Open Access

Repeated intra-nigrostriatal injection of phorbol myristate acetate induces microglial senescence in adult rats

  • Authors:
    • Lin Liu
    • Xiao‑Guang Luo
    • Hong‑Mei Yu
    • Yu Feng
    • Yan Ren
    • Ya‑Fu Yin
    • Hong Shang
    • Zhi‑Yi He
  • View Affiliations

  • Published online on: October 1, 2015     https://doi.org/10.3892/mmr.2015.4412
  • Pages: 7271-7278
  • Copyright: © Liu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Phorbol myristate acetate (PMA), as a potent tumor promoter, may induce microglial senescence. The present study investigated the effect of PMA infection on microglial senescence. From 58 male Sprague‑Dawley rats, 10 were randomly selected and divided into a PMA injection group, containing five rats (0.5 µg/µl PMA) and a control group, containing five rats (commensurable 0.9% saline). Immunofluorescent staining of Iba‑1 and enzyme‑linked immunosorbent assay analyses of the expression levels of tumor necrosis factor (TNF)‑α and interleukin (IL)‑1 β were performed in these two groups. The remaining 48 rats were randomly divided into the following three groups, each containing 16 rats: Repeated injection control group (commensurable normal saline, once a week for 4 weeks), single PMA injection group (0.5 µg/µl PMA, once in the first week) and repeated injection PMA group (0.5 µg/µl PMA, once a week for 4 weeks). The expression levels of p21, detected using double immunofluorescence staining with Iba‑1, and β‑galactosidase, via double immunohistochemical staining of Iba‑1, were examined in these three groups. The results indicated that a single injection of PMA did not change the microglial morphology and had no significant effects on the expression levels of TNF‑α and IL‑1β, compared with the control group (P>0.05). Following four repeated injections of PMA, the microglia in the substantia nigra presented with features of senescence, characterized by increased expression levels of β-galactosidase (P<0.001) and p21 (P<0.001), compared with the repeated injection control group. In conclusion, repeated intra-nigrostriatal treatment with PMA induced microglial senescence with increased expression levels of β-galactosidase and p21 in the substantia nigra of the rats.
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November-2015
Volume 12 Issue 5

Print ISSN: 1791-2997
Online ISSN:1791-3004

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Spandidos Publications style
Liu L, Luo XG, Yu HM, Feng Y, Ren Y, Yin YF, Shang H and He ZY: Repeated intra-nigrostriatal injection of phorbol myristate acetate induces microglial senescence in adult rats. Mol Med Rep 12: 7271-7278, 2015.
APA
Liu, L., Luo, X., Yu, H., Feng, Y., Ren, Y., Yin, Y. ... He, Z. (2015). Repeated intra-nigrostriatal injection of phorbol myristate acetate induces microglial senescence in adult rats. Molecular Medicine Reports, 12, 7271-7278. https://doi.org/10.3892/mmr.2015.4412
MLA
Liu, L., Luo, X., Yu, H., Feng, Y., Ren, Y., Yin, Y., Shang, H., He, Z."Repeated intra-nigrostriatal injection of phorbol myristate acetate induces microglial senescence in adult rats". Molecular Medicine Reports 12.5 (2015): 7271-7278.
Chicago
Liu, L., Luo, X., Yu, H., Feng, Y., Ren, Y., Yin, Y., Shang, H., He, Z."Repeated intra-nigrostriatal injection of phorbol myristate acetate induces microglial senescence in adult rats". Molecular Medicine Reports 12, no. 5 (2015): 7271-7278. https://doi.org/10.3892/mmr.2015.4412