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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 1997 Jan;88(1):18–25. doi: 10.1111/j.1349-7006.1997.tb00296.x

Overexpression of Cyclin D1 in Rat Esophageal Carcinogenesis Model

Emile M Youssef 1,✉, Tadayoshi Hasuma 2, Yoshihiro Morishima 2, Nobuyasu Takada 1, Harushi Osugi 3, Masayuki Higashino 3, Shuzo Otani 2, Shoji Fukushima 1
PMCID: PMC5921247  PMID: 9045891

Abstract

Overexpression of cyclin D1 in human esophageal carcinomas has been well documented. The aim of the present study was to assess the expression of cyclin D1 in different types of esophageal epithelial lesions induced by N‐nitrosomethylbenzylamine (NMBA) in rats. A total of 30 rats received s.c.‐injections, five times/week, of 1.0 mg/kg NMBA for a period of 5 weeks followed by the same dose once per week for another 10 weeks. An additional 15 rats were given saline and used as controls to provide normal epithelium. The tumor incidence was 100% at the termination point of 21 weeks. Seventeen rats (57%) showed nuclear staining for cyclin D1, with a great variation in the intensity, as demonstrated by using an immunohistochemical technique. The cyclin D1 positive indices were in the range of 0% to 60% of the individual cells. Negligible staining was observed for normal esophageal epithelium, with a minimal increase in hyperplastic and dysplastic lesions. A significant elevation of cyclin D1 levels was observed in tumors. However, no significant differences were found between papillomas and carcinomas. The immunohistochemical results were confirmed by western blotting analysis. Tumors, papillomas and carcinomas overexpressing cyclin D1 had elevated proliferating cell nuclear antigen (PCNA) indices (P<0.05). The correlation coefficient of overexpressions of PCNA and cyclin D1 was r=0.7 for papillomas, but only r=0.3 for carcinomas. The study thus provides strong evidence of relatively early Overexpression of cyclin D1 during tumorigenesis in the present rat esophageal model. Cyclin D1 expression is not simply a direct consequence of increase cell proliferation.

Keywords: Cyclin Dl, Rat, Esophageal carcinogenesis

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