necrosis factor-alpha (cachectin) and tumour growth on hepatic amino acid utilization in the rat.

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The effects of acute administration of tumour necrosis factor-alpha (cachectin) (TNF-alpha) or of malignant tumour growth (Walker-256 carcinosarcoma) on hepatic availability and uptake of individual amino acids were compared. The results show that, in spite of lowering the hepatic availability of

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