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Gómez AM, Lobo F, Pérez de las Vacas D, Valverde S, López JC. Formation and reactivity of new Nicholas–Ferrier pyranosidic cations: novel access to oxepanes via a 1,6-hydride shift/cyclization sequence. Chem Commun (Camb) 2010; 46:6159-61. [DOI: 10.1039/c0cc00586j] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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77
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Gómez AM, Pedregosa A, Barrio A, Valverde S, López JC. Synthesis of FuranosylC-1 Glycals through Palladium-Catalyzed Reactions of a Furanosyl 2,3-Anhydro-exo-glycal. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900585] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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78
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López JC, Ventura J, Uriel C, Gómez AM, Fraser-Reid B. Reaction of 1,2-Orthoesters with HF−Pyridine: A Method for the Preparation of Partly Unprotected Glycosyl Fluorides and Their Use in Saccharide Synthesis. Org Lett 2009; 11:4128-31. [DOI: 10.1021/ol901630d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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79
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Gómez AM, Casillas M, Rodríguez B, Valverde S, López JC. Synthesis of furanoid and pyranoid C-1 aryl glycals by reaction of glycosyl chlorides with organolithium reagents. ARKIVOC 2009. [DOI: 10.3998/ark.5550190.0011.324] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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80
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Gómez AM, Pedregosa A, Casillas M, Uriel C, López JC. Synthesis ofC-1 Alkyl and Aryl Glycals from Pyranosyl or Furanosyl Chlorides by Treatment with Organolithium Reagents. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900417] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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81
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Uriel C, Gómez AM, López JC, Fraser-Reid B. Reciprocal Donor-Acceptor Selectivity: the Influence of the Donor O-2 Substituent in the Regioselective Mannosylation ofmyo-Inositol Orthopentanoate. European J Org Chem 2009. [DOI: 10.1002/ejoc.200800991] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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82
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López JC, Bernal-Albert P, Uriel C, Gómez AM. Ready Transformation of Partially Unprotected Thioglycosides into Glycosyl Fluorides Mediated by NIS/HF-Pyridine or Et3N·3HF. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800754] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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83
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Gómez AM, Casillas M, Barrio A, Gawel A, López JC. Synthesis of Pyranoid and Furanoid Glycals from Glycosyl Sulfoxides by Treatment with Organolithium Reagents. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800318] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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84
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López JC, Bernal-Albert P, Uriel C, Valverde S, Gómez AM. IPy2BF4/HF-Pyridine: A New Combination of Reagents for the Transformation of Partially Unprotected Thioglycosides and n-Pentenyl Glycosides to Glycosyl Fluorides. J Org Chem 2007; 72:10268-71. [DOI: 10.1021/jo7018653] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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85
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Fraser-Reid B, Jayaprakash KN, López JC, Gómez AM, Uriel C. Protecting Groups in Carbohydrate Chemistry Profoundly Influence All Selectivities in Glycosyl Couplings. ACTA ACUST UNITED AC 2007. [DOI: 10.1021/bk-2007-0960.ch007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
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86
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López JC, Uriel C, Guillamón-Martín A, Valverde S, Gómez AM. IPy2BF4-Mediated Transformation of n-Pentenyl Glycosides to Glycosyl Fluorides: A New Pair of Semiorthogonal Glycosyl Donors. Org Lett 2007; 9:2759-62. [PMID: 17580878 DOI: 10.1021/ol070753r] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bis(pyridinium) iodonium(I) tetrafluoroborate (IPy2BF4), a solid and stable reagent, can be used to transform n-pentenyl orthoesters (NPOEs) and n-pentenyl glycosides (NPGs) into glycosyl fluorides. The latter pair constitutes a new set of semiorthogonal glycosyl donors that can be used in glycosylation strategies, alone or in combination with NPOEs.
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87
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Arjona O, Gómez AM, López JC, Plumet J. Synthesis and Conformational and Biological Aspects of Carbasugars. Chem Rev 2007; 107:1919-2036. [PMID: 17488060 DOI: 10.1021/cr0203701] [Citation(s) in RCA: 277] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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88
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Gómez AM, Company MD, Uriel C, Valverde S, López JC. 6-endo Versus 5-exo radical cyclization: streamlined syntheses of carbahexopyranoses and derivatives by 6-endo-trig radical cyclization. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2006.12.108] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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89
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de la Fuente M, Blanco MJ, Pazos B, Fernández MI, Carracedo A, Sánchez-Salorio M, Coco RM, Torrón C, Gómez AM. Complement factor H. Ophthalmology 2007; 114:193.e1-2. [PMID: 17198855 DOI: 10.1016/j.ophtha.2006.10.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2006] [Accepted: 10/03/2006] [Indexed: 11/21/2022] Open
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90
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Gómez AM, Barrio A, Amurrio I, Valverde S, Jarosz S, López JC. Convergent stereocontrolled synthesis of substituted exo-glycals by Stille cross-coupling of halo-exo-glycals and stannanes. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.06.133] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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91
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Gómez AM, Uriel C, Valverde S, López JC. Formation and Reactivity of Novel Pyranosidic Nicholas Oxocarbenium Ions: Access toC-Ketosides and Branched-ChainC-Ketosides. Org Lett 2006; 8:3187-90. [PMID: 16836362 DOI: 10.1021/ol060929+] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[Structure: see text] Dicobalt hexacarbonyl propargyl complexes, prepared from alkynyl ketoses, display an unexpected reactivity when treated with Lewis acids in the presence of nucleophiles and furnish C-ketosides, branched-chain C-ketosides, or branched-chain C-glycals depending on the nucleophile and the carbohydrate starting material.
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Pereira L, Matthes J, Schuster I, Valdivia HH, Herzig S, Richard S, Gómez AM. Mechanisms of [Ca2+]i transient decrease in cardiomyopathy of db/db type 2 diabetic mice. Diabetes 2006; 55:608-15. [PMID: 16505222 DOI: 10.2337/diabetes.55.03.06.db05-1284] [Citation(s) in RCA: 197] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Cardiovascular disease is the leading cause of death in the diabetic population. However, molecular mechanisms underlying diabetic cardiomyopathy remain unclear. We analyzed Ca2+-induced Ca2+ release and excitation-contraction coupling in db/db obese type 2 diabetic mice and their control littermates. Echocardiography showed a systolic dysfunction in db/db mice. Two-photon microscopy identified intracellular calcium concentration ([Ca2+]i) transient decrease in cardiomyocytes within the whole heart, which was also found in isolated myocytes by confocal microscopy. Global [Ca2+]i transients are constituted of individual Ca2+ sparks. Ca2+ sparks in db/db cardiomyocytes were less frequent than in +/+ myocytes, partly because of a depression in sarcoplasmic reticulum Ca2+ load but also because of a reduced expression of ryanodine receptor Ca2+ channels (RyRs), revealed by [3H]ryanodine binding assay. Ca2+ efflux through Na+/Ca2+ exchanger was increased in db/db myocytes. Calcium current, I(Ca), triggers sarcoplasmic reticulum Ca2+ release and is also involved in sarcoplasmic reticulum Ca2+ refilling. Macroscopic I(Ca) was reduced in db/db cells, but single Ca2+ channel activity was similar, suggesting that diabetic myocytes express fewer functional Ca2+ channels, which was confirmed by Western blots. These results demonstrate that db/db mice show depressed cardiac function, at least in part, because of a general reduction in the membrane permeability to Ca2+. As less Ca2+ enters the cell through I(Ca), less Ca2+ is released through RyRs.
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93
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Fonseca-Aten M, Salvatore CM, Mejías A, Ríos AM, Chávez-Bueno S, Katz K, Gómez AM, McCracken GH, Hardy RD. Evaluation of LBM415 (NVP PDF-713), a novel peptide deformylase inhibitor, for treatment of experimental Mycoplasma pneumoniae pneumonia. Antimicrob Agents Chemother 2006; 49:4128-36. [PMID: 16189089 PMCID: PMC1251520 DOI: 10.1128/aac.49.10.4128-4136.2005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Mycoplasma pneumoniae is a major cause of community-acquired pneumonia. We evaluated the efficacy of LBM415, a novel peptide deformylase inhibitor antimicrobial agent, for the treatment of M. pneumoniae pneumonia in a mouse model. Eight-week-old BALB/c mice were intranasally inoculated once with 10(7) CFU of M. pneumoniae. Groups of mice were treated with LBM415 (50 mg/kg of body weight) or placebo subcutaneously daily for 13 days, starting 24 h after inoculation. Groups of mice were evaluated at the baseline; at days of treatment 1, 3, 6, and 13; and at 7 days after treatment. The MIC of LBM415 against M. pneumoniae was <0.005 microg/ml. LBM415-treated mice had significantly lower bronchoalveolar lavage fluid M. pneumoniae concentrations than placebo-treated mice on days 6 and 13 of treatment. Compared with placebo treatment, therapy with LBM415 significantly decreased lung histopathology scores at days 3, 6, and 13 of treatment and at 7 days after treatment. Airway obstruction was significantly lower in LBM415-treated mice than in placebo-treated mice on days 1, 3, and 6 of treatment and after 7 days of therapy, while airway hyperresponsiveness was significantly lower only on day 3 of therapy. The bronchoalveolar lavage fluid concentrations of tumor necrosis factor alpha, gamma interferon (IFN-gamma), interleukin-6 (IL-6), IL-12, KC (functional IL-8), monocyte chemotactic protein 1, macrophage inflammatory protein 1alpha, monokine induced by IFN-gamma, and IFN-inducible protein 10 were significantly reduced in LBM415-treated mice compared with the levels in placebo-treated mice. There were no differences in the bronchoalveolar lavage fluid concentrations of granulocyte-macrophage colony-stimulating factor, IL-1beta, IL-2, IL-4, IL-5, and IL-10 between the two groups of mice. LBM415 therapy had beneficial microbiologic, histologic, respiratory, and immunologic effects on acute murine M. pneumoniae pneumonia.
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Farrell EF, Antaramian A, Benkusky N, Zhu X, Rueda A, Gómez AM, Valdivia HH. Regulation of cardiac excitation-contraction coupling by sorcin, a novel modulator of ryanodine receptors. Biol Res 2005; 37:609-12. [PMID: 15709688 DOI: 10.4067/s0716-97602004000400015] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Activation of Ca2+ release channels/ryanodine receptors (RyR) by the inward Ca2+ current (I(Ca)) gives rise to Ca(2+)-induced Ca2+ release (CICR), the amplifying Ca2+ signaling mechanism that triggers contraction of the heart. CICR, in theory, is a high-gain, self-regenerating process, but an unidentified mechanism stabilizes it in vivo. Sorcin, a 21.6 kDa Ca(2+)-binding protein, binds to cardiac RyRs with high affinity and completely inhibits channel activity. Sorcin significantly inhibits both the spontaneous activity of RyRs in quiescent cells (visualized as Ca2+ sparks) and the I(Ca)-triggered activity of RyRs that gives rise to [Ca2+]i transients. Since sorcin decreases the amplitude of the [Ca2+]i transient without affecting the amplitude of I(Ca), the overall effect of sorcin is to reduce the "gain" of excitation-contraction coupling. Immunocytochemical staining shows that sorcin localizes to the dyadic space of ventricular cardiac myocytes. Ca2+ induces conformational changes and promotes translocation of sorcin between soluble and membranous compartments, but the [Ca2+] required for the latter process (ED50 = approximately 200 microM) appears to be reached only within the dyadic space. Thus, sorcin is a potent inhibitor of both spontaneous and I(Ca)-triggered RyR activity and may play a role in helping terminate the positive feedback loop of CICR.
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95
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Uriel C, Agocs A, Gómez AM, López JC, Fraser-Reid B. Relevance of the Glycosyl Donor to the Regioselectivity of Glycosidation of Primary-Secondary Diol Acceptors and Application of These Ideas to in Situ Three-Component Double Differential Glycosidation. Org Lett 2005; 7:4899-902. [PMID: 16235917 DOI: 10.1021/ol0518232] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] Three pairs of primary-secondary diol acceptors have been exposed to armed, disarmed, and n-pentenyl ortho ester glycosyl donors in glycosidation reactions. It is shown that the regioselectivity of those glycosylations is greatly influenced by the armed, disarmed, or ortho ester nature of the glycosyl donors. The selectivities observed have been used to devise efficient in situ three-component glycosylations involving two donors and one acceptor.
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López JC, Agocs A, Uriel C, Gómez AM, Fraser-Reid B. Iterative, orthogonal strategy for oligosaccharide synthesis based on the regioselective glycosylation of polyol acceptors with partially unprotected n-pentenyl-orthoesters: further evidence for reciprocal donor acceptor selectivity (RDAS). Chem Commun (Camb) 2005:5088-90. [PMID: 16220180 DOI: 10.1039/b507468a] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient iterative, orthogonal protocol based on the regioselective glycosyl coupling of D-mannose polyols with, partially unprotected, n-pentenyl orthoester donors permits the synthesis of linear and branched oligosaccharides with minimal protecting group tampering.
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Gómez AM, Company MD, Agocs A, Uriel C, Valverde S, López JC. Synthesis of 2,3:4,6-di-O-isopropylidene-d-allopyranose from d-glucose. Carbohydr Res 2005; 340:1872-5. [PMID: 15979053 DOI: 10.1016/j.carres.2005.05.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2005] [Revised: 04/12/2005] [Accepted: 05/28/2005] [Indexed: 11/30/2022]
Abstract
2,3:4,6-Di-O-isopropylidene-d-allopyranose can be conveniently prepared from d-glucose via a synthetic sequence, which includes Mitsunobu inversion at O-3, di-O-isopropylidenation of phenyl-1-thio-d-alloside and anomeric deprotection on treatment with NBS/CaCO3.
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Villar Luque LM, Sau Llanas P, Cantero Sánchez M, Maldonado Taillefer M, Gómez AM. Estudio con PET-FDG en paciente con antecedentes de leiomiosarcoma uterino durante la menstruación con resultado falso positivo. ACTA ACUST UNITED AC 2005; 24:205-6. [PMID: 15847790 DOI: 10.1157/13073794] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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99
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Chávez-Bueno S, Mejías A, Gómez AM, Olsen KD, Ríos AM, Fonseca-Aten M, Ramilo O, Jafri HS. Respiratory syncytial virus-induced acute and chronic airway disease is independent of genetic background: an experimental murine model. Virol J 2005; 2:46. [PMID: 15916706 PMCID: PMC1183251 DOI: 10.1186/1743-422x-2-46] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2005] [Accepted: 05/25/2005] [Indexed: 11/23/2022] Open
Abstract
Background Respiratory syncytial virus (RSV) is the leading respiratory viral pathogen in young children worldwide. RSV disease is associated with acute airway obstruction (AO), long-term airway hyperresponsiveness (AHR), and chronic lung inflammation. Using two different mouse strains, this study was designed to determine whether RSV disease patterns are host-dependent. C57BL/6 and BALB/c mice were inoculated with RSV and followed for 77 days. RSV loads were measured by plaque assay and polymerase chain reaction (PCR) in bronchoalveolar lavage (BAL) and whole lung samples; cytokines were measured in BAL samples. Lung inflammation was evaluated with a histopathologic score (HPS), and AO and AHR were determined by plethysmography. Results Viral load dynamics, histopathologic score (HPS), cytokine concentrations, AO and long-term AHR were similar in both strains of RSV-infected mice, although RSV-infected C57BL/6 mice developed significantly greater AO compared with RSV-infected BALB/c mice on day 5. PCR detected RSV RNA in BAL samples of RSV infected mice until day 42, and in whole lung samples through day 77. BAL concentrations of cytokines TNF-α, IFN-γ, and chemokines MIG, RANTES and MIP-1α were significantly elevated in both strains of RSV-infected mice compared with their respective controls. Viral load measured by PCR significantly correlated with disease severity on days 14 and 21. Conclusion RSV-induced acute and chronic airway disease is independent of genetic background.
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Cid MB, Valverde S, López JC, Gómez AM, García M. Study of the Regioselectivity of Intra- and Intermolecular Glycosylations of Mannoside Diol Acceptors. Synlett 2005. [DOI: 10.1055/s-2005-865228] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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