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Successful development of squamous cell carcinoma and hyperplasia in RGEN-mediated p27 KO mice after the treatment of DMBA and TPA


To evaluate the carcinogenicity of p27 knockout (KO) mice with RNA-guided endonuclease (RGENs)-mediated p27 mutant exon I gene (IΔ), alterations in the carcinogenic phenotypes including tumor spectrum, tumor suppressor proteins, apoptotic proteins and cell cycle regulators were observed in p27 (IΔ) KO mice after treatment with 7,12-Dimethylbenz[a]anthracene (DMBA) and 12-O-tetradecanoylphorbol-13-acetate (TPA)(DT) for 5 months. The target region (544~571 nt) in exon I of the p27 gene was successfully disrupted in p27 (IΔ) KO mice using the RGEN-induced non-homologous end joining (NHEJ) technique. After DT exposure for 5 months, a few solid tumors (identified as squamous cell carcinoma) developed on the surface of back skin of DT-treated p27 (IΔ) KO mice. Also, squamous cell hyperplasia with chronic inflammation was detected in the skin dermis of DT-treated p27 (IΔ) KO mice, while the Vehicle+p27 (IΔ) KO mice and WT mice maintained their normal histological skin structure. A significant increase was observed in the expression levels of tumor suppressor protein (p53), apoptotic proteins (Bax, Bcl-2 and Caspase-3) and cell-cycle regulator proteins (Cyclin D1, CDK2 and CDK4) in the skin of DT-treated p27 (IΔ) KO mice, although their enhancement ratio was varied. Taken together, the results of the present study suggest that squamous cell carcinoma and hyperplasia of skin tissue can be successfully developed in new p27 (IΔ) KO mice produced by RGEN-induced NHEJ technique following DT exposure for 5 months.


  1. Sherr CJ, Roberts JM. CDK inhibitors: positive and negative regulators of G1-phase progression. Genes Dev 1999; 13(12): 1501–1512.

    CAS  Article  Google Scholar 

  2. Polyak K, Lee MH, Erdjument-Bromage H, Koff A, Roberts JM, Tempst P, Massagué J. Cloning of p27Kip1, a cyclin-dependent kinase inhibitor and a potential mediator of extracellular antimitogenic signals. Cell 1994; 78(1): 59–66.

    CAS  Article  Google Scholar 

  3. Toyoshima H, Hunter T. p27, a novel inhibitor of G1 cyclin-Cdk protein kinase activity, is related to p21. Cell 1994; 78(1): 67–74.

    CAS  Article  Google Scholar 

  4. Mori M, Mimori K, Shiraishi T, Tanaka S, Ueo H, Sugimachi K, Akiyoshi T. p27 expression and gastric carcinoma. Nat Med 1997; 3(6): 593.

    CAS  Article  Google Scholar 

  5. Kim DH, Lee HI, Nam ES, Shin HS, Sohn JH, Park CH, Yoon DS, Song SY, Park YE. Reduced expression of the cell-cycle inhibitor p27Kip1 is associated with progression and lymph node metastasis of gastric carcinoma. Histopathology 2000; 36(3): 245–251.

    CAS  Article  Google Scholar 

  6. Fero ML, Randel E, Gurley KE, Roberts JM, Kemp CJ. The murine gene p27Kip1 is haplo-insufficient for tumour suppression. Nature 1998; 396(6707): 177–180.

    CAS  Article  Google Scholar 

  7. Philipp J, Vo K, Gurley KE, Seidel K, Kemp CJ. Tumor suppression by p27Kip1 and p21Cip1 during chemically induced skin carcinogenesis. Oncogene 1999; 18(33): 4689–4698.

    CAS  Article  Google Scholar 

  8. Philipp-Staheli J, Kim KH, Payne SR, Gurley KE, Liggitt D, Longton G, Kemp CJ. Pathway-specific tumor suppression: Reduction of p27 accelerates gastrointestinal tumorigenesis in Apc mutant mice, but not in Smad3 mutant mice. Cancer cell 2002; 1(4): 355–368.

    Article  Google Scholar 

  9. Ogawa K, Murasaki T, Sugiura S, Nakanishi M, Shirai T. Organ differences in the impact of p27kip1 deficiency on carcinogenesis induced by N-methyl-N-nitrosourea. J Appl Toxicol 2013; 33(6): 471–479.

    CAS  Article  Google Scholar 

  10. Hikosaka A, Ogawa K, Sugiura S, Asamoto M, Takeshita F, Sato SY, Nakanishi M, Kohri K, Shirai T. Susceptibility of p27kip1 knockout mice to urinary bladder carcinogenesis induced by N-butyl-N-(4-hydroxybutyl)nitrosamine may not simply be due to enhanced proliferation. Int J Cancer 2008; 122(6): 1222–1228.

    CAS  Article  Google Scholar 

  11. Ellis FH Jr, Xu X, Kulke MH, LoCicero J 3rd, Loda M. Malignant transformation of the esophageal mucosa is enhanced in p27 knockout mice. J Thorac Cardiovasc Surg 2001; 122(4): 809–814.

    Article  Google Scholar 

  12. Guo J, Ma Q, Zhou X, Fan P, Shan T, Miao D. Inactivation of p27kip1 promotes chemical hepatocarcinogenesis through enhancing inflammatory cytokine secretion and STAT3 signaling activation. J Cell Physiol 2013; 228(10): 1967–1976.

    CAS  Article  Google Scholar 

  13. Fero ML, Rivkin M, Tasch M, Porter P, Carow CE, Firpo E, Polyak K, Tsai LH, Broudy V, Perlmutter RM, Kaushansky K, Roberts JM. A syndrome of multiorgan hyperplasia with features of gigantism, tumorigenesis, and female sterility in p27Kip1-deficient mice. Cell 1996; 85(5): 733–744.

    CAS  Article  Google Scholar 

  14. Nakayama K, Ishida N, Shirane M, Inomata A, Inoue T, Shishido N, Horii I, Loh DY, Nakayama K. Mice lacking p27Kip1 display increased body size, multiple organ hyperplasia, retinal dysplasia, and pituitary tumors. Cell 1996; 85(5): 707–720.

    CAS  Article  Google Scholar 

  15. Kemp CJ. Animal models of chemical carcinogenesis: driving breakthroughs in cancer research for 100 years. Cold Spring Harb Protoc 2015; 2015(10): 865–874.

    Article  Google Scholar 

  16. Harvey M, McArthur MJ, Montgomery CA Jr, Butel JS, Bradley A, Donehower LA. Spontaneous and carcinogen-induced tumorigenesis in p53-deficient mice. Nat Genet 1993; 5(3): 225–229.

    CAS  Article  Google Scholar 

  17. Kemp CJ, Wheldon T, Balmain A. p53-deficient mice are extremely susceptible to radiation-induced tumorigenesis. Nat Genet 1994; 8(1): 66–69.

    CAS  Article  Google Scholar 

  18. Ziegler A, Jonason AS, Leffell DJ, Simon JA, Sharma HW, Kimmelman J, Remington L, Jacks T, Brash DE. Sunburn and p53 in the onset of skin cancer. Nature 1994; 372(6508): 773–776.

    CAS  Article  Google Scholar 

  19. Kiyokawa H, Kineman RD, Manova-Todorova KO, Soares VC, Hoffman ES, Ono M, Khanam D, Hayday AC, Frohman LA, Koff A. Enhanced growth of mice lacking the cyclin-dependent kinase inhibitor function of p27Kip1. Cell 1996; 85(5): 721–732.

    CAS  Article  Google Scholar 

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Correspondence to Dae Youn Hwang.

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Choi, J.Y., Yun, W.B., Kim, J.E. et al. Successful development of squamous cell carcinoma and hyperplasia in RGEN-mediated p27 KO mice after the treatment of DMBA and TPA. Lab Anim Res 34, 118–125 (2018).

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  • p27
  • tumorigenesis
  • DMBA
  • TPA
  • carcinoma
  • hyperplasia