생명과학회지 (Journal of Life Science)

  • 제22권1호
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  • Pages.87-91
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  • 2012
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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옥수수 뿌리에서 굴중성 반응과 에틸렌 생성에 미치는 Phorbol 12-myristate 13-acetate 조절 작용

Regulation of Phorbol 12-Myristate 13-Acetate in the Gravitropic Response and Ethylene Production in Primary Roots of Maize

  • Jeong, Yun-Ho (Department of Biological Sciences, Andong National University) ;
  • Kim, Jong-Sik (Department of Biological Sciences, Andong National University) ;
  • Lee, Kon-Joo (Department of Biological Sciences, Andong National University) ;
  • Kim, Soon-Young (Department of Biological Sciences, Andong National University)
  • 투고 : 2011.11.08
  • 심사 : 2011.12.06
  • 발행 : 2012.01.30
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초록

암을 유발하는 phorbol ester로 알려진 Phorbol 12-myristate 13-acetate (PMA)는 동물세포에서 신호전달 효소의 하나인 protein kinase C (PKC)를 활성화시킨다. 본 연구에서는 옥수수 일차뿌리에서 PMA가 에틸렌 생성을 통하여 굴중성 반응을 조절하는 효과를 연구하였다. PMA는 8시간 동안 $10^{-6}$ M과 $10^{-4}$ M에서 농도 의존적으로 뿌리 생장과 굴중성 반응을 촉진시켰다. 이러한 촉진 효과는 PKC의 억제제인 staurosporine (STA)에 의해 상쇄되었다. 이 결과는 굴중성 반응이 신호전달 체계에 관여하는 protein kinase C를 통하여 조절될 가능성을 제시하고 있다. 식물호르몬인 에틸렌도 뿌리 생장과 굴중성 반응에 중요한 역할을 한다고 알려져 있다. 에틸렌 생성은 $10^{-6}$ M과 $10^{-4}$ M PMA에 의하여 각각 26%와 37% 증가하였다. PMA는 또한 ACC synthase (ACS) 활성을 촉진시켰다. 또한 이 증가 효과는 STA에 의하여 상쇄되었다. 이 결과는 옥수수 뿌리에서 굴중성 반응은 에틸렌 생성을 거쳐 protein kinase를 통하여 조절될 가능성을 제시하고 있다.

Phorbol 12-myristate 13-acetate (PMA), a known tumor-promoting phorbol ester, activates the signal transduction enzyme protein kinase C (PKC) in animal cells. We investigated the effect of PMA on the regulation of gravitropism via ethylene production in primary roots of maize. PMA stimulated root growth and the gravitropic response in a concentration-dependent manner at $10^{-6}$ M and $10^{-4}$ M over 8 hrs. These effects were prevented by treatment with staurosporine (STA), a potent inhibitor of PKC. These results support the possibility that the gravitropic response might be regulated through protein kinases that are involved in the signal transduction system. Ethylene is known to play a role in the regulation of root growth and gravitropism. Ethylene production was increased by about 26% and 37% of the control rate in response to $10^{-6}$ M and $10^{-4}$ M PMA, respectively. PMA also stimulated the activity of ACC synthase (ACS), which converts the S-adenosyl-L-methionine (AdoMet) to 1-aminocyclopropane-1-carboxylic acid (ACC) in the ethylene production pathway. These effects on ethylene production were also prevented by STA treatment. These results suggest that the root gravitropic response in maize is regulated through protein kinases via ethylene production.

키워드

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