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Sprenger T, Yamout B, Comi G, Lebrun-frenay C, Park M, Chinchilla D, Lincoln J, Kappos L, Radue E, Lublin A, Cavalier S, Thangavelu K, Wuerfel J. Investigating the Effect of Teriflunomide on Diffuse Brain Tissue Damage in the Phase 3 TEMSO Study. Mult Scler Relat Disord 2018. [DOI: 10.1016/j.msard.2018.10.088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Rey R, Arizaga E, Verdugo R, Vidal O, Jreige A, Juárez H, Chinchilla D, Colimon F. [Recommendations of the Latin-American network for the study and treatment of the neuropathic pain]. Drugs Today (Barc) 2011; 47 Suppl B:1-33. [PMID: 21785756 DOI: 10.1358/dot.2011.47(suppl.b).1634039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Neuropathic pain (NP) is a kind of pain which is distinct from the somatic or visceral pain that the GP is used to assessing; the clinical profile and the response to treatment of this kind of pain are different. Given its high incidence in the population, it is important that the non-specialized physician should be capable of identifying it early and start treatment. This work attempts to summarize the clinical, diagnostic, pathophysiological and therapeutic aspects of NP to guide the non-specialized physician in the identification and initial treatment of patients suffering from NP. At the same time, the therapeutic options which are only available at centers specialized in the treatment of pain in patients who do not progress satisfactorily are also summarized. This work includes the updates published on the latest guidelines and recommendations, which have had a major impact worldwide. As background to this report, highly-respected professionals from our field published in 2008 an important article in Spanish. This material sets out clinical, pathophysiological and diagnostic concepts which the authors of this work mostly agree with. On the other hand, we differ significantly in the therapeutic aspects.
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Affiliation(s)
- R Rey
- Instituto Argentino de Investigación Neurológica, Buenos Aires, Argentina
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Macías FA, Molinillo JMG, Oliveros-Bastidas A, Marín D, Chinchilla D. Allelopathy. A natural strategy for weed control. Commun Agric Appl Biol Sci 2004; 69:13-23. [PMID: 15759390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Affiliation(s)
- F A Macías
- Grupo de Alelopatía, Departamento de Química Orgánica Facultad de Ciendas, Universidad de Cádiz Apdo. 40, E-11510-Puerto Real, Cádiz, Spain.
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LaFleur DW, Nardelli B, Tsareva T, Mather D, Feng P, Semenuk M, Taylor K, Buergin M, Chinchilla D, Roshke V, Chen G, Ruben SM, Pitha PM, Coleman TA, Moore PA. Interferon-kappa, a novel type I interferon expressed in human keratinocytes. J Biol Chem 2001; 276:39765-71. [PMID: 11514542 DOI: 10.1074/jbc.m102502200] [Citation(s) in RCA: 196] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
High throughput cDNA sequencing has led to the identification of interferon-kappa, a novel subclass of type I interferon that displays approximately 30% homology to other family members. Interferon-kappa consists of 207 amino acids, including a 27-amino acid signal peptide and a series of cysteines conserved in type I interferons. The gene encoding interferon-kappa is located on the short arm of chromosome 9 adjacent to the type I interferon gene cluster and is selectively expressed in epidermal keratinocytes. Expression of interferon-kappa is significantly enhanced in keratinocytes upon viral infection, upon exposure to double-stranded RNA, or upon treatment with either interferon-gamma or interferon-beta. Administration of interferon-kappa recombinant protein imparts cellular protection against viral infection in a species-specific manner. Interferon-kappa activates the interferon-stimulated response element signaling pathway and a panel of genes similar to those regulated by other type I interferons including anti-viral mediators and transcriptional regulators. An antibody that neutralizes the type I interferon receptor completely blocks interferon-kappa signaling, demonstrating that interferon-kappa utilizes the same receptor as other type I interferons. Interferon-kappa therefore defines a novel subclass of type I interferon that is expressed in keratinocytes and expands the repertoire of known proteins mediating host defense.
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Affiliation(s)
- D W LaFleur
- Human Genome Sciences, 9410 Key West Ave., Rockville, MD 20850, USA
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Chinchilla D, Martorano A, Rodriguez E, Villanueva C. Cutaneous tuberculosis: efficient therapeutic response in a case with multiple lesions. Cutis 1999; 64:49-52. [PMID: 10431674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
An unusual case of multiple lesions of tuberculosis verrucosa cutis and colliquative forms is reported. We emphasize a rapid response to conventional therapy.
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Affiliation(s)
- D Chinchilla
- Department of Dermatology, Hospital General de Agudos Juan A. Fernández, Buenos Aires, Argentina
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Abdulaev NG, Karaschuk GN, Ladner JE, Kakuev DL, Yakhyaev AV, Tordova M, Gaidarov IO, Popov VI, Fujiwara JH, Chinchilla D, Eisenstein E, Gilliland GL, Ridge KD. Nucleoside diphosphate kinase from bovine retina: purification, subcellular localization, molecular cloning, and three-dimensional structure. Biochemistry 1998; 37:13958-67. [PMID: 9760230 DOI: 10.1021/bi980853s] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The biochemical and structural properties of bovine retinal nucleoside diphosphate kinase were investigated. The enzyme showed two polypeptides of approximately 17.5 and 18.5 kDa on SDS-PAGE, while isoelectric focusing revealed seven to eight proteins with a pI range of 7.4-8.2. Sedimentation equilibrium yielded a molecular mass of 96 +/- 2 kDa for the enzyme. Carbohydrate analysis revealed that both polypeptides contained Gal, Man, GlcNAc, Fuc, and GalNac saccharides. Like other nucleoside diphosphate kinases, the retinal enzyme showed substantial differences in the Km values for various di- and triphosphate nucleotides. Immunogold labeling of bovine retina revealed that the enzyme is localized on both the membranes and in the cytoplasm. Screening of a retinal cDNA library yielded full-length clones encoding two distinct isoforms (NBR-A and NBR-B). Both isoforms were overexpressed in Escherichia coli and their biochemical properties compared with retinal NDP-kinase. The structures of NBR-A and NBR-B were determined by X-ray crystallography in the presence of guanine nucleotide(s). Both isoforms are hexameric, and the fold of the monomer is similar to other nucleoside diphosphate kinase structures. The NBR-A active site contained both a cGMP and a GDP molecule each bound at half occupancy while the NBR-B active site contained only cGMP.
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Affiliation(s)
- N G Abdulaev
- Center for Advanced Research in Biotechnology, National Institute of Standards and Technology, University of Maryland Biotechnology Institute, Rockville 20850, USA
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Chinchilla D, Schwarz FP, Eisenstein E. Amino acid substitutions in the C-terminal regulatory domain disrupt allosteric effector binding to biosynthetic threonine deaminase from Escherichia coli. J Biol Chem 1998; 273:23219-24. [PMID: 9722552 DOI: 10.1074/jbc.273.36.23219] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Shifts in the sigmoidal kinetics of allosteric threonine deaminase promoted by isoleucine and valine binding control branched chain amino acid biosynthesis in Escherichia coli. A highly conserved alpha-helix in the C-terminal regulatory domain of the tetrameric enzyme was previously implicated in effector binding and feedback inhibition. Double (447, 451) and triple (447, 451, 454) alanine replacements for the conserved amino acids leucine 447, leucine 451, and leucine 454 in this region yield enzyme variants that show increased sigmoidality in steady-state kinetics, and which are less sensitive to the allosteric modifiers isoleucine and valine. Equilibrium binding studies using fluorescence, enzyme kinetic, and calorimetric approaches indicate that the enzyme variants possess reduced affinity for isoleucine and valine, and suggest that heterotropic ligands can bind to the same site to promote their different effects. The increase in sigmoidal kinetics for the mutants relative to wild-type threonine deaminase may be attributable to the elimination of L-threonine binding to the effector sites, which activates the wild-type enzyme. Enzyme kinetic data and isotherms for active site ligand binding to the mutants can be analyzed in terms of a simple two-state model to yield values for allosteric parameters that are consistent with previous estimates based on an expanded two-state model for homotropic cooperativity for threonine deaminase.
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Affiliation(s)
- D Chinchilla
- Center for Advanced Research in Biotechnology, University of Maryland Biotechnology Institute, Rockville, Maryland 20850, USA
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Gallagher DT, Eisenstein E, Fisher KE, Zondlo J, Chinchilla D, Yu HD, Dill J, Winborne E, Ducote K, Xiao G, Gilliland GL. Polymorphous crystallization and diffraction of threonine deaminase from Escherichia coli. Acta Crystallogr D Biol Crystallogr 1998; 54:467-9. [PMID: 9761930 DOI: 10.1107/s0907444997011360] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The biosynthetic threonine deaminase from Escherichia coli, an allosteric tetramer with key regulatory functions, has been crystallized in several crystal forms. Two distinct forms, both belonging to either space group P3121 or P3221, with different sized asymmetric units that both contain a tetramer, grow under identical conditions. Diffraction data sets to 2.8 A resolution (native) and 2. 9 A resolution (isomorphous uranyl derivative) have been collected from a third crystal form in space group I222.
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Affiliation(s)
- D T Gallagher
- Center for Advanced Research in Biotechnology of the University of Maryland Biotechnology Institute and the National Institute of Standards and Technology, 9600 Gudelsky Drive, Rockville, MD 20850, USA.
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Gallagher DT, Gilliland GL, Xiao G, Zondlo J, Fisher KE, Chinchilla D, Eisenstein E. Structure and control of pyridoxal phosphate dependent allosteric threonine deaminase. Structure 1998; 6:465-75. [PMID: 9562556 DOI: 10.1016/s0969-2126(98)00048-3] [Citation(s) in RCA: 143] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Feedback inhibition of biosynthetic threonine deaminase (TD) from Escherichia coli provided one of the earliest examples of protein-based metabolic regulation. Isoleucine, the pathway end-product, and valine, the product of a parallel pathway, serve as allosteric inhibitor and activator, respectively. This enzyme is thus a useful model system for studying the structural basis of allosteric control mechanisms. RESULTS We report the crystal structure of TD at 2.8 A resolution. The tetramer has 222 symmetry, with C-terminal regulatory domains projecting out from a core of catalytic PLP-containing N-terminal domains. The subunits, and especially the regulatory domains, associate extensively to form dimers, which associate less extensively to form the tetramer. Within the dimer, each monomer twists approximately 150 degrees around a thin neck between the domains to place its catalytic domain adjacent to the regulatory domain of the other subunit. CONCLUSIONS The structure of TD and its comparison with related structures and other data lead to the tentative identification of the regulatory binding site and revealed several implications for the allosteric mechanism. This work prepares the way for detailed structure/function studies of the complex allosteric behaviour of this enzyme.
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Affiliation(s)
- D T Gallagher
- University of Maryland, Biotechnology Institute, National Institute of Standards and Technology 9600 Gudelsky Drive, Rockville, Maryland 20850, USA.
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Gallagher T, Eisenstein E, Chinchilla D, Zondlo J, Gilliland G. Structure of the allosteric tetramer threonine deaminase. Acta Crystallogr A 1996. [DOI: 10.1107/s0108767396092239] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Chinchilla D, Dulac O, Robain O, Plouin P, Ponsot G, Pinel JF, Graber D. Reappraisal of Rasmussen's syndrome with special emphasis on treatment with high doses of steroids. J Neurol Neurosurg Psychiatry 1994; 57:1325-33. [PMID: 7964806 PMCID: PMC1073181 DOI: 10.1136/jnnp.57.11.1325] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Eight patients with Rasmussen's syndrome and epilepsia partialis continua were treated with high doses of steroids, including pulses of methylprednisolone and prednisone in decreasing doses. Three patients exhibited clinical, radiological, or histological evidence of bilateral involvement. Epilepsy and focal deficit decreased within six months in seven patients. Only five patients, in whom steroid treatment had begun less than 15 months after the onset of epilepsia partialis continua, experienced a lasting effect although they had periodic episodes of transient relapse. Treatment with high doses of steroids seems advisable during the first year after onset of epilepsia partialis continua, before hemiplegia has developed and in cases with bilateral involvement.
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Affiliation(s)
- D Chinchilla
- Neuropediatric Department Hospital Saint Vincent de Paul, Paris, France
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