PAPD5小分子抑制劑可用於恢復病人幹細胞的端粒酶活性
作者:
小柯機器人發布時間:2020/4/22 16:24:05
哈佛幹細胞研究所Suneet Agarwal研究組的一項工作開發出了一種PAPD5小分子抑制劑,可用於恢復病人幹細胞的端粒酶活性。該研究於2020年4月21日在線發表在《細胞—幹細胞》上。
研究人員報導了PAPD5的小分子抑制劑,該抑制劑在體外、幹細胞模型和體內能夠恢復端粒活性。PAPD5是一種非經典聚合酶,可寡聚腺苷酸化並使端粒酶RNA組分(TERC)不穩定。
研究人員鑑定到了BCH001,這是一種特異的PAPD5抑制劑,可在先天性角化病(DC)患者誘導的多能幹細胞中恢復端粒酶活性和端粒長度。當將經過工程改造的人血幹細胞(攜帶了能夠導致DC的PARN突變)移植到免疫缺陷小鼠中時,使用改造的PAPD5抑制劑(dihydroquinolizinone RG7834)進行口服治療,可以挽救TERC 3'末端成熟和端粒長度。
這些發現為開發系統性端粒療法鋪平了道路,從而能夠治療DC、肺纖維化和其他可能與衰老相關疾病中的幹細胞衰竭。
據介紹,降低端粒酶活性的遺傳損傷會抑制幹細胞複製,並導致一系列不治之症,包括先天性角化病(DC)和肺纖維化。恢復全身幹細胞端粒酶的方式尚不清楚。
附:英文原文
Title: Small-Molecule PAPD5 Inhibitors Restore Telomerase Activity in Patient Stem Cells
Author: Neha Nagpal, Jianing Wang, Jing Zeng, Emily Lo, Diane H. Moon, Kevin Luk, Roman O. Braun, Lauri M. Burroughs, Sioban B. Keel, Christopher Reilly, R. Coleman Lindsley, Scot A. Wolfe, Albert K. Tai, Patrick Cahan, Daniel E. Bauer, Yick W. Fong, Suneet Agarwal
Issue&Volume: 2020-04-21
Abstract: Genetic lesions that reduce telomerase activity inhibit stem cell replication andcause a range of incurable diseases, including dyskeratosis congenita (DC) and pulmonaryfibrosis (PF). Modalities to restore telomerase in stem cells throughout the bodyremain unclear. Here, we describe small-molecule PAPD5 inhibitors that demonstratetelomere restoration in vitro, in stem cell models, and in vivo. PAPD5 is a non-canonical polymerase that oligoadenylates and destabilizes telomeraseRNA component (TERC). We identified BCH001, a specific PAPD5 inhibitor that restoredtelomerase activity and telomere length in DC patient induced pluripotent stem cells.When human blood stem cells engineered to carry DC-causing PARN mutations were xenotransplanted into immunodeficient mice, oral treatment with arepurposed PAPD5 inhibitor, the dihydroquinolizinone RG7834, rescued TERC 3′ end maturationand telomere length. These findings pave the way for developing systemic telomeretherapeutics to counteract stem cell exhaustion in DC, PF, and possibly other aging-relateddiseases.
DOI: 10.1016/j.stem.2020.03.016
Source: https://www.cell.com/cell-stem-cell/fulltext/S1934-5909(20)30138-7