PTK7, a Catalytically Inactive Receptor Tyrosine Kinase, Increases Oncogenic Phenotypes in Xenograft Tumors of Esophageal Squamous Cell Carcinoma KYSE-30 Cells

Won Sik Shin, Mi Kyung Park, Jae Hoon Kim, Si Won Oh, Ji Yun Jang, Ho Lee, Seung Taek Lee

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Abstract

Protein tyrosine kinase 7 (PTK7), a catalytically defective receptor protein tyrosine kinase, is upregulated in tumor tissues and cell lines of esophageal squamous cell carcinoma (ESCC). We showed that PTK7 plays an oncogenic role in various ESCC cell lines. However, its role as an oncogene has not been demonstrated in vivo. Here, we examined the influence of PTK7 on the tumorigenic potential of ESCC KYSE-30 cells, which are known to establish xenograft tumors. Overexpression of PTK7 enhanced the proliferation, adhesion, wound healing, and migration of KYSE-30 cells, and these effects were reversed by the knockdown of PTK7. PTK7 overexpression and knockdown, respectively, increased and decreased the tyrosine phosphorylation of cellular proteins and the phosphorylation of ERK, AKT, and FAK, which are important for cell proliferation, survival, adhesion, and migration. Additionally, PTK7 overexpression and silencing, respectively, increased and decreased the weight, volume, and number of Ki-67-positive proliferating cells in xenograft tumors of KYSE-30 cells. Therefore, we propose that PTK7 plays an important role in the tumorigenesis of ESCC cells in vivo and is a potential therapeutic target for ESCC.

Original languageEnglish
Article number2391
JournalInternational journal of molecular sciences
Volume23
Issue number4
DOIs
Publication statusPublished - 2022 Feb 1

Bibliographical note

Funding Information:
Acknowledgments: W.-S.S. is a recipient of the Yonsei Frontier Laboratory Young Researcher Supporting Program of the Yonsei University Research Fund. J.H.K. and S.W.O. were fellowship awardees of the BK21 FOUR program.

Funding Information:
Funding: This work was supported by grants from the National Cancer Center of Korea (NCC-2010271 and 2110150 to H.L.), the National Research Foundation of Korea (2019M3A9A8065054 to S.-T.L.), and the Korea Drug Development Fund funded by the Ministry of Science and ICT, Ministry of Trade, Industry, and Energy, and Ministry of Health and Welfare of Korea (HN21C1214000021 to S.-T.L.).

Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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