The relationship between nuclear DNA content and the expressions of cyclin D1 and P53 proteins in carcinogenesis of breast carcinoma induced by DMBA in rats / 第三军医大学学报

ABSTRACT

Objective To investigate the interrelation between nuclear DNA content and the expressions of cyclin D1 and P53 in carcinogenesis of breast carcinoma induced by 7,12 dimethylbenz(a)anthracence(DMBA) in rats. Methods Animal model of breast carcinoma was replicated by gastric perfusion of DMBA at 20 mg/100 g. Nuclear DNA content was detected with image analysis instrument and the expressions of cyclin D1 and P53 at every stage of carcinogenesis of breast carcinoma induced by DMBA in rats observed by Sp immunohistochemical staining. Results In mammary gland tissue at grade Ⅰ, grade Ⅱ and grade Ⅲ atypical hyperplasia of breast carcinoma, there was overepression of cyclin D1(3/20, 6/20 and 11/20, respectively). The overexpression of cyclin D1 was detected to be present in grade Ⅰ, grade Ⅱ and grade Ⅲ breast carcinoma (7/9, 1/4 and 0/7, respectively). The overexpression of P53 was detected to be present in grade Ⅰ, grade Ⅱ and grade Ⅲ breast carcinoma (1/9, 1/4 and 6/7, respectively). Conclusion Nuclear DNA content reflects the state of cell proliferation. Cyclin D1 overexpression participates in the carcinogenesis of breast carcinoma, which may be the early event in breast carcinoma. P53 expression is associated with the development of breast carcinoma, which may be the late event in breast carcinoma. The expression of cyclin D1 is negatively correlated with P53 overexpression.