Oakley Miranda S, McCutchan Thomas F, Anantharaman Vivek, Ward Jerrold M, Faucette Laurence, Erexson Cindy, Mahajan Babita, Zheng Hong, Majam Victoria, Aravind L, Kumar Sanjai
Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA.
Infect Immun. 2008 Oct;76(10):4518-29. doi: 10.1128/IAI.00525-08. Epub 2008 Jul 21.
Cerebral malaria (CM) is a primary cause of malaria-associated deaths among young African children. Yet no diagnostic tools are available that could be used to predict which of the children infected with Plasmodium falciparum malaria will progress to CM. We used the Plasmodium berghei ANKA murine model of experimental cerebral malaria (ECM) and high-density oligonucleotide microarray analyses to identify host molecules that are strongly associated with the clinical symptoms of ECM. Comparative expression analyses were performed with C57BL/6 mice, which have an ECM-susceptible phenotype, and with mice that have ECM-resistant phenotypes: CD8 knockout and perforin knockout mice on the C57BL/6 background and BALB/c mice. These analyses allowed the identification of more than 200 host molecules (a majority of which had not been identified previously) with altered expression patterns in the brain that are strongly associated with the manifestation of ECM. Among these host molecules, brain samples from mice with ECM expressed significantly higher levels of p21, metallothionein, and hemoglobin alpha1 proteins by Western blot analysis than mice unaffected by ECM, suggesting the possible utility of these molecules as prognostic biomarkers of CM in humans. We suggest that the higher expression of hemoglobin alpha1 in the brain may be associated with ECM and could be a source of excess heme, a molecule that is considered to trigger the pathogenesis of CM. Our studies greatly enhance the repertoire of host molecules for use as diagnostics and novel therapeutics in CM.
脑型疟疾(CM)是非洲幼童中与疟疾相关死亡的主要原因。然而,目前尚无可用的诊断工具来预测感染恶性疟原虫疟疾的儿童中哪些会发展为脑型疟疾。我们使用了伯氏疟原虫ANKA实验性脑型疟疾(ECM)小鼠模型和高密度寡核苷酸微阵列分析来鉴定与ECM临床症状密切相关的宿主分子。对具有ECM易感表型的C57BL/6小鼠以及具有ECM抗性表型的小鼠进行了比较表达分析:C57BL/6背景的CD8基因敲除小鼠和穿孔素基因敲除小鼠以及BALB/c小鼠。这些分析使得能够鉴定出200多种宿主分子(其中大多数以前未被鉴定),它们在大脑中的表达模式发生改变,与ECM的表现密切相关。在这些宿主分子中,通过蛋白质印迹分析,患有ECM的小鼠脑样本中p21、金属硫蛋白和血红蛋白α1蛋白的表达水平明显高于未受ECM影响的小鼠,这表明这些分子可能作为人类脑型疟疾预后生物标志物的效用。我们认为大脑中血红蛋白α1的高表达可能与ECM有关,并且可能是过量血红素的来源,血红素是一种被认为触发脑型疟疾发病机制的分子。我们的研究极大地增加了用作脑型疟疾诊断和新型治疗方法的宿主分子种类。