Time filter

Source Type

Woo J.-H.,Korea Ocean Research and Development Institute | Woo J.-H.,Gyeongbuk Institute for Marine Bio Industry | Hwang Y.-O.,Korea Ocean Research and Development Institute | Kang J.-H.,Korea Ocean Research and Development Institute | And 3 more authors.
Journal of Bioscience and Bioengineering | Year: 2010

Previously we reported that an epoxide hydrolase (EHase) from Novosphingobium aromaticivorans could preferentially hydrolyze (R)-styrene oxide. In this study, we demonstrate that the purified NEH could be also effective in chiral resolution of racemic epichlorohydrin (ECH). Particularly, the purified NEH showed excellent hydrolyzing activity toward ECH to complete the reaction at a short period of incubation time. Enantiopure (S)-ECH could be obtained with a high enantiopurity of more than 99.99% enantiomeric excess (ee) and yield of 20.7% (theoretical, 50%). The chiral resolution of the purified NEH toward ECH was not susceptible to substrate inhibition by 500 mM racemic ECH. © 2010 The Society for Biotechnology, Japan.

Kim S.J.,Gyeongbuk Institute for Marine Bio Industry | Chung Y.,Korea University | Lee T.-K.,Maritime and Ocean Engineering Research Institute
Ocean and Polar Research | Year: 2011

The comet assay, also called single-cell electrophoresis (SCGE) assay, is a potential sensitive monitoring tool for DNA damage in cells. The primary objective of this study was to use comet assay to ascertain if the blood cells of flounder (Pleuronichthys olivaceus) and muscle cells of clam (Saxidomus purpurata) are suitable for genotoxicity screening. This was achieved by initially exposing blood and muscle cells under in vitro conditions to the reference genotoxin hydrogen peroxide (H 2O 2); strong correlation between H 2O 2 concentration and comet values were found. Subsequently, the identification of DNA damage in isolated cells from flounder and clam was performed under in vivo exposure to benzo(a)pyrene (BaP) and tributyltin (TBT). Flounder and clam were exposed to different concentrations (1, 10, 50, 100 μg/L) of BaP or TBT for 4 days. Regardless of treated chemicals, blood cells of flounder were more prone to DNA breakage compared to muscle cells of clam. In conclusion, in vivo genotoxicity of BaP and TBT can be biomonitored using the comet assay. This study suggests that flounder and clam do show potential as mediums for monitoring genotoxic damage by comet assay.

Gyeongbuk Institute For Marine Bio Industry | Date: 2012-12-03

Disclosed is a novel compound having biosurfactant activity that is produced by The novelty of the structure of the compound having biosurfactant activity was evaluated using spectroscopy, and it was determined that the biosurfactant produced by the strains has excellent surfactant activity. Active ingredients of the biosurfactant may be used for various purposes, for example, for producing a composition for washing and cleaning agents. Furthermore, they can be used in a variety of industrial fields where chemically synthesized surfactants are used such as medicines, foods, cosmetics, onshore and offshore oil decontamination, degradation of oil and fat in treatment tanks, and the like where chemically synthesized surfactants are used.

Yayeh T.,Kyungpook National University | Yayeh T.,Debre Markos University | Im E.J.,Kyungpook National University | Kwon T.-H.,Gyeongbuk Institute for Marine Bio Industry | And 8 more authors.
International Immunopharmacology | Year: 2014

Eisenia bicyclis is edible brown algae recognized as a rich source of bioactive derivatives mainly phlorotannins reported for their anti-oxidant properties. Of all phlorotannins identified so far, dieckol has shown the most potent effect in anti-inflammatory, radical scavenging and neuroprotective functions. However, whether dieckol up-regulates hemeoxygenase 1 (HO-1) and this mediates its anti-inflammatory effect in murine macrophages remains poorly understood. Dieckol (12.5-50 μM) inhibited nitric oxide production and attenuated inducible nitric oxide synthase, phospho (p)-PI-3 K, p-Akt, p-IKK-α/β, p-IκB-α and nuclear p-NF-κBp65 protein expressions, and NF-κB transcriptional activity in LPS (0.1 μg/ml) stimulated murine macrophages. On the other hand, dieckol up-regulated HO-1which partly mediated its anti-inflammatory effect in murine macrophages. Thus, dieckol appeared to be a potential therapeutic agent against inflammation through HO-1 up-regulation. © 2014 Elsevier B.V.

Paudel U.,Chonbuk National University | Lee Y.-H.,Chonbuk National University | Kwon T.-H.,Gyeongbuk Institute for Marine Bio Industry | Kwon T.-H.,Andong National University | And 4 more authors.
Oral Diseases | Year: 2014

Objectives: The aim of this study was to elucidate the role of 6-6 bieckol (EB1) and pholorofucofuroeckol-A (EB5) from brown seaweed marine algae (Eisenia bicyclis) on lipopolysaccharide (LPS)-induced inflammation in human dental pulp cells (HDPCs). Methods: The cytotoxicity of EB1 and EB5 was examined by MTT assay on LPS-induced human dental pulp cells. Their role on expression of inflammatory, odontogenic, and osteogenic molecules was determined by Western blot analysis. The dentin mineralization was checked by alkaline phosphatase activity. Results: The five compounds from E. bicyclis have different structure with non-cytotoxic in HDPCs. EB1 and EB5 showed anti-inflammatory properties and inhibited phosphorylated-extracellular signal-regulated kinase (p-ERK1/2) and phosphorylated-c-jun N-terminal kinases (p-JNK) without any cytotoxicity. In particular, EB1 inhibited cyclooxygenase-2 (COX-2) and p-ERK1/2 signaling, and EB5 inhibited only p-ERK1/2 signaling but not COX-2. Both compounds inhibited nuclear factor kappa-B (NF-κB) translocation. Furthermore, EB1 and EB5 increased dentinogenic and osteogenic molecules, and dentin mineralized via alkaline phosphatase activity (ALP) in LPS-induced HDPCs. Conclusions: This study elucidates that EB1 and EB5 have different types of anti-inflammatory property and help in dentin formation. Therefore, these compounds derived from marine algae of E. bicyclis may be used as selective therapeutic strategies for pulpitis and oral diseases. © 2014 John Wiley & Sons A/S.

Discover hidden collaborations