Radiation Augments a Sequential Program of Differentiation in PKC Inhibitor- pretreated Mouse Epidermal Cells

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  • YI MIN-JEONG
    Laboratory of Radiation Effect, Korea Cancer Center Hospital Department of Food and Microbial Technology, Seoul Women's University
  • BAE IN-HWA
    Laboratory of Radiation Effect, Korea Cancer Center Hospital
  • KIM TAE-HWAN
    Laboratory of Radiation Effect, Korea Cancer Center Hospital
  • LEE SU-JAE
    Laboratory of Radiation Effect, Korea Cancer Center Hospital
  • LEE YUN-SIL
    Laboratory of Radiation Effect, Korea Cancer Center Hospital
  • CHO CHUL-KOO
    Laboratory of Radiation Effect, Korea Cancer Center Hospital

Bibliographic Information

Published
1999
Resource Type
journal article
DOI
  • 10.1269/jrr.40.273
Publisher
Journal of Radiation Research Editorial Committee

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The aim of this study was to determine whether γ-rays affect differentiation in mouse epidermal cells. After a pre-treatment with the PKC inhibitor staurosporin (STS) or 1-(5-isoquinolinesulfomyl)-2-methylpiperazine (H7), γ-rays were irradiated with or without an elevation of 0.12 mM Ca2+ and expressions of differentiation markers and each PKC isozyme were examined in normal primary and v-rasHa transformed mouse keratinocytes. Gamma-rays induced the expressions of differentiation markers of keratin 1 and 10 (K1 and 10), filaggrin, loricrin and SPR-1 in normal keratinocytes when the Ca2+ concentration was increased, and these phenomena were augmented in H7 pretreated cells. Similar results were obtained in STS pretreated cells; in this case, γ-rays enhanced the expressions of the differentiation markers even without an elevated Ca2+ concentration. In v-rasHa transformed cells, γ-rays induced the expression of differentiation markers not only at 0.05 mM Ca2+, but in 0.12 mM Ca2+-shifted cells, and in H7 pretreated cells, these phenomena were augmented. The translocation of PKCα to the particulate fraction was seen in H7 pretreated normal keratinocytes. Radiation also induced PKCα expression in STS pretreated cells, independent of Ca2+-shift, as well as altered expressions of PKC δ and -η, while expressions of PKCα, -δ, -ε, and -η were enhanced in v-rasHa transformed cells. In conclusion, γ-rays augmented the expressions of both spinous and granular differentiation markers in normal and v-ras Ha transformed keratinocytes and this effect was augmented when PKC inhibitors were used, which may be mediated by the cellular redistribution of PKC isozymes.

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