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SIGMAFAST OPD

SIGMAFAST OPD

Company: Sigma-Aldrich
Catalog#: P9187
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Extraction and Identification of T Cell Stimulatory Self-lipid Antigens
Author:
Date:
2015-06-05
[Abstract]  Autoreactive T cells restricted to CD1 molecules and specific for endogenous lipids are abundant in human blood (de Jong et al., 2010; de Lalla et al., 2011). A few self-lipid molecules recognized by diverse individual T cell clones and accumulated within APCs following stress signals or cell transformation have been identified so far (de Jong et al., 2010; Chang et al., 2008; Lepore et al., 2014). These findings suggested that auto-reactive CD1-restricted T cells display broad lipid specificities and may play critical roles in different types of immune responses including cancer immune surveillance, autoimmunity and antimicrobial immunity. Therefore, the identification of the repertoire of self-lipid molecules recognized by T cells is ... [摘要]  限于CD1分子并且对内源性脂质特异的自身反应性T细胞在人血液中是丰富的(de Jong等人,2010; de Lalla等人,2011)。迄今已经鉴定了多种单个T细胞克隆识别并在应激信号或细胞转化后在APC内积累的一些自身脂质分子(de Jong等人,2010; Chang等人。,2008; Lepore ,2014)。这些研究结果表明自反应CD1限制性T细胞显示广泛的脂质特异性,可能在不同类型的免疫反应,包括癌症免疫监视,自身免疫和抗微生物免疫中发挥关键作用。因此,鉴定由T细胞识别的自身脂质分子的所有组成成分对于研究该T细胞群的生理功能和评估其治疗潜力是重要的(Lepore等人,2014)。这里我们描述了我们建立的用于分离和鉴定源自白血病细胞的内源性脂质的方案,其刺激特异性自身反应性CD1c限制性T淋巴细胞(Lepore等人,2014)。该方案可以应用于从任何类型的靶细胞分离脂质抗原,并研究限制于所有CD1同种型的自身反应性T细胞的自身脂质抗原特异性(Facciotti等人,2012)。

Competitive ELISA for Protein-lipopolysaccharide (LPS) Binding
Author:
Date:
2014-11-20
[Abstract]  Lipopolysaccharide is the major constituent of the outer membrane of gram-negative bacteria and, once released from the bacterial surface into the bloodstream, is a potent activator of the host immune system, which can lead to septic shock. LPS has a hydrophilic region consisting of a repeating oligosaccharide that is strain-specific (O-antigen) and a core polysaccharide, which is covalently linked to a hydrophobic lipid moiety (lipid A). Lipid A is the most conserved part and is responsible for the toxicity of LPS. Therefore, finding molecules able to bind to this region and neutralize LPS toxicity is of relevant interest as it may provide new therapies to prevent septic shock (Chen et al., 2006). Several proteins and peptides were reported to bind LPS and alter its toxicity ... [摘要]  脂多糖是革兰氏阴性细菌外膜的主要成分,一旦从细菌表面释放到血液中,是宿主免疫系统的有效激活剂,可导致败血性休克。 LPS具有由与疏水性脂质部分(脂质A)共价连接的作为菌株特异性(O-抗原)的重复寡糖和核心多糖组成的亲水性区域。脂质A是最保守的部分,负责LPS的毒性。因此,寻找能够结合该区域并中和LPS毒性的分子是有兴趣的,因为它可能提供新的治疗方法来预防败血性休克(Chen et al。,2006)。报道了几种蛋白质和肽结合LPS并改变其对还原和甚至增强的毒性(Brandenburg等,1998),例如血清白蛋白(Ohno和Morrison,1989),脂多糖结合蛋白(LBP)(de Haas等人,1999),酪蛋白(López-Expósito等,2008),溶菌酶,抗生素多粘菌素B和抗菌肽(Chen等,2006)。虽然这些蛋白质中的一些是中性的,甚至阴离子/酸性(pI <7)(jang et="" al。,2009),由于lps的两亲性结构和脂质a上带负电荷的磷酸酯基团的存在是最重要的因素被认为与lps最佳结合的是阳离子/碱性(pi=""> ...

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