Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (9): 2109-2119.doi: 10.11843/j.issn.0366-6964.2020.09.008

• ANIMAL GENETICS AND BREEDING • Previous Articles     Next Articles

Effects of Interference and Overexpression of DDR1 on Proliferation and Apoptosis of Mammary Epithelial Cells in Dairy Cows

HUA Liping, LIU Shuanghang, ZHAO Xinzhe, YE Tingzhu, XIONG Jiajun, YANG Liguo, LIANG Aixin*   

  1. College of Animal Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
  • Received:2020-02-23 Online:2020-09-25 Published:2020-09-25

Abstract: The aim of this study was to investigate the effect of discoidin domain receptor 1 (DDR1) gene on the proliferation, apoptosis and cell cycle of dairy cow mammary epithelial cells through interfering and overexpressing DDR1. The small RNA interference fragment of DDR1 gene and overexpression vector pcDNA3.1-DDR1 were transfected into dairy cow mammary epithelial cells, qRT-PCR and Western blot were used to detect the interference and overexpression efficiency of DDR1; CCK-8 was employed to detect cell proliferation; Flow cytometry was performed to detect the changes of cell cycle and apoptosis (early apoptosis and late apoptosis). qRT-PCR was used to detect the expression of genes related to proliferation and apoptosis. After interfering DDR1 gene in dairy cow mammary epithelial cells, mRNA and protein expression levels of DDR1 were down-regulated by 94% and 30%, respectively; While after overexpressing DDR1 gene, its mRNA and protein expression were up-regulated 68.24 and 1.38 times, respectively. Interfering DDR1 extremely significantly inhibited the proliferation of cells (P<0.01), the ratio of early and late apoptotic cells was extremely significantly increased (P<0.01); the ratio of G1 phase cells in the interference group was extremely significantly increased (P<0.01), and the proportions of S and G2 phase cells were significantly decreased (P<0.01 and P<0.05), which suggested that the cells were blocked in G0/G1 phase. Conversely, overexpression of DDR1 could significantly promote cell proliferation (P<0.05), significantly inhibit the late apoptosis of cells (P<0.05), the proportion of G1 phase cells was extremely significantly decreased (P<0.01), and the proportion of S phase cells was extremely significantly increased (P<0.01), suggesting the enhancement of transition from G1 to S phase. The results of qRT-PCR detection showed that after interfering DDR1, the expressions of BAX and Caspase9 genes were significantly up-regulated (P<0.05), and the expressions of P53 and FAS genes were extremely significantly up-regulated (P<0.01), while the expressions of PCNA and CyclinB1 genes were significantly down-regulated (P<0.05). After overexpression of DDR1, the expressions of Cytc and BAX genes were significantly (P<0.05) and extremely significantly down-regulated(P<0.01), respectively, and the expression of CyclinB1 gene was extremely significantly up-regulated (P<0.01). In summary, DDR1 can regulate the proliferation, apoptosis and cycle of dairy cow mammary epithelial cells, this result will provide a reference for elucidating the molecular mechanism of DDR1 involved in the growth and development of dairy cow mammary epithelial cells.

Key words: discoidin domain receptor 1, dairy cow mammary epithelial cells, cell proliferation, cell cycle, apoptosis

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