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

Ornithine decarboxylase (ODC), a tumor promoter, provokes cell proliferation, and inhibits cell death; but the mechanism involved in cell differentiation remains unknown. Herein, we examine whether it functions during macrophage-like differentiation. Previous studies reveal that ODC, a rate-limiting enzyme of polyamine biosynthesis, and polyamines are involved in restraining immune response in activated macrophage. By using 12-O-tetradecanoylphorbol-13-acetate (TPA)-differentiated human promyelocytic HL-60 and promonocytic U-937 cells, we discover that polyamines block the expression, secretion and activation of MMP-9. Meanwhile conventional expression of ODC represses tumor necrosis factor-alpha (TNF-alpha) expression and nuclear factor-kappaB (NF-kappaB) activation as well as MMP-9 enzyme activity. Following stimulation by TNF-alpha, the secretion of MMP-9 is restored in ODC-overexpressed cells. In addition, the NF-kappaB inhibitors (pyrrolidinedithiocarbamate, BAY-11-7082 and lactacystin) suppress the TPA-induced MMP-9 enzyme activity. Concurrently, both the irreversible inhibitor of ODC, alpha-difluoromethylornithine, and TNF-alpha could not recover MMP-9 activation following NF-kappaB inhibitor treatment in parental cells. Furthermore, ODC could directly inhibit and attenuate NF-kappaB DNA binding and transcriptional activation. Therefore, we suggest that ODC inhibits the TNF-alpha-elevated MMP-9 activation via NF-kappaB as TPA-induced macrophage-like differentiation and this interrupting mechanism may provide a new conceivable resolution why leukemia is poorly differentiated besides atypical growth.
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PMID:Ornithine decarboxylase interferes with macrophage-like differentiation and matrix metalloproteinase-9 expression by tumor necrosis factor alpha via NF-kappaB. 1817 35

The metalloprotease 9 (MMP-9), a known mediator of tumour invasion, is secreted as a 92 kDa pro-form but a non-secreted variant of 85 Kda has been described. The importance of this variant pro-form in tumor progression remains poorly defined. We previously showed that the DNA repair protein Ku interacts at the cell surface of leukaemia cell lines with the 85 Kda pro-form of MMP-9 and these Ku/MMP-9 complexes regulates cell invasion, highlighting their importance in haematological malignancies. We demonstrate here that all samples of acute myeloid leukaemia (AML) blasts purified from bone marrow of 16 affected patients express the 85 Kda form of MMP-9. However, only AML that display monocytic lineage markers (AML4/5) express this form at the cell surface with co-expression of the membrane associated form of Ku. Blocking antibodies directed against Ku or MMP-9 specifically inhibited cell invasion of those expressing Ku/MMP-9 on the cell surface. The membrane form of Ku might represent an important factor in the exposition to the cell surface of this specific MMP-9 pro-form in AML with monocytic features. These results might have important functional significance in the occurrence of extra-medullar infiltrates of leukaemia cells that occurs frequently during the onset of monocyte-related AML sub-types.
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PMID:Cell-surface MMP-9 regulates the invasive capacity of leukemia blast cells with monocytic features. 1841 48

This study was purpose to investigate the effects of CD147 on the invasiveness of leukemia cells U937. The experiments were divided into 4 groups: control group, LPS group, CD147mAb group and LPS+CD147 mAb group. Cells were treated by lipopolysaccharide (LPS) or anti-CD147 monoclonal antibody, and the expression of CD147 and MMP-2, -9, the invasive potential of the cells in vitro and ex vivo, as well as the invasion of the implanted tumors in SCID mice were analysed by RT-PCR, FCM, gel zymography and invasion test in vitro respectively. The results showed that the expression of CD147 was elevated by the induction of LPS, and the enhanced expression of CD147 on U937 cells increased the production and secretion of MMP-2 and MMP-9 as measured by reverse transcription-PCR and gel zymography. An increased number of LPS-induced cells invading through a reconstituted basement membrane were observed by invasion assays. These responses were down-regulated after blocking CD147 with anti-CD147 antibody. At 30 days after intravenous injection of LPS pretreated U937 cells to SCID mice human U937 cells were found in the bone marrow and lung of the mice, indicating the invasion of the tumor cells. And overexpressions of CD147, MMP-2 and MMP-9 were found in the lung tissue of the mice injected with LPS-treated but not anti-CD147 antibody treated tumor cells. It is concluded that overexpression of CD147 on U937 cells may increase the secretion and activation of MMP-2 and MMP-9 and thus promote the invasiveness of the tumor cells.
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PMID:[CD147 increases invasiveness of U937 cells through regulation of matrix metalloproteinase activity]. 1842 42

Cancer is primarily a disease of old age, and that life style plays a major role in the development of most cancers is now well recognized. While plant-based formulations have been used to treat cancer for centuries, current treatments usually involve poisonous mustard gas, chemotherapy, radiation, and targeted therapies. While traditional plant-derived medicines are safe, what are the active principles in them and how do they mediate their effects against cancer is perhaps best illustrated by curcumin, a derivative of turmeric used for centuries to treat a wide variety of inflammatory conditions. Curcumin is a diferuloylmethane derived from the Indian spice, turmeric (popularly called "curry powder") that has been shown to interfere with multiple cell signaling pathways, including cell cycle (cyclin D1 and cyclin E), apoptosis (activation of caspases and down-regulation of antiapoptotic gene products), proliferation (HER-2, EGFR, and AP-1), survival (PI3K/AKT pathway), invasion (MMP-9 and adhesion molecules), angiogenesis (VEGF), metastasis (CXCR-4) and inflammation (NF-kappaB, TNF, IL-6, IL-1, COX-2, and 5-LOX). The activity of curcumin reported against leukemia and lymphoma, gastrointestinal cancers, genitourinary cancers, breast cancer, ovarian cancer, head and neck squamous cell carcinoma, lung cancer, melanoma, neurological cancers, and sarcoma reflects its ability to affect multiple targets. Thus an "old-age" disease such as cancer requires an "age-old" treatment.
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PMID:Curcumin and cancer: an "old-age" disease with an "age-old" solution. 1846 66

Our previous study has revealed that astilbin, a flavonoid isolated from the rhizome of Smilax glabra, improves an immunological liver injury and its mechanism includes an inhibition of the lymphocyte adhesion. The present study further examined the anti-adhesive activity in various assays by using human leukemia T cell line Jurkat cells. We found that astilbin inhibited the adhesion of Con A or PMA-activated Jurkat cells to fibronectin, type IV collagen, hyaluronic acid, and [corrected] ECV-304 cells. Astilbin inhibited the adhesion of Jurkat cells to PMA-activated but not non-activated ECV-304 cells without any influence on the survival of the ECV-304 cells and Jurkat cells. Astilbin also inhibited the CD44 expression and TNF-alpha production in Jurkat cells. In the co-culture assay between Jurkat cells and ECV-304 cells, the MMP-9 secretion from Jurkat cells was inhibited after astilbin-treatment, while the exogenous TNF-alpha increased the MMP-9 secretion in a dose-dependent manner. These findings suggest that the inhibition of T lymphocyte adhesion by astilbin may be related to the reduction of the CD44 expression and TNF-alpha production in the cells, which may further cause a decreased MMP-9 secretion.
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PMID:Astilbin inhibits the adhesion of T lymphocytes via decreasing TNF-alpha and its associated MMP-9 activity and CD44 expression. 1901 46

Sulforaphane (SFN) is a biologically active compound extracted from cruciferous vegetables, and possessing potent anti-cancer and anti-inflammatory activities. Here, we show that tumor necrosis factor-alpha (TNF-alpha), in combination with a sub-toxic dose of SFN, significantly triggered apoptosis in TNF-alpha-resistant leukemia cells (THP-1, HL60, U937, and K562), which was associated with caspase activity and poly (ADP-ribose)-polymerase cleavage. We also report that SFN non-specifically inhibited TNF-alpha-induced NF-kappaB activation through the inhibition of IkappaBalpha phosphorylation, IkappaBalpha degradation, and p65 nuclear translocation. This inhibition correlated with the suppression of NF-kappaB-dependent genes involved in anti-apoptosis (IAP-1, IAP-2, XIAP, Bcl-2, and Bcl-xL), cell proliferation (c-Myc, COX-2, and cyclin D1), and metastasis (VEGF and MMP-9). These effects suggest that SFN inhibits TNF-alpha-induced NF-kappaB activation through the suppression of IkappaBalpha degradation, leading to reduced expression of NF-kappaB-regulated gene products. Combined treatment with SFN and TNF-alpha was also accompanied by the generation of reactive oxygen species (ROS). Pre-treatment with N-acetyl-l-cysteine significantly attenuated the combined treatment-induced ROS generation and caspase-3-dependent apoptosis, implying the involvement of ROS in this type of cell death. In conclusion, the results of the present study indicate that SFN suppresses TNF-alpha-induced NF-kappaB activity and induces apoptosis through activation of ROS-dependent caspase-3.
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PMID:Sulforaphane suppresses TNF-alpha-mediated activation of NF-kappaB and induces apoptosis through activation of reactive oxygen species-dependent caspase-3. 1895 68

A combination of demethylating agents and histone deacetylase inhibitors (HDACi) has been proposed as a novel therapy in leukemia and myelodysplasia. In HL-60 cells azacytidine (AZA) and Metacept-1 (MCT-1), a novel HDACi augmented inhibition of cell growth and increased apoptosis. In identifying a molecular mechanism responsible for these effects MCT-1 alone and in combination with AZA induced p15INK4b, p21WAF1/CIP1 and Caspase-3 whilst attenuating Bcl-XL expression. Interestingly, MCT-1 in combination with AZA significantly induced the recently identified suppressor of leukemogenesis Nur77 and attenuated AZA-induced MMP-9 expression. The combination of MCT-1 and AZA is more effective in inhibiting leukemic cell growth and induction of apoptosis. Regulation of a recently identified tumour suppressor gene together with cell cycle, apoptosis and matrix degrading proteases may underpin the molecular mechanism responsible for these effects.
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PMID:The anti-leukemic effect of a novel histone deacetylase inhibitor MCT-1 and 5-aza-cytidine involves augmentation of Nur77 and inhibition of MMP-9 expression. 1914 94

Glutamate is the major excitatory neurotransmitter of the nervous system. We previously found that glutamate activates normal human T-cells, inducing their adhesion and chemotaxis, via its glutamate receptors of the alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) subtype 3 (GluR3) expressed in these cells. Here, we discovered that human T-leukemia (Jurkat) and cutaneous sezary T-lymphoma (HuT-78) cells also express high levels of GluR3. Furthermore, glutamate (10 nM) elevates CD147/EMMPRIN, a cancer-associated matrix metalloproteinases (MMPs) inducer, promoting spread of many tumors. Glutamate-induced CD147 elevation in both cancerous and normal human T-cells was mimicked by AMPA (glutamate/AMPA-receptor agonist) and blocked by CNQX (glutamate/AMPA-receptor antagonist). Importantly, glutamate also increased gelatinase MMP-9 secretion by T-lymphoma. Finally, ex vivo pre-treatment of T-leukemia with glutamate enhanced their subsequent in vivo engraftment into chick embryo liver and chorioallantoic membrane. Together, these findings reveal that glutamate elevates cancer associated proteins and activity in T-cell cancers and by doing so may facilitate their growth and spread, especially to and within the nervous system. If so, glutamate receptors in T-cell malignancies should be blocked.
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PMID:Human T-leukemia and T-lymphoma express glutamate receptor AMPA GluR3, and the neurotransmitter glutamate elevates the cancer-related matrix-metalloproteinases inducer CD147/EMMPRIN, MMP-9 secretion and engraftment of T-leukemia in vivo. 1939 Oct 40

Acute myelogenous leukemias (AMLs) are characterized by medullary and extramedullary invasion. We hypothesized that a supramolecular complex, the leukemia-cell invadosome, which contains certain integrins, matrix metalloproteinases (MMPs), and other as-yet unidentified proteins, is essential for tissue invasion and may be central to the phenotypic diversity observed in the clinic. Here we show that the specific binding of MMP-9 to leukocyte surface beta(2) integrin is required for pericellular proteolysis and migration of AML-derived cells. An efficient antileukemia effect was obtained by the hexapeptide HFDDDE, a motif of the MMP-9 catalytic domain that mediates integrin binding: HFDDDE prevented proMMP-9 binding, transmigration through a human endothelial cell layer, and extracellular matrix degradation. Notably, the functional protein anchorage between beta(2) integrin and proMMP-9 described in this study does not involve the enzymatic active sites targeted by known MMP inhibitors. Taken together, our results provide a biochemical working definition for the human leukemia invadosome. Disruption of specific protein complexes within this supramolecular target complex may yield a new class of anti-AML drugs with anti-invasion (rather than or in addition to cytotoxic) attributes.
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PMID:Role of leukemia cell invadosome in extramedullary infiltration. 1963 64

Epidemiologic studies support the premise that Allium vegetables may lower the risk of cancers. The beneficial effects appear related to the organosulfur products generated upon processing of Allium. Leukemia cells from patients with acute myeloid leukemia (AML) display high proliferative capacity and have a reduced capacity of undergoing apoptosis and maturation. Whether the sulfur-containing molecules thiosulfinates (TS), diallyl TS (All(2)TS), dipropyl TS (Pr(2)TS) and dimethyl TS (Me(2)TS), are able to exert chemopreventative activity against AML is presently unknown. The present study was an evaluation of proliferation, cytotoxicity, differentiation and secretion of AML cell lines (U937, NB4, HL-60, MonoMac-6) in response to treatment with these TS and their related sulfides (diallylsulfide, diallyl disulfide, dipropyl disulfide, dimethyl disulfide). As assessed by flow cytometry, ELISA, gelatin zymogaphy and RT-PCR, we showed that Pr(2)TS and Me(2)TS, but not All(2)TS and sulfides, 1) inhibited cell proliferation in dose- and time-dependent manner and this process was neither due to cytotoxicity nor apoptosis, 2) induced macrophage maturation, and 3) inhibited the levels of secreted MMP-9 (protein and activity) and TNF-alpha protein, without altering mRNA levels. By establishing for the first time that Pr(2)TS and Me(2)TS affect proliferation, differentiation and secretion of leukemic cell lines, this study provides the opportunity to explore the potential efficiency of these molecules in AML.
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PMID:Allium compounds, dipropyl and dimethyl thiosulfinates as antiproliferative and differentiating agents of human acute myeloid leukemia cell lines. 1970 66


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