Department of International Health, Boston University School of Public Health, Boston, MA 02118, USA.
Trop Med Int Health. 2013 Mar;18(3):313-27. doi: 10.1111/tmi.12056. Epub 2013 Jan 16.
Sickle cell disease (SCD) is a chronic debilitating disorder affecting erythrocytes, which is especially prevalent throughout Sub-Saharan Africa and among individuals of African descent. Because malaria is thought to be a significant cause of morbidity and mortality in patients with SCD, malaria chemoprophylaxis is often recommended for these patients. In SCD, malaria chemoprophylaxis reduces malaria parasite count, anaemia and the need for blood transfusion, and improves clinical outcomes. However, the effectiveness of malaria chemoprophylaxis in the setting of SCD is based on a few studies conducted prior to the emergence of widespread antimalarial drug resistance. Consequently, it is uncertain what the optimal strategy for managing patients with SCD in malarious areas should be. Despite the widespread use of hydroxyurea in non-malarious regions, little is known about its effect in malaria-endemic areas or on malaria-related outcomes. On the one hand, hydroxyurea upregulates intercellular cell adhesion molecule 1 (ICAM-1), the cell surface receptor for adhesion of Plasmodium falciparum-infected erythrocytes, and theoretically, it could enhance parasite replication. On the other hand, hydroxyurea increases levels of foetal haemoglobin, which is protective against malaria. We explore what is currently known about the interactions between SCD and malaria and review the published literature on the efficacy of malaria chemoprophylaxis in SCD. We also consider alternative strategies, including hydroxyurea, in the reduction of malaria-associated morbidity and mortality in patients with SCD.
镰状细胞病(SCD)是一种影响红细胞的慢性衰弱性疾病,尤其在撒哈拉以南非洲和非洲裔人群中普遍存在。由于疟疾被认为是 SCD 患者发病率和死亡率的重要原因,因此常建议这些患者使用疟疾化学预防。在 SCD 中,疟疾化学预防可降低疟原虫计数、贫血和输血需求,并改善临床结局。然而,在疟疾广泛耐药之前进行的少数研究基础上,疟疾化学预防在 SCD 中的有效性尚不确定。因此,对于疟疾流行地区的 SCD 患者,应采取何种最佳管理策略尚不清楚。尽管羟基脲在无疟疾地区广泛使用,但人们对其在疟疾流行地区的效果或对疟疾相关结局的影响知之甚少。一方面,羟基脲上调细胞间黏附分子 1(ICAM-1),即疟原虫感染红细胞的细胞表面受体,理论上可增强寄生虫复制。另一方面,羟基脲增加胎儿血红蛋白水平,从而对疟疾具有保护作用。我们探讨了目前已知的 SCD 与疟疾之间的相互作用,并回顾了有关 SCD 中疟疾化学预防效果的已发表文献。我们还考虑了替代策略,包括羟基脲,以降低 SCD 患者与疟疾相关的发病率和死亡率。
Trop Med Int Health. 2013-1-16
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