Igor Dozmorov

University of Texas Southwestern Medical Center, Dallas, Texas, United States

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Publications (97)284.03 Total impact

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    ABSTRACT: Changes in immune function during the course of systemic lupus erythematosus (SLE) are well characterized. Class-switched antinuclear antibodies are the hallmark of SLE, and T/B- cell interactions are thus critical. However, changes in immune function contributing to disease susceptibility are unknown. Here, we have analyzed primary T and B cells from a mouse model of SLE prior to the onset of disease. To allow cognate T-cell activation with low affinity, we have developed a lower potency peptide ligand for the OTII T-cell receptor. T and B-cell couples formed less frequently and retained their polarity less efficiently preferentially in response to low affinity stimulation in SLE-prone mice. This matched decreased recruitment of actin and Vav1 and an enhanced PKCΘ recruitment to the cellular interface in T cells. The induction of the germinal center B-cell marker GL7 was increased in T/B cell couples from SLE-prone mice when the T-cell numbers were limited. However, the overall gene expression changes were marginal. Taken together, the enhanced cell couple transience may allow a more efficient sampling of a large number of T/B cell couples, preferentially in response to limiting stimuli, therefore enhancing the immune reactivity in the development of SLE.This article is protected by copyright. All rights reserved
    European Journal of Immunology 09/2014; · 4.97 Impact Factor
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    ABSTRACT: The breakdown in tolerance of autoreactive B cells in the lupus-prone NZM2410-derived B6.Sle1.Sle2.Sle3 (TC) mice results in the secretion of autoantibodies. TC dendritic cells (DCs) enhance B cell proliferation and antibody secretion in a cytokine-dependent manner. However, the specific cytokine milieu by which TC DCs activate B cells was not known. In this study, we compared TC and C57BL/6 (B6) control for the distribution of DC subsets and for their production of cytokines affecting B cell responses. We show that TC DCs enhanced B cell proliferation through the production of IL-6 and IFN-γ, while antibody secretion was only dependent on IL-6. Pre-disease TC mice showed an expanded PDCA1+ cells prior to disease onset that was localized to the marginal zone and further expanded with age. The presence of PDCA1+ cells in the marginal zone correlated with a Type I Interferon (IFN) signature in marginal zone B cells, and this response was higher in TC than B6 mice. In vivo administration of anti-chromatin immune complexes upregulated IL-6 and IFN-γ production by splenic DCs from TC but not B6 mice. The production of BAFF and APRIL was decreased upon TC DC stimulation both in vitro and in vivo, indicating that these B cell survival factors do not play a role in B cell modulation by TC DCs. Finally, TC B cells were defective at downregulating IL-6 expression in response to anti-inflammatory apoptotic cell exposure. Overall, these results show that the TC autoimmune genetic background induces the production of B cell-modulating inflammatory cytokines by DCs, which are regulated by the microenvironment as well as the interplay between DC.
    PLoS ONE 01/2014; 9(8):e102151. · 3.53 Impact Factor
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    ABSTRACT: Background: The mechanisms of pathogenesis of respiratory syncytial virus (RSV) remain poorly defined. It is not clear why certain infants are prone to severe RSV infection. We sought to determine whether there was variation in the innate immune response to RSV among individuals. Likewise, we sought to determine whether clinical isolates of RSV differ in their capacity to activate gene expression during infection of primary human macrophages. Methods: Clinical isolates of RSV were used to infect primary human macrophages from a variety of donors. Concentrations of secreted cytokines were determined by Bio-Plex assay. The transcriptome of infected cells were determined utilizing RNA-SEQ technology. Heatmaps of gene expression dynamics in infected cells were generated with the Spotfire Decision Site 9 software. Gene subsets were created from the list of genes involved in response to viral infection. Functional analysis of identified genes was performed with Ingenuity Pathway Analysis. Results: RSV activated genes involved in multiple processes including response to virus entry, virus replication, virus recognition, activation of the innate immune system and response to interferon. Overall, at least 2 distinct patterns were observed among donors suggesting that the innate response to viral infection differs among individuals. Furthermore, we observed distinct patterns of activation of genes among different clinical isolates of RSV. These data suggest that there is significant variability of clinical isolates of RSV to activate or inhibit the innate immune system. Signaling pathway analyses revealed that the magnitude of pathway activation, rather than the specific pathways activated accounted for the differences in gene expression among the viruses studied. Conclusion: These data suggest that the innate immune response to RSV may determine the severity of disease. Our data also indicates that RSV strains are not homogeneous with regard to activation or inhibition of the innate immune response in primary human macrophages. Identification of the viral genetic polymorphisms associated with activation or inhibition of the innate immune response may lead to the development of effective antiviral agents and vaccines.
    IDWeek 2013 Meeting of the Infectious Diseases Society of America; 10/2013
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    ABSTRACT: Patients with 22q11.2 deletion syndrome have heterogeneous clinical presentations including immunodeficiency, cardiac anomalies, and hypocalcemia. The syndrome arises from hemizygous deletions of up to 3Mb on chromosome 22q11.2, a region that contains 60 genes and 4 microRNAs. MicroRNAs are important post-transcriptional regulators of gene expression, with mutations in several microRNAs causal to specific human diseases. We characterized the microRNA expression patterns in the peripheral blood of patients with 22q11.2 deletion syndrome (n=31) compared to normal controls (n=22). Eighteen microRNAs had a statistically significant differential expression (p<0.05), with miR-185 expressed at 0.4× normal levels. The 22q11.2 deletion syndrome cohort exhibited microRNA expression hyper-variability and group dysregulation. Selected microRNAs distinguished patients with cardiac anomalies, hypocalcemia, and/or low circulating T cell counts. In summary, microRNA profiling of chromosome 22q11.2 deletion syndrome/DiGeorge patients revealed a signature microRNA expression pattern distinct from normal controls with clinical relevance.
    Clinical Immunology 01/2013; 147(1):11-22. · 3.77 Impact Factor
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    ABSTRACT: Recent application of gene expression profiling to the immune system has shown a great potential for characterization of complex regulatory processes. It is becoming increasingly important to characterize functional systems through multigene interactions to provide valuable insights into differences between healthy controls and autoimmune patients. Here we apply an original systematic approach to the analysis of changes in regulatory gene interconnections between in Epstein-Barr virus transformed hyperresponsive B cells from SLE patients and normal control B cells. Both traditional analysis of differential gene expression and analysis of the dynamics of gene expression variations were performed in combination to establish model networks of functional gene expression. This Pathway Dysregulation Analysis identified known transcription factors and transcriptional regulators activated uniquely in stimulated B cells from SLE patients.
    PLoS ONE 01/2013; 8(8):e71397. · 3.53 Impact Factor
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    ABSTRACT: The sensing of viral nucleic acids by the innate immune system triggers the production of type I interferons, which activates interferon-stimulated genes (ISGs) and directs a multifaceted antiviral response. ISGs can also be activated through interferon-independent pathways, although the precise mechanisms remain elusive. Here we found that the cytosolic exonuclease Trex1 regulated the activation of a subset of ISGs independently of interferon. Both Trex1(-/-) mouse cells and Trex1-mutant human cells had high expression of genes encoding antiviral molecules ('antiviral genes') and were refractory to viral infection. The interferon-independent activation of antiviral genes in Trex1(-/-) cells required the adaptor STING, the kinase TBK1 and the transcription factors IRF3 and IRF7. We also found that Trex1-deficient cells had an expanded lysosomal compartment, altered subcellular localization of the transcription factor TFEB and diminished activity of the regulator mTORC1. Together our data identify Trex1 as a regulator of lysosomal biogenesis and interferon-independent activation of antiviral genes and show that dysregulation of lysosomes can elicit innate immune responses.
    Nature Immunology 11/2012; · 26.20 Impact Factor
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    ABSTRACT: Background: Respiratory syncytial virus (RSV) is the major respiratory pathogen of infants and young children. Like other RNA viruses, RSV genome replication is prone to errors that results in a heterogeneous population of viral strains some of which may possess differences in pathogenesis and virulence. We sought to determine whether clinical isolates of RSV differ in their capacity to induce inflammatory cytokines and gene expression during infection of human pulmonary epithelial cells and primary human macrophages. Methods: Plaque purified clinical isolates of RSV were used to infect human pulmonary epithelial A549 cells and primary human macrophages from a variety of donors. Concentrations of secreted cytokines were determined by Bio-Plex assay. The transcriptome of infected cells were determined utilizing RNA-SEQ technology. Results: Two RSV subgroup B isolates, NH1067 and NH1125, were identified that differed in their capacity to induce cytokines during infection of A549 cells. Specifically, the level of induction of both IL-6 and RANTES by NH1125 was statistically significantly greater compared to NH1067. The distinct cytokine induction phenotype of the viruses was recapitulated in primary human macrophages. Overall, the level of cytokine induction by NH1125 was greater than NH1067 for all donors tested. Several other subgroup B isolates were identified that had phenotypes that were similar to either NH1125 or NH1067. Transcriptome analyses of infected A549 cells infected with either NH1067 or NH1125 revealed differential RNA expression profiles further supporting the hypothesis that the 2 viruses are phenotypically distinct in their ability to stimulate the innate immune response in A549 cells. Signaling pathway analyses revealed that the magnitude of pathway activation, rather than the specific pathways activated accounted for the differences in gene expression between the 2 viruses. Conclusion: These data suggest that RSV strains are not homogeneous with regard to pathogenesis or virulence. Identification of the viral genetic polymorphisms associated with cytokine induction may lead to the development of effective antiviral agents and vaccines.
    IDWeek 2012 Meeting of the Infectious Diseases Society of America; 10/2012
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    ABSTRACT: Sle1c is a sublocus of the NZM2410-derived Sle1 major lupus susceptibility locus. We have shown previously that Sle1c contributes to lupus pathogenesis by conferring increased CD4(+) T cell activation and increased susceptibility to chronic graft-versus-host disease (cGVHD), which mapped to the centromeric portion of the locus. In this study, we have refined the centromeric sublocus to a 675-kb interval, termed Sle1c2. Mice from recombinant congenic strains expressing Sle1c2 exhibited increased CD4(+) T cell intrinsic activation and cGVHD susceptibility, similar to mice with the parental Sle1c. In addition, B6.Sle1c2 mice displayed a robust expansion of IFN-γ-expressing T cells. NZB complementation studies showed that Sle1c2 expression exacerbated B cell activation, autoantibody production, and renal pathology, verifying that Sle1c2 contributes to lupus pathogenesis. The Sle1c2 interval contains two genes, only one of which, Esrrg, is expressed in T cells. B6.Sle1c2 CD4(+) T cells expressed less Esrrg than B6 CD4(+) T cells, and Esrrg expression was correlated negatively with CD4(+) T cell activation. Esrrg encodes an orphan nuclear receptor that regulates oxidative metabolism and mitochondrial functions. In accordance with reduced Esrrg expression, B6.Sle1c2 CD4(+) T cells present reduced mitochondrial mass and altered mitochondrial functions as well as altered metabolic pathway utilization when compared with B6 CD4(+) T cells. Taken together, we propose Esrrg as a novel lupus susceptibility gene regulating CD4(+) T cell function through their mitochondrial metabolism.
    The Journal of Immunology 06/2012; 189(2):793-803. · 5.52 Impact Factor
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    ABSTRACT: Patients with 22q11.2 deletion syndrome present with heterogeneous clinical phenotypes. The syndrome arises from hemizygous deletions on chromosome 22q11.2, which comprises 60 genes, one is a microRNA binding protein termed DiGeorge Syndrome Critical Region 8, and 4 microRNAs. To determine the impact of this deletion on microRNA expression, we profiled microRNAs in peripheral blood from 31 patients with 22q11.2 deletion and 22 controls. Out of 600 microRNAs analyzed, 13 were differentially expressed in patients, and both a unique hypervariable expression and an abnormal clustering of microRNAs was noted. Selected microRNA groups could distinguish patients who had low numbers of circulating T cells from both normal controls and patients with normal T-cell numbers. The clinical triad of hypocalcemia, congenital heart disease and low circulating T cells was associated with a unique profile of microRNAs. In summary, microRNA profiling of patients with DiGeorge are revealing unique microRNA expression patterns and suggesting gene targets that may become relevant to understanding the molecular basis for clinical phenotypes and T cell development.
    2012 Clinical Immunology Society Annual Meeting; 05/2012
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    ABSTRACT: Sle1a.1 is part of the Sle1 susceptibility locus, which has the strongest association with lupus nephritis in the NZM2410 mouse model. In this study, we show that Sle1a.1 results in the production of activated and autoreactive CD4(+) T cells. Additionally, Sle1a.1 expression reduces the peripheral regulatory T cell pool, as well as induces a defective response of CD4(+) T cells to the retinoic acid expansion of TGF-β-induced regulatory T cells. At the molecular level, Sle1a.1 corresponds to an increased expression of a novel splice isoform of Pbx1, Pbx1-d. Pbx1-d overexpression is sufficient to induce an activated/inflammatory phenotype in Jurkat T cells and to decrease their apoptotic response to retinoic acid. PBX1-d is expressed more frequently in the CD4(+) T cells from lupus patients than from healthy controls, and its presence correlates with an increased central memory T cell population. These findings indicate that Pbx1 is a novel lupus susceptibility gene that regulates T cell activation and tolerance.
    The Journal of Immunology 12/2011; 188(2):604-14. · 5.52 Impact Factor
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    ABSTRACT: Small-cell lung cancer (SCLC) is a highly malignant carcinoma with poor long-term survival. Effective treatment remains highly demanded. In the present study, we demonstrated that External Qi of Yan Xin Qigong (YXQ-EQ) exerted potent cytotoxic effect towards SCLC cell line NCI-H82 via induction of apoptosis. Global gene expression profiling identified 39 genes whose expression was altered by YXQ-EQ in NCI-82 cells. Among them, semi-quantitative RT-PCR and real-time qPCR analyses confirmed that the gene expression levels of apoptotic proteins death-associated protein kinase 2 and cell death-inducing DFFA-like effector b were upregulated, whereas that of oncoproteins DEK and MYCL1, cell migration-promoting proteins CD24 and integrin-alpha 9, and glycolytic enzyme aldolase A were downregulated. These findings suggest that YXQ-EQ may exert anticancer effect through modulating gene expression in a way that facilitates cancer cell apoptosis while represses proliferation, metastasis, and glucose metabolism.
    Molecular and Cellular Biochemistry 12/2011; 363(1-2):245-55. · 2.33 Impact Factor
  • Clinical Lymphoma, Myeloma and Leukemia 10/2011; 11:S151–S152. · 1.67 Impact Factor
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    ABSTRACT: The failure of chemotherapeutic regimens to eradicate cancers often results from the outgrowth of minor subclones with more dangerous genomic abnormalities or with self-renewing capacity. To explore such intratumor complexities in B-cell chronic lymphocytic leukemia (CLL), we measured B-cell kinetics in vivo by quantifying deuterium ((2)H)-labeled cells as an indicator of a cell that had divided. Separating CLL clones on the basis of reciprocal densities of chemokine (C-X-C motif) receptor 4 (CXCR4) and cluster designation 5 (CD5) revealed that the CXCR4(dim)CD5(bright) (proliferative) fraction contained more (2)H-labeled DNA and hence divided cells than the CXCR4(bright)CD5(dim) (resting) fraction. This enrichment was confirmed by the relative expression of two cell cycle-associated molecules in the same fractions, Ki-67 and minichromosome maintenance protein 6 (MCM6). Comparisons of global gene expression between the CXCR4(dim)CD5(bright) and CXCR4(bright)CD5(dim) fractions indicated higher levels of pro-proliferation and antiapoptotic genes and genes involved in oxidative injury in the proliferative fraction. An extended immunophenotype was also defined, providing a wider range of surface molecules characteristic of each fraction. These intraclonal analyses suggest a model of CLL cell biology in which the leukemic clone contains a spectrum of cells from the proliferative fraction, enriched in recently divided robust cells that are lymphoid tissue emigrants, to the resting fraction enriched in older, less vital cells that need to immigrate to lymphoid tissue or die. The model also suggests several targets preferentially expressed in the two populations amenable for therapeutic attack. Finally, the study lays the groundwork for future analyses that might provide a more robust understanding of the development and clonal evolution of this currently incurable disease.
    Molecular Medicine 09/2011; 17(11-12):1374-82. · 4.47 Impact Factor
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    ABSTRACT: Individual cytokines and groups of cytokines that might represent networks in chronic lymphocytic leukemia (CLL) were analyzed and their prognostic values determined. Serum levels of 23 cytokines were measured in 84 patients and 49 age-matched controls; 17 levels were significantly elevated in patients. Unsupervised hierarchical bicluster analysis identified 3 clusters (CLs) of highly correlated but differentially expressed cytokines: CL1 (CXCL9, CXCL10, CXCL11, CCL3, CCL4, CCL19, IL-5, IL-12, and IFNγ), CL2 (TNFα, IL-6, IL-8, and GM-CSF), and CL3 (IL-1β, IL-2, IL-4, IL-15, IL-17, and IFNα). Combination scores integrating expression of CL1/CL2 or CL1/CL3 strongly correlated (P < .005) with time-to-first-treatment and overall survival (OS), respectively. Patients with the worst course had high CL1 and low CL2 or CL3 levels. Multivariate analysis revealed that CL1/CL2 combination score and immunoglobulin heavy chain variable region mutation status were independent prognostic indicators for time-to-first-treatment, whereas CL1/CL3 combination score and immunoglobulin heavy chain variable region mutation status were independent markers for OS. Thus, we identified groups of cytokines differentially expressed in CLL that are independent prognostic indicators of aggressive disease and OS. These findings indicate the value of multicytokine analyses for prognosis and suggest therapeutic strategies in CLL aimed at reducing CL1 and increasing CL2/CL3 cytokines.
    Blood 09/2011; 118(19):5201-10. · 9.78 Impact Factor
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    Igor M Dozmorov, D Dresser
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    ABSTRACT: As suggested by the well-known gestalt concept the immune system can be regarded as an integrated complex system, the functioning of which cannot be fully characterized by the behavior of its constituent elements. Similar approaches to the immune system in particular and sensory systems in general allows one to discern similarities and differences in the process of distinguishing informative patterns in an otherwise random background, thus initiating an appropriate and adequate response. This may lead to a new interpretation of difficulties in the comprehension of some immunological phenomena.
    International journal of biomedical science: IJBS 09/2011; 6(3):167-175.
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    ABSTRACT: A major virulence factor of Bacillus anthracis is the anthrax Lethal Toxin (LeTx), a bipartite toxin composed of Protective Antigen and Lethal Factor. Systemic administration of LeTx to laboratory animals leads to death associated with vascular leakage and pulmonary edema. In this study, we investigated whether systemic exposure of mice to LeTx would induce gene expression changes associated with vascular/capillary leakage in lung tissue. We observed enhanced susceptibility of A/J mice to death by systemic LeTx administration compared to the C57BL/6 strain. LeTx-induced groups of both up- and down-regulated genes were observed in mouse lungs 6 h after systemic administration of wild type toxin compared to lungs of mice exposed to an inactive mutant form of the toxin. Lungs of the less susceptible C57BL/6 strain showed 80% fewer differentially expressed genes compared to lungs of the more sensitive A/J strain. Expression of genes known to regulate vascular permeability was modulated by LeTx in the lungs of the more susceptible A/J strain. Unexpectedly, the largest set of genes with altered expression was immune specific, characterized by the up-regulation of lymphoid genes and the down-regulation of myeloid genes. Transcripts encoding neutrophil chemoattractants, modulators of tumor regulation and angiogenesis were also differentially expressed in both mouse strains. These studies provide new directions for the investigation of vascular leakage and pulmonary edema induced by anthrax LeTx.
    Toxins 09/2011; 3(9):1111-30. · 2.13 Impact Factor
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    ABSTRACT: In this work we apply the Internal Standard-based analytical approach that we described in an earlier communication and here we demonstrate experimental results on functional associations among the hypervariably-expressed genes (HVE-genes). Our working assumption was that those genetic components, which initiate the disease, involve HVE-genes for which the level of expression is undistinguishable among healthy individuals and individuals with pathology. We show that analysis of the functional associations of the HVE-genes is indeed suitable to revealing disease-specific differences. We show also that another possible exploit of HVE-genes for characterization of pathological alterations is by using multivariate classification methods. This in turn offers important clues on naturally occurring dynamic processes in the organism and is further used for dynamic discrimination of groups of compared samples. We conclude that our approach can uncover principally new collective differences that cannot be discerned by individual gene analysis.
    Nucleic Acids Research 06/2011; 39(18):7881-99. · 8.81 Impact Factor
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    ABSTRACT: Sle2c1 is an NZM2410- and NZB-derived lupus susceptibility locus that induces an expansion of the B1a cell compartment. B1a cells have a repertoire enriched for autoreactivity, and an expansion of this B cell subset occurs in several mouse models of lupus. A combination of genetic mapping and candidate gene analysis presents Cdkn2c, a gene encoding for cyclin-dependent kinase inhibitor p18(INK4c) (p18), as the top candidate gene for inducing the Slec2c1-associated expansion of B1a cells. A novel single nucleotide polymorphism in the NZB allele of the Cdkn2c promoter is associated with a significantly reduced Cdkn2c expression in the splenic B cells and peritoneal cavity B1a cells from Sle2c1-carrying mice, which leads to a defective G1 cell cycle arrest in splenic B cells and increased proliferation of peritoneal cavity B1a cells. As the cell cycle is differentially regulated in B1a and B2 cells, these results suggest that Cdkn2c plays a critical role in B1a cell self-renewal and that its impaired expression leads to an accumulation of these cells with high autoreactive potential.
    The Journal of Immunology 06/2011; 186(12):6673-82. · 5.52 Impact Factor
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    ABSTRACT: Serum cytokines play an important role in the pathogenesis of myositis by initiating and perpetuating various cellular and humoral autoimmune processes. The aim of the present study was to describe a broad spectrum of T- and B-cell cytokines, growth factors and chemokines in patients with idiopathic inflammatory myopathies (IIMs) and healthy individuals. A protein array system, denoted as multiplex cytokine assay was utilized to measure simultaneously the levels of 24 circulating cytokines, including B-cell activating factor (BAFF) and a proliferation inducing ligand (APRIL) of patients with IIMs and healthy individuals. Additionally, correlational clustering and discriminant function analysis (DFA), two multivariate, supervised analysis methods were employed to identify a subset of biomarkers in order to describe potential functional interrelationships among these pathological cytokines. Univariate analysis demonstrated that a complex set of immune and inflammatory modulating cytokines are significantly up-regulated in patients with IIMs relative to unaffected controls including IL-10, IL-13, IFN-α, epidermal growth factor (EGF), VEGF, fibroblast growth factor (FGF), CCL3 [macrophage inflammatory protein (MIP-1α)], CCL4 (MIP-1β) and CCL11 (eotaxin), whereas G-CSF was significantly reduced in IIM patients. Correlational clustering was able to discriminate between, and hence sub-classify patients with IIMs. DFA identified EGF, IFN-α, VEGF, CCL3 (MIP-1α) and IL-12p40, as analytes with the strongest discriminatory power among various myositis patients and controls. Our findings suggest that these factors modulate myositis pathology and help to identify differences between subsets of the disease.
    Rheumatology (Oxford, England) 10/2010; 49(10):1867-77. · 4.24 Impact Factor

Publication Stats

989 Citations
284.03 Total Impact Points

Institutions

  • 2014
    • University of Texas Southwestern Medical Center
      Dallas, Texas, United States
  • 2012
    • State University of New York
      New York City, New York, United States
  • 2011–2012
    • University of Florida
      • Department of Pathology, Immunology, and Laboratory Medicine
      Gainesville, FL, United States
    • North Florida and South Georgia Veterans Health System
      Gainesville, Florida, United States
  • 2003–2011
    • Oklahoma Medical Research Foundation
      Oklahoma City, Oklahoma, United States
  • 2003–2008
    • University of Oklahoma Health Sciences Center
      • • College of Medicine
      • • Department of Pediatrics
      Oklahoma City, OK, United States
  • 2007
    • University of Bergen
      Bergen, Hordaland, Norway
  • 1995–2002
    • University of Michigan
      • Department of Pathology
      Ann Arbor, MI, United States
  • 1991–1997
    • Pacific Institute of Bioorganic Chemistry
      Wladiwostok, Primorskiy, Russia
    • Russian Academy of Sciences
      Moskva, Moscow, Russia