Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0026764 (multiple myeloma)
 36,148 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Malignant plasma cells in multiple myeloma home to the bone marrow (BM), accumulate in different niches and, in late disease, migrate from the BM into blood. These migratory events involve cell trafficking across extracellular matrix (ECM)-rich basement membranes and interstitial tissues. Metalloproteinases (MMP) degrade ECM and facilitate tumour cell invasion. The chemokine CXCL12 is expressed in the BM, and it was previously shown that it triggers myeloma cell migration and activation. In the present work we show that CXCL12 promotes myeloma cell invasion across Matrigel-reconstituted basement membranes and type I collagen gels. MMP-9 activity was required for invasion through Matrigel towards CXCL12, whereas TIMP-1, a MMP-9 inhibitor that we found to be expressed by myeloma and BM stromal cells, impaired the invasion. In addition, we show that the membrane-bound MT1-MMP metalloproteinase is expressed by myeloma cells and contributes to CXCL12-promoted myeloma cell invasion across Matrigel. Increase in MT1-MMP expression, as well as induction of its membrane polarization by CXCL12 in myeloma cells, might represent potential mechanisms contributing to this invasion. CXCL12-promoted invasion across type I collagen involved metalloproteinases different from MT1-MMP. These data indicate that CXCL12 could contribute to myeloma cell trafficking in the BM involving MMP-9 and MT1-MMP activities.
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PMID:Role of metalloproteinases MMP-9 and MT1-MMP in CXCL12-promoted myeloma cell invasion across basement membranes. 1627 22

The chemokine receptor CXCR4 is widely expressed on different cell types, is involved in leukocyte chemotaxis, and is a co-receptor for HIV. AMD3100 has been shown to be a CXCR4 receptor antagonist, and to block HIV infection of T-tropic, X4-using, virus in vitro and in vivo. AMD3100 is an effective mobilizer of hematopoietic stem cells and is being investigated in clinical trials in multiple myeloma and non-Hodgkins lymphoma patients. Using the CCRF-CEM T-cell line that constitutively expresses CXCR4 we confirmed that AMD3100 was an antagonist of SDF-1/CXCL12 ligand binding (IC50=651+/-37 nM). We have also shown that AMD3100 inhibits SDF-1 mediated GTP-binding (IC50=27+/-2.2 nM), SDF-1 mediated calcium flux (IC50=572+/-190 nM), and SDF-1 stimulated chemotaxis (IC50=51+/-17 nM). AMD3100 did not inhibit calcium flux against cells expressing CXCR3, CCR1, CCR2b, CCR4, CCR5 or CCR7 when stimulated with their cognate ligands, nor did it inhibit receptor binding of LTB4. AMD3100 did not, on its own, induce a calcium flux in the CCRF-CEM cells, which express multiple GPCRs including CXCR4, CCR4 and CCR7. Furthermore, AMD3100 neither stimulated GTP-binding, an assay for GPCR activation, in CEM cell membranes; nor chemotaxis of CCRF-CEM cells. These data therefore demonstrate that AMD3100 is a specific antagonist of CXCR4, is not cross-reactive with other chemokine receptors, and is not an agonist of CXCR4.
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PMID:Characterization of the molecular pharmacology of AMD3100: a specific antagonist of the G-protein coupled chemokine receptor, CXCR4. 1681 9

Multiple myeloma (MM) is a product of interactions between tumor plasma cells and multiple cell types native to the bone marrow (BM). We have used antibody array technology to examine the proteins produced by BM stromal cells in response to stimulation by BM taken from patients diagnosed with monoclonal gammopathy of undetermined significance (MGUS), smoldering multiple myeloma (SMM), and MM. We observed increased production of the chemokine IL-8 by stromal cells co-cultured with supernatants from bone marrow cells of patients with active myeloma. IL-8 production is correlated with active disease and is dependent upon IL-1beta and NF-kappaB signaling. Consistent with the pro-angiogenic activity of IL-8, increased BM microvessel density (MVD) correlated with stimulation of stromal cell IL-8 production. In addition, the majority of MM cell lines and MM patient plasma cells were found to express IL-8 receptors CXCR1 and CXCR2. We conclude that stromal cell IL-8 production parallels MM disease activity, is IL-1beta induced, and correlates with bone marrow angiogenesis.
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PMID:Cytokine and chemokine profiles in multiple myeloma; significance of stromal interaction and correlation of IL-8 production with disease progression. 1687 67

Multiple myeloma (MM) is a plasma cell malignancy, characterized by the localization of the MM cells in the bone marrow (BM), where they proliferate and induce osteolysis. The MM cells first need to home or migrate to the BM to receive necessary survival signals. In this work, we studied the role of CCR1 and CCR5, two known chemokine receptors, in both chemotaxis and osteolysis in the experimental 5TMM mouse model. A CCR1-specific (BX471) and a CCR5-specific (TAK779) antagonist were used to identify the function of both receptors. We could detect by RT-PCR and flow cytometric analyses the expression of both CCR1 and CCR5 on the cells and their major ligand, macrophage inflammatory protein 1alpha (MIP1alpha) could be detected by ELISA. In vitro migration assays showed that MIP1alpha induced a 2-fold increase in migration of 5TMM cells, which could only be blocked by TAK779. In vivo homing kinetics showed a 30% inhibition in BM homing when 5TMM cells were pre-treated with TAK779. We found, in vitro, that both inhibitors were able to reduce osteoclastogenesis and osteoclastic resorption. In vivo end-term treatment of 5T2MM mice with BX471 resulted in a reduction of the osteolytic lesions by 40%; while TAK779 treatment led to a 20% decrease in lesions. Furthermore, assessment of the microvessel density demonstrated a role for both receptors in MM induced angiogenesis. These data demonstrate the differential role of CCR1 and CCR5 in MM chemotaxis and MM associated osteolysis and angiogenesis.
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PMID:Role of CCR1 and CCR5 in homing and growth of multiple myeloma and in the development of osteolytic lesions: a study in the 5TMM model. 1708 56

The mechanisms by which multiple myeloma (MM) cells migrate and home to the bone marrow are not well understood. In this study, we sought to determine the effect of the chemokine SDF-1 (CXCL12) and its receptor CXCR4 on the migration and homing of MM cells. We demonstrated that CXCR4 is differentially expressed at high levels in the peripheral blood and is down-regulated in the bone marrow in response to high levels of SDF-1. SDF-1 induced motility, internalization, and cytoskeletal rearrangement in MM cells evidenced by confocal microscopy. The specific CXCR4 inhibitor AMD3100 and the anti-CXCR4 antibody MAB171 inhibited the migration of MM cells in vitro. CXCR4 knockdown experiments demonstrated that SDF-1-dependent migration was regulated by the P13K and ERK/ MAPK pathways but not by p38 MAPK. In addition, we demonstrated that AMD3100 inhibited the homing of MM cells to the bone marrow niches using in vivo flow cytometry, in vivo confocal microscopy, and whole body bioluminescence imaging. This study, therefore, demonstrates that SDF-1/CXCR4 is a critical regulator of MM homing and that it provides the framework for inhibitors of this pathway to be used in future clinical trials to abrogate MM trafficking.
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PMID:Mechanisms of regulation of CXCR4/SDF-1 (CXCL12)-dependent migration and homing in multiple myeloma. 1711 15

V regions of monoclonal Ig express an exquisite B-cell tumor-specific antigen called idiotype (Id). Id is a weak antigen and it is important to improve immunogenicity of Id vaccines. Chemokine receptors are expressed on antigen-presenting cells (APCs) and are promising targets for Id vaccines. Here we compare monomeric and dimeric forms of MIP-1alpha and RANTES that target Id to APCs in a mouse B lymphoma (A20) and a multiple myeloma model (MOPC315). MIP-1alpha was more potent than RANTES. The dimeric proteins were more potent than monomeric equivalents in short-term assays. When delivered in vivo by intramuscular injection of plasmids followed by electroporation, dimeric proteins efficiently primed APCs in draining lymph nodes for activation and proliferation of Id-specific CD4(+) T cells. Good anti-Id antibody responses were obtained, and mice immunized only once were 60% to 80% protected in both tumor models. CD8(+) T cells contributed to the protection. Antibody responses and tumor protection were reduced when the human Ig hinge = C(H)3 dimerization motif was replaced with syngeneic mouse counterparts, indicating that tumor-protective responses were dependent on xenogeneic sequences. The results suggest that bivalency and foreign sequences combine to increase the efficiency of chemokine-Id DNA vaccines.
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PMID:Chemokine-idiotype fusion DNA vaccines are potentiated by bivalency and xenogeneic sequences. 1754 Aug 47

The conditioning regimens for autologous SCT (auto-SCT) lead to impairment of the immune system and concomitant increase in susceptibility to infections. We studied the recovery of cellular immunity by in vitro analysis of T-cell proliferation and cytokine production profiles during the first 15 months after auto-SCT in patients with multiple myeloma and non-Hodgkin's lymphoma. PBMC were collected at 6, 9 and 15 months after transplantation and stimulated with a combination of CD2 and CD28 monoclonal antibodies, with PHA or with tetanus toxoid as recall antigen. A multiplex enzyme linked immunoassay was used to determine levels of Th1 cytokines IL-2, IFN-gamma and tumour-necrosis factor-alpha (TNF-alpha), Th2 cytokines IL-4, IL-5 and IL-13, the regulatory cytokine IL-10 and the proinflammatory cytokines IL-1alpha, IL-1beta, IL-6 and the chemokine IL-8. T-cell proliferation progressively increased from 6 to 15 months after auto-SCT. Overall, cytokine production increased after auto-SCT. Production of Th2 cytokines IL-5 and IL-13 was superior to production of Th1 cytokines IFN-gamma and TNF-alpha. We hypothesize that prolonged impairment of IFN-gamma production might contribute to the relatively high incidence of viral infections after auto-SCT.
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PMID:Development of T cell-mediated immunity after autologous stem cell transplantation: prolonged impairment of antigen-stimulated production of gamma-interferon. 1756 37

The efficient antigen-presenting function of dendritic cells (DC) makes them an attractive cellular adjuvant for clinical immunotherapeutic protocols aimed at eradicating minimal residual disease after conventional treatment of multiple myeloma (MM) and other malignancies. We used single-step positive immunoselection with biotinylated CMRF-56 monoclonal antibody to generate a CD11c blood DC (BDC) enriched antigen-presenting cell population, which, after exposure to activation stimuli for as little as 2 hours, displayed a mature costimulatory BDC phenotype and secreted inflammatory cytokines. Of the activation stimuli tested, granulocyte macrophage colony-stimulating factor (GM-CSF) provided optimal activation of the CMRF-56 immunoselected preparations and primed efficient cytotoxic T cell (CTL) responses using MART-1 peptide as a model tumor-associated antigen. In addition, GM-CSF activated CMRF-56 immunoselected cells cross-presented MM cell lysate and improved the MM-specific polyclonal CTL response (no activation 18.8%+/-4.3% vs. GM-CSF activation 40.9%+/-7.3%, P=0.051). CMRF-56 immunoselected BDC migrated in vitro both spontaneously and specifically toward the secondary lymphoid chemokine CCL21. Their migration was also significantly improved by GM-CSF and prostaglandin E2 activation and a greater percentage of activated BDC migrated specifically compared with monocyte-derived DC. These results indicate that the CMRF-56 immunoselected BDC preparations can cross-present antigen for effective anti-MM CTL responses and that limited exposure to maturation stimuli can produce phenotypically and functionally mature migrating DC. CMRF-56 immunoselected cells are suitable for use as part of an immunotherapeutic anti-MM vaccine.
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PMID:CMRF-56 immunoselected blood dendritic cell preparations activated with GM-CSF induce potent antimyeloma cytotoxic T-cell responses. 1789 66

Gaucher disease is an inherited recessive autosomal metabolic defect due to a deficiency of the lysosomal enzyme beta-glucocerebrosidase. The enzyme substrate, glucocerebroside, accumulates in the body, predominantly in the liver, spleen, and bone marrow. Osteoarticular manifestations are often inaugural and contribute much of the morbidity and disability associated with Gaucher disease. There are three types of Gaucher disease. The most common is type 1, which can produce a broad range of presentations characterized by cytopenia and involvement of the spleen, liver, and bone marrow. Types 2 and 3 are rarest variants that manifest in infancy and cause neurologic damages. Patients with type 2 Gaucher disease usually die before 2years of age. beta-glucocerebrosidase assays and examination of bone marrow smears and biopsies ensure the diagnosis. Specific mutations in the beta-glucocerebrosidase gene are associated with specific clinical presentations: thus, the N370S mutation (heterozygous or homozygous) confers type 1 disease and the L444P mutation neurologic involvement and type 3 disease. Bone involvement is a feature in 70%-100% of cases. Abnormal bone remodeling, osteonecrosis and bony infarcts, osteopenia with fractures, and more rarely infections may occur. The other manifestations are dominated by cytopenia (thrombocytopenia, neutropenia, or anemia), hypersplenism, and liver enlargement. The risk of myeloma is increased. Parkinson-like syndromes were recently described in patients with type 1 disease. The enzyme chitotriosidase can be assayed to quantify the degree of macrophage activation. The chemokine CCL18 is another valuable marker but is not readily available in everyday practice. The treatment of Gaucher disease includes symptomatic drugs to relieve pain. Splenectomy is rarely necessary now that specific treatments are available. Enzyme replacement therapy (imiglucerase) has considerably improved the management of the highest risk patients. More recently, an enzyme inhibitor that decreases the production of the substrate (miglustat) was introduced. Chemical chaperone therapy and gene therapy hold promise for the future.
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PMID:Gaucher disease. 1799 73

Chemokine-controlled migration plays a critical role in B-cell development, differentiation, and function, as well as in the pathogenesis of B-cell malignancies, including the plasma cell neoplasm multiple myeloma (MM). Here, we demonstrate that stimulation of B cells and MM cells with the chemokine stromal cell-derived factor-1 (SDF-1) induces strong migration and activation of the Ras-like GTPase Ral. Inhibition of Ral, by expression of the dominant negative RalN28 mutant or of RalBPDeltaGAP, a Ral effector mutant that sequesters active Ral, results in impaired SDF-1-induced migration of B cells and MM cells. Of the 2 Ral isoforms, RalA and RalB, RalB was found to mediate SDF-1-induced migration. We have recently shown that Btk, PLCgamma2, and Lyn/Syk mediate SDF-1-controlled B-cell migration; however, SDF-1-induced Ral activation is not affected in B cells deficient in these proteins. In addition, treatment with pharmacological inhibitors against PI3K and PLC or expression of dominant-negative Ras did not impair SDF-1-induced Ral activation. Taken together, these results reveal a novel function for Ral, that is, regulation of SDF-1-induced migration of B cells and MM cells, thereby providing new insights into the control of B-cell homeostasis, trafficking, and function, as well as into the pathogenesis of MM.
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PMID:The small GTPase Ral mediates SDF-1-induced migration of B cells and multiple myeloma cells. 1822 51


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