Division of Medical Parasitology, Department of Microbiology, New York University School of Medicine, New York, New York, United States of America.
PLoS Pathog. 2012;8(10):e1002982. doi: 10.1371/journal.ppat.1002982. Epub 2012 Oct 25.
Plasmodium falciparum malaria is responsible for nearly one million annual deaths worldwide. Because of the difficulty in monitoring the pathogenesis of cerebral malaria in humans, we conducted a study in various mouse models to better understand disease progression in experimental cerebral malaria (ECM). We compared the effect on the integrity of the blood brain barrier (BBB) and the histopathology of the brain of P. berghei ANKA, a known ECM model, P. berghei NK65, generally thought not to induce ECM, P. yoelii 17XL, originally reported to induce human cerebral malaria-like histopathology, and P. yoelii YM. As expected, P. berghei ANKA infection caused neurological signs, cerebral hemorrhages, and BBB dysfunction in CBA/CaJ and Swiss Webster mice, while Balb/c and A/J mice were resistant. Surprisingly, PbNK induced ECM in CBA/CaJ mice, while all other mice were resistant. P. yoelii 17XL and P. yoelii YM caused lethal hyperparasitemia in all mouse strains; histopathological alterations, BBB dysfunction, or neurological signs were not observed. Intravital imaging revealed that infected erythrocytes containing mature parasites passed slowly through capillaries making intimate contact with the endothelium, but did not arrest. Except for relatively rare microhemorrhages, mice with ECM presented no obvious histopathological alterations that would explain the widespread disruption of the BBB. Intravital imaging did reveal, however, that postcapillary venules, but not capillaries or arterioles, from mice with ECM, but not hyperparasitemia, exhibit platelet marginalization, extravascular fibrin deposition, CD14 expression, and extensive vascular leakage. Blockage of LFA-1 mediated cellular interactions prevented leukocyte adhesion, vascular leakage, neurological signs, and death from ECM. The endothelial barrier-stabilizing mediators imatinib and FTY720 inhibited vascular leakage and neurological signs and prolonged survival to ECM. Thus, it appears that neurological signs and coma in ECM are due to regulated opening of paracellular-junctional and transcellular-vesicular fluid transport pathways at the neuroimmunological BBB.
恶性疟原虫疟疾在全球范围内造成近 100 万人死亡。由于难以监测人类脑型疟疾的发病机制,我们在各种小鼠模型中进行了一项研究,以更好地了解实验性脑型疟疾(ECM)的疾病进展。我们比较了以下因素对血脑屏障(BBB)完整性和大脑组织病理学的影响:已知的 ECM 模型 P. berghei ANKA、通常认为不会诱导 ECM 的 P. berghei NK65、最初报道可诱导人类脑型疟疾样组织病理学的 P. yoelii 17XL 和 P. yoelii YM。正如预期的那样,P. berghei ANKA 感染导致 CBA/CaJ 和瑞士 Webster 小鼠出现神经症状、脑内出血和 BBB 功能障碍,而 Balb/c 和 A/J 小鼠具有抗性。令人惊讶的是,PbNK 在 CBA/CaJ 小鼠中诱导 ECM,而其他所有小鼠均具有抗性。P. yoelii 17XL 和 P. yoelii YM 在所有小鼠品系中均引起致命性高寄生虫血症;未观察到组织病理学改变、BBB 功能障碍或神经症状。活体成像显示,含有成熟寄生虫的感染红细胞缓慢通过与内皮紧密接触的毛细血管,但没有停滞。除了相对罕见的微出血外,患有 ECM 的小鼠没有明显的组织病理学改变可以解释 BBB 的广泛破坏。然而,活体成像确实显示,患有 ECM 而不是高寄生虫血症的小鼠的后微静脉而非毛细血管或小动脉表现出血小板边缘化、血管外纤维蛋白沉积、CD14 表达和广泛的血管渗漏。阻断 LFA-1 介导的细胞相互作用可防止白细胞黏附、血管渗漏、神经症状和 ECM 导致的死亡。内皮屏障稳定介质伊马替尼和 FTY720 抑制血管渗漏和神经症状,并延长 ECM 存活时间。因此,似乎 ECM 中的神经症状和昏迷是由于神经免疫 BBB 中细胞旁连接和细胞内囊泡液转运途径的调节性开放所致。
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