一个哈普托格洛宾-血红蛋白受体传递人类对Trypanosoma brucei的天生的免疫力
Benoit Vanhollebeke1, Géraldine De Muylder, Marianne J Nielsen
1Laboratory of Molecular Parasitology, Institute for Molecular Biology and Medicine, Université Libre de Bruxelles, 12 rue des Profs Jeener et Brachet, B6041 Gosselies, Belgium.
概括
人类高密度脂蛋白 (HDL) 通过一种寄生虫受体溶解Trypanosoma brucei,该受体与哈普托格洛宾-血红蛋白结合. 这种对小鼠寄生虫生长至关重要的相互作用,解释了人类中与球蛋白相关的蛋白质如何触发对寄生虫的天生的免疫力.
科学领域:
- 寄生虫学的寄生虫学
- 免疫学 免疫学 免疫学
- 生物化学 生物化学
背景情况:
- trypanosoma brucei 是一种原生虫寄生虫,会导致人类的非洲试虫病.
- 人类高密度脂蛋白 (HDL) 颗粒,含有阿波利波蛋白L-I和哈普托格洛宾相关蛋白质,具有解活性.
- 人们还不完全了解HDL溶解T. brucei的机制以及与哈普托格洛宾相关的蛋白质的作用.
研究的目的:
- 确定负责调解HDL的解效应的寄生虫受体.
- 研究这种受体在寄生虫生长和宿主-病原体相互作用中的功能.
- 阐明与哈普托格洛宾相关的蛋白质在人类对T. brucei.天生的免疫力中的作用.
主要方法:
- 寄生虫糖蛋白受体的生物化学表征.
- 使用哈普托格洛宾-血红蛋白和与哈普托格洛宾相关的蛋白质-血红蛋白复合物的结合性测试.
- 在小鼠模型中的体内研究,以评估寄生虫的生长和对氧化应激的抵抗力.
- 在人类HDL的背景下对受体相互作用的分析.
主要成果:
- 鉴定出了一种寄生虫糖蛋白受体,该受体与高亲和力结合了哈普托格洛宾-血红蛋白复合体.
- 这种受体对于血红素的吸收和纳入寄生虫血红蛋白至关重要.
- 在小鼠中,该受体对于最佳的寄生虫生长和对巨细胞氧化突发的保护是必需的.
- 试酶体受体识别了与人体哈普托格洛宾相关的蛋白质-血红蛋白复合体,促进了试解 HDL 的捕获.
结论:
- 已识别的寄生虫受体调解了必不可少的血红素的吸收,支持寄生虫的生长和生存.
- 在人体中,与哈普托格洛宾相关的蛋白质重新定位了这个受体,使得解性HDLs的捕获成为可能,并有助于对T. brucei.天生的免疫力.
- 这种宿主-病原体相互作用突出了对寄生虫感染的天生的免疫防御机制.
相关概念视频
American Trypanosomiasis
Chagas disease, or American trypanosomiasis, is a vector-borne parasitic infection caused by Trypanosoma cruzi, a flagellated protozoan (kinetoplastid) of the family Trypanosomatidae. The disease is endemic in Latin America, although cases are increasingly reported worldwide due to human migration. Transmission most commonly occurs when feces of infected triatomine bugs contaminate bite wounds or mucosal surfaces; additional routes include congenital, transfusional, transplant-related, and oral...
Antiprotozoal Agents
Leishmaniasis is a widespread parasitic disease caused by several Leishmania species. It affects millions of people each year and remains a major public health problem in endemic regions. First-line treatment relies on pentavalent antimonials, including meglumine antimoniate and sodium stibogluconate. Even so, how these drugs work has not been fully clear, especially their interaction with parasite-specific biochemical pathways. One key target is trypanothione reductase (TR), an enzyme that...
Malaria
Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...
Defense Against Bacterial Pathogens
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Antigens Involved in Adaptive Immunity
An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.


