Abstract
HaCaT cell line is a widely used model for studying normal human keratinocytes. However, mutations of TP53 gene are typical for this cell line, which have a substantial impact on functions of the encoded protein. The features of this regulatory circuit should be considered when using HaСaT cells for assessment of human skin physiology and pathology in vitro. The study was aimed to assess the features of differentiation realization in HaCaT cells with modulated activity of p53 protein. The expression of p53 was reduced by knockdown of TP53 gene by shRNA (by 2.2 times, p < 0.05), and the elevated concentration of the p53 active forms was achieved via exposure of cells to Nutlin-3a, the MDM2 inhibitor and the major negative regulator of p53. It has been found that regulation of at least three differentiation markers, СASP14, IVL (expression increase by 3.9 and 3.7 times respectively in the p53-knockdown cells, p < 0.05) and TGM1 (twofold expression decrease in the p53-knockdown cells, and 1.7-fold expression increase under exposure to Nutlin-3a, p < 0.05) in HaCaT cells is p53-mediated. The positive correlation has been revealed for expression of TGM1 and p53 that might be realized indirectly via ΔNp63 expression alteration. At the same time, modulation of p53 does not result in significant alterations in expression of cytokeratins.
Highlights
IntroductionMutations of TP53 gene are typical for this cell line, which have a substantial impact on functions of the encoded protein
HaCaT cell line is a widely used model for studying normal human keratinocytes
After two days of growth the culture medium was replaced by the fresh one containing Nutlin-3a at a concentration of 0.2–50 μM, the cells were incubated for 24 hours
Summary
Mutations of TP53 gene are typical for this cell line, which have a substantial impact on functions of the encoded protein The features of this regulatory circuit should be considered when using HaСaT cells for assessment of human skin physiology and pathology in vitro. The study was aimed to assess the features of differentiation realization in HaCaT cells with modulated activity of p53 protein. Установлено, что регуляция как минимум трех маркеров дифференцировки, СASP14, IVL (увеличение экспрессии в 3,9 и 3,7 раза соответственно при нокдауне p53, p < 0,05) и TGM1 (уменьшение экспрессии вдвое при нокдауне TР53 и увеличение в 1,7 раза при воздействии на клетки Nutlin-3a, p < 0,05), в клетках HaCaT зависит от активности p53. Р53 may play a dual role in survival of epidermal cells supporting “healthy” proliferative cells and inducing apoptosis in severely damaged cells [7]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
