TUBERCULOSIS, HIV AND SURFACTANT APOPROTEINS

结核病、艾滋病毒和表面活性剂脱辅基蛋白

• 批准号: 6056556
• 负责人: William J Martin
• 金额: $ 27.25万
• 依托单位: INDIANA UNIV-PURDUE UNIV AT INDIANAPOLIS
• 依托单位国家: 美国
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-10 至 2003-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6056556
• 关键词: HIV infections; Mycobacterium tuberculosis; alveolar macrophages; bacteria infection mechanism; clinical research; diagnostic respiratory lavage; gene targeting; human immunodeficiency virus; human subject; laboratory mouse; phagocytosis; protein binding; pulmonary surfactants; respiratory protein; secondary infection; tuberculosis

DESCRIPTION (Adapted from the Applicant's Abstract): Pulmonary tuberculosis remains a serious world-wide problem. Mycobacterium tuberculosis (MTB) causes pulmonary infection by first being inhaled into the alveolar spaces where it attaches and enters alveolar macrophages (AM) to survive and replicate. The ability of MTB to use AM as a "safe habitat" is central to its survival during the earliest stages of infection. Studies from this laboratory indicate that bronchoalveolar lavage (BAL) fluid from HIV subjects contains a factor that promotes attachment of MTB to AM. This factor was shown to be surfactant protein A (SP-A). Preliminary data indicate that SP-D is also elevated in the HIV BAL fluid and can also promote MTB attachment to AM. Interestingly, two conditions associated with a marked elevation of SP-A and SP-D include HIV disease and silicosis; both conditions are associated with an increased risk for tuberculosis. Thus, the hypothesis is: SP-A/SP-D mediates attachment of MTB to AM in HIV-infected subjects facilitating MTB growth and survival in the alveolar spaces. The Specific Aims of this proposal include: 1 Determine molecular site(s) and characteristics of SP-A/SP-D binding to MTB; 2. Determine if: a)SP-A/SP-D mediated attachment of MTB to AM in vivo impairs AM immune response and/or facilitates MTB growth and b) prevention of SP-A/SP-D mediated attachment of MTB to AM in vivo blocks these effects suggesting a cause-effect mechanism; 3.) Determine if: a) SP-A/SP-D mediated attachment of MTB to AM in vivo impairs AM immune response and/or facilitates MTB growth and b) prevention of SP-A/SP-D- mediated attachment of MTB to AM in vivo blocks these effects suggesting a cause-effect mechanism; 4) Determine how human BAL fluid from normal and HIV-infected individuals influences MTB attachment to AM, the AM cytotoxic response and growth of MTB inside AM. If successful, these studies will result in the development of fundamentally new approaches to the study of pulmonary tuberculosis in HIV subjects. The opportunity to determine the specific site of SP-A or SP-D binding to MTB may provide insights that suggest novel therapeutic strategies in the future.

描述（改编自申请人摘要）：肺