379 research outputs found
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ãéçºããELISAå€æ³ãçšããããã®çµæãInterleukin(IL)-12 p70æäœã¯MGå䜵ã®æç¡ã«ãããããèžè
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ãã¹ã¯ãªãŒãã³ã°ããããšã«ãããMGã¯åã«AChRæäœã«ãããç¥çµçæ¥åéšã®ã·ããã¹äŒéé害ãèµ·ããç
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«å䜵äŸ)ã¯ããã«E-C couplingãåæã«é害ããããšã«ããéªšæ Œçãåçž®ããé害ããçŸæ£ã§ããå¯èœæ§ãé«ããªã£ããããªãã¡ãMGã®çåäœäžãæç²åŽæ§ã¯ç¥çµçäŒéé害ã®ã¿ãªããçåçž®ã®é害ãé¢äžããŠããå¯èœæ§ã瀺ããããMyasthenia gravis (MG) is thought to be a disorder targeting at the acetylcholine receptor (AChR) on postsynaptic membrane of neuromuscular junction (NMJ). One of clinical characteristics of MG is high prevalence of thymic abnormality as high as 90% of patients. About 80% of patients have thymic follicular hyperplasia and 20% have thymoma. The patients with thymoma are refractory to therapy, i.e., they need to receive high amount of steroid for treatment. We measured AChR antibody, cytokines and antibodies against cytokines for studying the autoimmunity of MG patients with thymoma. For measurement of AChR antibodies, we used immunoprecipitation method. For measurement of cytokines, enzyme-linked immunosorbent assay (ELISA) was applied. For measurement of antibodies against cytokines, the modified ELISA was utilized. As a result, antibodies against interleukin (IL)-12 p70 were high in patients with thymoma with or without MG. IL-12 p40 and anti-IL-12 p40 antibodies elevated in sera from MG patients with thymoma. Additionally, we developed assay system for detecting antibodies against ryanodine receptor (RyR) that have a role in excitation-contraction (E-C) coupling of skeletal muscle. The method use whole protein of RyR instead to synthetic peptide, and is more sensitive and specific than ELISA system using synthetic peptide. Using detection system for RyR antibodies, we found that a group of MG patients with thymoma have autoantibodies against both AChR and RyR. Therefore, the pathological targets of MG patients with thymoma are synaptic transmission (AChR) and E-C coupling (RyR).ç 究課é¡/é åçªå·:16590818, ç 究æé(幎床):2004-2006åºå
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ããããèšåºè©Šéšã®çµæããã®æå¹æ§ã蚌æãããçŸåšãã¿ã¯ããªã ã¹ã¯é£æ²»æ§MGã«å¯Ÿããæ²»çè¬ãšããŠèšåºã§äœ¿ãããããã«ãªã£ããã¿ã¯ããªã ã¹ã¯ããããŸã§ã®å
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ã«ã«ã·ãŠã æ¿åºŠ[Ca^]_iã枬å®ããããšã«ãããã¿ã¯ããªã ã¹ã¯ã¢ã»ãã«ã³ãªã³æ·»å ã«ããã²ãããããã[Ca^]_iãå¢åŒ·ãããããšãããããéªšæ Œçã®è奮åçž®é£é¢ã«çŽæ¥çã«åãããšã瀺åããããWe evaluated anti-acetylcholine receptor antibody (AChRAb) and IgG productions from thymus cells, bone marrow, and peripheral blood mononuclear cells(PBMC) in patients with myasthenia gravis(MG). PBMC from MG patients spontaneously produced more abundant IgG than that from normal controls. PBMC of MG patients had an accelerated ability to produce immunoglobulin compared to that of thymus or bone marrow cells. Severe combined immunodeficiency(SCID) mice do not have functional T or B cells, and injected human lymphocytes can reconstitute a functional human immune system in the mice. We produced MG-SCID mice by injecting thymus cells and PBMC into the peritoneal cavity of the mice. One hundred days after cell transplantation, we injected acetylcholine receptor protein into the peritoneal cavity of the mice. We observed a sharp elevation of human AChRAb titer after the antigen administration suggesting a memory immune response of human lymphocytes. In a study to clarify factors that induce immunoglobulin production by cultured PBMC, we observed that interleukin (IL)-5 and IL-6 secretions are correlated with IgG production. As a result, immunotherapy targeting PBMC from MG patients seems to be effective. A clinical trial of tacrolimus proved to be effective for intractable MG patients. Currently, the usage of tacrolimus is admitted as an immunotherapy for intractable MG patients. As tacrolimus showed quick therapeutic effect compared to other immunosuppressants, pharmacological effects in addition to immunosuppression are suspected. We measured intracellular Ca^ level ([Ca^]_i) in cultured skeletal muscle cell line (TE671). Tacrolimus increased [Ca^]_i induced by the addition of acetylcholine. Therefore, tacrolimus may have an effect on the excitation-contraction coupling as well as immunosuppressive effects.ç 究課é¡/é åçªå·:13670636, ç 究æé(幎床):2001-2003åºå
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A dataset of molluscan fauna sampled in river estuaries of medium and small size river in Kyushu island, Japan
Many studies have evaluated the ecological integrity of large-scale estuaries of continental rivers using biotic indicators such as fish, phytoplankton and benthic communities. However, few studies have focused on the river estuaries of small and medium rivers. Molluscan fauna data in large estuaries or in the estuaries of large rivers have been collected by the The National Census on River Environments (conducted by the Ministry of Land, Infrastructure, Transport and Tourism) or National Survey on the Natural Environment (conducted by the Ministry of Environment). On the other hand, molluscan fauna of small and medium rivers are managed by local governments and have rarely been investigated.
This paper provides basic information on the molluscan fauna of 70 rivers in Kyushu, Japan, collected with the aim of conserving estuaries of small and medium rivers. In total, 37 families, 82 species and 21,827 individuals were collected. The data are all accessible from the document "A dataset of shellfish fauna sampled in estuaries of medium and small rivers in Kyushu, Japan (http://ipt.pensoft.net/resource.do?r=shellfishes_in_kyushu)". According to the Red Data Book published by the Japanese Ministry of Environment in 2018, 3 species were determined as Critically endangered and Endangered, 6 species were determined as Vulnerable and 13 species were determined as Near Threatened. The proportions of individuals classified as Critically endangered and Endangered from the total number of individuals were extremely low, but the proportions of Near Threatened individuals were high. Our results indicate that the risk of molluscan extinction in small- and medium-sized river estuaries in Kyushu is high and that immediate conservation is necessary
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ç«æå¶å€ã§ããFK506ããã¢ã»ãã«ã³ãªã³å容äœÎ±ãµããŠãããæ®åºçªå·125-147ã«çžåœããåæãããã(Hα125-147)ã§å
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ã¯ãHα129-145ãæå°ã®ãšãããŒãã§ããããšãæããã«ããããã®ããããã®137çªã®ãã§ãã«ã¢ã©ãã³ãã¢ã©ãã³ã§çœ®æããã¢ããã°ããããã¯ããã€ãŒããããããšåæ§ã«MHC class IIã«çµåãããT现èã掻æ§åãããããšãã§ããªãããã®ãããT现èå容äœã®ã¢ã³ã¿ãŽãã¹ããšèããããæ²»çæ段ãšããŠäœ¿ããå¯èœæ§ãããã4.éççç¡åçæ£è
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ã«ãããŠãåæ§ã§ãã£ããæ«æ¢¢è¡åæ žçã®æäœç£çèœã®ã¢ãã¿ãŒã¯éççç¡åçã®çŸæ£æŽ»åæ§ã®è©äŸ¡ã«æçšã§ãããšæãããã1. T cell-specific immunosuppressive agent ; FK506 prevents induction of rat experimental autoimmune myasthenia gravis (EAMG) evoked by immunizing T cells against the synthetic peptide which corresponds to human acetylcholine receptor (AChR) α-subunit residues 125-147 (Hα125-147).2. The thymus in a majority of patients with acquired myasthenia gravis (MG) is the principal but not the sole reservoir of immunocytes that specifically react with muscle antigens.3. The α-subunit segment 125-147 (Nα125-147) of the nicotinic acetylcholine receptor of human skeletal muscle (AChR) is stimulatory for lymph node T cells of immunized Lewis rats, and induces autoantibody production and clinical and electrophysiological signs of EAMG.The goal of this study was to identify and modify in this autoantigen the minimal epitope (s) necessary for helper T cell activation and disease induction. We identified Hα129-145 as a minimum epitope. The analog peptide with alanine substituted for phenylalanine 137 may have therapeutic potential because it is equivalent to the native peptide in its binding to MHC class II, but fails to stimulate a T cell proliferative response, and is therefore a candidate T cell receptor antagonist.4. Thymocytes form MG patients were transferred into the peritoneal cavities of severe combined immunodeficiency (SCID) mice, which caused the mice to produce human IgG and IgM.The injected thymocytes were then recovered from the peritoneal cavities of MG-SCID mice. The functional human T and B cells survived in the SCID mice for a long period.5. Peripheral blood mononuclear cells (PBMC) from MG patients is the most efficient site at producing AChRAb amongst thymocytes, bone marrow (BM) cells and PBMC, even in patients of short duration (equal to, or less than, 2 months). Monitoring AChRAb secretion by PBMC is useful to estimate the autoimmune activity of MG.ç 究課é¡/é åçªå·:09670647, ç 究æé(幎床):1997-2000åºå
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Behavior of vascular resistance undergoing various pressure insufflation and perfusion on decellularized lungs
Bioengineering of functional lung tissue by using whole lung scaffolds has been proposed as a potential alternative for patients awaiting lung transplant. Previous studies have demonstrated that vascular resistance (Rv) could be altered to optimize the process of obtaining suitable lung scaffolds. Therefore, this work was aimed at determining how lung inflation (tracheal pressure) and perfusion (pulmonary arterial pressure) affect vascular resistance. This study was carried out using the lungs excised from 5 healthy male Sprague-Dawley rats. The trachea was cannulated and connected to a continuous positive airway pressure (CPAP) device to provide a tracheal pressure ranging from 0 to 15 cmH(2)O. The pulmonary artery was cannulated and connected to a controlled perfusion system with continuous pressure (gravimetric level) ranging from 5 to 30 cmH(2)O. Effective Rv was calculated by ratio of pulmonary artery pressure (P-PA) by pulmonary artery flow (V'(PA)). Rv in the decellularized lungs scaffolds decreased at increasing V'(PA), stabilizing at a pulmonary arterial pressure greater than 20 cmH(2)O. On the other hand, CPAP had no influence on vascular resistance in the lung scaffolds after being subjected to pulmonary artery pressure of 5 cmH(2)O. In conclusion, compared to positive airway pressure, arterial lung pressure markedly influences the mechanics of vascular resistance in decellularized lungs. (C) 2016 Elsevier Ltd. All rights reserved
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