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Connexin 43 overexpression induces lung cancer angiogenesis in vitro following phosphorylation at Ser279 in its C‑terminus

  • Authors:
    • Zizi Zhou
    • Wenxiang Chai
    • Yi Liu
    • Yao Liu
    • Huiyu Pan
    • Qiang Wu
    • Xiaoming Zhang

  • View Affiliations

  • Published online on: July 5, 2022     https://doi.org/10.3892/ol.2022.13413
  • Article Number: 293

  • Copyright: © Zhou et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Blocking angiogenesis can inhibit tumor growth and metastasis. However, the mechanism underlying regulation of lung cancer angiogenesis remains unclear. The gap junction protein connexin 43 (Cx43) is implicated in angiogenesis. The aim of the present study was to determine the role of Cx43 in angiogenesis in vitro and its signaling pathways. Human pulmonary microvascular endothelial cells were transfected with Cx43‑targeting siRNA or Cx43‑overexpressing recombinant plasmid vector. Reverse transcription‑quantitative polymerase chain reaction and western blotting were performed to determine Cx43, zonula occludens‑1 (ZO‑1), E‑cadherin, β‑catenin, von Willebrand factor (vWF), and plasminogen activator inhibitor‑1 (PAI‑1) mRNA and protein expression levels, respectively. Tyr265, Ser279, Ser368, and Ser373 phosphorylation levels in the C‑terminus of Cx43 and intracellular and membranal Cx43 contents were determined using western blotting. Additionally, immunofluorescence, tube formation, Cell Counting Kit‑8, and Transwell migration assays were performed. The results revealed that compared with that in the control samples, Cx43, ZO‑1, E‑cadherin, β‑catenin, vWF, and PAI‑1 mRNA and protein expression were significantly increased in the Cx43 overexpression group and significantly decreased in the Cx43‑knockdown group. Moreover, the phosphorylation level of Ser279 as well as cell proliferation and migration rates were markedly increased in the Cx43 overexpression group, and tube formation revealed that the potential of angiogenesis was also increased. Conversely, in the Cx43‑knockdown group, the phosphorylation level of Ser279 and cell proliferation and migration rates were reduced, and the potential of angiogenesis was greatly impaired. Under Cx43 overexpression, membranal Cx43 content was significantly increased, whereas under Cx43 knockdown, it was significantly reduced. Therefore, Cx43 overexpression could induce pulmonary angiogenesis in vitro by promoting cell proliferation and migration and activating ZO‑1, E‑cadherin, β‑catenin, vWF, and PAI‑1. This may be achieved by promoting phosphorylation and activation of the intracellular signal site Ser279 at the C‑terminus of Cx43.
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September-2022
Volume 24 Issue 3

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

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Spandidos Publications style
Zhou Z, Chai W, Liu Y, Liu Y, Pan H, Wu Q and Zhang X: Connexin 43 overexpression induces lung cancer angiogenesis <em>in vitro</em> following phosphorylation at Ser279 in its C‑terminus. Oncol Lett 24: 293, 2022
APA
Zhou, Z., Chai, W., Liu, Y., Liu, Y., Pan, H., Wu, Q., & Zhang, X. (2022). Connexin 43 overexpression induces lung cancer angiogenesis <em>in vitro</em> following phosphorylation at Ser279 in its C‑terminus. Oncology Letters, 24, 293. https://doi.org/10.3892/ol.2022.13413
MLA
Zhou, Z., Chai, W., Liu, Y., Liu, Y., Pan, H., Wu, Q., Zhang, X."Connexin 43 overexpression induces lung cancer angiogenesis <em>in vitro</em> following phosphorylation at Ser279 in its C‑terminus". Oncology Letters 24.3 (2022): 293.
Chicago
Zhou, Z., Chai, W., Liu, Y., Liu, Y., Pan, H., Wu, Q., Zhang, X."Connexin 43 overexpression induces lung cancer angiogenesis <em>in vitro</em> following phosphorylation at Ser279 in its C‑terminus". Oncology Letters 24, no. 3 (2022): 293. https://doi.org/10.3892/ol.2022.13413