Long non-coding RNA HCAR promotes endochondral bone repair by upregulating VEGF and MMP13 in hypertrophic chondrocyte through sponging miR-15b-5p.

Long non-coding RNA HCAR promotes endochondral bone repair by upregulating VEGF and MMP13 in hypertrophic chondrocyte through sponging miR-15b-5p.
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长非编码RNA HCAR通过海绵miR-15b-5p上调肥大软骨细胞中的VEGF和MMP13来促进软骨内骨修复

DOI:
10.1016/j.gendis.2020.07.013
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发表时间:
2022-03
期刊:
影响因子:
6.8
通讯作者:
Dong S
Dong S
中科院分区:
医学2区
文献类型:
--
作者:
Bai Y;Gong X;Dong R;Cao Z;Dou C;Liu C;Li J;Kang F;Dai J;Zhao C;Tian Z;Tan J;Dai Q;Dong S

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软骨内成骨是骨修复的重要途径。尽管越来越多的证据揭示了长非编码RNA(Long Non-Coding RNAs,LncRNAs)在骨和软骨发育中的作用,但LncRNAs在软骨内骨修复中的作用仍不清楚。在此,我们鉴定了一种名为肥厚性软骨细胞血管生成相关的LncRNA(HCAR),并证明它通过上调肥大软骨细胞基质金属肽酶13(MMP13)和血管内皮生长因子α(VEGFa)的表达来促进软骨内骨修复。在骨修复模型中,在肥大的软骨细胞中LNC-Hcar基因敲除抑制了软骨基质的重建,减少了CD31hiEmcnhi血管的数量。我们用荧光原位杂交(FISH)方法从机制上证明了lnc-hcar主要集中在细胞质中,并作为miR-15b-5p的分子海绵。此外,在肥大的软骨细胞中,lnc-Hcar竞争性地与miR-15b-5p结合以增加Vegfa和Mmp13的表达。我们的结果证明,lncRNA深入参与了软骨内骨修复,这将为未来促进骨折愈合的策略提供新的理论基础。
Endochondral bone formation is an important route for bone repair. Although emerging evidence has revealed the functions of long non-coding RNAs (lncRNAs) in bone and cartilage development, the effect of lncRNAs in endochondral bone repair is still largely unknown. Here, we identified a lncRNA, named Hypertrophic Chondrocyte Angiogenesis-related lncRNA (HCAR), and proved it to promote the endochondral bone repair by upregulating the expression of matrix metallopeptidase 13 (Mmp13) and vascular endothelial growth factor α (Vegfa) in hypertrophic chondrocytes. Lnc-HCAR knockdown in hypertrophic chondrocytes restrained the cartilage matrix remodeling and decrease the CD31hiEmcnhi vessels number in a bone repair model. Mechanistically, we proved that lnc-HCAR was mainly enriched in the cytoplasm using fluorescence in situ hybridization (FISH) assay, and it acted as a molecular sponge for miR-15b-5p. Further, in hypertrophic chondrocytes, lnc-HCAR competitively bound to miR-15b-5p to increase Vegfa and Mmp13 expression. Our results proved that lncRNA is deeply involved in endochondral bone repair, which will provide a new theoretical basis for future strategies for promoting fracture healing.
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