Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Cytotoxicities of Hydrolyzed Crude Laminaran from Eisenia bicyclis on the SNU-1, HeLa and SW Cells

대황으로부터 추출한 crude laminaran 가수분해물의 암 세포독성

  • Published : 2006.12.31
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Abstract

We investigated the effects on the cytotoxicity against several cancer cells of the hydrolysis and molecular weight fractionation of crude laminaran from E. bicyclis, a brown seaweed collected from Uleung island in Korea, was extracted with boiling water and then crude laminaran was prepared by ethanol precipitation of extract obtained after elimination of calcium alginate by calcium chloride. Crude laminaran was hydrolyzed by enzyme (Econase CE), acid (0.1 N HCl) and autoclaving ($121^{\circ}C$, 180 min), and the molecular weight fractions by ultrafiltration to generate molecular weight fractions. Total sugar and sulfate contents of hydrolyzed laminaran were 72.3 and 3.5% (enzyme hydrolysate), 68.5 and 3.0% (acid hydrolysate), 70.2 and 3.2% (autoclaved), and monosaccharides of which consisted of glucose (74.7-78.5%), mannose (9.9-11.5%), galactose (8.5-9.6%) and fucose (3.1-4.5%), respectively. When the cytotoxicity of hydrolyzed laminaran on SNU-1, HeLa and SW cells was evaluated by MTT assay, growth-inhibitory activity of the enzyme hydrolysate against cancer cells was higher than that of acid hydrolysate or autoclaved laminaran. Furthermore, the fraction at a molecular weight range of 10 to 50 kDa revealed higher anti-proliferative activities. The $IC_{50}$ values of 10-50 kDa fraction at a molecular weight range of 10 to 50 kDa revealed higher anti-proliferative activities. The $IC_{50}$ values of 10-50 kDa fractions on SNU-1, HeLa and SW cells were 60.4, 58.6 and 53.9 ${\mu}g/mL$ for enzymatic hydrolysate, 75.6, 73.5 and 77.4 ${\mu}g/mL$ for acid hydrolysate, and 61.7, 68.2 and 60.8 ${\mu}g/mL$ for autoclaved, respectively.

E. bicyclis 열수추출물에서 얻은 crude laminaran의 암 세포독성을 증진시키기 위하여 효소 및 산 가수분해와 고온가압처리에 의한 저분자화를 시도하였으며, 분자량 수준별 위암(SNU-1), 자궁암(HeLa) 및 대장암(SW) 세포주에 대한 세포독성 효과를 알아보았다. 저분자화한 crude laminaran의 총당 및 황산기 함량은 가수분해 방법에 따라 각각 72.3 및 3.5%(효소가수분해), 68.5 및 3.0%(산가수분해), 70.2 및 3.2%(고온가압처리) 수준이었으며, 각 가수분해물의 구성당 조성은 glucose가 78.5, 75.7 및 74.7% 수준으로서 주요 성분이었으며 mannose가 각각 9.9, 10.6 및 11.5%, galactose가 각각 8.5, 9.2 및 9.6%, 그리고 fucose가 각각 3.1, 4.5 및 4.2% 수준으로 함유되어 있었다. 위암, 자궁암 및 대장암 세포주를 대상으로 한 저분자화 수식 laminaran의 세포독성을 MTT assey법으로 조사한 결과 10kDa 이상의 분획에서 높은 세포독성을 나타내었으며, 특히 분자량 50-10 kDa에서 $IC_{50}$ 값은 효소적 가수분해시 60.4, 58.6 및 53.9 ${\mu}g/mL$, 산 가수분해시 75.6, 73.5 및 77.4 ${\mu}g/mL$, 고온가압처리시 61.7, 68.2 및 60.8 ${\mu}g/mL$으로 다른 분획물에 비해 저농도에서 세포독성이 높게 나타났다. 이상의 결과로 미루어 가수분해 처리한 crude laminaran은 분자량 10,000 dalton 이상에서 세포독성이 높았으며, 가수분해 방법에 따른 laminaran의 세포독성에 미치는 영향은 효소적 가수분해가 가장 높았고 그 다음으로 고온가압처리 및 산 가수분해 순으로 높게 나타났다.

Keywords

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