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Primary Culture of Normal Human Mammary Epithelial Cells
(A) Comparison of population doublings of mammary epithelial cells simultaneously cultured from organoids isolated from the same donor in WIT (blue circles) medium on Primaria plates or in MEGM (red squares) medium on regular culture plates. Cells that were cultured in MEGM growth arrested after five to six population doublings; in contrast, cells that were cultured in WIT proliferated past 40 population doublings.
(B) Comparison of p53 and p16 protein expression levels in mammary epithelial cells cultured in WIT medium on Primaria plates versus MEGM medium on regular plates on day 21, immediately prior to growth arrest of cells in MEGM medium. Western blot, β-actin loading control.
(C) Comparison of p16INK4A gene promoter methylation analysis by using DNA methylation-specific PCR primers (U, unmethylated; M, methylated; W, wild-type. p16INK4A promoter DNA-specific primers produce a single PCR product of different sizes with a complete chemical modification reaction; U primers amplify only unmethylated DNA (154 bp), M primers amplify only methylated DNA (145 bp), and W primers amplify only DNA that is not chemically modified, or “wild-type” (142 bp).