Complement binding by two developmental stages of Leishmania major promastigotes varying in expression of a surface lipophosphoglycan

Complement binding by two developmental stages of Leishmania major promastigotes varying in expression of a surface lipophosphoglycan
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利什曼原虫主要前鞭毛体两个发育阶段的补体结合,表面脂磷酸聚糖的表达不同

DOI:
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发表时间:
1988
影响因子:
15.3
通讯作者:
K A Joiner
K A Joiner
中科院分区:
医学1区
文献类型:
--
作者:
S. M. Puentes;David L. Sacks;Rosangela P Da Silva;K A Joiner

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已研究了大型利什曼原虫两个发育不同阶段的补体结合。非感染性对数生长期 (LOG) 前鞭毛体(血清敏感)通过将共价结合的 C3b 沉积到寄生虫表面来激活补体。感染性花生凝集素 (PNA-) 后循环阶段前鞭毛体(血清抗性)在血清中孵育后也主要带有 C3b,但沉积的 C3 的主要部分以 110 X 10(3) mol wt C3 片段的形式存在。而 C3b 在 LOG 前鞭毛体上的沉积是通过替代途径介导的。 PNA-寄生虫无法激活非免疫血清中的旁路途径。 C3 通过蛋白水解从寄生虫表面释放,LOG 的释放速度几乎是 PNA-前鞭毛体的三倍。免疫沉淀实验表明,发育调节的脂磷酸聚糖是 LOG 和 PNA 寄生虫上的主要 C3 受体。这些实验首次比较了利什曼原虫感染性和非感染性前鞭毛体上补体的形式和加工,为进一步定义单核吞噬细胞内这些寄生虫的差异性 C3 受体依赖性摄取和存活提供了框架。
The binding of complement by two developmentally distinct stages of Leishmania major has been studied. Noninfective log phase growth (LOG) promastigotes (serum sensitive) activate complement with deposition of covalently bound C3b onto the surface of the parasite. Infective, peanut agglutinin (PNA-) metacyclic stage promastigotes (serum resistant) also bear mainly C3b after incubation in serum, but a major portion of deposited C3 is present as a 110 X 10(3) mol wt C3 fragment. Whereas deposition of C3b on LOG promastigotes is mediated through the alternative pathway. PNA- parasites are unable to activate the alternative pathway in nonimmune serum. C3 is released from the parasite surface by proteolytic cleavage, at a rate which is nearly threefold greater for LOG than for PNA- promastigotes. Immunoprecipitation experiments show that the developmentally regulated lipophosphoglycan is a major C3 acceptor on both LOG and PNA- parasites. These experiments, which are the first to compare the form and processing of complement on infective and noninfective promastigotes of Leishmania, provide a framework for further definition of the differential C3 receptor-dependent uptake and survival of these parasites within mononuclear phagocytes.
C3 的多功能作用:其与生理配体相互作用的结构分析。
DOI: 10.1016/0161-5890(86)90157-4
发表时间: 1986
影响因子: 3.6
作者:
Lambris,JD;Müller-Eberhard,HJ
通讯作者: Müller-Eberhard,HJ
DOI: 10.4049/jimmunol.135.4.2785
发表时间: 1985-10
影响因子: 4.4
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利什曼原虫的两亲性硫酸化糖缀合物:用单克隆抗体进行表征。
DOI: 10.1002/j.1460-2075.1984.tb02130.x
发表时间: 1984
期刊: The EMBO journal
影响因子: --
作者:
Handman,E;Greenblatt,CL;Goding,JW
通讯作者: Goding,JW
共价结合的 C3b 从细胞表面自然释放以及在液相系统中研究这种现象。
DOI: --
发表时间: 1984
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
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Venkatesh,YP;Minich,TM;Law,SK;Levine,RP
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杜氏利什曼原虫中一种不寻常的酸性糖复合物的表达。
DOI: --
发表时间: 1984
期刊: The Journal of biological chemistry
影响因子: --
作者:
Turco,SJ;Wilkerson,MA;Clawson,DR
通讯作者: Clawson,DR