Mosquito SAMSP1 and SAMSP2 influence the initial stage of Plasmodium infection of mice

摘要 该提案将阐明蚊子唾液中的两种特定蛋白质如何影响早期阶段 小鼠体内的疟原虫感染。我们的小组之前开发了一个通用筛选来识别蛋白质 冈比亚按蚊唾液在蚊子移动和沉积过程中与子孢子结合 进入哺乳动物宿主的皮肤（Schleicher 格雷厄姆 TR，杨J，弗洛伊宗M，伦比斯A，工艺S，汉密尔顿M， M、Mlambo G、Tripathi AK、Li Y、Cresswell P、Sinnis P、Dimopoulos G、Fikrig E. Nat Commun。 2018年 25；9(1)：2908）。鉴定出多种蛋白质，包括子孢子相关的蚊子唾液蛋白 (SAMSP)1 和 SAMSP2。我们的初步数据表明 SAMSP1 在促进疟原虫 小鼠感染，SAMSP2 具有免疫调节活性。该提案现在将审查 SAMSP1 和 SAMPS2 在影响小鼠疟原虫感染初期的重要性。基因 沉默和抗体阻断研究将评估这些蛋白质在小鼠早期阶段的作用 感染。真皮体内双光子显微镜，以及评估运动和免疫的体外测定 调节，将描述 SAMSP1 和 SAMSP2 对子孢子活性的影响。了解 SAMSP1 和 SAMSP2 在疟原虫感染中的重要性有望带来新的对抗策略 疟疾。

ABSTRACT This proposal will elucidate how two specific proteins in mosquito saliva influence the early stage of Plasmodium infection in mice. Our group previously developed a general screen to identify proteins in Anopheles gambiae saliva that associate with sporozoites during movement out the mosquito and deposition into the skin of a mammalian host (Schleicher Graham TR, Yang J, Freudzon M, Rembisz A, Craft S, Hamilton M, M, Mlambo G, Tripathi AK, Li Y, Cresswell P, Sinnis P, Dimopoulos G, Fikrig E. Nat Commun. 2018 25;9(1):2908). Several proteins were identified, including sporozoite-associated mosquito saliva protein (SAMSP) 1 and SAMSP2. Our preliminary data shows that SAMSP1 plays a role in facilitating Plasmodium infection in mice and that SAMSP2 has immunomodulatory activity. This proposal will now examine the importance of SAMSP1 and SAMPS2 in influencing the initial stage of Plasmodium infection in mice. Gene silencing and antibody blocking studies will assess the role of these proteins in the early stages of murine infection. In vivo two-photon microscopy of the dermis, and in vitro assays to assess movement and immune modulation, will delineate the effects of SAMSP1 and SAMSP2 on sporozoite activity. Understanding the importance of SAMSP1 and SAMSP2 in Plasmodium infection will hopefully lead to new strategies to combat malaria.