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l threonine/leucémie
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Characterization of L-threonine and L-glutamine transport in murine P388 leukemia cells in vitro. Presence of an N-like amino acid transport system.
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The transport of L-threonine and L-glutamine into murine P388 leukemia cells has been characterized. Threonine appears to be a specific substrate for a Na+-dependent amino acid transport system similar to system ASC of the HTC hepatoma cell. Threonine transport is uninhibited by
L-Threonine deaminase as a possible antitumor agent.
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In vitro studies with L-threonine deaminase purified from sheep liver demonstrated that the enzyme was cytotoxic toward two lines of murine leukemia cells but not toward L cells or normal human fibroblasts. When L-threonine deaminase was injected into mice, it was possible to lower the plasma
Further studies on amino acid transport in murine P388 leukemia cells in vitro. Presence of system y+.
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The transport of glycine and L-lysine into murine P388 leukemia cells has been examined. Glycine transport appears to be shared by both systems A and ASC in P388 cells. Glycine transport is Na+-dependent and is effectively blocked by alpha-(methylamino)isobutyric acid, threonine and alanine but only
A novel cytotoxic ternary copper(II) complex of 1,10-phenanthroline and L-threonine with DNA nuclease activity.
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A novel ternary copper(II) complex, [Cu(phen)(L-Thr)(H2O)](ClO4) (phen=1,10-phenanthroline, L-Thr=L-threonine), has been synthesized and structurally characterized. The complex crystallized in a triclinic system with space group P1 , a=7.526(15) A, b=11.651(2) A, c=12.127(2) A, alpha=115.41(3)
Synthesis and biological activities of some N4-substituted 4-aminopyrazolo(3,4-d)pyrimidines.
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Syntheses and biological activities of 26 N4-substituted 4-aminopyrazolo[3,4-d]pyrimidines as analogs of naturally occurring modified nucleic acid bases, N-(purin-6-ylcarbamoyl)-L-threonine and N6-(delta2-isopentenyl)adenine, are described. 4-Aminopyrazolo[3,4-d]pyrimidine was converted into the
Synthesis and antitumor activities of glycine-exchanged analogs of spicamycin.
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A series of SPM VIII analogs were synthesized to investigate the effect of the amino acid moiety on the antitumor activity. The L-threonine analog and the glycylglycine analog of SPM VIII showed much higher cytotoxicity to P388 murine leukemia cells (IC50 5.8 nM and 0.11 nM, respectively) than SPM
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