Expression of cell cycle regulator genes in KB, a human squamous cell carcinoma cell line, after irradiation.

Uno,M; Otsuki,T; Hiratsuka,J; Yoden,E; Aihara,T; Harada,T; Imajo,Y

doi:10.3892/ijo.17.5.947

Nov 2000 Volume 17 Issue 5

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Nov 2000 Volume 17 Issue 5

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Article

Expression of cell cycle regulator genes in KB, a human squamous cell carcinoma cell line, after irradiation.

Authors:
- M Uno
- T Otsuki
- J Hiratsuka
- E Yoden
- T Aihara
- T Harada
- Y Imajo
View Affiliations / Copyright

Affiliations: Department of Radiation Oncology, Kawasaki Medical School, Kurashiki, Okayama 701-0192, Japan. unomako@med.kawasaki-m.ac.jp
Pages: 947-1001
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Published online on: November 1, 2000

https://doi.org/10.3892/ijo.17.5.947
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Abstract

DNA damage induced by irradiation causes overexpression of the p53 gene, and subsequently the upregulation of p53 downstream genes involved in cell cycle modification. Irradiated malignant cells which possess wild-type p53 have been known to undergo G1 arrest due to p21/Cip1/Waf1 upregulation. Other p53 downstream genes related to the modification of the cell cycle such as gadd45 may cause G2 arrest. Many of the genes which regulate the cell cycle progression have been identified, including the G1 phase specific ink4 family of cyclin-dependent kinase inhibitors (CDK-I), another group of CDK-Is, which affect the cyclin-CDK complexes ubiquitously, and S/G2 accelerator genes. The sequential changes in these cell cycle regulator genes after irradiation has not been clarified. We analyzed the appearance of the apoptotic fraction and cell cycle perturbation after irradiation using KB, a human squamous cell carcinoma line derived from oral floor, and examined the alteration of gene expression for cell cycle regulator genes. The KB cells proceeded to undergo apoptosis in a time and dose dependent manner after irradiation and showed G2 arrest accompanied by upregulation of p53, ubiquitous CDK-Is, and S and G2 accelerator genes.

Journals

International Journal of Molecular Medicine

International Journal of Oncology

Molecular Medicine Reports

Oncology Reports

Experimental and Therapeutic Medicine

Oncology Letters

Biomedical Reports

Molecular and Clinical Oncology

World Academy of Sciences Journal

International Journal of Functional Nutrition

International Journal of Epigenetics

Medicine International

Expression of cell cycle regulator genes in KB, a human squamous cell carcinoma cell line, after irradiation.

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Abstract

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