Chabiotech Co.

Seoul, South Korea

Chabiotech Co.

Seoul, South Korea
SEARCH FILTERS
Time filter
Source Type

Patent
Chabiotech Co. and Biometrix Technology Inc. | Date: 2010-12-08

The present invention relates to a DNA chip for detecting or typing human papilloma virus (HPV), which comprises (a) a solid substrate of which the surface is coated with a calixarene derivative and (b) a probe hybridizable with the HPV nudeotide sequence which is fixed on the solid substrate. The prove comprises (i) a hybridization site for hybridizing the probe with the HPV nucleotide sequence and (ii) a fixation site containing at least two guanines. Since the DNA chip for HPV genotyping is configured in a strip, the application of the sample to be analyzed and analysis of the results are easy. In addition, the disclosed DNA chip can perform a quantitative analysis of HPV in the sample besides the HPV genotyping.


PubMed | Korea University, National Institute of Animal Science, CHA Biotech. Co., Chonbuk National University and 3 more.
Type: Journal Article | Journal: Immune network | Year: 2015

The triggering receptor expressed on myeloid cells (TREM) family, which is abundantly expressed in myeloid lineage cells, plays a pivotal role in innate and adaptive immune response. In this study, we aimed to identify a novel receptor expressed on hematopoietic stem cells (HSCs) by using in silico bioinformatics and to characterize the identified receptor. We thus found the TREM-like transcript (TLT)-6, a new member of TREM family. TLT-6 has a single immunoglobulin domain in the extracellular region and a long cytoplasmic region containing 2 immunoreceptor tyrosine-based inhibitory motif-like domains. TLT-6 transcript was expressed in HSCs, monocytes and macrophages. TLT-6 protein was up-regulated on the surface of bone marrow-derived and peritoneal macrophages by lipopolysaccharide stimulation. TLT-6 exerted anti-proliferative effects in macrophages. Our results demonstrate that TLT-6 may regulate the activation and proliferation of macrophages.


Shin K.S.,CHA Medical University | Lee H.J.,Chabiotech Co. | Jung J.,CHA Medical University | Cha D.H.,CHA Medical University | Kim G.J.,CHA Medical University
Cell Proliferation | Year: 2010

Objectives: Translational research using adult stem cells derived from various tissues has been highlighted in cell-based therapy. However, there are many limitations to using conventional culture systems of adult stem cells for clinically applicability, including limited combinations of cytokines and use of nutrients derived from animals. Here, we have investigated the effects of placental extract (PE) for culture of placenta-derived stem cells (PDSCs) as well as their potential for hepatogenic differentiation. Materials and methods: Placental extract, extracted using water-soluble methods, was used as a supplement for culture of PDSCs. Cell viability was determined using the MTT assay, and cytokine assay was performed using Luminex assay kit. Gene expression, indocyanine green (ICG) up-take, PAS (Periodic Acid-Schiff) staining and urea production were also analysed. Results: The placental extract contained several types of cytokine and chemokine essential for maintenance and differentiation of stem cells. Expression of stemness markers in PDSCs cultured with PE is no different from that of PDSCs cultured with foetal bovine serum (FBS). After hepatogenic differentiation, expression patterns for hepatocyte-specific markers in PDSCs cultured with PE were consistent and potential for hepatogenic differentiation of PDSCs cultured with PE was similar to that of PDSCs cultured with FBS, as shown by PAS staining and urea production assays. Conclusions: Our findings revealed that placental extract could be used as a new component for culture of adult stem cells, as well as for development of human-based medium, in translational research for regenerative medicine. © 2010 Blackwell Publishing Ltd.


Park J.S.,CHA Medical University | Woo D.G.,Chabiotech Co. | Yang H.N.,Chabiotech Co. | Lim H.J.,Catholic University of Korea | And 3 more authors.
Journal of Biomedical Materials Research - Part A | Year: 2010

In this study, in vivo studies, both nude mouse and rabbit cartilage defect, were tested for chondrogenesis using stem cells (SCs) using growth factor. Specifically, human mesenchymal stem cells (hMSCs) were embedded in a hydrogel scaffold, which was coencapsulated with transforming growth factor-β3 (TGF-β3). The specific extracellular matrices (ECMs) released from hMSCs transplanted into the animal were assessed via glycosaminoglycan (GAG)/DNA content, RT-PCR, real time-QPCR, immunohistochemical (IHC), and Safranin-O staining and were observed up to 7 weeks after injection. By detection of ECMs the GAG content per cell remained constant for all formulations, indicating that the dramatic increase in cell number for samples with TGF-β3 was accompanied by the maintenance of the cell phenotypes. The histological and IHC staining of the newly repaired tissues observed after treatment with TGF-β3 mixed with hMSCs evidenced hyaline cartilage-like characteristics. Moreover, the results observed with the animal model (rabbit) treated with hMSCs embedded in the growth factor-containing hydrogel indicate that the implantation of mixed cells with TGF-β3 may constitute a clinically efficient method for the regeneration of hyaline articular cartilage. © 2009 Wiley Periodicals, Inc.


Song W.K.,CHA Medical University | Park K.-M.,CHA Biotech Co. | Kim H.-J.,CHA Biotech Co. | Lee J.H.,CHA Biotech Co. | And 5 more authors.
Stem Cell Reports | Year: 2015

Embryonic stem cells hold great promise for various diseases because of their unlimited capacity for self-renewal and ability to differentiate into any cell type in the body. However, despite over 3 decades of research, there have been no reports on the safety and potential efficacy of pluripotent stem cell progeny in Asian patients with any disease. Here, we report the safety and tolerability of subretinal transplantation of human embryonic-stem-cell (hESC)-derived retinal pigment epithelium in four Asian patients: two with dry age-related macular degeneration and two with Stargardt macular dystrophy. They were followed for 1 year. There was no evidence of adverse proliferation, tumorigenicity, ectopic tissue formation, or other serious safety issues related to the transplanted cells. Visual acuity improved 9-19 letters in three patients and remained stable (+1 letter) in one patient. The results confirmed that hESC-derived cells could serve as a potentially safe new source for regenerative medicine. © 2015 The Authors.


Jeon S.Y.,CHA Medical University | Lee H.-J.,Chabiotech. Co. | Park J.M.,CHA Medical University | Jung H.M.,Korea University | And 5 more authors.
Journal of Cellular Biochemistry | Year: 2010

In regulation of the developmental process, the balance between cellular proliferation and cell death is critical. Placental development tightly controls this mechanism, and increased apoptosis of placental trophoblasts can cause a variety of gynecological diseases. Members of the immortalization-upregulated protein (IMUP) family are nuclear proteins implicated in SV40-mediated immortalization and cellular proliferation; however, the mechanisms by which their expression is regulated in placental development are still unknown. We compared IMUP-2 expression in normal and pre-eclamptic placental tissues and evaluated the function of IMUP-2 in HTR-8/SVneo trophoblast cells under hypoxic conditions. IMUP-2 was expressed in syncytiotrophoblasts and syncytial knots of the placental villi. IMUP-2 expression was significantly higher in preterm pre-eclampsia patients than in patients who went to term (P<0.001); however, we observed no differences in IMUP-2 expression between normal term patients with and without pre-eclampsia. Hypoxic conditions increased apoptosis of HTR8/SVneo trophoblast cells and induced IMUP-2 expression. Also, apoptosis of HTR-8/SVneo trophoblast cells was increased after IMUP-2 gene transfection. These results suggest that IMUP-2 expression is specifically elevated in preterm pre-eclampsia and under hypoxic conditions, and that IMUP-2 induces apoptosis of the trophoblast. Therefore, IMUP-2 might have functional involvement in placental development and gynecological diseases such as pre-eclampsia. © 2010 Wiley-Liss, Inc.


Park J.S.,Dong - A University | Yang H.N.,Dong - A University | Jeon S.Y.,Dong - A University | Woo D.G.,Chabiotech Co. | And 2 more authors.
Biomaterials | Year: 2012

In drug delivery systems, some genes have the potential to interrupt unnecessary gene expression in specific target cells. In this study, two types of drug, glucocorticoids and siRNA, were co-delivered into conditioned cells to inhibit the expression of unnecessary genes and proteins involved in arthritis. To deliver the two factors into a human chondrocyte cell line (C28/I2), dexamethasone was first loaded into PLGA nanoparticles, and then drug-loaded PLGA nanoparticles were complexed with poly(ethyleneimine) (PEI)/siRNA. To test the co-delivery of siRNA and dexamethasone into chondrocytes, cells were transfected with green fluorescence protein siRNA (GFP siRNA) and drugs. After transfection with GFP siRNA, 70% reduction of C28/I2 cells demonstrated GFP expression, whereas MOCK carrying PLGA nanoparticles and PLGA nanoparticles without siRNA showed no differences of GFP expressions. COX-2 and iNOS productions in C28/I2 cells were examined after TNF-α pre-treatment to induce expression of arthritis-related molecules in vitro. The reduction of gene and protein expression associated with arthritis by transfection with dexamethasone-loaded and COX-2 siRNA-complexed PLGA nanoparticles was evaluated by RT-PCR, real time-qPCR, immunoblotting, immunohistochemistry, and immunofluorescence imaging. © 2012 Elsevier Ltd.


Park J.S.,Dong - A University | Yang H.N.,Dong - A University | Woo D.G.,Chabiotech Co. | Jeon S.Y.,Dong - A University | And 5 more authors.
Biomaterials | Year: 2012

In this study, synergistic effects of electrical stimulation and exogenous Nurr1 gene expression were examined to induce the differentiation of human mesenchymal stem cells (hMSCs) into nerve cells in in vitro culture system. A two-step procedure was designed to evaluate the effects of electrical stimulus and exogenous gene delivery for inducing neurogenesis. First, an electrical stimulation device was designed using gold nanoparticles adsorbed to the surface of a cover glass. Gold nanoparticles, as an electrical conductor for stem cells, are well-defined particles adsorbed to a polyethyleneimine (PEI)-coated cover glass. The nanoparticle morphology was examined by scanning electron microscope (SEM). Second, a plasmid carrying Nurr1 cDNA was complexed with biodegradable poly-(dl)-lactic-co-glycolic acid (PLGA) nanoparticles to support neurogenesis. To evaluate the neuronal differentiation of stem cells mediated by the treatment with either electrical stimulation and exogenous Nurr1 gene delivery, or both, the expression of neuron-specific genes and proteins was examined by RT-PCR and Western blotting. Cells transfected with exogenous Nurr1 genes plus electrical stimulation (250 mV for 1000 s) showed the greatest level of neurite outgrowth with a mean neurite length of 150 μm. Neurite length in cells treated with only one stimulus was not significant, approximately 10-20 μm. These results indicate that electrical stimulation and exogenous Nurr1 gene expression together may be adequate to induce nerve regeneration using stem cells. © 2012 Elsevier Ltd.


Park J.S.,Dong - A University | Yang H.N.,Dong - A University | Woo D.G.,Chabiotech Co. | Jeon S.Y.,Dong - A University | Park K.-H.,Dong - A University
Biomaterials | Year: 2013

Wounded tissues and cells may be treated with growth factors and specific genes for the purpose of tissue repair and regeneration. To deliver specific genes into tissues and cells, this study presents the use of fabricated poly (dl-lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) complexed with the cationic polymer poly (ethleneimine) (PEI). Through complexation with PEI, several types of genes (SOX9, Cbfa1, and C/EBP-α) were coated into PLGA NPs, which enhanced gene uptake into normal human-derived dermal fibroblast cells (NFDHCs) in vitro and in vivo. Several cell types (293T, HeLa, and fibroblast cells) were transfected with fluorescence-tagged PEI/SOX9, PEI/Cbfa1, and PEI/C/EBP-α gene-complexed PLGA NPs. The gene and protein expression levels in the cells were evaluated by RT-PCR, real-time quantitative PCR, Western blotting, and confocal laser microscopy. Fibroblast cells encapsulated in fibrin gels were transfected with the gene-complexed NPs plus specific growth factors (TGF-β3, BMP-2, or IGF/bFGF), which induced chondrogenesis, osteogenesis, or adipogenesis both in vitro and after transplantation into nude mouse. © 2012 Elsevier Ltd.


Jeon S.Y.,Dong - A University | Park J.S.,Dong - A University | Yang H.N.,Dong - A University | Woo D.G.,Chabiotech Co | Park K.-H.,Dong - A University
Stem Cells and Development | Year: 2014

During embryogenesis, specific proteins expressed in cells have key roles in the formation of differentiated cells and tissues. Delivery of specific proteins into specific cells, both in vitro and in vivo, has proved to be exceedingly difficult. In this study, we developed a safe and efficient protein delivery system using encapsulation of proteins into biodegradable poly-(lactic-co-glycolic acid) (PLGA) nanoparticles (NPs). The PLGA NPs were used to deliver proteins into human mesenchymal stem cells (hMSCs). Fluorescent markers loaded into the PLGA NPs were used to verify the internalization of NPs into hMSCs using FACS analysis and confocal microscopy. With these methods, we demonstrated that the encapsulated model proteins are readily delivered into hMSCs, released from the NP vehicles, and, finally, moved into the cytosols. Using chondrogenesis-related proteins such as aggrecan and cartilage oligomeric matrix protein (COMP), chondrogenic differentiation of hMSCs treated with aggrecan and COMP encapsulated PLGA NPs was clearly observed and caused to differentiate into chondrocytes. © Mary Ann Liebert, Inc.

Loading Chabiotech Co. collaborators
Loading Chabiotech Co. collaborators