The feeder layer-mediated extended lifetime of cultured human skin keratinocytes is associated with altered levels of the transcription factors Sp1 and Sp3

Authors: Masson-Gadais, BénédicteFugère, ClaudiaPaquet, ClaudieLeclerc, SteeveLefort, NatalieGermain, LucieGuérin, Sylvain
Abstract: Primary cultured epithelial cells that are used for basic research are often cultivated on plastic whereas those used for clinical purposes are usually cultured in the presence of a feeder layer. Here, we examined the influence of a feeder layer on the expression, affinity and DNA binding ability of the transcription factors, Sp1 and Sp3 in primary cultures of human skin keratinocytes. Co-culturing both newborn and adult skin keratinocytes with lethally irradiated 3T3 cells as a feeder layer contributed to maintain the cell's morphological and growth characteristics and delayed terminal differentiation in vitro. 3T3 also stabilized the DNA binding properties of Sp1 without altering its transcription. Stimulation of Sp1/Sp3 expression appears to be mediated through cell–cell interactions and by factors secreted by 3T3. Thus, we propose that the feeder layer delay terminal differentiation of primary cultured skin keratinocytes by preventing extinction of transcription factors, like Sp1 and Sp3, which play pivotal functions in the cell cycle.
Document Type: Article de recherche
Issue Date: 21 October 2005
Open Access Date: Restricted access
Document version: VoR
This document was published in: Journal of cellular physiology, Vol. 206 (3), 831–842 (2006)
Alternative version: 10.1002/jcp.20529
Collection:Articles publiés dans des revues avec comité de lecture

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