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Impact of flow shear stress on morphology of osteoblast-like IDG-SW3 cells

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Abstract

This study constructed an in situ cell culture, real-time observation system based originally on a microfluidic channel, and reported the morphological changes of late osteoblast-like IDG-SW3 cells in response to flow shear stress (FSS). The effects of high (1.2 Pa) and low (0.3 Pa) magnitudes of unidirectional FSS and three concentrations of extracellular Type I collagen (0.1, 0.5, and 1 mg/mL) coating on cell morphology were investigated. IDG-SW3 cells were cultured in polydimethylsiloxane microfluidic channels. Cell images were recorded real-time under microscope at intervals of 1 min. Cell morphology was characterized by five parameters: cellular area, cell elongation index, cellular alignment, cellular process length, and number of cellular process per cell. Immunofluorescence assay was used to detect stress fiber distribution and vinculin expression. The results showed that 1.2 Pa, but not 0.3 Pa of FSS induced a significant morphological change in late osteoblast-like IDG-SW3 cells, which may be caused by the alteration of cellular adhesion with matrix in response to FSS. Moreover, the amount of collagen matrix, alignment of fiber stress and expression of vinculin were closely correlated with the morphological changes of IDG-SW3 cells. This study suggests that osteoblasts are very responsive to the magnitudes of FSS, and extracellular collagen matrix and focal adhesion are directly involved in the morphological changes adaptive to FSS.

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Acknowledgements

We thank the Grants from the National Natural Science Foundation of China (81472090 & 31328016 to HX, JXJ and PS), the Fundamental Research Funds for the Central Universities (3102016ZY036 to HX), and National Institute of Health Grant (CA196214 to JXJ) and Welch Foundation Grant (AQ-1507 to JXJ).

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Author notes

  1. Huiyun Xu and Jing Duan contributed equally to this work.

Authors and Affiliations

  1. Key Laboratory for Space Biosciences and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, China

    Huiyun Xu, Jing Duan, Li Ren, Pengfei Yang, Ruixin Yang, Wenbin Li, Dongdong Zhao & Peng Shang

  2. Department of Biochemistry, University of Texas Health Science Center at San Antonio, San Antonio, TX, 78229, USA

    Jean X. Jiang

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  1. Huiyun Xu
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  2. Jing Duan
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  3. Li Ren
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  4. Pengfei Yang
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  5. Ruixin Yang
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  6. Wenbin Li
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  7. Dongdong Zhao
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  8. Peng Shang
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  9. Jean X. Jiang
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Correspondence to Huiyun Xu or Jean X. Jiang.

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Xu, H., Duan, J., Ren, L. et al. Impact of flow shear stress on morphology of osteoblast-like IDG-SW3 cells. J Bone Miner Metab 36, 529–536 (2018). https://doi.org/10.1007/s00774-017-0870-3

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  • DOI: https://doi.org/10.1007/s00774-017-0870-3

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