Elucidation of Antisickling Molecules in a Botanical with Antisickling Activity

描述：镰状细胞病(SCD)是世界上最常见的遗传病，迫切需要新的治疗剂来治疗。我们的长期目标是开发一种用于儿童的药物，以防止SCD的不可避免的发展。SCD在美国影响大约10万人，在全球影响数百万人。在非洲，它杀死的儿童比艾滋病毒还多，但尽管艾滋病毒引起了国际社会的广泛关注，但慢性萎缩性胃炎“几乎是看不见的”。在美国，SCD患者的平均死亡率为40多岁，估计每年的医疗费用总额超过14亿美元。在欠发达国家，80%的SCD儿童在5岁之前死亡。FDA批准的唯一用于SCD的疾病修正药物是抗癌药物羟基脲，该药物具有严重的副作用，仅被批准用于成人。系统性红斑狼疮是由珠蛋白基因(S)的突变引起的，该基因是成人常见的血红蛋白A的变种。当脱氧时，血红蛋白S聚合，形成长聚合物，使双凹红细胞(RBC)变形为坚硬的、粘连的镰刀状细胞。坚硬的镰状红细胞很容易被困在微血管中，阻止流向组织和器官的血液，从而导致组织缺血损伤。对SCD最好的支持性治疗包括治疗贫血的叶酸、预防感染的青霉素、肺炎球菌和流感疫苗接种、止痛药和静脉注射液体。慢性输血疗法可以改变疾病的进程，但高粘滞性、同种异体免疫反应、感染和铁超载只是输血疗法的几个并发症。骨髓移植可以治愈SCD，但该手术的发病率和死亡率，再加上难以找到匹配的捐赠者和手术费用，使其成为一种不常见的治疗选择。我们已经鉴定出一种具有很强的抗病活性的植物提取物。我们建议通过生物测定指导分离植物提取物中的活性化合物，使用体外试验来测量人红细胞在低氧条件下的镰刀状。活性部分将进一步分离，亚组分中的化合物将通过质谱学和核磁共振进行鉴定，并在100%人Hb S转基因小鼠中证实体内活性。

DESCRIPTION: New therapeutic agents are urgently needed for the treatment of sickle cell disease (SCD), the world's most common genetic disease. Our long-term goal is to develop a drug for use in children that prevents the inexorable progression of SCD. SCD affects approximately 100,000 people in the United States and millions worldwide. It kills more children in Africa than HIV, but while HIV commands vast attention from the international community, SCD is "virtually invisible." In the US, those with SCD have an average mortality in their 40s and an estimated aggregate cost of medical care in excess of $1.4 billion per year. In less developed countries, 80% of children with SCD die before the age of five. The only FDA approved disease-modifying drug for use in SCD is the anti-cancer drug hydroxyurea, which has serious side effects and is only approved for use in adults. SCD results from a mutation in the ¿-globin gene (Hb S), a variant of Hb A, the common adult hemoglobin. When deoxygenated, Hb S polymerizes, forming long polymers that deform the biconcave red blood cells (RBCs) into rigid, adherent, sickle-shaped cells. The rigid sickled RBCs are easily trapped in the microvasculature, blocking blood flow to tissues and organs with resultant ischemic tissue damage. Best supportive therapies for SCD include folic acid for anemia, penicillin to prevent infections, pneumococcal and influenza vaccinations, pain medication, and intravenous injection of fluids. Chronic transfusion therapy can modify the course of the disease, but hyperviscosity, alloimmune reaction, infection, and iron overload are just a few of the complications of transfusion therapy. Bone marrow transplants can cure SCD, but the morbidity and mortality of the procedure, coupled with difficulty in finding a donor match and the cost of the procedure, leave this an uncommon treatment option. We have identified a botanical extract with potent antisickling activity. We propose to isolate the active compounds in the botanical by bio-assay guided fractionation of the botanical extract using an in vitro assay that measures sickling of human RBCs under hypoxic conditions. The active fractions will be further fractionated, the compounds in the sub-fractions identified using mass spectroscopy and NMR, and in vivo activity confirmed in 100% human Hb S transgenic mice.