Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effect of Lycopene on the Insulin-like Growth Factor-I Receptor Signaling Pathway in Human Colon Cancer HT-29 Cells

인간의 대장암 HT-29 세포주에서 라이코펜이 Insulin-like Growth Factor-I Receptor Signaling Pathway에 미치는 영향

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  • ;
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  • Frederick Khachik (Dept. of Chemistry & Biochemistry, Joint Institute for Food Safety & Applied Nutrition, University of Maryland) ;
  • 이현숙 (한림대학교 생명과학부 식품영양전공) ;
  • 정재인 (한림대학교 생명과학부 식품영양전공) ;
  • 강영희 (한림대학교 생명과학부 식품영양전공) ;
  • ;
  • 윤정한 (한림대학교 생명과학부 식품영양전공)
  • Published : 2003.04.01
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Abstract

Epidemiological data suggest that lycopene has anticancer activities in humans. Insulin-like growth factor-I receptor (IGF-IR) is a transmembrane tyrosine kinase that mediates the biological actions of IGFs and may play an active role in cancer progression. Because our previous in vitro studies have indicated lycopene inhibits HT-29 cell growth, the aim of this study was to determine whether lycopene induces apoptotic cell death and the inhibitory effect of lycopene on HT-29 cell growth is related to changes in IGF-IR levels and the receptor's intracellular signalling pathways. HT-29 cells were incubated for 4 days in serum-free medium in the presence of 0, 25, 50, or 100 $\mu$M lycopene, and the DNA fragmentation assay was performed. Cells treated with lycopene produced a distinct oligonucleosomal ladder with different sizes of DNA fragments, a typical characteristic of cells undergoing apoptosis. HT-29 cells were cultured for 4 days in serum-free medium in the presence of 0~100 $\mu$M lycopene and IGF-I (10nM) was added for 0~60 minutes immediately prior to lysate preparations. Western blot analysis of total lysates revealed that lycopene decreased the levels of IRS-1, Akt, phosphatidylinositol 3-kinase (PI3K), and IGF-IR $\beta$-subunit, and increased the levels of the IGF-IR precursor dose dependently. Lycopene also decreased IGF-I-induced phosphorylation of IGF-IR$\beta$, IRS-1 and Akt, which were, at least in part, due to decreased expression of these proteins. These results suggest that lycopene induces apoptosis of HT-29 cells by inhibiting IGF-IR signaling thereby interfering with an IGF-II-driven autocrine growth loop, which is known to exist in this cell line.

선행연구에서 라이코펜이 HT-29세포의 증식을 억제하는 것을 관찰하였기 때문에 본 연구는 그 기전을 연구하기 위하여 수행되 었다. 라이코펜이 HT-29 세포의 사멸을 유도하는지 조사하기 위해서 여러 농도의 라이코펜이 포함된 배지에서 세포를 4일 동안 배양하였다. 라이코펜 농도의 증가에 따라 사멸되는 세포에서 나타나는 특징의 하나인 DNA fragmentation이 증가하는 것을 관찰하였다. Western blot을 수행하여 얻은 결과에 의하면 라이코펜이 IGF-IR, IRS-1, PI3K, Akt와 같은 IGF-IR pathway에 속하는 단백질의 수준을 감소시켰다. IGF-IR의 인산화를 유도하기 위해서 라이코펜이 포함된 배지에서 세포를 배양하고 IGF-I을 첨가하여 0, 5, 10, 60분간 배양한 다음 IGF-IR antibody를 이용하여 immunoprecipitation을 수행하였다. 라이코펜은 IGF-I에 의한 IGF-IR, IRS-1의 인산화와 IGF-IR와 PI3K의 결합을 감소하고 인산화된 Akt를 감소시켰다. 이와 같은 IGF-IR signaling의 억제는 이 대장암세포에 존재하는 IGF-II의 autocrine loop을 억제하는 원인이 될 수 있어, 라이코펜의 암세포증식을 억제하는 기전 중의 하나가 될 수 있다. 라이코펜은 토마토와 그 가공품에 많이 존재하는 물질로 자연적인 식사를 통해 많이 섭취할 수 있는 물질이다. 라이코펜의 항암 기전을 밝혀냄으로써 미래 암예방과 치료를 위한 중요한 기능성 영양소를 생산할 수 있는 기초를 마련해줄 수 있을 것으로 기대된다.

Keywords

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