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In order to investigate the effect of sequence-specific small interfering RNA on suppressing cyclin D1 expression and proliferation and cell cycle and expression of G1 phase regulators of fibroblasts derived from keloid, the plasmid expression vector of siRNA targeted against cyclin D1 was constructed and transfected into fibroblasts with Lipofectamine TM2000.The changes of cyclin D1 expression were detected by fluorescent quantitative PCR(FQ-PCR), semi-quantitative RT-PCR.The effect of sequence-specific small interfering RNA in suppressing the proliferation of fibroblasts was detected by MTT assay.Flow cytometry were used for evaluation of cell cycle.The expression of cyclin D1, CDK4, pRb and P16 was detected by immunohistochemical method.