Abstract
Mammary fibrosis in dairy cows is a chronic condition caused by mastitis, and can lead to serious culling of dairy cows resulting in huge economic losses in the dairy industry. MicroRNAs (miRNAs) exert an important role in regulating mammary gland health in dairy cows. This study investigated whether exosomal miRNAs in mammary epithelial cells can regulate the proliferation of bovine mammary fibroblasts (BMFBs) in mastitis. Liposome transfection technology was used to construct a cellular model of the overexpression and inhibition of miRNAs. The STarMir software, dual luciferase reporter gene test, real-time quantitative PCR (qRT-PCR), a Cell Counting Kit-8 (CCK-8), and a Western Blot and plate clone formation test were used to investigate the mechanism by which bta-miR-1296 regulates the proliferation of BMFBs. Target gene prediction results revealed that glutamate-ammonia ligase was a direct target gene by which bta-miR-1296 regulates cell proliferation. It was found that bta-miR-1296 significantly inhibited the proliferation of BMFBs. After BMFBs were transfected with a bta-miR-1296 mimic, mRNA expression in the extracellular matrix (ECM), α-smooth muscle actin (α-SMA), collagen type I alpha 1 chain (COL1α1) and collagen type III alpha 1 chain (COL3α1), and various cell growth factors (basic fibroblast growth factor (bFGF), vascular endothelial growth factor (VEGF), platelet-derived growth factor-BB (PDGF-BB), and transforming growth factor-β1 (TGF-β1)) were down-regulated, and the expressions of α-SMA, COL1α1, COL3α1, phospho-extracellular regulated protein kinases, phospho-protein kinase B, TGF-β1, and phospho-Smad family member3 proteins were inhibited. In conclusion, bta-miR-1296 can inhibit the proliferation of BMFBs and the synthesis of ECM in BMFBs, thus affecting the occurrence and development of mammary fibrosis in dairy cows and laying the foundation for further studies to clarify the regulatory mechanism of mammary fibrosis.
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The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (31772698, 32172814, 31972747, 32002247, 32172937). We thank International Science Editing (http://www.internationalscienceediting.com) for editing this manuscript.
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All authors reviewed the manuscript. R. W., S.L. and J.W. designed the experiments. Y.Y., and T.Y. performed the experiments. Y.Y., J.W. and T.Y. help check the whole manuscript for terminology. Y.Y., T.Y., Z.G., and J.W. performed the data analysis and wrote the manuscript.
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Figure S1
Primary culture, purification and identification of BMFBs. (A) At 6 days of culture, BMFBs were observed growing out of the tissue mass (40×). (B) On the bottom 9 days of culture, pebble-like BMECs began to appear (40×). (C) On day 12 of culture, BMFBs had grown all over the cell vial (40×). (D) DAPI-stained nuclei (blue). (E) Expression of waveform protein in BMFBs (green). (F) Merging of D and E. (PNG 2.00 MB)
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Yang, Y., Yuan, T., Wu, R. et al. The effect of bta-miR-1296 on the proliferation and extracellular matrix synthesis of bovine mammary fibroblasts. In Vitro Cell.Dev.Biol.-Animal 60, 183–194 (2024). https://doi.org/10.1007/s11626-024-00851-0
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DOI: https://doi.org/10.1007/s11626-024-00851-0