Abstract:
본 발명은 친수성 아미노산과 소수성 아미노산이 순차적으로 결합된 자가조립 펩타이드와 물질 P(Substance P)가 결합된 줄기세포 동원(recruiting) 활성을 가지는 폴리펩타이드에 관한 것으로, 소재 자체에 면역반응이 없고, 생체 복원 후 무해하게 분해되는 소재로서 물질 P로 인하여 줄기세포 동원 활성을 나타냄으로써, 비침습적인 방법으로 원하는 생체 조직이나 부위에 줄기세포가 생체이동하여 줄기세포에 의한 치료효과를 달성할 수 있도록 한다. 본 발명의 줄기세포 동원(recruiting) 활성을 가지는 폴리펩타이드는 특히 신생혈관 형성 및 조직 재생에 효과적으로 작용하므로 혈관 폐색으로 나타나는 질환, 특히 하지허혈증, 심근경색, 근경색, 뇌혈관질화, 말초혈관성 질환등의 허혈성 질환 치료제로 활용될 수 있다.
Abstract:
PURPOSE: A polypeptide which induces differentiation of stem cells into cartilage is provided to create an environment which is suitable for differentiating stem cells into cartilage by collagen mimetic peptides, thereby enhancing differentiation and regenerating cartilage tissues. CONSTITUTION: A polypeptide which induces differentiation of stem cells into cartilage contains a self-assembled peptide with an amino acid sequence of general formula 1 ((alpha beta)_n) and collagen mimetic peptides. The collagen mimetic peptides have an amino acid sequence of general formula 2 ((-glycine-proline-hydroxyproline-)_m). The collagen mimetic peptide is (-glycine-proline-hydroxyproline-)_7.
Abstract:
PURPOSE: A method for manufacturing a porous biodegradable polymer supporter by using a supercritical fluid-organic solvent system is provided to be used to manufacture a porous supporter at a body temperature or below, thereby facilitating the introduction of bioactive substances and the connection between pore spaces. CONSTITUTION: A method for manufacturing a porous biodegradable polymer supporter comprises the following steps: putting a biodegradable polymer and an organic solvent into a mold, putting the biodegradable polymer and the organic solvent into a high pressure reactor, and then heating the reactor at a room temperature of 75°C; injecting carbon dioxide so that the temperature inside the reactor is 70-700 bar and maintaining the inside pressure so that the injected carbon dioxide permeates inside the polymer in the state of a supercritical fluid; and lowering the inside pressure to an atmospheric pressure by discharging the carbon dioxide inside the reactor.
Abstract:
PURPOSE: A method for differentiating stem cells into smooth muscle cells and a smooth muscle cell-scaffold complex for tissue engineering are provided to effectively differentiate human adipose-derived stem cells into the smooth muscle cells. CONSTITUTION: A method for differentiating stem cells into smooth muscle cells comprises a step of applying stress to a stem cell-inoculating elastic scaffold in a medium containing biochemical differentiation factor of TFG-beta-1, platelet-derived growth factor-BB(PDGF-BB), ascorbic acid, retinoic acid, or angiotensin II. The biochemical differentiation factor is retinoic acid. The elastic scaffold is formed of biodegradable polymers. The biodegradable polymer is a copolymer of lactic acid and carprolactone. A smooth muscle cell-scaffold complex for tissue engineering contains the differentiated smooth muscle cells for vascular disease treatment or wound healing.
Abstract:
본 발명은 초임계 유체-유기용매 시스템을 이용한 생분해성 고분자 입체이성질 복합체의 제조 방법 및 그로부터 제조된 고분자 입체이성질 복합체에 관한 것으로 반응기에 서로 다른 입체구조의 단일상 고분자 두 종류와 소량의 유기용매를 넣고 초임계 유체를 주입한 후 일정 온도와 압력을 가하여 결정구조를 갖는 고분자 입체이성질 복합체를 형성하는 본 발명의 방법에 따르면, 열적, 기계적 안정성이 우수하며, 파우더 또는 다공성 구조의 폼 형태를 갖는 생분해성 고분자 입체이성질 복합체를 단일 공정으로 간단하고 경제적이면서도 친환경적으로 제조할 수 있다.
Abstract:
PURPOSE: A preparation method of a biodegradable polymer stereocomplex is provided to prepare the biodegradable polymer stereocomplex with foam shape with a powdery or porous structure, and to ensure thermal and mechanical stability. CONSTITUTION: A preparation method of a biodegradable polymer stereocomplex comprises the steps of: putting a biodegradable single phase D-type polymer and L-type polymer into a reactor; and adding an organic solvent to the reactor and injecting a supercritical fluid to react the two single phase polymers with a stereocomplex polymer. The monomer used in the polymerization of the D-type polymer and L-type polymer is a cyclic ester monomer having chiral carbon.