Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0023418 (leukemia)
 93,477 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Following a wet digestion of 0.5-2.0 ml cerebrospinal fluid in an open system using 2.0 ml nitric acid and 1.0 ml perchloric acid (240 degrees C) and a reduction step with 1.0 ml hydrochloric acid, Selenium can be determined polarographically after adding 100 micrograms Copper(II)-ions to the analyte (15 ml; water/perchloric acid). Selenium concentrations in cerebrospinal fluid of children younger than one year (2.49 +/- 1.67 ng/ml) are significantly higher (p = 0.0074) than those of older children (1.28 +/- 0.97 ng/ml). Independent of the children age and diseases the Selenium concentrations correlate distinctly with cell numbers and protein contents. A correlation between Selenium content and cell numbers alone could not be proved. The nonsignificant differences between the Selenium concentrations in cerebrospinal fluids of children with hydrocephalus, leukemia (with or without involvement of the central nervous system), and other diseases, respectively, may be interpreted by considering the protein content of the cerebrospinal fluid and the age of the children.
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PMID:[Selenium concentration in the cerebrospinal fluid of children]. 361 44

Bis(diphenylphosphine)ethane (DPPE) and its bis[chlorogold(I)] [DPPE(Au2Cl2)], and bis[trichlorogold(III)] [DPPE(Au2Cl6)], complexes have in vivo antitumor activity. To determine if interaction with metals in situ can play a role in the antitumor activity of DPPE, we have studied the effects of DPPE, DPPE(Au2Cl2), DPPE(Au2Cl6) and mixtures of DPPE with metal salts on in vitro and in vivo biological systems. The in vitro cytotoxic potencies of the two DPPE-gold complexes were approximately 10-fold greater than that of DPPE. In addition, the cytotoxic potency of DPPE was increased when incubated with cells in the presence of Au(III) and Cu(II) salts, whereas Mg(II), Zn(II), Mn(II), Fe(II), Co(II), and Cd(II) had no effect. The effects of DPPE, DPPE(Au2Cl2) and mixtures of DPPE and metal salts on the activity of a model enzyme system, DNA polymerase alpha were measured. While DPPE did not inhibit the activity of DNA polymerase alpha, the DPPE(Au2Cl2) complex and mixtures of DPPE and Cu(II) salts inhibited the activity of the enzyme. Consistent with the effects observed in vitro, coadministration of Cu(II) or Au(III) increased the in vivo potency of DPPE in mice bearing i.p. P388 leukemia. Fifteen other DPPE analogues were evaluated for in vivo antitumor activity and for the effect of Cu(II) on their in vitro cytotoxic potency; there was a relationship between the ability of Cu(II) to potentiate the cytotoxic activities of DPPE analogues and their having in vivo antitumor activity.
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PMID:Modulation of the antitumor and biochemical properties of bis(diphenylphosphine)ethane with metals. 375 63

We have previously reported the cytotoxicity and antitumor activity of bis(diphenylphosphino)ethane (DPPE) and a variety of its transition metal complexes. During studies of the chemistry of a gold complex of this group [(AuCl)2(DPPE)], it was observed that this complex readily underwent ring closure on reaction with DPPE to form the tetrahedral complex [Au(DPPE)2]+. Various counterion forms (e.g., Cl-) of this cation were isolated and were found to exhibit a remarkably high stability in solution. Evaluation of [Au(DPPE)2]Cl in mice bearing i.p. P388 leukemia demonstrated that the compound produced an average of 87% increase in life span at its maximally tolerated dose (2-3 mumol/kg/day for 5 days). Activity was also seen in i.p. M5076 reticulum cell sarcoma (60% increase in life span) and s.c. mammary adenocarcinoma 16/c. Modest activity was evident in i.p. B16 melanoma and L1210 leukemia. A subline of P388 leukemia resistant to cisplatin was not cross-resistant to [Au(DPPE)2]Cl. In addition, combination therapy of [Au(DPPE)2]Cl and cisplatin against i.p. P388 demonstrated an advantage over single-agent therapy. In vitro studies of [Au(DPPE)2]Cl showed that the compound: is cytotoxic to tumor cell lines; is only minimally inhibited in its cytotoxic activity by the presence of serum; produces DNA protein cross-links and DNA strand breaks in cells; and inhibits macromolecular synthesis with a preferential inhibitory effect on protein synthesis relative to DNA and RNA synthesis. 31P nuclear magnetic resonance spectroscopy indicated that the compound is stable in the presence of serum proteins, thiols, or disulfides and that it reacts with Cu(II) resulting in the formation of a Cu(I)DPPE complex. The results of these in vivo and in vitro experiments suggest that the contrasting pharmacological profile of [Au(DPPE)2]Cl with respect to other gold(I) phosphine complexes may be related to both the kinetic stability of the complex and its stability in the presence of thiols.
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PMID:In vivo antitumor activity and in vitro cytotoxic properties of bis[1,2-bis(diphenylphosphino)ethane]gold(I) chloride. 375 97

trans-Bis(salicylaldoximato)copper(II) (CuSAO2), the parent compound of a new group of antiproliferative copper(II) complexes, was studied in vivo. It had marked antitumor activity against Ehrlich ascites carcinoma in NMRI mice. Survival was considerably increased, and, in some cases, total cures were encountered. No activity against leukemia L1210 was found in female DBA/2J mice, although CuSAO2 is equally effective against L1210 and Ehrlich carcinoma cells in vitro. The side effects of CuSAO2 included weight loss, weakness, acrodynia, and blindness; all of these side effects were transient.
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PMID:Antitumor activity of trans-bis(salicylaldoximato)copper(II): a novel antiproliferative metal complex. 402 35

RNA tumor viruses contain a characteristic RNA-dependent DNA polymerase (reverse transcriptase) which has been thought to be related to the induction of leukemia by this virus. A disturbance in a zinc-dependent enzyme system was first postulated to account for the demonstrated differences in zinc metabolism of normal and leukemic leukocytes [Vallee et al. in (1949) Acta Unio. Int. Contra Cancrum 6, 869 and (1950) Acta Unio. Int. Contra Cancrum 6, 1102]. In order to investigate the relationship between zinc and the initiation of leukemia in chickens by avian myeloblastosis virus, we have examined the metalloenzyme nature of its reverse transcriptase. The present data show that this protein is a zinc metalloenzyme demonstrating the postulated relationship between zinc and a leukemic process. Paucity of purified enzyme generated the design of a novel system of analysis incorporating microwave-induced emission spectrometry combined with gel exclusion chromatography. It provides precision, reproducibility, and remarkable limits of detection on mul samples containing 10(-12) to 10(-14) g-atoms of metal, and is thus orders of magnitude more sensitive than other methods. The chromatographic fraction with highest enzymatic activity contains 1.8 x 10(-11) g-atoms of zinc per 1.6 mug of protein, corresponding to either 1.8 or 2.0 g-atoms of zinc per mole of enzyme for a molecular weight previously determined either as 1.6 or 1.8 x 10(5). Copper, iron and manganese are absent, i.e., at or below the limits of detection, 10(-13) to 10(-14) g-atoms. Agents known to chelate zinc inhibit the enzyme, while their nonchelating isomers do not. The data underline the participation of zinc in nucleic acid metabolism and bear importantly upon the lesions that accompany leukemia and zinc deficiency.
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PMID:RNA-dependent DNA polymerase (reverse transcriptase) from avian myeloblastosis virus: a zinc metalloenzyme. 413 17

Serum copper levels of 132 controls and 122 cancer patients (including Hodgkin's disease, lung cancer, breast cancer, leukemia, untreated patients, and patients in progression) were measured using both atomic absorption (AA) and electron paramagnetic resonance (EPR) techniques. The data pairs were compared using linear regression analysis, EPR versus AA, and all the data (controls and cancers) fit a single regression line with a squared correlation coefficient (r2) of 0.80. Comparison of the subpopulations revealed possible small differences, but none great enough to be of diagnostic value for individual patients. Thus, in a number of cases of practical interest, EPR-determined serum copper levels were essentially redundant with respect to AA measurements. Previous reports recommending the use and possible superiority of EPR for serum copper determinations appear not to have compared the EPR and AA techniques adequately or correctly. EPR serum copper measurements may yet provide unique data in these diseases, but a more detailed analysis of the spectral parameters will be required. EPR-determined serum transferrin levels are also reported.
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PMID:Comparison of electron paramagnetic resonance and atomic absorption serum copper measurements in human normal control and cancer patients. 630 84

Inbred C58 mice, kept on a copper-deficient (-Cu) diet from birth, were tested for their ability to be immunized to, and subsequently challenged with, line Ib syngeneic transplantable malignant lymphocytes (Ib cells). -Cu mice had significantly lowered hematocrits and serum ceruloplasmin (EC 1.16.3.1) values in contrast to those of the copper-supplemented (+Cu) controls. All male +Cu mice (17/17) survived the immunization regimen (consisting of approximately 10(3) viable and 10(7) inactivated Ib cells) and the challenge dose (10(6) viable Ib cells). Male -Cu mice had a survival rate of only 15% (4/27) after the immunization process and an overall survival rate of 11% (3/27). Female +Cu mice had survival rates of 86% (19/22) after immunization and of 74% (14/19) after the challenge dose, compared to 54% (15/28) and 47% (7/15) survival rates, respectively, for the female -Cu mice. Overall, the +Cu mice had a 79% (31/39) survival of both immunization and challenge compared to an 18% (10/55) survival for the -Cu mice. These results indicate that the initiation and maintenance of cell-mediated immunity to leukemia cells are severely impaired in -Cu animals.
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PMID:Immunization against transplantable leukemia impaired in copper-deficient mice. 695 48

The levels of copper, zinc, calcium, manganese and magnesium have been monitored in the sera of patients suffering from various types of cancer. Only serum copper appeared to be of any diagnostic significance, its levels being above the normal reported range in the breast cancer, leukaemia and Hodgkin's lymphoma patients. In the case of breast cancer, serum copper is progressively elevated according to the stage of the disease. Serum calcium levels were also significantly lower in patients with tumours of the breast, gastrointestinal tract and cervix. The results suggest that serum copper levels could be of prognostic significance in breast cancer patients receiving radiotherapy.
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PMID:The serum levels of some trace and bulk elements in cancer patients. 705 45

6-Ethynyluracil (3) was prepared by two different synthetic procedures. In one approach, 6-formyluracil was reacted with (dibromomethylene)triphenylphosphorane to give 6-(2,2-dibromovinyl)uracil (2), which was silylated and treated with phenyllithium to yield 3. Alternatively, silylated 6-iodouracil was reacted with trimethylsilylacetylene in dry triethylamine in the presence of a palladium/copper catalyst to give 6-[(trimethylsilyl)ethynyl]uracil (5). Compound 5 was converted to 3 in refluxing methanol. At neutral pH, 3 reacted with thiols, such as glutathione, 2-mercaptoethanol, and L-cysteine, but did not react with glycine or L-lysine. This reaction was accompanied by a shift in the UV maximum of 3 from 286 nm to 321-325 nm. The reaction of 3 with 2-mercaptoethanol gave cis-6-[2[(2-hydroxyethyl)-thio]vinyl]uracil as the predominant product. Compounds 2 and 3 inhibited the growth of leukemia L1210, B-16 melanoma, and lewis lung carcinoma cells at concentrations ranging from 1 x 10(-6) to 2 x 10(-5) M. As determined with L1210 cells, the inhibition of growth caused by 2 and 3 was not prevented by the natural pyrimidines, indicating that the agents do not act as antimetabolites.
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PMID:Synthesis and biological evaluation of 6-ethynyluracil, a thiol-specific alkylating pyrimidine. 714 68

The oxidative modification of low-density lipoprotein by macrophages may be an important mechanism in the pathogenesis of atherosclerosis. The human monocytic leukaemia cell line THP-1, when stimulated with phorbol ester, shares many properties with human monocyte-derived macrophages. Oxidation of LDL by these cells was characterised by depletion of alpha-tocopherol, increases in thiobarbituric acid reactive substances and increases in electrophoretic mobility. The LDL particles were also converted to a form which increased accumulation of cholesteryl esters within macrophages. The oxidative mechanism appeared to be dependent upon the presence of thiols in the cellular medium. Oxidation of LDL by THP-1 macrophages, and production of thiols by these cells, were dependent upon the presence of L-cystine in the medium. Furthermore, cellular oxidation of LDL could be partially mimicked by the addition of cysteine to Hams F10 medium. Macrophage-independent oxidation of LDL, mediated by the addition of copper ions, was inhibited by cystine and cysteine in phosphate buffered saline, but not in Hams F10 medium. The glutathione content of THP-1 macrophages was also dependent upon the presence of cysteine or cystine in the medium, but inhibition of glutathione synthesis by buthionine sulfoximine did not prevent the production of thiols or the oxidation of LDL by THP-1 macrophages.
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PMID:Human (THP-1) macrophages oxidize LDL by a thiol-dependent mechanism. 888 36


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