Browsing by Author "Massardo, L"

Now showing 1 - 8 of 8
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    A population based assessment of the use of orthopedic surgery in patients with rheumatoid arthritis
    (J RHEUMATOL PUBL CO, 2002) Massardo, L; Gabriel, SE; Crowson, CS; O'Fallon, WM; Matteson, EL
    Objective. To describe the use of orthopedic surgery, including joint replacement surgery, in a well defined population based cohort of patients with rheumatoid arthritis (RA) and to identify characteristics that predict such use.
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    Accuracy of anti-ribosomal P protein antibody testing for the diagnosis of neuropsychiatric systemic lupus erythematosus - An international meta-analysis
    (WILEY, 2006) Karassa, FB; Afeltra, A; Ambrozic, A; Chang, DM; De Keyser, F; Doria, A; Galeazzi, M; Hirohata, S; Hoffman, IEA; Inanc, M; Massardo, L; Mathieu, A; Mok, CC; Morozzi, G; Sanna, G; Spindler, AJ; Tzioufas, AG; Yoshio, T; Ioannidis, JPA
    Objective. To quantitatively evaluate the diagnostic accuracy of antibodies to ribosomal P proteins (anti-P) for neuropsychiatric systemic lupus erythematosus (NPSLE) in general, for psychosis, mood disorder, or both, and for other diffuse manifestations.
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    Antibodies against galectin-8 in patients with systemic lupus erythematosus
    (SOC MEDICA SANTIAGO, 2006) Pardo, E; Carcamo, C; Massardo, L; Mezzano, V; Jacobelli, S; Gonzalez, A; Soza, A
    Background: The family of lectins known as galectins (galectins 1-14) are involved in the regulation of the immune system and in oncogenesis. During a search for antigens recognized by antibodies produced by a patient with systemic lupus erythematosus described. Aim: To determine the frequency of autoantibodies against galectin-8 in lupus patients compared with healthy controls. Patients and Methods: Galectin-8 was purified from a bacterial expression system and used in immunoblot assays as antigen to screen the sera of 55 SLE patients and matched controls. Disease activity was evaluated using the Mexican Modification of the Systemic Lupus Erythematosus Disease Activity Index (MEX-SLEDAI). Results: Reactivity against galectin-8 was detected in 30% of SLE patients, compared to 7% ofcontrols (p = 0.003). We could not detect any particular SLE manifestation associated to the pressence of these autoantibodies. Conclusion: This is the first description of autoantibodies against galectin-8. Its higher frequency in a patients with SLE suggests a pathogenic role. Further studies are needed to determine their clinical relevance (Rev Med Chile 2006; 134: 159-66).
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    Circulating platelet-derived microparticles in systemic lupus erythematosus - Association with increased thrombin generation and procoagulant state
    (GEORG THIEME VERLAG KG, 2006) Pereira, J; Alfaro, G; Goycoolea, M; Quiroga, T; Ocqueteau, M; Massardo, L; Perez, C; Saez, C; Panes, O; Matus, V; Mezzano, D
    The risk for thrombosis is significantly increased in systemic lupus erythematosus (SLE), affecting both venous and arterial vessels. Activated platelets are known to participate in thrombus formation and growth. A general feature of activated cells is the shedding of microparticles (MP) which support coagulation by exposure of negatively charged phospholipids and possibly tissue factor (TF). In this work we characterized circulating MP in patients with SLE and their relationship with a procoagulant state. Thirty patients with SLE (aged 15-72 years, mean age 38 years) and 20 healthy controls (aged 22-54 years, mean age 34 years) were studied; patients fulfilled 4 revised criteria for SLE. The number and cellular source of circulating MP were determined by flow cytometry using double labeling with specific monoclonal antibodies and annexin V. Thrombin generation was measured as the endogenous thrombin potential (ETP) without the addition of exogenous phospholipids and TF; under these conditions the generation of thrombin depended directly on the number of MP present in plasma. Thrombin anti-thrombin (TAT) and plasmin-antiplasmin (PAP) complexes were measured by ELISA. Compared to the controls, circulating MP were significantly elevated in the patient group (1218 +/- 136 vs 653 +/- 74 x 10(3)/ml plasma, p: 0.0007). In both groups, most of these MP were of platelet origin (927 +/- 131 vs 517 +/- 72 x 10(3)/ml plasma, p:0.009). ETP was higher among patients as compared to the controls (804 +/- 64 vs 631 +/- 37 nM thrombin, p: 0.025). Plasma levels of TAT in patients and controls were 3.4 +/- 0.8 and 1.4 +/- 0.5 mu g/L, respectively (p:0.04), and of PAP complexes were 62.5 +/- 14 and 24.05 +/- 2.5 mu g/ml, respectively (p:0.014). The number of platelet-derived MP correlated significantly with thrombin generation (r: 0.42; p: 0.038) and TAT levels (r: 0.40; p: 0.035). We did not find an association of circulating MP with disease activity nor with the presence of antiphospholipid antibodies. The increased number of circulating platelet-derived microparticles and their association with high ETP and activation of the coagulation system suggest that these microparticles play an important role in the pathogenesis of the prothrombotic state in SLE patients.
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    Familial aggregation of systemic lupus erythematosus, rheumatoid arthritis, and other autoimmune diseases in 1,177 lupus patients from the GLADEL cohort
    (WILEY, 2005) Alarcon Segovia, D; Alarcon Riquelme, ME; Cardiel, MH; Caeiro, F; Massardo, L; Villa, AR; Pons Estel, BA; GLADEL
    Objective. To determine whether there is familial aggregation of systemic lupus erythematosus (SLE) and/or other autoimmune diseases in SLE patients and to identify clinical differences between patients with and those without familial autoimmunity.
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    Galectin-8 binds specific beta 1 integrins and induces polarized spreading highlighted by asymmetric lamellipodia in Jurkat T cells
    (ELSEVIER INC, 2006) Carcamo, C; Pardo, E; Oyanadel, C; Bravo Zehnder, M; Bull, P; Caceres, M; Martinez, J; Massardo, L; Jacobelli, S; Gonzalez, A; Soza, A
    Integrin-mediated encounters of T cells with extracellular cues lead these cells to adhere to a variety of substrates and acquire a spread phenotype needed for their tissue incursions. We studied the effects of galectin-8 (Gal-8), beta-galactoside binding lectin, on Jurkat T cells. Immobilized Gal-8 bound alpha 1 beta 1 and alpha 5 beta 1 but not alpha 2 beta 1 and alpha 4 beta 1 and adhered these cells with similar kinetics to immobilized fibronectin (FN). Function-blocking experiments with monoclonal anti-integrin antibodies suggested that alpha 5 beta 1 is the main mediator of cell adhesion to this lectin. Gal-8, but not FN, induced extensive cell spreading frequently leading to a polarized phenotype characterized by an asymmetric lamellipodial protrusion. These morphological changes involved actin cytoskeletal rearrangements controlled by PI3K, Rac-1 and ERK1/2 activity. Gal-8-induced Rac-1 activation and binding to alpha 1 and alpha 5 integrins have not been described in any other cellular system. Strikingly, Gal-8 was also a strong stimulus on Jurkat cells in suspension, triggering ERK1/2 activation that in most adherent cells is instead dependent on cell attachment. In addition, we found that patients with systemic lupus erythematosus (SLE), a prototypic autoimmune disorder, produce Gal-8 autoantibodies that impede both its binding to integrins and cell adhesion. These are the first function-blocking autoantibodies reported for a member of the galectin family. These results indicate that Gal-8 constitutes a novel extracellular stimulus for T cells, able to bind specific beta 1 integrins and to trigger signaling pathways conducive to cell spreading. Gal-8 could modulate a wide range of T cell-driven immune processes that eventually become altered in autoimmune disorders. (C) 2005 Elsevier Inc. All rights reserved.
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    Long-Term outcome of type V lupus membranous glomerulonephritis
    (SOC MEDICA SANTIAGO, 2005) Pasten, R; Massardo, L; Rosenberg, H; Radrigan, F; Roessler, E; Valdivieso, A; Jacobelli, S
    Background: The long-term outcome of the pure form of WHO type V lupus membranous glomerulonephritis is apparently more benign than that of other forms of lupus glomerulonepbritis. However 12% of such patients progress to terminal renal failure. The presence of proteinuria may be an indication of cytotoxic agents. Aim: To study the clinical long-term outcome of WHO type V Inpus membranous glomerulonepbritis. Material and methods: A retrospective analysis of all kidney biopsies of a University Pathology Department, with the diagnosis of WHO type V lupus membranous glomerulonephritis. Review of medical records of patients with the disease and one clinical assessment of all living patients. Results: Between 1973 and 2000, 703 kidney biopsies were done to patients with systemic lupus erytbematosus. Of these, 40 were membranous glomerulonepbritis and in 33 patients (28 women, age range 6-71 years), data on the evolution and survival was obtained. Nineteen bad type Va and the rest type Vb nephritis. Two presented with renal failure and I I with proteinuria over 3.5 g/24h. The median follow-up since the renal biopsy was 63 months (range 1-316). At the end of follow-up, four bad a creatinine clearance of less then 15 ml/h and four a clearance between 15 and 29 ml/h (one of these received a renal allograft). Eleven (33016) patients had died, mostly due to infections. Life expectancy at five years with a creatinine clearance over 15 ml/h was 75%. Bad prognostic factors were an elevated creatinine clearance over 15 ml/h was 75%. Bad prognostic factors were an elevated creatinine and high blood pressure at the moment of the biopsy. Conclusions: The clinical outcome of these patients was bad. Twelve percent reached a stage of terminal renal failure. This is in contrast with the 3% progression to a similar stage of proliferalive glomerulonephritis treated with the 3% cycloposphamide. New tberapies for this condition must be sought.
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    The presence of the HLA-DRB1 shared epitope correlates with erosive disease in Chilean patients with rheumatoid arthritis
    (OXFORD UNIV PRESS, 2002) Massardo, L; Gareca, N; Cartes, MA; Cervilla, V; Gonzalez, A; Jacobelli, S
    Objective. To assess the contribution of the HLA-DRB1 shared epitope (SE) to the radiological outcome of rheumatoid arthritis (RA) after 6 yr of follow-up in a reported series of 129 Chilean patients with established disease.