Loss of p16INK4 expression by methylation is associated with lifespan extension of human mammary epithelial cells.

Abstract:

:Inactivation of p16INK4 tumor suppressor gene function is frequently observed in breast cancer. We examined p16INK4 expression in human mammary epithelial cell (HMEC) cultures established from four normal donors. Normal HMECs divide a limited number of times before proliferation ceases in a state referred to as selection (or M0). The cell subpopulation that emerges spontaneously from selection undergoes a further limited period of proliferation before senescence. By immunofluorescence and Western blot analysis of four independent cultures, we have shown loss of p16INK4 expression in postselection HMECs. In contrast, p16INK4 was present in both early and late passage fibroblasts from the same individuals. Bisulfite genomic sequencing revealed extensive methylation of the p16INK4 CpG island in post- but not preselection cells. Thus, the extended period of growth observed in postselection HMECs is associated with hypermethylation of the p16INK4 CpG island and loss of p16INK4 expression. Although postselection HMECs are widely considered to be normal, these data indicate that they have sustained an epigenetic alteration.

journal_name

Cancer Res

journal_title

Cancer research

authors

Huschtscha LI,Noble JR,Neumann AA,Moy EL,Barry P,Melki JR,Clark SJ,Reddel RR

subject

Has Abstract

pub_date

1998-08-15 00:00:00

pages

3508-12

issue

16

eissn

0008-5472

issn

1538-7445

journal_volume

58

pub_type

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