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Effect and Mechanism of Vitamin D on Inflammatory Factors and Neutrophil Activity in Preterm Placenta of Rats Induced
Danlin Yang1, Xian Chen1, Bingqing Lv2
1Department of Obstetrics, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, 350001, Fujian Province, China.
To investigate the impact mechanisms of vitamin D on inflammatory factors and neutrophil activity in preterm pregnant rats. 24 pregnant rats were selected as the research objects and randomly divided into control group, LPS group and LPS + VD group, with 8 rats in each group. On the second day of pregnancy, the LPS + VD group was injected intraperitoneally with 50 mg/L vitamin D30.2 mL, and the LPS group and the control group were injected with the same amount of 0.9% NaCl twice a day. On the seventh day of pregnancy, the LPS group and the LPS + VD group were injected with 0.2 mL LPS into the tail vein to establish a preterm labor model induced by infection. The control group was injected with the same amount of physiological saline into the tail vein. Placental tissues from rats in the LPS + VD group and the LPS group were collected, and the expression levels of inflammatory factors TGF-β1, TNF-α, and VDBP were detected by immunohistochemistry. At the same time, serum IL-2 concentration was measured by ELISA and radioimmunoassay, the activity of neutrophils was evaluated by flow cytometry, and the expression of Hippo-YAP signaling pathway protein was detected by Western blot. Compared with the control group, the content of TNF-α, VDBP, and TGF-β1 in placenta in LPS group were higher than that in the control group (P < 5); Compared with the LPS group, the contents of TNF-α, BP and TGF-β1 in the LPS+VD group were significantly reduced,(P < 0.05); Compared with the control group, the serum IL-2 concentration in the LPS group was significantly higher than that in the control group (P < 0.05); Compared with the LPS group, the serum IL-2 concentration in the LPS + VD group decreased significantly (P < 0.05); Compared with the control group, the neutrophil ratio and absolute neutrophil value in the LPS group were higher than those in the control group (P < 0.05); Compared with the LPS group, the neutrophil ratio and absolute value of neutrophils decreased (P < 0.05); compared with the control group, the expression levels of YAP and P-YAP protein in the LPS group increased (P < 0.05); compared with the LPS group, the expression levels of YAP and P-YAP protein in the LPS + VD group decreased (P < 0.05). Vitamin D can improve the immune status of preterm pregnant mice by inhibiting the expression of placental inflammatory factors.
To investigate the impact mechanisms of vitamin D on inflammatory factors and neutrophil activity in preterm pregnant rats. 24 pregnant rats were selected as the research objects and randomly divided into control group, LPS group and LPS + VD group, with 8 rats in each group. On the second day of pregnancy, the LPS + VD group was injected intraperitoneally with 50 mg/L vitamin D30.2 mL, and the LPS group and the control group were injected with the same amount of 0.9% NaCl twice a day. On the seventh day of pregnancy, the LPS group and the LPS + VD group were injected with 0.2 mL LPS into the tail vein to establish a preterm labor model induced by infection. The control group was injected with the same amount of physiological saline into the tail vein. Placental tissues from rats in the LPS + VD group and the LPS group were collected, and the expression levels of inflammatory factors TGF-β1, TNF-α, and VDBP were detected by immunohistochemistry. At the same time, serum IL-2 concentration was measured by ELISA and radioimmunoassay, the activity of neutrophils was evaluated by flow cytometry, and the expression of Hippo-YAP signaling pathway protein was detected by Western blot. Compared with the control group, the content of TNF-α, VDBP, and TGF-β1 in placenta in LPS group were higher than that in the control group (P < 5); Compared with the LPS group, the contents of TNF-α, BP and TGF-β1 in the LPS+VD group were significantly reduced,(P < 0.05); Compared with the control group, the serum IL-2 concentration in the LPS group was significantly higher than that in the control group (P < 0.05); Compared with the LPS group, the serum IL-2 concentration in the LPS + VD group decreased significantly (P < 0.05); Compared with the control group, the neutrophil ratio and absolute neutrophil value in the LPS group were higher than those in the control group (P < 0.05); Compared with the LPS group, the neutrophil ratio and absolute value of neutrophils decreased (P < 0.05); compared with the control group, the expression levels of YAP and P-YAP protein in the LPS group increased (P < 0.05); compared with the LPS group, the expression levels of YAP and P-YAP protein in the LPS + VD group decreased (P < 0.05). Vitamin D can improve the immune status of preterm pregnant mice by inhibiting the expression of placental inflammatory factors.
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