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Autoimmune Etiology (autoimmune + etiology)
Selected AbstractsMorvan's syndrome: Clinical, laboratory, and in vitro electrophysiological studiesMUSCLE AND NERVE, Issue 2 2004Wolfgang N. Löscher MD Abstract Morvan's syndrome is a rare disorder characterized by neuromyotonia, hyperhidrosis, and central nervous system dysfunction. We report a patient with features of this syndrome, but who initially presented with breathing difficulties. Concentric needle electromyography showed an abundance of myokymic and neuromyotonic discharges. Exercise tests and repetitive nerve stimulation showed a decrement,increment response of compound muscle action potentials. Antibodies against voltage-gated potassium channels were not detected on repeated testing, but the presence of oligoclonal bands in the cerebrospinal fluid (CSF) suggested an autoimmune etiology. At follow-up over 3 years, no cancer was found. Electrophysiological in vitro studies of effects of patient serum and CSF on rat nerves provided no evidence of altered voltage-gated sodium or potassium conductances. We conclude that putative humoral factors do not block ion channels acutely but may cause channel dysfunction with chronic exposure. Muscle Nerve 30: 157,163, 2004 [source] Autoimmune cytopenia does not predict poor prognosis in chronic lymphocytic leukemia/small lymphocytic lymphoma,AMERICAN JOURNAL OF HEMATOLOGY, Issue 1 2003Mouhammed J. Kyasa Abstract Chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) is characterized by an acquired immune defect that can cause autoimmune complications, including anemia and thrombocytopenia. We conducted an observational study of the epidemiology, clinical presentation and significance of autoimmune complications of CLL/SLL in 132 patients from a large population (>45,000 veterans), in which at least 90% of patients with CLL/SLL have been previously identified. Over a period of 12.5 years, 12 patients (9.1%) had autoimmune complications; of these, 6 (4.5%) had autoimmune hemolytic anemia (AIHA), 5 (3.8%) had immune thrombocytopenia (ITP), and 1 (0.8%) had pure red blood cell aplasia (PRBA). All 6 cases of AIHA had a positive direct immunoglobulin test for IgG and C3d. In 6 patients, CLL/SLL was an incidental finding at the time of presentation with autoimmune cytopenia. Nine out of 10 patients responded to immunosuppressive therapy, which was complicated by serious infection in 7 cases, one of which was fatal. The major cause of mortality in patients with autoimmune complications of CLL/SLL was secondary malignancy. Survival of patients with immune cytopenia was not significantly different from CLL/SLL patients without immune cytopenia. Among patients with anemia or thrombocytopenia, mortality was significantly higher in those with bone marrow failure compared to an autoimmune etiology. We show that in a non-referred population with a high incidence of CLL/SLL, autoimmune cytopenia can occur early in the natural history of the disease. These data suggest that the Rai and Binet classifications for CLL need to be modified for patients with autoimmune cytopenia. Am. J. Hematol. 74:1,8, 2003. Published 2003 Wiley-Liss, Inc. [source] REVIEW ARTICLE: Immunological Modes of Pregnancy LossAMERICAN JOURNAL OF REPRODUCTIVE IMMUNOLOGY, Issue 6 2010Joanne Kwak-Kim Citation Kwak-Kim J, Park JC, Ahn HK, Kim JW, Gilman-Sachs A. Immunological modes of pregnancy loss. Am J Reprod Immunol 2010 During the implantation period, a significant portion of embryos are lost and eventually less than half of clinically established pregnancies end as full-term pregnancies without obstetrical complications. A significant portion of these pregnancy losses is associated with immune etiologies, including autoimmune and cellular immune abnormalities. Although an autoimmune etiology such as anti-phospholipid antibodies (APAs) has been reported to induce placental infarct and thrombosis at maternal,fetal interface, APAs induce inflammatory immune responses as well. Inflammatory immune responses, such as increased proportions of NK cells and Th1/Th2 cell ratios in peripheral blood are related to recurrent pregnancy losses and multiple implantation failures. Systemic and local inflammatory immune responses seem to be induced by activation of Toll-like receptors with infectious agents, fetal cell debris, or gonadotropin-releasing hormone agonist, etc. Cellular activation of T and NK cells leads to pro-inflammatory cytokine storm and consequently, placental infarction and thrombosis. Potential application of anti-inflammatory therapeutic agents for the prevention of pregnancy losses should be explored further. [source] Identification of HLA-DRB1*1501-restricted T-cell epitopes from human prostatic acid phosphataseTHE PROSTATE, Issue 10 2007Elena N. Klyushnenkova Abstract BACKGROUND The crucial role of CD4 T-cells in anti-tumor immune response is widely recognized, yet the identification of HLA class II-restricted epitopes derived from tumor antigens has lagged behind compared to class I epitopes. This is particularly true for prostate cancer. Based on the hypothesis that successful cancer immunotherapy will likely resemble autoimmunity, we searched for the CD4 T-cell epitopes derived from prostatic proteins that are restricted by human leukocyte antigen (HLA)-DRB1*1501, an allele associated with granulomatous prostatitis (GP), a disease that may have an autoimmune etiology. One of the antigens implicated in the development of autoimmunity in the prostate is prostatic acid phosphatase (PAP), which is also considered a promising target for prostate cancer immunotherapy. METHODS We immunized transgenic (tg) mice engineered to express HLA-DRB1*1501 with human PAP. A library of overlapping 20-mer peptides spanning the entire human PAP sequence was screened in vitro for T-cell recognition by proliferative and interferon (IFN)-, enzyme-linked immunosorbent spot (ELISPOT) assays. RESULTS We identified two 20-mer peptides, PAP (133,152), and PAP (173,192), that were immunogenic and naturally processed from whole PAP in HLA-DRB1*1501 tg mice. These peptides were also capable of stimulating CD4 T lymphocytes from HLA-DRB1*1501 -positive patients with GP and normal donors. CONCLUSIONS These peptides can be used for the design of a new generation of peptide-based vaccines against prostate cancer. The study can also be helpful in understanding the role of autoimmunity in the development of some forms of chronic prostatitis. Prostate 67: 1019,1028, 2007. © 2007 Wiley-Liss, Inc. [source] Association of the autoimmunity locus 4q27 with juvenile idiopathic arthritisARTHRITIS & RHEUMATISM, Issue 3 2009H. M. Albers Objective Juvenile idiopathic arthritis (JIA) is characterized by chronic arthritis and an autoimmune etiology. In several autoimmune diseases, including rheumatoid arthritis (RA), an association with the 4q27 locus has been reported. We undertook this study to investigate the possible role of the 4q27 locus in JIA. Methods A case,control association study was conducted, with a total of 655 Caucasian JIA patients and 791 healthy controls divided into 2 independent sample sets. The rs6822844 marker in the 4q27 locus was genotyped. Results In the first and larger sample set, a 5% decrease in T allele frequency was observed in patients compared with controls (allelic odds ratio [OR] 0.72 [95% confidence interval 0.55,0.95], P = 0.019), and in the second set, a 3% decrease was observed (allelic OR 0.81 [95% confidence interval 0.61,1.09], P = 0.169). The combined data set generated an OR of 0.76 (95% confidence interval 0.62,0.93, P = 7.08 × 10,3). When the different JIA subtypes were analyzed individually, significant decreases were seen in the subtypes with a polyarticular course of disease (extended oligoarthritis [P = 0.019] and rheumatoid factor,negative polyarthritis [P = 0.038]). Conclusion Our findings suggest that the 4q27 locus, previously reported to be associated with RA, type 1 diabetes mellitus, celiac disease, and psoriatic arthritis, is also associated with susceptibility to JIA. [source] | ||||||||||