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International Journal of Molecular Medicine
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Article

p57KIP2‑mediated inhibition of human trophoblast apoptosis and promotion of invasion in vitro

  • Authors:
    • Guo‑Qian He
    • Guang‑Yu Liu
    • Wen‑Ming Xu
    • Hui‑Juan Liao
    • Xing‑Hui Liu
    • Guo‑Lin He
  • View Affiliations / Copyright

    Affiliations: Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
  • Pages: 281-290
    |
    Published online on: April 25, 2019
       https://doi.org/10.3892/ijmm.2019.4175
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Abstract

Placental hypoxia serves a role in the early stages of normal pregnancy and is involved in the pathophysiology of preeclampsia. Previously, it was suggested that p57kinase inhibitory protein (KIP)2 regulates the cell cycle during embryogenesis and apoptosis. Recent evidence has indicated that p57KIP2 is increased in preeclamptic placentas and absence of p57KIP2 induces preeclampsia‑type symptoms in rats. However, effects of p57KIP2 on apoptosis under hypoxic conditions remain to be elucidated. In the present study, HTR‑8/SVneo trophoblasts were cultured under hypoxic conditions (2% O2). Knockdown using small interfering (si)RNA and overexpression of p57KIP2 were utilized to explore the biological function of p57KIP2 in apoptosis and cell function in vitro. Furthermore, expression of p57KIP2 and apoptosis were evaluated by western blotting, flow cytometry and TUNEL assays, and the response of trophoblasts to hypoxia and the role of p57KIP2 in trophoblast migration and invasion was assessed. The role of p57KIP2 in the JNK signaling pathway in HTR‑8/SVneo trophoblasts was further studies. In vitro, protein expression of p57KIP2 was increased in HTR‑8/SVneo cells exposed to 2% O2. Exogenous p57KIP2 overexpression significantly decreased the expression of pro‑apoptosis proteins, including p53, Bax and cleaved caspase3, under hypoxic conditions for 24 h. In addition, knockdown of p57KIP2 increased the response to apoptosis following hypoxia for 24 h. The present study revealed that overexpression of p57KIP2 decreased the levels of phosphorylated‑JNK. JNK inhibitor treatment combined with the overexpression of p57KIP2 significantly decreased the levels of apoptosis and increased cell invasion and migration. Taken together, p57KIP2 knockdown significantly increased apoptosis in HTR‑8/SVneo cells exposed to 2% O2, whereas overexpression of p57KIP2 had opposite effects, mediated by the JNK/stress activated protein kinase (SAPK) signaling pathway. The results indicated that hypoxia‑induced expression of p57KIP2 promoted trophoblast migration and invasion by mediating the JNK/SAPK signaling pathway, which is crucial during placentation. These results may provide a novel molecular mechanism to understand the involvement of p57KIP2 in the pathogenesis of preeclampsia.
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Copy and paste a formatted citation
Spandidos Publications style
He GQ, Liu GY, Xu WM, Liao HJ, Liu XH and He GL: p57KIP2‑mediated inhibition of human trophoblast apoptosis and promotion of invasion in vitro. Int J Mol Med 44: 281-290, 2019.
APA
He, G., Liu, G., Xu, W., Liao, H., Liu, X., & He, G. (2019). p57KIP2‑mediated inhibition of human trophoblast apoptosis and promotion of invasion in vitro. International Journal of Molecular Medicine, 44, 281-290. https://doi.org/10.3892/ijmm.2019.4175
MLA
He, G., Liu, G., Xu, W., Liao, H., Liu, X., He, G."p57KIP2‑mediated inhibition of human trophoblast apoptosis and promotion of invasion in vitro". International Journal of Molecular Medicine 44.1 (2019): 281-290.
Chicago
He, G., Liu, G., Xu, W., Liao, H., Liu, X., He, G."p57KIP2‑mediated inhibition of human trophoblast apoptosis and promotion of invasion in vitro". International Journal of Molecular Medicine 44, no. 1 (2019): 281-290. https://doi.org/10.3892/ijmm.2019.4175
Copy and paste a formatted citation
x
Spandidos Publications style
He GQ, Liu GY, Xu WM, Liao HJ, Liu XH and He GL: p57KIP2‑mediated inhibition of human trophoblast apoptosis and promotion of invasion in vitro. Int J Mol Med 44: 281-290, 2019.
APA
He, G., Liu, G., Xu, W., Liao, H., Liu, X., & He, G. (2019). p57KIP2‑mediated inhibition of human trophoblast apoptosis and promotion of invasion in vitro. International Journal of Molecular Medicine, 44, 281-290. https://doi.org/10.3892/ijmm.2019.4175
MLA
He, G., Liu, G., Xu, W., Liao, H., Liu, X., He, G."p57KIP2‑mediated inhibition of human trophoblast apoptosis and promotion of invasion in vitro". International Journal of Molecular Medicine 44.1 (2019): 281-290.
Chicago
He, G., Liu, G., Xu, W., Liao, H., Liu, X., He, G."p57KIP2‑mediated inhibition of human trophoblast apoptosis and promotion of invasion in vitro". International Journal of Molecular Medicine 44, no. 1 (2019): 281-290. https://doi.org/10.3892/ijmm.2019.4175
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