Osterix regulates corticalization for longitudinal bone growth via integrin β3 expression

Experimental & Molecular Medicine
Young Jae MoonEui-Sic Cho

Abstract

Corticalization, coalescence of trabecular bone into the metaphyseal cortex, is important for the longitudinal growth of long bones. However, little is known about the molecular mechanisms controlling corticalization. To understand the molecular mechanisms underlying corticalization, we analyzed osteoblast-specific Osterix-knockout mice (Col-OMT). In control mice, corticalization was initiated after 7 postnatal days, and the number of osteoblasts in the peripheral spongiosa was increased compared to the number in the central spongiosa. In contrast, in Col-OMT mice, corticalization was delayed, and the number of osteoblasts in peripheral zones was unchanged compared to the central zone. Furthermore, femoral length was decreased in Col-OMT mice at 1 month. Because Col-OMT mice exhibited impaired matrix coalescence and osteoblast migration, we evaluated integrin signaling in Col-OMT mice. Osterix bound to the Itgb3 promoter and increased transcription of the Itgb3 gene in osteoblast cells. Interestingly, the inner and outer cortical bones were separated in Itgb3-null mice at postnatal day 7. In Itgb3-null mice, the number of osteoblasts in peripheral zones was not changed, and the femoral length was decreased. Taken together, thes...Continue Reading

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Citations

Feb 2, 2019·Journal of Biomedical Materials Research. Part a·Helena B LopesMarcio M Beloti
May 30, 2019·Journal of Cellular and Molecular Medicine·Wenjie JiaoRongjian Xu
Jan 2, 2021·Frontiers in Cell and Developmental Biology·Qian LiuGuangwei Wang
Aug 8, 2021·International Journal of Molecular Sciences·Yongguang GaoJingxian Jia

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Methods Mentioned

BETA
PCR
transfections
immunoprecipitation
ChIP

Software Mentioned

CTAn
SPSS

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