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Ant?-genos MICA y trasplante

机译:云母蚂蚁?-生殖和移植

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摘要

Human leukocyte antigens (HLA), encoded by major histocompatibility complex (MHC) genes, act as inducers of immune responses in transplantation. However, the products of the genes related to MHC class I chains (MIC) are also one of the targets of rejection. The family of MIC genes consists of seven members, of which only MICA and MICB are functional. Transcripts are cell surface glycoproteins of 62 kDa that exhibit homology in sequence with HLA class I molecules and whose function is related to innate immunity. In transplanted organs an increase in the expression of MICA antigens occurs as an early sign of "danger" due to surgical trauma and ischemia. This antigenic overexpression can lead to rejection mediated by complement-activating anti-MICA antibodies and by increased cytotoxicity due to stimulation in natural killer (NK) lymphocytes and CD8 + αβ and γδ lymphocytes. Receptor known as NKG2D (NK group 2 member D).
机译:主要组织相容性复合体(MHC)基因编码的人白细胞抗原(HLA)在移植过程中起免疫反应的诱导作用。但是,与MHC I类链(MIC)相关的基因产物也是排斥的目标之一。 MIC基因家族由七个成员组成,其中只有MICA和MICB起作用。转录物是62 kDa的细胞表面糖蛋白,与HLA I类分子在序列上具有同源性,其功能与先天免疫有关。在移植的器官中,由于手术创伤和局部缺血,MICA抗原的表达增加是“危险”的早期征兆。这种抗原过度表达可导致由补体激活的抗MICA抗体介导的排斥反应,以及由于自然杀伤(NK)淋巴细胞以及CD8 +αβ和γδ淋巴细胞的刺激而增加的细胞毒性。受体称为NKG2D(NK组2成员D)。

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