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通过基于抗体的血液造血干细胞的清除有效的移植

Agnieszka Czechowicz¹, Daniel Kraft, Irving L Weissman

¹Institute of Stem Cell Biology and Regenerative Medicine, Departments of Pathology and Developmental Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.

Science (New York, N.Y.)

|November 24, 2007

概括

用ACK2抗体阻断c-kit暂时耗尽宿主造血干细胞 (HSC),显著改善了供体HSC移植. 这表明了干细胞移植的新,更温和的调节方法.

科学领域:

血液学血液学血液学
免疫学免疫学免疫学
移植生物学移植生物学

背景情况:

造血干细胞 (HSC) 移植对于治疗各种疾病至关重要.
目前的HSC移植需要有毒的预先调整方案,这限制了它的应用.
供体HSC移植受到免疫障碍和宿主HSC占用的阻碍.

研究的目的:

调查位占用在限制捐赠者HSC移植中的作用.
探索一种新的,少有毒的预先调节方法,用于HSC移植.

主要方法:

利用ACK2抗体阻止c-kit功能,并在免疫缺陷小鼠中暂时耗尽内源性HSC.
在ACK2治疗后向小鼠静脉注射了捐赠者HSC.
评估了嵌合体水平,以评估供体HSC移植.

主要成果:

使用ACK2导致超过98%的内源性HSCs被清除.
移植后的供体HSC实现了高的嵌合体水平,在接受者小鼠中高达90%.
证明宿主HSCs的暂时耗尽显著增强了供体HSC的移植.

结论:

宿主HSC位占用是捐赠者HSC移植的重要障碍,独立于免疫排斥.
通过c-kit封锁暂时耗尽宿主HSC,为开发HSC移植的较温和调节方案提供了一个有希望的策略.
这种方法有可能提高人类干细胞移植的安全性和有效性.

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