Detection of Protein Kinase C Isoenzymes in the Growth of Human Epidermal Keratinocytes by Growth Factors

Growth Factor를 처리한 피부상피세포로부터 Protein Kinase C Isoenzyme의 검출

  • Eun-Young Joo (Department of Biology, Faculty of Natural Science, Kyungsan University) ;
  • Nam-Woo Kim (Department of Biology, Faculty of Natural Science, Kyungsan University)
  • Published : 2000.06.01

Abstract

Subconfluent neonatal human epidermal keratinocytes were treated with a concentration 200 ng/$m\ell$ of human recombinant epidermal growth factor (hrEGF), human recombinant insulin-like growth factor-1 (hrIGF-1), and with a combination of hrEGF and hrIGF-1. Cytoplasmic and membrane-associated proteins were extracted and assayed. Proteins were separated by SDS-PAGE, and subjected to the western blot analysis. In the cytoplasmic fraction, the PKC concentration of keratinocyte treated with hrIGF-1 was higher than the control group, but the concentration of control group was the highest than the others in the membrane fraction. In the cytoplasmic fraction, EGF stimulated PKC-$\beta$II, -$\delta$, -$\theta$, and also stimulated PKC-$\alpha$, -$\beta$I, -$\delta$, -$\Im$ and -$\theta$ in the membrane fraction. IGF-1 stimulated PKC-$\beta$I, -$\Im$ and -$\theta$ in the cytoplasmic, PKC-$\alpha$, -$\beta$I, -$\delta$, -$\Im$, - $\varepsilon$ and -$\theta$ in the membrane. In the cells treated with a combination of EGF and IGF-1, PKC-$\alpha$, -$\beta$I, -$\Im$ and -$\theta$ in the cytoplasmic fraction, PKC-$\alpha$, -$\delta$, -$\Im$, -$\varepsilon$ and -$\theta$ in the membrane fraction were stimulated.

Protein kinase C는 세포의 신호전달계에 관여하는 중요한 조절효소로서 여러 가지 세포의 분화와 증식과도 밀접한 관련이 있다. 신생아의 포피 keratinocyte를 농도 200 ng/ml의 human recombinant epidermal growth factor (hrEGF)와 human recombinant insulin-like growth factor-1 (hrIGF-1) 그리고 hrEGF와 hrIGF-1의 혼합액을 각각 첨가하여 24시간 배양한후 세포질과 세포막의 PKC단백질을 추출하여 그 농도를 측정하고, Western blot analysis를 이 용하여 각 growth factor들의 PKC isoenzyme에 대한 영향을 분석하였다. 세포질의 총 PKC 단백질의 농도는 hrIGF-1을 처리한 keratinocyte에서 가장 높았으며, 세포막에서는 대조군의 단백질 농도가 가장 높게 나타났다. EGF를 처리한 keratinocyte의 세포질에서 는 PKC-$\beta$II, -$\delta$, -$\theta$가 막성분에서는 PKC-$\alpha$, -$\beta$I, -$\delta$, -$\Im$, -$\theta$가 증가하였다. IGF-1을 처리한 군의 세포질성분에는 PKC-$\beta$I, -$\Im$, -$\theta$, 막성분에서는 PKC-$\alpha$, -$\beta$I, -$\delta$, -$\Im$, -$\varepsilon$, -$\theta$가 증가하였다 EGF와 IGF-1의 혼합처리 군에서는, PKC-$\alpha$, -$\beta$I, -$\Im$, -$\theta$이 세포질에서, PKC-$\alpha$, -$\delta$, -$\Im$, -$\varepsilon$, -$\theta$은 세포막에서 증가하였다.

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