Macrophage migration inhibitory factor knockdown inhibit viability and induce apoptosis of PVM/Ms

Zhang,Wenjing; Zheng,Jian; Meng,Juan; Neng,Lingling; Chen,Xiaohua; Qin,Zhaobing

doi:10.3892/mmr.2017.7684

Macrophage migration inhibitory factor knockdown inhibit viability and induce apoptosis of PVM/Ms

Authors:
- Wenjing Zhang
- Jian Zheng
- Juan Meng
- Lingling Neng
- Xiaohua Chen
- Zhaobing Qin
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Affiliations: Department of Otology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450000, P.R. China
Published online on: October 2, 2017 https://doi.org/10.3892/mmr.2017.7684
Pages: 8643-8648
Copyright: © Zhang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Previous studies have suggested that macrophage migration inhibitory factor (MIF) serves an important role in hearing function; however, the underlying mechanism remains unclear. In the present study, perivascular‑resident macrophage‑like melanocytes (PVM/Ms) from the stria vascularis of the lateral cochlear wall in young and aged mice were isolated. The mRNA and protein expression levels of MIF were determined using reverse transcription‑quantitative polymerase chain reaction analysis, and western blotting, respectively. MIF expression was knocked down in vitro and in vivo using small interfering RNA. Cell viability was determined using an MTT assay and cell apoptosis was determined using flow cytometry analysis. The hearing ability was assessed through the auditory brain stem response in vivo. The results of the current study demonstrated that the expression of MIF was significantly downregulated in aged mice compared with in young mice. Furthermore, the viability of PVM/Ms in aged mice was significantly decreased and the number of apoptotic PVM/Ms was significantly increased compared with that in young mice. Further studies demonstrated that the MIF knockdown accentuated hearing loss in young mice as compared with the scramble control group. In addition, the MIF knockdown in PVM/Ms significantly inhibited cell viability and lead to a significant increase in the apoptotic cell number as compared with the control group. In summary, these results revealed that the MIF knockdown significantly accentuates hearing loss in young mice in vivo, and significantly inhibits the viability and induces the apoptosis of PVM/Ms in vitro. Thus, the results of the present study may provide a novel potential therapeutic approach and prevention method for presbycusis.

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