• Reproductive and Developmental Biology
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• v.32 no.1
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• pp.9-14
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• 2008

Efficient gene transfer into hematopoietic stem cells is a great tool for gene therapy of hematopoietic disease. Retrovirus have been extensively used for gene delivery and gene therapy. However, current in vitro gene transfer has some obstacles suck as induction of differentiation loss of self-renewal capacity, and down-regulation of homing efficiency for in vitro hematopoietic stem cells transplantation. To overcome these problems, we developed efficient in vitro retroviral transfer technique by direct intra-bone marrow injection (IBM). We identified effective retrovirus gene transfer in bone marrow hematopoietic cells in vitro. Two weeks after retrovirus transfer via IBM injection, we observed stable EGFP gene expression in bone marrow, lymph node, spleen, and liver cells. In addition, $6.4{\pm}2.7%$ of hematopoietic stem/progenitor cells were expressed EGFP transgene from flow cytometry analysis. Our results demonstrate that in vitro retrovirus gene transfer via IBM injection can provide a viable alternative to current or moo gene transfer approach.

• Korean Journal of Clinical Laboratory Science
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• v.50 no.4
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• pp.391-398
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• 2018

Mesenchymal stem cells (MSCs) are an attractive resource for refractory patients because of their anti-inflammatory/immunomodulatory capability and multi-lineage differentiation potential. The transplantation of MSCs has led to positive results in preclinical and clinical application to various diseases, including autoimmune disease, cardiovascular disease, cancer, liver cirrhosis, and ischemic stroke. On the other hand, studies have shown that paracrine factors, not direct cell replacement for damaged cells or tissue, are the main contributors in MSC-based therapy. More recently, evidence has indicated that MSC-derived exosomes play crucial roles in regulating the paracrine factors that can mediate tissue regeneration via transferring nucleic acids, proteins, and lipids to the local microenvironment and cell-to-cell communication. The use of these exosomes is likely to be beneficial for the therapeutic application of MSCs because their use can avoid harmful effects, such as tumor formation involved in cell transplantation. Therefore, therapeutic applications using MSC-derived exosomes might be safe and efficient strategies for regenerative medicine and tissue engineering. This review summarizes the recent advances and provides a comprehensive understanding of the role of MSC-derived exosomes as a therapeutic agent.

• Journal of Dental Rehabilitation and Applied Science
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• v.25 no.2
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• pp.191-200
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• 2009

Dental Pulp Stem Cells are superior to other types of adult stem cell. Because of teeth are easy to access and are extracted throughout life. A supernumerary tooth is an important clinical problem found in various populations of the world. The incidence of supernumerary teeth varies depending on the literature source. Pediatric dentists are routinely extracted them. However, no studies have been reported regarding Dental Pulp stem cells in a supernumerary tooth, and we failed to note that a valuable source of human stem cell. Herein, we tried to show that a supernumerary tooth contains cells that display the characteristic features of stem cells.

• The Science & Technology
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• s.507
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• pp.32-35
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• 2011

• Reproductive and Developmental Biology
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• v.32 no.3
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• pp.193-198
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• 2008

The current study was designed to extend the technique of spermatogonial transplantation to economically important pig model We evaluated the efficiency of pig to pig transplantation. Donor testis cells were harvested from testes obtained at castration of 10- to 14-day-old boars and were labeled with fluorescent marker(PKH26) before transplantation. The presence of infused dye or labeled pig testicular cells was confirmed in the seminiferous tubules from recipient pig. The most effective procedure of intratubular germ cell transfer was to insert an fine needle ($21{\sim}25$ gauge) through the cauda epididymis and testis into the rete testis under ultrasound guidance. Infusion of $5{\sim}7ml$ of dye solution or cell suspension could fill the rete and up to 50% of seminiferous tubules of 14-week-old boars. Testis were examined for the presence and localization of labeled donor cells immediately after transplantation and labeled donor cells were found in numerous seminiferous tubules from recipient pig testes. These results indicate that germ cell transplantation is feasible in recipient pig testis. This study represents successful spermatogonial transplantation between individual animals in a livestock species.

• Journal of Life Science
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• v.17 no.8 s.88
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• pp.1039-1045
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• 2007

Glioblastoma multiforme (GBM) is the most frequently occurring brain cancer. Although the existence of cancer stem cells (CSCs) in GBM has been established, there is little evidence to explain the link between CSCs and chemoresistance. In this study, we investigated that only a few cells of A172 and established GBM2 survived after 1,3-bis(2chloroethyl)-1-nitrosourea (BiCNU) exposures and these sur-vived cells resist the subsequent BiCNU treatment. In addition, these BiCNU-resistant small pop-ulations derived from GBM cells increased the phosphorylations of Erk and Akt and highly expressed CD133 stem cell surface marker. Furthermore, we observed that the BiCNU-resistant cancer cells de-rived from GBM have grown tumors when transplanted into severe combined immuno-deficient (SCID) mouse brain. These results demonstrate that BiCNU-resistant subpopulation cells derived from GBM have cancer stem-like cell properties. Therefore, it may provide provide further evidence that CSCs in GBM have chemotherapeutic drug resistance.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2003.11a
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• pp.71-72
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• 2003

최근 생쥐에서 정원세포를 이용한 생식선 카이메라의 생산이 보고되었다. 정원세포의 경우 성축으로부터 세포를 다량으로 얻기가 쉬우며, 수용체 정소 내로 이식될 경우 생식선 카이메라의 생산능력이 있어서 이전의 배아줄기 세포를 이용할 때의 문제점을 효율적으로 해결할 수 있다. 또한 유전자가 도입된 정원세포의 이식에 의한 수용체 정소 내에서의 정자형성의 보고는 정원세포를 이용한 형질전환 동물의 생산 시스템으로의 개발 가능성을 보여준다. 본 실험에서는 닭에서 기존에 이용되어 왔던 형질전환 동물 생산 시스템의 문제점을 극복하고자 주령별 정원세포의 분리 및 이식을 통하여 조류에서 정원세포의 이식방법을 확립하고 생식선 카이메라 생산효율을 증진시키기 위하여 불임제인 부설판 등을 이용한 불임화 기술을 확립하여, 결국 조류에서의 형질전환 조류 생산 시스템으로서의 개발가능성을 제시하고자 한다.

• Journal of Oral Medicine and Pain
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• v.37 no.3
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• pp.147-154
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• 2012

Hematopoietic stem-cell transplantation (HSCT) is a treatment for immune deficiency, autoimmune diseases, and hematopoietic malignancies. The main complication of allogenic HSCT is graft-versus-host disease (GVHD). Oral mucosal biopsy is needed for a definitive diagnosis and treatment planning of GVHD, but this procedure causes bleeding and bacteremia in a poor general condition. We evaluated the efficacy of laser-assisted biopsy as a minimally invasive treatment. Three cases were described in this article. All patients' medical records, clinical photographs, and histopathologic findings were reviewed. All patients felt comfortable and no severe complications occurred. The quality of the obtained biopsy material was adequate for a definitive diagnosis of GVHD. Laser-assisted, minimally invasive biopsy of the oral mucosa does not cause bleeding, and it reduces the chances of infection, bacteremia, and postoperative scarring compared to the usual histopathologic biopsy procedure. It would thus be advantageous to use this procedure to biopsy GVHD patients.

• Reproductive and Developmental Biology
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• v.32 no.1
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• pp.1-7
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• 2008

The SCID-repopulation cells(SRCs) assay has been widely used to determine the self-renewal capacity of hematopoietic stem cells (HSCs). In this study, we tested the repopulating efficiency of porcine bone marrow derived hematopoietic stem cells using nonobese diabetic/severe combined immunodieficient (NOD/SCID) mice which was inherited immunodeficiency mire with defect of T cells, B cells, and low activity of NK cells. We transplanted porcine bone marrow hematopoietic stem/progenitor cells with intraperitoneal injection into neonate NOD/SCID mice. We confirmed efficient reconstitution activity of inoculated porcine hematopoietis cells in variety of organs of NOD/SCID mice. Interestingly, pig $CD3^+$ T lymphocytes detected with high level in liver($15.6{\pm}3.7%$), spleen($5.6{\pm}3.0%$), thymus($1.5{\pm}1.3%$), and BM($2.3{\pm}0.9%$), respectively. These data imply that microenvironment of neonate NOD/SCID mice is very efficient for proliferation and differentiation of porcine T cells, and can be useful for the study of T cells development and renogeneic organ transplantation.

• Journal of Life Science
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• v.17 no.5 s.85
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• pp.678-686
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• 2007

Human mesenchymal stem cells(hMSC), that have been reported to be present in bone marrow, adipose tissues, dermis, muscles and peripheral blood, have the potential to differentiate along different lineages including those forming bone, cartilage, fat, muscle and neuron. Therefore, hMSC are attractive candidates for cell and gene therapy. The optimal conditions for hMSC expansion require medium supplemented with fetal bovine serum(FBS). Some forms of cell therapy will involve multiple doses, raising a concern over immunological reactions caused by medium-derived FBS proteins. Previously, we have shown that hADSC can be cultured in human serum(HS) during their isolation and expansion, and that they maintain their proliferative capacity and ability for multilineage differentiation and promote engraftment of peripheral blood-derived CD34 cells mobilized from bone marrow in NOD/SCID mice. In this study we determined whether hADSC grown in HS maintain surface markers expression similar with cells grown in FBS during culture expansion and compared gene expression profile by Affymetrix microarray. Flow cytometry analysis showed that HLA-DR, CD117, CD29 and CD44 expression in HS-cultured hADSC during culture expansion were similar with that in FBS-cultured cells. However, the gene expression profile in HS-cultured hADSC was significantly different from that in FBS-cultured cells. Therefore, these data indicated that HS-cultured hADSC should be used in vivo animal study of hADSC transplantation for direct extrapolation of preclinical data into clinical application.