Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Protective Effect of Glycoprotein Isolated from Cudrania tricuspidata on Liver in $CCl_4$-treated A/J Mice

생쥐에 있어서 꾸지뽕 당단백질의 간보호 효과

  • Joo, Heon-Yeong (Molecular Biochemistry Laboratory, Biotechnology Research Institute, Chonnam National University) ;
  • Lim, Kye-Taek (Molecular Biochemistry Laboratory, Biotechnology Research Institute, Chonnam National University)
  • 주헌영 (전남대학교 생명공학연구소) ;
  • 임계택 (전남대학교 생명공학연구소)
  • Published : 2009.02.28
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Abstract

This study aimed to determine whether or not glycoprotein isolated from Cudrania tricuspidata Bureau fruit(CTB glycoprotein) exerts a hepatoprotective effect on liver injury induced by the administration of carbon tetrachloride($CCl_4$, 1.0mL/kg) to A/J mice. Following the administration of CTB glycoprotein(0-20mg/kg), the activities of antioxidant enzymes (superoxide dismutase(SOD), catalase(CAT), and glutathione peroxidase(GPx)), and the quantities of measured thiobarbituric acid reactive substances(TBARS), lactate dehydrogenase(LDH), and nitric oxide(NO) were evaluated from the murine liver tissues and plasma. Additionally, the activity of nuclear factor-kappa B(NF-${\kappa}B$) was assessed after pretreatment with $CCl_4$. When the mice were treated with $CCl_4$ alone, the activities of antioxidative enzymes reduced but amounts of TBARS, LDH, and NO increased. However, the results of treatment with CTB glycoprotein(10 and 20 mg/kg) revealed significantly increased activities of antioxidant enzymes(SOD, CAT, and GPx), as compared with $CCl_4$ alone. On the other hand, the result showed significant diminutions of the quantities of TBARS, LDH, and NO after treatment with CTB glycoprotein(10 and 20 mg/kg), as compared to $CCl_4$ alone. The activity of NF-${\kappa}B$ also declined after pretreatment with CTB glycoprotein, as compared with $CCl_4$ treatment alone. Thus, it is suggested that the CTB glycoprotein exerts a protective effect against $CCl_4$-induced liver injury in A/J mice.

꾸지뽕 당단백질이 간의 조직에 존재하는 항산화계 해독효소의 활성을 증가시켜서 $CCl_4$로 유도된 간독성화 과정에서 생성된 ROS에 의해 야기되는 산화적 스트레스를 억제하는 scavenger로서 기능을 가지고 있는 것으로 분석된다. 또한 혈청 중 LDH 활성증가는 간 및 기타조직의 질환 및 악성 종양 등에서 나타나는 소견으로 LDH를 내포한 조직이 파괴될 때 혈액으로 흘러나와 혈중 LDH가 상승하며, 혈액 중 지질과산화 반응은 생체조직막의 다가불포화지방산 유리기에 의해 산화적 분해를 일으키는 지표로 사용되는 TBARS의 수치, DNA 염기의 deamination 등을 유도함으로써, 유전자의 돌연변이(mutagenesis)로 인한 세포독성을 일으키는 NO 등의 수치가 유의적인 수준으로 억제될 뿐만 아니라, 염증 매개시 단백질인 NF-kB(p50)을 억제함으로써 $CCl_4$에 의한 간독성 과정에서 촉진된 염증 신호전달기전을 억제할 수 있었다. 따라서 꾸지뽕 당단백질은 탁월한 천연 항산화제로서 간의 독성 및 염증 반응을 억제하는 것으로 실험결과 분석된다.

Keywords

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