Growth inhibition of human breast carcinoma cells by overexpression of regulator of G-protein signaling 4

  • Authors:
    • Hyun‑Jung Park
    • Seung‑Hyun Kim
    • Dong‑Oh Moon
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  • Published online on: April 7, 2017     https://doi.org/10.3892/ol.2017.6009
  • Pages: 4357-4363
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Abstract

Breast cancer remains the second largest cause of mortality in women with cancer and does not respond well to conventional therapies. Regulator of G‑protein signaling 4 (RGS4) is a GTPase‑activating protein of the heterotrimeric Gq and Gi proteins. Altered levels of RGS4 are reportedly linked with several human diseases, including cancer. The present study investigated whether overexpression of RGS4 inhibited the growth of human breast cancer cells. Protein expression was investigated by western blot analysis. Cell viability and apoptosis were analyzed by MTT assay and flow cytometric analysis, respectively. Cell cycle analysis was performed using propidium iodide staining in order to examine the anti‑proliferative function of increased RGS4 levels. Next, changes in the expression levels of G2/M cell cycle‑related proteins were examined. Overexpression of RGS4 led to the upregulation of phosphorylayed (p)‑Ser216 cell division cycle (Cdc)25C and p‑Tyr15 Cdc2. Importantly, MG132‑induced proteasome blockade prevented degradation of RGS4. Suppression of proliferation was associated with G2/M‑phase cell cycle arrest. Furthermore, enhanced endogenous RGS4 protein levels significantly inhibited breast cancer cell growth, which was reversed by a pharmacological inhibitor of RGS4. Taken together, these results suggest that overexpression of RGS4 in human breast cancer cells by molecular means may offer a potential therapeutic approach.
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June-2017
Volume 13 Issue 6

Print ISSN: 1792-1074
Online ISSN:1792-1082

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Spandidos Publications style
Park HJ, Kim SH and Moon DO: Growth inhibition of human breast carcinoma cells by overexpression of regulator of G-protein signaling 4. Oncol Lett 13: 4357-4363, 2017
APA
Park, H., Kim, S., & Moon, D. (2017). Growth inhibition of human breast carcinoma cells by overexpression of regulator of G-protein signaling 4. Oncology Letters, 13, 4357-4363. https://doi.org/10.3892/ol.2017.6009
MLA
Park, H., Kim, S., Moon, D."Growth inhibition of human breast carcinoma cells by overexpression of regulator of G-protein signaling 4". Oncology Letters 13.6 (2017): 4357-4363.
Chicago
Park, H., Kim, S., Moon, D."Growth inhibition of human breast carcinoma cells by overexpression of regulator of G-protein signaling 4". Oncology Letters 13, no. 6 (2017): 4357-4363. https://doi.org/10.3892/ol.2017.6009