Zebrafish mafbb Mutants Display Osteoclast Over-Activation and Bone Deformity Resembling Osteolysis in MCTO Patients.

Zebrafish mafbb Mutants Display Osteoclast Over-Activation and Bone Deformity Resembling Osteolysis in MCTO Patients.
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斑马鱼 mafbb 突变体在 MCTO 患者中表现出破骨细胞过度激活和类似于骨溶解的骨畸形

DOI:
10.3390/biom11030480
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发表时间:
2021-03-23
期刊:
影响因子:
5.5
通讯作者:
Jing L
Jing L
中科院分区:
生物学2区
文献类型:
--
作者:
Han Y;Shao W;Zhong D;Ma C;Wei X;Ahmed A;Yu T;Jing W;Jing L

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多中心腕骨骨溶解(MCTO)是一种罕见的骨骼发育不良,伴有腕骨和跗骨骨溶解。在MCTO患者中发现转录因子MAFB的杂合错义突变。据报道,MAFB在体外对破骨细胞的发生具有负性调节作用。然而,MAFB的体内功能及其与MCTO的关系尚不清楚。在本研究中,我们利用CRISPR/Cas9技术生成了斑马鱼MAFB同源突变体。mabb缺陷斑马鱼表现出与MCTO患者相似的破骨细胞分化增强和软骨和骨发育异常。众所周知,破骨细胞是来源于巨噬细胞的造血细胞。mabb的缺失导致最终巨噬细胞和髓细胞选择性扩增,支持mabb在体内限制髓细胞分化。我们还证明,MAFB MCTO突变不能挽救MAFB - / -胚胎中有缺陷的破骨细胞生成,但不影响野生型胚胎中的破骨细胞。MCTO突变的机制可能是单倍不足。斑马鱼MAFB突变体为研究MAFB在破骨细胞发生和相关MCTO疾病中的功能提供了一个有用的模型。
Multicentric carpotarsal osteolysis (MCTO) is a rare skeletal dysplasia with osteolysis at the carpal and tarsal bones. Heterozygous missense mutations in the transcription factor MAFB are found in patients with MCTO. MAFB is reported to negatively regulate osteoclastogenesis in vitro. However, the in vivo function of MAFB and its relation to MCTO remains unknown. In this study, we generated zebrafish MAFB homolog mafbb mutant utilizing CRISPR/Cas9 technology. Mafbb deficient zebrafish demonstrated enhanced osteoclast cell differentiation and abnormal cartilage and bone development resembling MCTO patients. It is known that osteoclasts are hematopoietic cells derived from macrophages. Loss of mafbb caused selective expansion of definitive macrophages and myeloid cells, supporting that mafbb restricts myeloid differentiation in vivo. We also demonstrate that MAFB MCTO mutations failed to rescue the defective osteoclastogenesis in mafbb−/− embryos, but did not affect osteoclast cells in wild type embryos. The mechanism of MCTO mutations is likely haploinsufficiency. Zebrafish mafbb mutant provides a useful model to study the function of MAFB in osteoclastogenesis and the related MCTO disease.
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发表时间: 2020-01-15
影响因子: 2.7
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