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- Title
Inhibition of Bcl-x<sub>L</sub> expression sensitizes normal human keratinocytes and epithelial cells to apoptotic stimuli.
- Authors
Taylor, Jennifer K; Zhang, Qing Qing; Monia, Brett P; Marcusson, Eric G; Dean, Nicholas M
- Abstract
The epidermis is continually exposed to harmful mutagens that have the potential to cause DNA damage. To protect the skin from accumulating mutated cells, keratinocytes have developed a highly regulated mechanism of eliminating damaged cells through apoptosis. Bcl-xL is a well-described cell survival protein that when overexpressed in skin can protect keratinocytes from UV radiation-induced apoptosis. To begin to unravel the complex mechanisms that keratinocytes use to survive, we wanted to characterize the role of endogenous Bcl-xL in protecting cells from death. In this study, we describe the development and characterization of an antisense inhibitor to Bcl-xL. We show that this inhibitor reduces Bcl-xL RNA and protein in a concentration-dependent, sequence-specific manner. Furthermore, treatment of keratinocytes and epithelial cells with this inhibitor sensitizes these cells to UV-B radiation and cisplatinum treatment-induced apoptosis. Thus, these results offer direct evidence that Bcl-xL is critical in the protection of skin and epithelial cells from apoptosis and provide a basis for the role of Bcl-xL in keratinocyte and epithelial cell survival.
- Subjects
EPIDERMIS; DNA damage; KERATINOCYTES; APOPTOSIS; CELL death
- Publication
Oncogene, 1999, Vol 18, Issue 31, p4495
- ISSN
0950-9232
- Publication type
Article
- DOI
10.1038/sj.onc.1202836