克隆动力学,耐受性和不良事件后CD45-ADC-条件自主HSPC移植在
Taha Bartu Hayal1, Diana M Abraham2, Selami Demirci3
1National Institutes of Health, Bethesda, United States, Bethesda, Maryland, United States.
Blood advances
|January 27, 2026
概括
抗体-药物联合体 (ADCs) 在移植调节方面表现有前途. 0.2毫克/公斤的CD45-ADC导致了移植,但最终导致了免疫排斥,由德克萨米他逆转. 更高的剂量导致了毒性.
科学领域:
- 血液学 血液学 血液学
- 免疫学 免疫学 免疫学
- 药理学 药理学是指药理学的学科.
背景情况:
- 抗体与药物联合体 (ADC) 为移植条件提供了针对性,较少有毒的替代全身辐射 (TBI) 或化疗的替代方案.
- CD45-ADC针对CD45,一种泛白细胞抗原在造血干细胞 (HSPC) 和免疫细胞上,为基因治疗和全基因移植提供了潜在的策略.
研究的目的:
- 评估CD45-ADC作为一种调节剂在 rhesus macaques 自身移植之前的疗效和毒性.
- 为了评估HSPC复制,克隆动态,免疫耐受性和CD45-ADC调节后的潜在不良事件.
主要方法:
- rhesus 在接受两剂CD45-ADC (0.2或0.3 mg/kg) 调节后,接受了带条码的,用lentivirally 转导的HSPCs的自身移植.
- 监测了移植,细胞衰竭,淋巴细胞枯竭,克隆多样性和免疫反应 (抗CopGFP抗体).
- 评估了毒性,包括炎症性细胞因子水平和呼吸困扰.
主要成果:
- 这两种CD45-ADC剂量都导致了严重的HSPC枯竭和细胞衰竭,淋巴细胞不完全枯竭.
- 0.2 mg/kg的剂量导致了强大的多系植入和高克隆多样性,相当于TBI.
- 基因修饰细胞的免疫排斥发生在4-8个月,其证据是CopGFP+细胞水平和抗CopGFP抗体的下降;德甲治疗逆转了排斥.
- 剂量为0.3mg/kg导致两只动物严重呼吸困难和炎症性细胞因子升高,需要安乐死.
结论:
- CD45-ADC调节可以实现HSPC移植,但可能与免疫排斥有关,可能通过免疫抑制减轻.
- 0.3mg/kg剂量表现出显著的毒性,强调需要仔细的剂量确定和临床前评估.
- 较低剂量的CD45-ADC与免疫抑制相结合,可能是一个可行的策略,用于在涉及异抗原或新抗原表达的移植环境中长期植入.
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