• 한국동물학회:학술대회논문집
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• 한국동물학회 1995년도 한국생물과학협회 학술발표대회
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• pp.260.2-260
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• 1995

No Abstract, See Full Text

• 대한방사선기술학회지:방사선기술과학
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• 제25권2호
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• pp.77-82
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• 2002

이미 분화된 연골세포의 성숙과정에 미치는 X-선의 작용에 대해서는 잘 알려져 있다. 그러나 연골세포나 섬유아세포, 근육세포로 분화될 수 있는 미분화 간충직 세포의 분화과정에 미치는 X-선의 영향에 대해서는 잘 알려져 있지 않아, 본 연구에서는 초기 분화연구에 좋은 대상이 되는 계배 미분화 간충직세포를 이용하여 선량(1-10Gy)에 따라 연골세포 분화 과정에 X-선이 어떤 영향을 미치는가를 조사하였다. 연구결과 선량 의존적으로 연골세포분화가 억제됨을 alcian blue로 sulfated proteoglycan을 염색한 결과를 통해 알 수 있었다. 이는 X-선이 간충직세포와 같은 성숙 이전의 연골성 세포들에게는 모두 영향을 미침을 보여주는 것이다. 또한 이미 알려진 바와 같이 X-선은 분화된 연골세포의 성숙과정에 영향을 주기도 하지만 상기 연구를 통해서 간충직세포로부터 연골세포로 분화하는 과정을 억제시키기도 함을 보여줌으로써 간충직세포로부터 성숙된 연골세포로 되는 전과정에 X-선이 영향을 미친다는 사실과, 분화가 이루어지지 않은 세포일수록 X-선 조사의 영향을 크게 받음을 알 수 있다.

• 한국동물학회:학술대회논문집
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• 한국동물학회 1996년도 한국생물과학협회 국제학술대회
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• pp.164.1-164
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• 1996

No Abstract, See Full Text

• 한국동물학회:학술대회논문집
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• 한국동물학회 1999년도 한국생물과학협회 학술발표대회
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• pp.181.2-181
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• 1999

No Abstract, See Full Text

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVI)
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• pp.239-243
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• 2005

본 실험에서는 골막조직 내에 존재하는 PDPCs를 분리하고, 기존 피부 이식을 위해 사용되는 $Hyalrograft^{\circledR}$ 3D에서의 chondogenesis가 가능함을 확인하였다. 수적인 확보가 제한되는 연골세포의 대체 세포로서 PDPCs의 가능성을 확인하였으며 동시에 $Hyalrograft^{\circledR}$ 3D에서의 연골화는 지지체의 양적 확보에 있어 기존의 $Hyalograft^{\circledR}$ C 보다 경제적일 수 있음을 의미한다.

• Molecules and Cells
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• 제24권1호
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• pp.9-15
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• 2007

To investigate the effects of chitosan on the redifferentiation of dedifferentiated chondrocytes, we used chondrocytes obtained from a micromass culture system. Micromass cultures of chick wing bud mesenchymal cells yielded differentiated chondrocytes, but these dedifferentiated during serial monolayer subculture. When the dedifferentiated chondrocytes were cultured on chitosan membranes they regained the phenotype of differentiated chondrocytes. Expression of protein kinase $C{\alpha}$ ($PKC{\alpha}$) increased during chondrogenesis, decreased during dedifferentiation, and increased again during redifferentiation. Treatment of the cultures with phorbol 12-myristate 13-acetate (PMA) inhibited redifferentiation and down-regulated $PKC{\alpha}$. In addition, the expression of p38 mitogen-activated protein (MAP) kinase increased during redifferentiation, and its inhibition suppressed redifferentiation. These findings establish a culture system for producing chondrocytes, point to a new role of chitosan in the redifferentiation of dedifferentiated chondrocytes, and show that $PKC{\alpha}$ and p38 MAP kinase activities are required for chondrocyte redifferentiation in this model system.

• BMB Reports
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• 제44권1호
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• pp.28-33
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• 2011

MicroRNAs are potential key regulators in mesenchymal stem cells chondrogenic differentiation. However, there were few reports about the accurate effects of miRNAs on chondrogenic differentiation. To investigate the mechanisms of miRNAs-mediated regulation during the process, we performed miRNAs microarray in MSCs at four different stages of TGF-${\beta}3$-induced chondrogenic differentiation. We observed that eight miRNAs were significantly up-regulated and five miRNAs were downregulated. Interestingly, we found two miRNAs clusters, miR-143/145 and miR-132/212, kept on down-regulation in the process. Using bioinformatics approaches, we analyzed the target genes of these differentially expressed miRNAs and found a series of them correlated with the process of chondrogenesis. Furthermore, the qPCR results showed that the up-regulated (or down-regulated) expression of miRNAs were inversely associated with the expression of predicted target genes. Our results first revealed the expression profiles of miRNAs in chondrogenic differentiation of MSCs and provided a new insight on complicated regulation mechanisms of chondrogenesis.

• 한국잠사곤충학회지
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• 제50권1호
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• pp.15-19
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• 2012

최근 다양한 생체재료를 이용하여 연골재생과 관련한 많은 연구가 진행되고 있다. 실크단백질은 생체적합성이 뛰어나며, 우수한 기계적 강도를 가지고 있는 천연 고분자 물질로서 최근 생체재료로 사용하기위한 연구가 세계적으로 많이 이루어지고 있다. 본 연구는 실크단백질이 연골재생에 효과가 있는지를 확인하기위하여 수행되었다. 우리는 연골세포를 코뼈로부터 분리하고, 3종류의 배지 (DMEM, DMEM/F12, RPMI)와 서로 다른 농도의 ascorbic acid를 사용하여 최적 배양조건을 확립하였다. 그 결과 우리가 분리한 연골세포는 10% FBS와 $100{\mu}M$ ascorbic acid가 함유된 DMEM배지에서 가장 잘 생장하였다. 연골에 대한 실크의 영향을 관찰하기위해서, 실크 피브로인 용액을 제작하고 이를 멸균한것과 멸균하지 않은 것으로 구분하여 연골세포 배양 시 첨가하여 연골분화에 대한 마커인자인 제2형 콜라겐의 발현량을 측정하였다. 멸균하지 않은 실크 피브로인 첨가시 제2형 콜라겐의 발현량이 2.7배 증가하였으나, 멸균된 실크 피브로인의 첨가는 제2형 콜라겐의 발현량을 오히려 감소시켰다. 또한 실크 피브로인은 제10형 콜라겐의 발현을 증가시키는 것을 확인하였다. 이 효과는 특히 연골세포를 3차원 배양할 때 더 컸다. 본 연구결과를 통하여 우리는 연골을 재생하는데 있어서 실크 단백질을 가능성을 보았으며, 향후 연구에서 연골재생과 실크의 관계를 좀 더 정밀하게 파악하고자 한다.

• BMB Reports
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• 제49권10호
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• pp.548-553
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• 2016

Mesenchymal stem cells (MSCs) are widely used in cartilage tissue engineering to repair articular cartilage defects. However, hypertrophy of chondrocytes derived from MSCs might hinder the stabilization of hyaline cartilage. Thus, it is very important to find a suitable way to maintain the chondrogenic phenotype of chondrocytes. It has been reported that cordycepin has anti-inflammatory and anti-tumor functions. However, the role of cordycepin in chondrocyte hypertrophy remains unclear. Therefore, the objective of this study was to determine the effect of cordycepin on chondrogenesis and chondrocyte hypertrophy in MSCs and ATDC5 cells. Cordycepin upregulated chondrogenic markers including Sox9 and collagen type II while down-regulated hypertrophic markers including Runx2 and collagen type X. Further exploration showed that cordycepin promoted chondrogenesis through inhibiting Nrf2 while activating BMP signaling. Besides, cordycepin suppressed chondrocyte hypertrophy through PI3K/Bapx1 pathway and Notch signaling. Our results indicated cordycepin had the potential to maintain chondrocyte phenotype and reconstruct engineered cartilage.

• Archives of Plastic Surgery
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• 제33권1호
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• pp.46-52
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• 2006

High-density micromass culture was needed to take three dimensions culture with ASCs(adipose derived stromal cells) and chondrogenesis. However, the synthetic polymer has hydrophobic character and low affinity to cells and other biomolecules. Therefore, the surface modification without changes of physical and chemical properties is necessary for more suitable condition to cells and biomolecules. This study was performed to investigate the effect of surface modification of poly (lactic-co-glycolic acid)(PLGA) scaffold by plasma treatment (P(+)) on the adhesion, proliferation and chondrogenesis of ASCs, and not plasma treatment (P(-)). ASCs were isolated from human subcutaneous adipose tissue obtained by lipectomy and liposuction. At 1 hour 30 minutes and 3days after cell seeding onto the P(-) group and the P(+) group, total DNA amount of attached and proliferated ASCs markedly increased in the P(+) group (p < 0.05). The changes of the actin under confocal microscope were done for evaluation of cellular affinity, at 1 hour 30 minutes, the shape of the cells was spherical form in all group. At 3rd day, the shape of the cells was fiber network form and finely arranged in P(+) group rather than in P(-) group. RT-PCR analysis of cartilage-specific type II collagen and link protein were expressed in 1, 2 weeks of induction. Amount of Glycoaminoglycan (GAG) markedly increased in P(+) group(p < 0.05). In a week, extracellular matrix was not observed in the Alcian blue and Safranin O staining. However in 2 weeks, it was observed that sulfated proteoglycan increased in P(+) group rather than in P(-) group. In conclusion, we recognized that plasma treatment of PLGA scaffold could increase the hydrophilic property of cells, and provide suitable environment for high-density micromass culture to chondrogenesis