• Title, Summary, Keyword: NMR:MMPs

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A study of matrix metalloproteinase-9 inhibitor in Hovenia dulcis Thunberg (헛개나무내의 Matrix Metalloproteinase-9 활성 억제제에 관한 연구)

  • Kim, Eun-Ho;Lee, Kwang-Soo
    • Analytical Science and Technology
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    • v.24 no.2
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    • pp.135-141
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    • 2011
  • MMPs (Matrix metalloproteinases) are enzymes playing an important role to turnover and remodel main protein compositions of extracellular matrix. MMP-2 and MMP-9 of MMPs having a catalytic domain which is apart from a hemopexin-like domain part, are different from the other MMPs pertaining fibronectinlike domain close to hemopexin-like domain. It was reported that the development of MMP-9 restrainer can prevent the transfer of liver cancer. In this study, MMP-9 restrainers were extracted and purified from Hovenia dulcis Thunberg. The each fractionary part was examined to investigate the inhibitory effect on MMPs. Three compounds, compound A and B eluted with ethyl acetate (EA) and compound C with methanol, were identified by $^1H$ and $^{13}C$ NMR, GC/MS, and FT-IR. Compound A is considered as a kind of catechine type compound having a benzene ring substituted by hydroxyl and methoxyl groups. Compound B and C are nobiletin type compound pertaining a carbonyl group. Compound A, B and C showed 76%, 66% and 71% of inhibition effect on MMP-9 at 1.0% concentration, respectively. Compound A showed the best inhibition effect on MMP-9.

Inhibition of the expression on MMP-2, 9 and morphological changes via human fibrosarcoma cell line by 6,6'-bieckol from marine alga Ecklonia cava

  • Zhang, Chen;Li, Yong;Shi, Xiujuan;Kim, Se-Kwon
    • BMB Reports
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    • v.43 no.1
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    • pp.62-68
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    • 2010
  • Matrix Metalloproteinases (MMPs) are a family of zinc-endopeptidases which can degrade extracellular matrix (ECM) components and play important roles in a variety of biological and pathological processes. 6,6'-bieckol isolated and characterized from an edible marine brown alga Ecklonia cava (EC), according to the comprehensive spectral analysis of MS and NMR data. Here the influence of 6,6'-bieckol on expressions of MMPs was examined by zymography and western blot analysis via human fibrosarcoma cell line (HT1080). It is shown that 6,6'-bieckol significantly down regulated the expressions of MMP-2 and -9 in dose-dependent manner. The influence of 6,6'-bieckol on the cell viability and cell behavior of HT1080 cells were also investigated, our dates shown that it suppressed the migration and 3D culture in HT1080 cells. Meanwhile, we explored several signal pathways which may contribute to this process, and found the suppressing of MMPs expressions in HT1080 cells might be due to the suppression of NF-${\kappa}B$ signal pathway.

A Study of matrix metalloproteinase-9 inhibitor in root bark of ulmus davidiana planchon (유근피내의 Matrix Metalloproteinase-9 활성 억제제에 관한 연구)

  • Kong, Kwang-Hoon;Han, Kee-Jung;Lee, Kwang-Soo;Cho, Sung-Hye
    • Analytical Science and Technology
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    • v.18 no.2
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    • pp.104-111
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    • 2005
  • Several solvents were used to fractionate an extract obtained from the chapped root bark of Ulmus davidiana Planchon. The each fractionary part was condensed under reduced pressure and then examined to investigate the inhibitory effect on MMPs by modified gelatin zymography, where EA fraction showed the inhibition effect on the activity of MMPs. A compound showing inhibition effect on the MMPs was isolated and purified from EA fraction. Under IR, $^1H$- and $^{13}C$- NMR analyses it is very close to a catethin. This substance showed 48% inhibition effect on measurement of MMP-9 activity at 5 mM and 43% at 10 mM. To verify the effect of this substance on cells, human hepatoma, SK-Hep-1 cells as a cancer model, and Chang liver cells as a normal model were selected. MTT assay was performed to examine the cell viability by treatment of $1{\mu}L/mL$ of the purified substance on cells. The purified substance showed negligible toxicity on human liver cell line.

Quantitation of L-carnitine in plasma by electrospray ionization tandem mass spectrometry (ESI/MS/MS를 이용한 혈장 중 카르니틴 정량분석)

  • Kang, Seung Woo;Kim, Ho Hyun;Lee, Kyung Ryul;Yoon, Hye-Ran
    • Analytical Science and Technology
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    • v.18 no.2
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    • pp.163-167
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    • 2005
  • In this study, a novel analytical method has been developed for the rapid determination of L-carnitine in human plasma using electrospray ionization tandem mass spectrometry. Free carnitine (FC) was analyzed after extraction with 80% methanol and total carnitine (TC) was analyzed after hydrolysis and extraction. Acyl carnitine (AC) was subtracted FC from TC. Analytical methods used multiple reaction monitoring (MRM) scan modes. A correlation coefficient of linear regression ($r^2$) was 0.9995, recovery was 97%, reproducibility was less than 10%, and limit of detection (LOD) was $0.0016{\mu}mol/L$. This method reduced sample preparation time and showed high resolution and good reproducibility compared to that with liquid chromatographic methods. Normal control showed AC was lower than FC. Clinical management of patients with inborn error of metabolism showed FC was lower than AC. Thus, carnitine fraction level was very important to monitoring patients with metabolic disorder.