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Cheong, Won-Jo,Go, Joung-Ho,Baik, Yoon-Suk,Kim, Sung-Soon,Nagarajan, Erumaipatty R,Selvapalam, Narayanan,Ko, Young-Ho,Kim, Ki-Moon Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.10
A new chromatographic stationary phase has been prepared by cross polymerization between allylsilica and perallyloxycucurbit[6]uril and characterized by elemental analysis and FT-IR spectroscopy. The double endcapping has been proven to improve the separation efficiency of the cucurbituril-based stationary phase material. The first end-capping was carried out when allylsilica was made. The second end-capping was done as the final step of the whole process, and the use of a mixture of hexamethyldisilazane (HMDS) and trimethylchlorosilane (TMCS) as an end-capping reagent was found better than the use of only HMDS or TMCS. Our stationary phase has shown generally good results in separation of nonpolar and polar analytes. This phase showed even better separation performance than the commercial C18 phase for the case where hostguest chemistry was properly incorporated in solute retention.
Review : Revision and update on clinical practice guideline for Liver cirrhosis
( Ki Tae Suk ),( Soon Koo Baik ),( Jung Hwan Yoon ),( Jae Youn Cheong ),( Yong Han Paik ),( Chang Hyeong Lee ),( Young Seok Kim ),( Jin Woo Lee ),( Dong Joon Kim ),( Sung Won Cho ),( Seong Gyu Hwang ) 대한간학회 2012 Clinical and Molecular Hepatology(대한간학회지) Vol.18 No.1
Original Articles : Clinical features of acute viral hepatitis B in Korea: a multi-center study
( Hye Jin Choi ),( Soon Young Ko ),( Won Hyeok Choe ),( Yeon Seok Seo ),( Ji Hoon Kim ),( Kwan Soo Byun ),( Young Seok Kim ),( Seung Up Kim ),( Soon Koo Baik ),( Jae Youn Cheong ),( Tae Yeob Kim ),( O 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.4
Background/Aims: The incidence of Hepatitis B has significantly declined since the introduction of an HBV vaccination program. The aim of this study was to investigate recent clinical features of acute viral hepatitis B (AVH-B) in Korea. Methods: A total of 2241 patients with acute viral hepatitis were enrolled and their data were collected from nine medical-centers between January 2006 and December 2009. Results: One hundred nineteen (5.3%) of the 2241 were diagnosed as AVH-B. Among 78 patients with AVH-B whose data were analyzed, 50 were male, and the mean age was 38.6 years. In an initial test, mean AST, ALT and total-bilirubin levels were 1296.2 IU/L, 2109.6 IU/L and 9.3 mg/dl, respectively. Positivity frequencies for HBeAg and anti-HBe were 55.1% and 67.9%, respectively, and the mean HBV DNA level was 5.2 log10 copies/ml. The mean length of hospitalization was 11.6 days. During follow-up, AST, ALT and total bilirubin levels were normalized or near-normalized in all patients without serious complications. Sixty-three of 66 (95.4%) patients showed HBsAg loss and 37 (56.1%) patients showed HBsAg seroconversion. Only 3 patients (4.5%) showed persistent hepatitis B viremia. There was no case of death or liver transplantation. Nine patients (11.3%) had received anti-viral agents and their clinical outcomes were not significantly different from those of patients treated without antiviral agents. Conclusions: The prevalence of AVH-B among acute hepatitis patients is relatively low in Korea. AVH-B infection can be cured without complications in almost all patients, regardless of antiviral treatment. (Korean J Hepatol 2011;17:307-312)
β-Glucan Synthetase 2 Activity Upon Callose Formation in the Flower of Arabidopsis thaliana
Kang, Joung Youn,Kim, Young Soon,Cheong, Hyeon Sook,Pyo, Byoung Sik,Hwang, Baik 한국식물학회 1998 Journal of Plant Biology Vol.41 No.2
Callose formation was observed in the pollens during flower development and pollen tube grown in the pistil of A. thaliana. The accumulation of callose occurred in the tetrad in the flower bud and pollen tube. Therefore, the activity of β-glucan synthetase Ⅱ (GS Ⅱ), which is responsible for synthesizing the callose, was measured in the flowers on the same developmental stages. The enzyme activity was increased by about 10% while the level of callose contents was increased by about 70% in tetrads. Then, callose accumulation was increased during pollen tube growth by about 30% higher than the other stages and enzyme activity was detected, 30% more too. These results suggest that callose plays an important role in the growth of pollen and pollen tube by increasing GS Ⅱ activity.
Secretory Profiles and Wound Healing Effects of Human Amniotic Fluid-Derived Mesenchymal Stem Cells
Yoon, Byung Sun,Moon, Jai-Hee,Jun, Eun Kyoung,Kim, Jonggun,Maeng, Isaac,Kim, Jun Sung,Lee, Jung Han,Baik, Cheong Soon,Kim, Aeree,Cho, Kyoung Shik,Lee, Jang Ho,Lee, Hwang Heui,Whang, Kwang Youn,You, Se Mary Ann Liebert 2010 STEM CELLS AND DEVELOPMENT Vol.19 No.6
<P>Recent evidence shows that amniotic fluid (AF) contains multiple cell types derived from the developing fetus, and may represent a novel source of stem cells for cell therapy. In this study, we examined the paracrine factors released by human amniotic fluid-derived mesenchymal stem cells (AF-MSCs) and their ability to accelerate the wound-healing process by stimulating proliferation and migration of dermal fibroblasts. AF-MSCs expressed the typical MSC marker proteins CD13, CD29, and CD44 and differentiated into adipocytes, osteoblasts, and chondrocytes when exposed to the appropriate differentiation media. In addition, AF-MSC-conditioned media (AF-MSC-CM) significantly enhanced proliferation of dermal fibroblasts. Antibody-based protein array and enzyme-linked immunosorbent assay (ELISA) indicated that AF-MSC-CM contains various cytokines and chemokines that are known to be important in normal wound healing, including IL-8, IL-6, TGF-beta, TNFRI, VEGF, and EGF. Application of AF-MSC-CM significantly enhanced wound healing by dermal fibroblasts via the TGF-beta/SMAD2 pathway. Levels of p-SMAD2 were increased by AF-MSC-CM, and both the increase in p-SMAD2 and migration of dermal fibroblasts were blocked by inhibiting the TGF-beta/SMAD2 pathway. Moreover, in a mouse excisional wound model, AF-MSC-CM accelerated wound healing. These data provide the first evidence of the potential for AF-MSC-CM in the treatment of skin wounds.</P>
Differentiation of human labia minora dermis-derived fibroblasts into insulin-producing cells
Bona Kim,Byung Sun Yoon,Jai-Hee Moon,Jonggun Kim,Eun Kyoung Jun,Jung Han Lee,Jun Sung Kim,Cheong Soon Baik,김애리,황광연,유승권 생화학분자생물학회 2012 Experimental and molecular medicine Vol.44 No.1
Recent evidence has suggested that human skin fibroblasts may represent a novel source of therapeutic stem cells. In this study, we report a 3-stage method to induce the differentiation of skin fibroblasts into insulin-producing cells (IPCs). In stage 1, we establish the isolation, expansion and characterization of mesenchymal stem cells from human labia minora dermis-derived fibroblasts (hLMDFs) (stage 1: MSC expansion). hLMDFs express the typical mesenchymal stem cell marker proteins and can differentiate into adipocytes,osteoblasts, chondrocytes or muscle cells. In stage 2, DMEM/F12 serum-free medium with ITS mix (insulin, transferrin, and selenite) is used to induce differentiation of hLMDFs into endoderm-like cells, as determined by the expression of the endoderm markers Sox17, Foxa2, and PDX1 (stage 2: mesenchymal-endoderm transition). In stage 3, cells in the mesenchymal-endoderm transition stage are treated with nicotinamide in order to further differentiate into self-assembled,3-dimensional islet cell-like clusters that express multiple genes related to pancreatic β-cell development and function (stage 3: IPC). We also found that the transplantation of IPCs can normalize blood glucose levels and rescue glucose homeostasis in streptozotocin-induced diabetic mice. These results indicate that hLMDFs have the capacity to differentiate into functionally competent IPCs and represent a potential cell-based treatment for diabetes mellitus.