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)

The effects of vitamin K3, quinones, fat-soluble vitamins, and various naturally occurring and synthetic compounds on the binding of 125I-epidermal growth factor (EGF) to mink lung cells or murine 3T3 cells in culture were studied. Vitamin K3, but not other fat-soluble vitamins, markeldy inhibits the binding of 125I-labeled EGF to treated cells, but does not affect the binding of insulin, concanavalin A, alpha-2-macroglobulin, and murine leukemia virus glycoprotein, gp70, to their membrane receptors. The binding of multiplication stimulating activity to treated cells is also reduced to some extent. Vitamin K3 alters the affinity of the receptors for EGF without changing the total number of available receptors per cell. Vitamin K3 modulation of EGF-receptor interaction is a temperature- and time-dependent phenomenon. EGF-receptor interaction is also significantly modulated by 1,4-naphthoquinone, 1,4-benzoquinone, and phenanthrenequinone but not by other quinones of anthracyclic antibiotics.
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PMID:Vitamin K3 (menadione) and related quinones, like tumor-promoting phorbol esters, alter the affinity of epidermal growth factor for its membrane receptors. 625 Oct 65

GH, LH, insulin and glucagon patterns were studied in the peripheral leukocytes of normal subjects (granulocytes and lymphocytes separated on a Ficoll-Hypaque gradient) and leukaemic patients (CML, AML, CLL, and ALL), using a double antibody RIA on whole cells. The uptake of 125I-labelled insulin and GH by these cells was also assessed. The results showed that in leukaemia, particularly CLL, ALL and AML, though not in CML, there was a constant reduction in hormone values, plus depressed GH and insulin uptake. The only exceptions were glucagon and insulin in CML, and LH in CLL, since their concentrations were normal or clearly enhanced. The data are seen as an expression of a membrane receptor block extending to several hormones with structural differences (protein, steroid, T3 and T4), capable of altering the ability of leukaemic cells to respond to ordinary factors modulating their differentiation, functional activity, and the expansion of the corresponding stem cell compartment.
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PMID:[Behavior of the principal protein hormones in normal and leukemic leukocytes]. 630 18

DNA sequencing and blot hybridization analyses have been used to study the structure of a mouse VL30 gene and the molecular nature of VL30-related RNA which is induced upon the stimulation of cultured AKR mouse embryo cells with defined peptide growth factors. An integrated mouse VL30 gene was found to contain identical 601-base-pair long terminal repeats (LTRs) which were themselves terminated in short inverted repeats. The entire VL30 gene was flanked by a 4-base-pair direct repeat of cellular DNA. Thus, VL30 genes are structurally analogous to integrated forms of retrovirus proviruses and certain other classes of mobile genetic elements. The LTR sequence was found to contain putative promoter and polyadenylation signals and generally exhibited little sequence homology to murine leukemia virus proviral LTRs. Certain short regions of sequence conservation, however, were evident, including the inverted terminal repeat, LTR-adjacent regions corresponding to origins of murine leukemia virus proviral DNA synthesis, and a 36-base-pair direct repeat bearing homology to the 72-base-pair direct repeat (enhancer sequence) of the murine leukemia virus-related Moloney sarcoma virus. Upon mitogenic stimulation of quiescent cells with epidermal growth factor and insulin, a major 5.5-kilobase VL30-specific RNA complementary to both LTR and non-LTR sequences was rapidly induced. We conclude that a complete VL30 gene(s) is highly regulated by peptide growth factor binding to specific membrane receptors in these cells.
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PMID:Structure and expression of mouse VL30 genes. 631 90

A radioresistant in vivo tumor consisting of a partially hypoxic P388 murine leukemia growing intraperitoneally (IP) in B6D2F1 female mice was used to test the radioenhancement potential of 5-Thio-D-Glucose (5TDG) and insulin. Pretreated animals were exposed to increasing doses of whole body radiation (5, 10, 20 Gy) and harvested tumor cells were re-injected into new hosts. In this experiment little benefit was demonstrated with 5TDG or the combination of 5TDG and insulin + radiation. The median survival of animals receiving cells pre-treated with insulin and radiation was improved, but, in general, did not reach statistical significance by the log rank method.
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PMID:The radioenhancement effects of 5-thio-D-glucose and insulin in vivo on a hypoxic P388 murine leukemia. 634 13

Tumor cells obtained from leukemia and lymphoma patients were investigated for specific insulin receptors. Using radioactive 125I-labeled insulin, specific insulin binding sites were demonstrated on most acute lymphocytic leukemia (ALL) and acute myelocytic leukemia (AML) cells, including acute promyelocytic leukemia (APL), chronic myelocytic leukemia (CML), and acute monocytic leukemia (AMoL) cells. Insulin receptors were not found on chronic lymphocytic leukemia (CLL) and malignant lymphoma (ML) cells. Specific insulin binding sites were also found on monocytes and thymocytes after treatment with phytohemagglutinin (PHA-P), but not on inactivated tonsil cells, peripheral blood lymphocytes, or thymocytes. There was no inverse correlation between the content of insulin receptors and the basal level of circulating insulin. These data suggest that the insulin receptor may be a new marker of acute leukemia and chronic myelocytic leukemia.
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PMID:Insulin receptors on leukemia and lymphoma cells. 634 73

The binding and internalization of fluorescein isothiocyanate-conjugated insulin by nonactivated and phytohemagglutinin-activated circulating human lymphocytes was measured by flow cytometry. In confirmation of previous results, negligible binding or internalization was observed for unstimulated cells, while activated lymphocytes showed significant insulin binding. The majority of this insulin was demonstrated to be internalized via receptor-mediated endocytosis and acidified within 60 min after addition of insulin. Dual-fluorescence flow cytometry, using antibodies specific for human T cell subsets, was used to show that the expression of insulin binding sites occurs for at least some cells from both the helper/inducer and cytotoxic/suppressor T cell subsets. Insulin internalization is not an artifact of in vitro stimulation, since more than 90% of the unstimulated lymphocytes from a patient with a helper T cell leukemia are positive for insulin internalization. The usefulness of flow cytometric analysis for measuring lymphocyte activation in unstimulated populations and the therapeutic potential of the reported findings for control of lymphocyte proliferation are discussed.
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PMID:Internalization and acidification of insulin by activated human lymphocytes. 638 31

The influence of three chosen model sulfhydryl groups containing compounds, characterized by increasing size of molecule--cysteine, glutathione and insulin on antineoplastic activity of 5-fluorouracil (5-FU) and 6-mercaptopurine (6-MP) against murine leukemia L-1210 5-FU and 6-MP and murine sarcoma Sa 180, was studied. Sulfhydryl compounds failed to change in most cases the therapeutic (antineoplastic) effect of 5-FU and 6-MP. However, certain doses of these sulfhydryl compounds enhanced the cytostatic effect of 6-MP in respect to Sa-180.
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PMID:Influence of some sulfhydryl compounds on the antineoplastic effectiveness of 5-fluorouracil and 6-mercaptopurine. 639 26

Oral glucose tolerance tests were performed in 47 children with acute lymphoblastic leukemia (ALL), treated according to 2 consecutive protocols. Glucose and insulin values were assessed before and after L-asparaginase (L-asp). 30 children (group A) received L-asp as a single-agent consolidation course, after achieving remission with vincristine (VCR) and prednisone (PDN). Normal insulin and glucose levels were found in all patients before L-asp; 4 children (13%) had a transient impaired glucose tolerance (IGT) after completing L-asp therapy. 17 children (group B) were given L-asp during induction therapy with VCR and PDN, and all achieved complete remission. 5 patients (23%) had IGT, without hypoinsulinemia, before L-asp administration. IGT normalized in 4 patients after L-asp, the other children developed a diabetes mellitus. Only 1 patient, with a normal IGT test before L-asp therapy, showed a transient IGT after L-asp. In patients with ALL, the presence of IGT before treatment may be related to leukemia. The concomitant use of steroids does not influence the incidence of IGT in our series. Our data reveal normal insulinemia in patients with IGT. Thus, the leukemic process itself may play a much more significant role in inducing abnormalities in carbohydrate metabolism.
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PMID:Glucose metabolism in children with acute lymphoblastic leukemia treated according to two different L-asparaginase schedules. 644 22

To examine whether a human erythroleukemia cell line, K-562, can proliferate and differentiate without protein supplements, long-term cultivation of the cells was carried out in a protein-free chemically defined medium. By the use of stepwise decreases in the fetal bovine serum concentration, continuous growth of K-562 cells was established in a protein-free F-10 medium. The cells have been propagated in this medium for 3 years. The population-doubling time of the cells is about 30 hr. Growth was not stimulated by the addition of insulin, epidermal growth factor, fibroblast growth factor, multiplication-stimulating activity, transferrin, platelet-derived growth factor, or dexamethasone. Addition of serum stimulated the cell growth slightly and increased the saturation density. The saturation density of the cells could be increased to that seen with serum-supplemented cultures by changing the serum-free medium daily. The cells synthesized significant amounts of hemoglobin in the presence of hemin without serum supplementation. The results suggest that the human erythroleukemia cells grown in a protein-free medium do not require serum components for their growth or hemin-induced hemoglobin synthesis and provide an excellent model for better understanding of the growth and differentiation of human leukemia cells.
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PMID:Long-term cultivation and differentiation of human erythroleukemia cells in a protein-free chemically defined medium. 658 2

Medium conditioned by mezerein-treated human acute monocytic leukemia cells (THP-1) stimulated human fibroblast replication. Maximum mitogenic activity was elaborated by THP-1 cells with a 24-hr incubation in 10(-7) M mezerein (activator phase) followed by a 36-hr incubation in insulin-supplemented serum-free Roswell Park Memorial Institute (RPMI)-1640 medium (effector phase). Growth stimulation was not due to the presence of residual mezerein. We previously reported that leukemia cells also produced a growth inhibitor. Fibroblast stimulation was resolved by isoelectrofocusing into several active fractions separate from the growth inhibitory activity for malignant mammary cells. Conditioned medium was mitogenic for fibroblasts in the presence of high concentrations of fetal bovine and human whole blood sera. Growth stimulation was observed in plasma-derived serum only when supplemented with exogenous platelet-derived growth factor. Thus, this THP-1 cell product does not fulfill the role of a competence factor.
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PMID:Stimulation of diploid fibroblast growth with serum-free medium conditioned by mezerein-treated monocytic leukemia cells. 658 49


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