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Evaluation of the age-dependent development of lymphocyte surface receptors in children.

机译:评价儿童淋巴细胞表面受体的年龄依赖性发展。

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Components and functions of the immune system change during postnatal development, not only in the first years of life, but well through adolescence and even into adult life. These age-dependent changes within the immune system greatly complicate any attempt to assess pathological alterations of immunologic variables in children. The need for studies on possible substance-induced changes, including risk assessment of environmental chemicals, has increased the necessity to establish reference ranges for certain immunologic variables against which an abnormal developmental status can be evaluated. In the present study age-related changes of surface receptors on peripheral white blood cells were studied in 82 children, aged between 2 months and 17 years. The blood samples were triple labeled with monoclonal antibodies followed by a whole blood lysis technique and were subsequently analyzed by flow cytometry. Complex statistical analyses were performed in order to determine probability ranges for some immunological variables. In this paper we describe the age-dependent development of components involved in major maturational processes, including the appearance and varying expression of adhesion receptors (CD11a, CD18, CD28, CD29, CD44, CD49d and CD54) on CD4+ "helper" cells and CD8+ "suppressor and cytotoxic" cells. A clear-cut increase of high epitope density expression of the integrins on both CD4+ and CD8+ cells was noted. These results suggest that the components of immune T cells for performing adhesion by interacting with other cells and many matrix components are largely acquired during postnatal development. Maximal levels of adhesion receptor expression are reached at different ages depending on the specific T cell subpopulation.
机译:免疫系统的组成和功能不仅在生命的最初几年,而且在青春期甚至成年后都会发生变化。免疫系统中这些与年龄有关的变化极大地使评估儿童免疫学变量病理改变的任何尝试变得复杂。对可能的由物质引起的变化进行研究的需求,包括对环境化学物质的风险评估,增加了为某些免疫学变量建立参考范围的必要性,可以根据这些参考变量评估异常的发育状况。在本研究中,研究了82名年龄在2个月至17岁之间的儿童外周血白细胞表面受体的年龄相关变化。用单克隆抗体对血样进行三重标记,然后采用全血裂解技术,然后通过流式细胞仪进行分析。为了确定某些免疫学变量的概率范围,进行了复杂的统计分析。在本文中,我们描述了主要成熟过程中涉及组分的年龄依赖性发育,包括CD4 +“辅助”细胞和CD8 +上粘附受体(CD11a,CD18,CD28,CD29,CD44,CD49d和CD54)的出现和表达变化“抑制剂和细胞毒性”细胞。注意到整联蛋白在CD4 +和CD8 +细胞上的高表位密度表达的明显增加。这些结果表明,在出生后的发育过程中大量获得了通过与其他细胞相互作用而进行粘附的免疫T细胞成分和许多基质成分。根据特定的T细胞亚群,在不同年龄达到粘附受体表达的最大水平。

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