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Metformin inhibits proliferation of human keratinocytes through a mechanism associated with activation of the MAPK signaling pathway

  • Authors:
    • Weining Li
    • Weiyuan Ma
    • Hua Zhong
    • Wenbin Liu
    • Qing Sun

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  • Published online on: November 19, 2013     https://doi.org/10.3892/etm.2013.1416
  • Pages: 389-392
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Abstract

In the present study, the effects of metformin on the proliferation of human immortalized keratinocytes (HaCaTs) and the underlying mechanisms were investigated. HaCaT cells in the logarithmic growth phase were treated with 50 mM metformin for 24, 48 and 72 h. Cell morphology after 24 h of treatment was observed under a microscope. Cell proliferation was detected using a colorimetric cell proliferation and cytotoxicity assay kit. Western blot analyses were performed to detect the protein phosphorylation levels of adenosine monophosphate‑activated protein kinase (AMPK) and extracellular signal‑related kinase 1/2 (ERK1/2). Metformin treatment resulted in morphological changes of the HaCaT cells. The survival rates of HaCaT cells treated with metformin were 36.18, 12.70 and 10.12% at 24, 48 and 72 h, respectively. As the treatment time extended, the survival rates of HaCaT cells decreased. Western blot analysis results showed that the mean level of phosphorylated (p)‑AMPK in the HaCaT cells without metformin treatment was 2.856±0.323. However, the mean p‑AMPK level following metformin treatment for 24 h increased to 5.198±0.625, indicating a significant difference between these two groups (P<0.05). The mean absorbance ratio of p‑ERK1/2 was 7.550±1.087 for the untreated cells, but the levels in cells following metformin treatment for 24 h increased to 10.430±1.217, indicating a significant difference between the two groups (P<0.05). In conclusion, metformin treatment upregulated the levels of p‑AMPK and p‑ERK1/2 in HaCaT cells, and significantly inhibited HaCaT cell proliferation in vitro by a mechanism associated with activation of the mitogen‑activated protein kinase signaling pathway.
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2014-February
Volume 7 Issue 2

Print ISSN: 1792-0981
Online ISSN:1792-1015

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Spandidos Publications style
Li W, Ma W, Zhong H, Liu W and Sun Q: Metformin inhibits proliferation of human keratinocytes through a mechanism associated with activation of the MAPK signaling pathway. Exp Ther Med 7: 389-392, 2014
APA
Li, W., Ma, W., Zhong, H., Liu, W., & Sun, Q. (2014). Metformin inhibits proliferation of human keratinocytes through a mechanism associated with activation of the MAPK signaling pathway. Experimental and Therapeutic Medicine, 7, 389-392. https://doi.org/10.3892/etm.2013.1416
MLA
Li, W., Ma, W., Zhong, H., Liu, W., Sun, Q."Metformin inhibits proliferation of human keratinocytes through a mechanism associated with activation of the MAPK signaling pathway". Experimental and Therapeutic Medicine 7.2 (2014): 389-392.
Chicago
Li, W., Ma, W., Zhong, H., Liu, W., Sun, Q."Metformin inhibits proliferation of human keratinocytes through a mechanism associated with activation of the MAPK signaling pathway". Experimental and Therapeutic Medicine 7, no. 2 (2014): 389-392. https://doi.org/10.3892/etm.2013.1416