Abstract
Purpose
To test whether transglutaminase 2 (TGase 2) inhibitor GK921 alone reverses renal cell carcinoma (RCC) tumor growth. RCC is resistant to both radiation and chemotherapy, and the prognosis remains poor. Despite the recent therapeutic success of vascular endothelial growth factor inhibition in RCC, approximately one-third of RCC patients develop metastatic disease. The expression of TGase 2 is markedly increased in most RCC cell lines, as well as in clinical samples.
Methods
Previously, we introduced the quinoxaline derivative GK13 as a lead compound for TGase 2 inhibitor. The inhibitory effect of GK13 on TGase 2 was improved in GK921 (3-(phenylethynyl)-2-(2-(pyridin-2-yl)ethoxy)pyrido[3,2-b]pyrazine). GK921 efficacy was tested using sulforhodamine in vitro as well as a xenograft tumor models using ACHN and CAKI-1 RCC cells.
Results
GK921 showed cytotoxicity to RCC (average GI50 in eight RCC cell lines: 0.905 μM). A single treatment with GK921 almost completely reduced tumor growth by stabilizing p53 in the ACHN and CAKI-1 preclinical xenograft tumor models.
Conclusion
TGase 2 inhibitor GK921 abrogates RCC growth in xenograft tumor models, suggesting the possibility of a new therapeutic approach to RCC.
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Abbreviations
- TGase2:
-
Transglutaminase 2
- RCC:
-
Renal cell carcinoma
- SRB:
-
Sulforhodamine B
- I-κBα:
-
NF-κ-B inhibitor α
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Acknowledgments
The study was supported by a research grant (NCC1410280-1) from the National Cancer Center of Korea to S. Y. K. The study was supported by the National R&D Program for Cancer Control (No. 1020050) of Korea to Y. D. G.
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The authors declare no conflict of interest.
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The experiments comply with the current laws of Korea.
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Bo Mi Ku and Se-** Kim have contributed equally to this work.
This article published in the Journal of Cancer Research and Clinical Oncology, Volume 140, Issue 5, pages 757-767, 10.1007/s00432-014-1623-5, has been retracted at the request of the Editor-in-Chief as it is a duplicate of a paper that has already been published in: Cancer Science & Therapy Volume 5, Issue 10, pages 368-376 10.4172/1948-5956.1000228.
At the time the decision for retraction was made this article appeared to be a duplicate publication. When the authors were informed their withdrawal from a previous publication had not been completed, the duplicate article was immediately removed. Retraction of this article has been rescinded as it is the original version.
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Ku, B.M., Kim, SJ., Kim, N. et al. Transglutaminase 2 inhibitor abrogates renal cell carcinoma in xenograft models. J Cancer Res Clin Oncol 140, 757–767 (2014). https://doi.org/10.1007/s00432-014-1623-5
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DOI: https://doi.org/10.1007/s00432-014-1623-5