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Audo C, Lambert J, Che M, Didillon B. Synthesis of platinum–tin/alumina reforming catalysts from a well-defined platinum–tin precursor complex. Catal Today 2001. [DOI: 10.1016/s0920-5861(00)00589-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hillman GG, Maughan RL, Grignon DJ, Yudelev M, Rubio J, Tekyi-Mensah S, Layer A, Che M, Forman JD. Neutron or photon irradiation for prostate tumors: enhancement of cytokine therapy in a metastatic tumor model. Clin Cancer Res 2001; 7:136-44. [PMID: 11205901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
We have shown that implantation of human prostate carcinoma PC-3 cells in the prostates of nude mice led to the formation of prostate tumors with metastases to para-aortic lymph nodes. We found that day 6 prostate tumors were responsive to systemic injections of interleukin 2 (IL-2) therapy. We have now investigated the combination of primary tumor irradiation and IL-2 for metastatic prostate cancer in this preclinical tumor model. The effect of neutron radiation was compared with that of photon radiation. Advanced prostate tumors (approximately 0.4 cm) were irradiated, and a day later, mice were treated with systemic IL-2 for three weekly cycles. In separate experiments, mice were either sacrificed on day 30 to assess prostate tumor size and tumor histology or followed for survival. A dose-dependent inhibition of prostate tumor growth was caused either by photons or neutrons, but neutrons were more effective than photons with a relative biological effectiveness of 2. The tumor inhibition obtained with 250 cGy neutrons and 500 cGy photons was significant (>75%) and was further increased (> or = 90%) by addition of IL-2 therapy. In survival studies, the combination of radiation and IL-2 showed a significant survival advantage compared with untreated mice (P < or = 0.005) or radiation alone (P < or = 0.003) and an increase in median survival compared with IL-2 alone. Histologically, the combined regimen resulted in a greater degree of tumor destruction, inflammatory response, and vascular damage than that observed with each modality alone. After this combined treatment, no tumor was histologically detected in the para-aortic lymph nodes of these mice, and the lymph nodes were significantly smaller. These findings showed that primary tumor irradiation, either with neutrons or photons, enhanced IL-2 therapeutic effect for the treatment of advanced prostate cancer. This combined modality induced an antitumor response that controlled the growth of prostate tumors and their metastases.
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Lambert JF, Che M. The molecular approach to supported catalysts synthesis: state of the art and future challenges. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1381-1169(00)00318-6] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Balikdjian JP, Davidson A, Launay S, Eckert H, Che M. Sintering and Phase Transformation of V-Loaded Anatase Materials Containing Bulk and Surface V Species. J Phys Chem B 2000. [DOI: 10.1021/jp000569m] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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55
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Costa D, Kermarec M, Che M, Martra G, Girard Y, Chaquin P. A DFT Study of CO Adsorption on NiII Ions 3-Fold Coordinated to Silica. ACTA ACUST UNITED AC 2000. [DOI: 10.1007/0-306-46950-2_15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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56
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Lambert J, Marceau E, Shelimov B, Lehman J, Le Bel de Penguilly V, Carrier X, Boujday S, Pernot H, Che M. Thermal chemistry of oxide-supported platinum catalysts: A comparative study. STUDIES IN SURFACE SCIENCE AND CATALYSIS 2000. [DOI: 10.1016/s0167-2991(00)80336-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Zheng J, Thylin MR, Ghorpade A, Xiong H, Persidsky Y, Cotter R, Niemann D, Che M, Zeng YC, Gelbard HA, Shepard RB, Swartz JM, Gendelman HE. Intracellular CXCR4 signaling, neuronal apoptosis and neuropathogenic mechanisms of HIV-1-associated dementia. J Neuroimmunol 1999; 98:185-200. [PMID: 10430052 DOI: 10.1016/s0165-5728(99)00049-1] [Citation(s) in RCA: 258] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The mechanism(s) by which HIV-1 affects neural injury in HIV-1-associated dementia (HAD) remains unknown. To ascertain the role that cellular and viral macrophage products play in HAD neurotoxicity, we explored one potential route for neuronal demise, CXCR4. CXCR4, expressed on lymphocytes and neurons, is both a part of neural development and a co-receptor for HIV-1. Its ligand, stromal cell-derived factor-1alpha (SDF-1alpha), affects neuronal viability. GTP binding protein (G-protein) linked signaling after neuronal exposure to SDF-1alpha, virus-infected monocyte-derived macrophage (MDM) secretory products, and virus was determined. In both human and rat neurons, CXCR4 was expressed at high levels. SDF-1alpha/beta was detected predominantly in astrocytes and at low levels in MDM. SDF-1beta/beta was expressed in HAD brain tissue and upregulated in astrocytes exposed to virus infected and/or immune activated MDM conditioned media (fluids). HIV-1-infected MDM secretions, virus and SDF-1beta induced a G inhibitory (Gi) protein-linked decrease in cyclic AMP (cAMP) and increase inositol 1,4, 5-trisphosphate (IP3) and intracellular calcium. Such effects were partially blocked by antibodies to CXCR4 or removal of virus from MDM fluids. Changes in G-protein-coupled signaling correlated, but were not directly linked, to increased neuronal synaptic transmission, Caspase 3 activation and apoptosis. These data, taken together, suggest that CXCR4-mediated signal transduction may be a potential mechanism for neuronal dysfunction during HAD.
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Subbotina I, Shelimov B, Kazansky V, Lisachenko A, Che M, Coluccia S. Selective Photocatalytic Reduction of Nitric Oxide by Carbon Monoxide over Silica-Supported Molybdenum Oxide Catalysts. J Catal 1999. [DOI: 10.1006/jcat.1999.2436] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Carrier X, d'Espinose de la Caillerie JB, Lambert JF, Che M. The Support as a Chemical Reagent in the Preparation of WOx/γ-Al2O3 Catalysts: Formation and Deposition of Aluminotungstic Heteropolyanions. J Am Chem Soc 1999. [DOI: 10.1021/ja984081z] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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60
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Gendelman HE, Zheng J, Coulter CL, Ghorpade A, Che M, Thylin M, Rubocki R, Persidsky Y, Hahn F, Reinhard J, Swindells S. Suppression of inflammatory neurotoxins by highly active antiretroviral therapy in human immunodeficiency virus-associated dementia. J Infect Dis 1998; 178:1000-7. [PMID: 9806027 DOI: 10.1086/515693] [Citation(s) in RCA: 135] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
A human immunodeficiency virus type 1 (HIV)-seropositive, antiretroviral-naive patient presented with significant cognitive dysfunction. Neuropsychologic, neuroradiologic, immunologic, and virologic studies confirmed HIV-associated dementia (HAD). After 12 weeks of highly active antiretroviral therapy (HAART) with ibuprofen, dramatic improvements were demonstrated in neurologic function and were sustained for > 1 year. HIV-1 RNA in cerebrospinal fluid (CSF) decreased from 10(5) to 10(4) copies/mL after 4 weeks. After 20 weeks of therapy, plasma viremia decreased from 10(6) copies/mL to undetectable (< 96 copies/mL). Assays of neurotoxins (tumor necrosis factor-alpha, quinolinic acid, and nitric oxide) in plasma and CSF were considerably elevated at presentation and significantly decreased after therapy. Baseline plasma and CSF demonstrated neurotoxic activities in vitro, which also reduced markedly. These data, taken together, support the notion that HAD is a reversible metabolic encephalopathy fueled by viral replication. HAART used with nonsteroidal antiinflammatory agents leads to the suppression of inflammatory neurotoxins and can markedly improve neurologic function in HAD.
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Yang J, Shul Y, Louis C, Che M. In situ EXAFS study of the nucleation and crystal growth of Ni particles on SiO2 support. Catal Today 1998. [DOI: 10.1016/s0920-5861(98)00205-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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62
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Ghorpade A, Xia MQ, Hyman BT, Persidsky Y, Nukuna A, Bock P, Che M, Limoges J, Gendelman HE, Mackay CR. Role of the beta-chemokine receptors CCR3 and CCR5 in human immunodeficiency virus type 1 infection of monocytes and microglia. J Virol 1998; 72:3351-61. [PMID: 9525662 PMCID: PMC109817 DOI: 10.1128/jvi.72.4.3351-3361.1998] [Citation(s) in RCA: 115] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/1997] [Accepted: 12/30/1997] [Indexed: 02/06/2023] Open
Abstract
Human immunodeficiency virus type 1 (HIV-1) infection in mononuclear phagocyte lineage cells (monocytes, macrophages, and microglia) is a critical component in the pathogenesis of viral infection. Viral replication in macrophages serves as a reservoir, a site of dissemination, and an instigator for neurological sequelae during HIV-1 disease. Recent studies demonstrated that chemokine receptors are necessary coreceptors for HIV-1 entry which determine viral tropism for different cell types. To investigate the relative contribution of the beta-chemokine receptors CCR3 and CCR5 to viral infection of mononuclear phagocytes we utilized a panel of macrophage-tropic HIV-1 strains (from blood and brain tissue) to infect highly purified populations of monocytes and microglia. Antibodies to CD4 (OKT4A) abrogated HIV-1 infection. The beta chemokines and antibodies to CCR3 failed to affect viral infection of both macrophage cell types. Antibodies to CCR5 (3A9) prevented monocyte infection but only slowed HIV replication in microglia. Thus, CCR5, not CCR3, is an essential receptor for HIV-1 infection of monocytes. Microglia express both CCR5 and CCR3, but antibodies to them fail to inhibit viral entry, suggesting the presence of other chemokine receptors for infection of these cells. These studies demonstrate the importance of mononuclear phagocyte heterogeneity in establishing HIV-1 infection and persistence.
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MESH Headings
- Animals
- Base Sequence
- Brain/metabolism
- Brain/pathology
- Cells, Cultured
- Chemokine CCL4
- Chemokine CCL5/metabolism
- Chemokine CCL5/pharmacology
- DNA, Complementary
- DNA, Viral/biosynthesis
- Encephalitis, Viral/pathology
- Encephalitis, Viral/virology
- HIV Infections/pathology
- HIV Infections/virology
- HIV Reverse Transcriptase/metabolism
- HIV-1/genetics
- HIV-1/metabolism
- HIV-1/physiology
- Humans
- Macrophage Inflammatory Proteins/metabolism
- Macrophage Inflammatory Proteins/pharmacology
- Mice
- Microglia/metabolism
- Microglia/virology
- Molecular Sequence Data
- Monocytes/metabolism
- Monocytes/virology
- Polymerase Chain Reaction
- Rabbits
- Receptors, CCR3
- Receptors, CCR5/biosynthesis
- Receptors, CCR5/physiology
- Receptors, Chemokine/biosynthesis
- Receptors, Chemokine/physiology
- Virion
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Ghorpade A, Nukuna A, Che M, Haggerty S, Persidsky Y, Carter E, Carhart L, Shafer L, Gendelman HE. Human immunodeficiency virus neurotropism: an analysis of viral replication and cytopathicity for divergent strains in monocytes and microglia. J Virol 1998; 72:3340-50. [PMID: 9525661 PMCID: PMC109814 DOI: 10.1128/jvi.72.4.3340-3350.1998] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/1997] [Accepted: 12/30/1997] [Indexed: 02/06/2023] Open
Abstract
Productive replication of human immunodeficiency virus type 1 (HIV-1) in brain macrophages and microglia is a critical component of viral neuropathogenesis. However, how virus-macrophage interactions lead to neurological disease remains incompletely understood. Possibly, a differential ability of virus to replicate in brain tissue macrophages versus macrophages in other tissues underlies HIV-1 neurovirulence. To these ends, we established systems for the isolation and propagation of pure populations of human microglia and then analyzed the viral life cycles of divergent HIV-1 strains in these cells and in cultured monocytes by using identical viral inocula and indicator systems. The HIV-1 isolates included those isolated from blood, lung tissue, cerebrospinal fluids (CSF), and brain tissues of infected subjects: HIV-1(ADA) and HIV-1(89.6) (from peripheral blood mononuclear cells), HIV-1(DJV) and HIV-1(JR-FL) (from brain tissue), HIV-1(SF162) (from CSF), and HIV-1(BAL) (from lung tissue). The synthesis of viral nucleic acids and viral mRNA, cytopathicity, and release of progeny virions were assessed. A significant heterogeneity among macrophage-tropic isolates for infection of monocytes and microglia was demonstrated. Importantly, a complete analysis of the viral life cycle revealed no preferential differences in the abilities of the HIV-1 strains tested to replicate in microglia and/or monocytes. Macrophage tropism likely dictates the abilities of HIV-1 to invade, replicate, and incite disease within its microglial target cells.
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Carriat JY, Che M, Kermarec M, Verdaguer M, Michalowicz A. Control of Dispersion of Ni2+ Ions via Chelate Ligands in the Preparation of Ni/SiO2 Materials. A XAFS Study. J Am Chem Soc 1998. [DOI: 10.1021/ja9725561] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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65
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Dzwigaj S, Peltre MJ, Massiani P, Davidson A, Che M, Dzwigaj S, Massiani P, Sen T, Sivasanker S. Incorporation of vanadium species in a dealuminated β zeolite. Chem Commun (Camb) 1998. [DOI: 10.1039/a704556e] [Citation(s) in RCA: 126] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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66
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Carrier X, Lambert JF, Che M. Ligand-Promoted Alumina Dissolution in the Preparation of MoOX/γ-Al2O3 Catalysts: Evidence for the Formation and Deposition of an Anderson-type Alumino Heteropolymolybdate. J Am Chem Soc 1997. [DOI: 10.1021/ja971981r] [Citation(s) in RCA: 153] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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67
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Che M, Gatmaitan Z, Arias IM. Ectonucleotidases, purine nucleoside transporter, and function of the bile canalicular plasma membrane of the hepatocyte. FASEB J 1997; 11:101-8. [PMID: 9039951 DOI: 10.1096/fasebj.11.2.9039951] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Ectonucleotidases are enzymes that degrade extracellular nucleotides. Extracellular nucleotides (especially ATP) and their degradation products (particularly adenosine) have multiple effects on cell functions by acting through purinergic receptors. Adenosine nucleotides are present in bile, which suggests that hepatocytes may release nucleotides into the canaliculus where they are promptly degraded into adenosine by ecto-ATPase and 5'-nucleotidase, which have been identified in the canalicular plasma membrane. Adenosine is then transported into hepatocytes by a Na+-dependent nucleoside transporter that is present in the canalicular plasma membrane. Purification and molecular cloning of ecto-ATPase and other canalicular proteins are complicated by an abundant canalicular plasma membrane protein, cCAM 105. However, the recent cloning of an ecto-ATPase (apyrase) from potato tubers provides a new opportunity to identify the canalicular ecto-ATPase. The canalicular Na+-dependent purine nucleoside transporter has been cloned from rat liver. Study of its expression during development and other physiological circumstances suggests that the transporter may play an important role in maintaining hepatic purine levels that are essential for the liver to serve as a major source of purines for tissues (i.e., brain, muscle) that lack pathways for de novo purine biosynthesis.
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Marceau E, Che M, Saint-Just J, Tatibouët J. Influence of chlorine ions in Pt/A12O3 catalysts for methane total oxidation. Catal Today 1996. [DOI: 10.1016/0920-5861(95)00313-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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69
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Davidson A, Tempere JF, Che M, Roulet H, Dufour G. Spectroscopic Studies of Nickel(II) and Nickel(III) Species Generated upon Thermal Treatments of Nickel/Ceria-Supported Materials. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp952268w] [Citation(s) in RCA: 133] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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70
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Che M, Ortiz DF, Arias IM. Primary structure and functional expression of a cDNA encoding the bile canalicular, purine-specific Na(+)-nucleoside cotransporter. J Biol Chem 1995; 270:13596-9. [PMID: 7775409 DOI: 10.1074/jbc.270.23.13596] [Citation(s) in RCA: 125] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
We previously characterized a purine-specific Na(+)-nucleoside cotransport system in bile canalicular membrane. The function of this transport system may be related to conserving nucleosides and preventing cholestasis. We report here the isolation of a cDNA encoding a Na(+)-dependent nucleoside transporter from rat liver using an expression cloning strategy. The substrate specificities and kinetic characteristics of the cloned cotransporter are consistent with the properties of the Na(+)-dependent, purine-selective nucleoside transporter in bile canalicular membranes. The nucleotide sequence predicts a protein of 659 amino acids (72 kDa) with 14 putative membrane-spanning domains. Northern blot analysis showed that the transcripts are present in liver and several other tissues. Data base searches indicate significant sequence similarity to the pyrimidine-selective nucleoside transporter (cNT1) of rat jejunum. Although these two subtypes of Na(+)-nucleoside cotransporter have different substrate specificities and tissue localizations, they are members of a single gene family.
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Nishida T, Che M, Gatmaitan Z, Arias IM. Structure-specific inhibition by bile acids of adenosine triphosphate-dependent taurocholate transport in rat canalicular membrane vesicles. Hepatology 1995; 21:1058-62. [PMID: 7705779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/06/2022]
Abstract
The adenosine triphosphate (ATP)-dependent transport system is a major determinant of canalicular bile acid secretion. The system transports bile acids and neither organic cations nor non-bile acid organic anions, such as glucuronides or glutathione adducts. To define the structural specificity of the ATP-dependent system, the authors examined the ability of various bile acids to inhibit ATP-dependent taurocholate transport by rat liver canalicular membrane vesicles. Only bile acids with a negative charge inhibited transport, which was unaffected by side chain length. Conjugated, but not unconjugated, mono- and di-hydroxy bile acids inhibited transport. The presence of 7 alpha- and 12 alpha-hydroxylation also influenced inhibition of ATP-dependent taurocholate transport. Inhibition of transport by bile acids was kinetically competitive. These results suggest that the canalicular ATP-dependent bile acid transport system depends on bile acid side chain charge, conjugation, and hydroxylation.
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Kermarec M, Decarreau A, Che M, Carriat J. Identification of supported phases produced in the preparation of silica-supported Ni catalysts by competitive cationic exchange. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/s0167-2991(06)81840-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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73
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Br�ckman K, Che M, Haber J, Tatibouet JM. On the physicochemical and catalytic properties of H5PV2Mo10O40 supported on silica. Catal Letters 1994. [DOI: 10.1007/bf00816303] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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74
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Arias IM, Che M, Gatmaitan Z, Leveille C, Nishida T, St Pierre M. The biology of the bile canaliculus, 1993. Hepatology 1993; 17:318-29. [PMID: 8428731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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75
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Che M. Interfacial Coordination Chemistry: Concepts and Relevance to Catalysis Phenomena. STUDIES IN SURFACE SCIENCE AND CATALYSIS 1993. [DOI: 10.1016/s0167-2991(08)64004-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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