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Blood:磷脂酰肌醇转运蛋白参与调控巨核细胞TGF-β1分泌和造血作用

2018-07-25 MedSci MedSci原创

中心点:磷脂酰肌醇转运蛋白(Pitps)可刺激巨核细胞分泌TGF-β1,进而调控造血。Pitpα-/-·β-/-巨核细胞的α颗粒的形态和功能均存在缺陷。摘要:Maegan Capitano等人推测磷脂酰肌醇转运蛋白(Pitp)介导的巨核细胞(MK)磷酸肌醇信号参与造血干细胞(HSC)和造血祖细胞(HPC)调控,故建立特异性敲除MKs和血小板的Pitps的小鼠模型(pitpα-/-和pitpα-/-

中心点:

磷脂酰肌醇转运蛋白(Pitps)可刺激巨核细胞分泌TGF-β1,进而调控造血。

Pitpα-/-·β-/-巨核细胞的α颗粒的形态和功能均存在缺陷。

摘要:

Maegan Capitano等人推测磷脂酰肌醇转运蛋白(Pitp)介导的巨核细胞(MK)磷酸肌醇信号参与造血干细胞(HSC)和造血祖细胞(HPC)调控,故建立特异性敲除MKs和血小板的Pitps的小鼠模型(pitpα-/-和pitpα-/-·β-/-),对此开展研究。

pitpα-/-和pitpα-/-·β-/-小鼠骨髓(BM)中的HSC、巨核系-红系祖细胞和HPC数量均减少。竞争性移植和限制性稀释分析显示pitpα-/-·β-/-BM的移植能力明显降低。与WT BM MK相比,培养pitpα-/-和pitpα-/-·β-/-BM MKs的培养基(CM)中含有更高水平的转化生长因子β1(TGF-β1)和白介素(IL)-4。pitpα-/-和pitpα-/-·β-/-MKs的CM可显着抑制HPC的克隆形成;在体外,该抑制作用可被中和性抗TGF-β抗体完全抵消;抗TGF-β抗体治疗pitpα-/-·β-/-小鼠也可完全逆转其BM HSC和HPC数量缺陷。在体外,TGF-β和IL-4可协同抑制HPC克隆形成。pitpα-/-·β-/-MKs的电子显微镜分析其超微结构发现α颗粒缺乏,还存在大的畸形的多囊体。血管性血友病因子和血小板反应蛋白,类似于TGF-β,均储存于MKs的α颗粒,在培养pitpα-/-·β-/-MKs的CM中也表现为增高。

总而言之,敲除MKs的Pitps可通过扰乱α颗粒的正常生理、破坏TGF-β分泌间接影响造血作用。

原始出处:

Maegan Capitano,et al. Phosphatidylinositol transfer proteins regulate megakaryocyte TGF-β1 secretion and hematopoiesis in mice. Blood  2018  :blood-2017-09-806257;  doi: https://doi.org/10.1182/blood-2017-09-806257 

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    2019-06-28 yzh409
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    2019-06-29 changhe713
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    2018-08-15 gwc392
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    2018-07-27 俅侠

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先天性巨核细胞增生不良性血小板减少症(CAMT)是一种罕见的遗传性骨髓衰竭综合征,表现为严重的血小板减少、骨髓巨核细胞减少或缺如,不伴有特异性躯体畸形,最终发展为再生障碍性贫血或继发性骨髓恶性肿瘤。在早期报道中,由于无法及时进行血小板输注及造血干细胞移植(HSCT)等相关治疗,多数患儿最终发展为骨髓衰竭而死亡。近年来随着对该病发病机制的深入研究及HSCT的广泛开展,许多患儿已得到成功救治。国内关于

Blood:敲除CK2β基因可以减少血栓形成,甚至可降低中风风险。

血小板,巨核细胞分裂出的无核细胞质,在止血和动脉血栓形成过程中发挥重要作用。酪蛋白激酶2(CK2)在巨核细胞和血小板中都可以检测到,对于CK2依赖性信号通路对巨噬细胞/血小板的病理生理机制的作用尚不明确。

Nat Med:巨核细胞可控制造血干细胞 有望治疗多种疾病

巨核细胞被认为是产生血小板愈合伤口最好的细胞,这些在骨髓中发现的巨大细胞在调节干细胞上也扮演着重要的角色,这是近日来自美国密苏里州斯托瓦斯医学研究所(Stowers Institute for Medical Research)的研究人员的一项重大研究发现,相关研究成果刊登于国际杂志Nature Medicine上。 实际上,造血干细胞在骨髓中可以分化形成巨核细胞,而本文研究者也首次发现造血

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