The authors wish to acknowledge funding from the European Regional Development Fund &#8211; FNUSA-ICRC (no. CZ.1.05/ 1.1.00/ 02.0123), the American Heart Association Scientist Development Grant (AHA #06-35185N), and the National Institutes of Health (NIH #T32HL007111).

자철광 젤 1. 합성 <ol><li> 에틸 알코올 다음에 탈 이온수 다음에 진한 염산을 사용하여 모든 유리 제품을 씻으십시오. 바람직하게는 건조 오븐에서, O / N을 건조하도록 허용합니다. 주의! 염산 유해 - 흄 후드에서 개인용 보호 장비는 작업을 착용; 에틸 알코올은 유해한 - 개인 보호 장비를 착용하십시오. </li><li> 탈 가스 탈 H 2 O의 500 mL로 부드럽게 30 분 동안 N 2 가스 버블 링에 의해 Dreschel 병을 사용합니다. </li><li> 셋업 화학 물질 흄 후드 내에서 자철광 합성 장치. <ol><li> isomantle 히터 내에 500㎖의 3 구 둥근 바닥 플라스크를 놓고 클램프를 사용하여 중심 목을 고정 및 스탠드. </li><li> 환저 플라스크의 목의 측면에 하나의 고무 격막 나머지 측 경부에 고무 격막과 환류 냉각기를 설치한다. 지속적으로 환류 냉각기를 통해 차가운​​ 물을 실행합니다. </li><li> 펑크 일E 환저 플라스크의 고무 N 2 가스 라인에 연결된 바늘을 격막과 기포에 실행 가스 라인에 연결된 바늘을 환류 응축기의 고무 격막을 천공 (즉, 물을 플라스크) 가스 유출을 시각화. </li><li> 패들 어댑터를 통해 둥근 바닥 플라스크의 중심 목에 블레이드 패를 설치합니다. 스탠드에 장착 된 오버 헤드 교반기에 블레이드 패의 샤프트를 연결합니다. </li></ol></li><li> N 2 가스로 둥근 바닥 플라스크를 제거하고 낮은하지만 검출 속도로 흐르는 N 2 가스를 둡니다. </li><li> 둥근 바닥 플라스크에서 환류 응축기를 제거하고, 철 (III) 클로라이드, 철 0.6125 g (II) 클로라이드 수화물 1.000 g을 추가하고, 탈기 H 2 O 50 ㎖ 주의! 철 (III) 클로라이드 및 철 (II) 클로라이드 테트라는 유해한 - 개인 보호 장비를 착용하십시오. </li><li> 50 가열하면서 환류 냉각기를 교체하고 1,000 rpm에서 교반° C. 이러한 조건에서 교반은 10 나노 미터 직경의 마그네타이트 나노 입자를 생성합니다. </li><li> 일단 50 ℃에서 계속 교반 둥근 바닥 플라스크에 고무 격막을 통해 주입하여, 28 % 수산화 암모늄 용액 10 ㎖를 추가한다. 주의! 수산화 암모늄은 유해한 - 개인 보호 장비를 착용하십시오. 주 : 수산화 암모늄 용액 마그네타이트를 침전 사용되고 용액 검게한다. </li><li> 계속 교반하면서 암모니아 가스를 끓여 90 ℃로 둥근 바닥 플라스크 및 열에서 고무 격막 및 N 2 가스 라인을 제거합니다. 주 : 환류 응축기의 고무 격막을 천공하여 둥근 바닥 플라스크에 N (2)의 흐름을 유지하는 것이 선택적이다, 그러나, 마그 헤 마이트에 마그네타이트의 산화가이 단계에서 무시할 수있다. </li><li> 계속 교반하면서 한 번에 90 ℃에서, 둥근 바닥 플라스크에 올레산 1 ㎖를 추가한다. 올레산 노나 코팅 마그네타이트를 사용noparticles는 마그네타이트 겔을 형성한다. 주의! 올레산은 유해 - 개인 보호 장비를 착용하십시오. </li><li> 둥근 바닥 플라스크에 고무 격막 및 N 2 가스 라인을 교체하고 환류 냉각기를 제거합니다. </li><li> 2 시간 동안 500 rpm에서 열 및 교반을 끕니다. </li><li> isomantle 히터에서 둥근 바닥 플라스크를 꺼내고 마그네타이트 겔을 보유하는 형틀의 저부에 대해 유지 강력 자석을 사용하는 동안 남아있는 액체를 가만히 따르다. 주의! 손상이나 부상을 방지하기 위해 극도의주의 강한 자석을 처리합니다. </li><li> (선택 사항) / N은 ​​공기 건조 O에 자철광 젤을 허용합니다. </li></ol> 자철광 젤 2. 정제 <ol><li> 마그네타이트 겔을 용해시키기 위해 둥근 바닥 플라스크에 헥산 40 mL로 추가 주의! 헥산 유해한 - 흄 후드에서 개인용 보호 장비는 작업을 착용하십시오. </li><li> 잔류 H 2 O를 제거하는 이리저리 탈기 H 2 O 40 mL를 분별 깔때기를 사용하여마그네타이트 용액 미터. <ol><li> 천천히 분리 깔때기 내의 H 상 자철광 솔루션 2 O을 부어 부드럽게 5 분 동안 2 상 액체 소용돌이 친다. </li><li> 밖으로 배출 및 하부 수성 부분을 폐기합니다. </li><li> 천천히 마그네타이트 용액 아래가 침전되도록 분별 깔때기로 탈기 H 2 O 40를 가하여 천천히 소용돌이 이전 드레인. </li><li> 세 번째 씻어 반복합니다. </li></ol></li><li> , 삼각 플라스크에 마그네타이트 용액을 전송 무수 황산나트륨 상당 몇 주걱을 추가 소용돌이 마그네타이트 용액에 남아있는 잔류 H 2 O를 제거 하였다. </li><li> 황산나트륨 및 잔류 H 2 O를 제거하는 필터 깔때기 1 ㎛ 여과지 마그네타이트 용액 필터 참고 : 진공 지원이 좋습니다. </li><li> 50 ㎖ 플라스크에 증발 마그네타이트 용액을 옮기고 용 헥산을 증발시켜, 회전 증발기를 사용하여다음의 조건으로 2 시간 : 중간 회전 속도, 진공을 50 ℃의 수욕을 증발 플라스크에, 도포하고, 24 ° C의 물을 순환하는 콘덴서. 참고 : 선택적으로, PLGA으로 코팅하기 전에 자철광 젤을 저장합니다. </li></ol> PLGA 셸 자철광 나노 입자의 코팅 (3) <ol><li> 1.5 % (m / v)의 용액을 만들고, 에틸 아세테이트 240 ㎖ 중의 3.60 g의 PLGA (75/25 블렌드)를 녹인다. 주의 : 에틸 아세테이트는 유해한 - 흄 후드에서 개인용 보호 장비는 작업을 착용하십시오. </li><li> 5.0 % (m / v)의 용액을 만들기 위해 자석 교반기를 사용하여 탈기 H 2 O 500ml에 플루로 닉 F-127 25.00 g을 용해. 주 : 플루로 닉 F-127은 생체 적합성 계면 활성제로 작용 비이 온성 양친 성 블록 공중 합체이다. 이 단계 3.3.2 중유 에멀젼을 안정화하는데 도움. </li><li> microspatula를 사용하여 가중 유리 병 안에 여섯 0.040 g 씩에 자철광 젤를 수집합니다. 반환 한각 나누어지는에 대한 다음과 같은 코팅 및 세척 과정을 ORM. 참고 : 분취 액을 4 단계에서 분해 이전하는 동결 건조를 최소화하면서 순도와 수율을 극대화 효율적 처리 및 자기 경사를 보장하기 위해 필요하다. <ol><li> 10 분 동안 초음파 세척기에서 0.040 g의 마그네타이트 겔의 분취 량과 플라스틱 비이커 및 초음파 처리에 PLGA 용액 40 ml를 추가하기. </li><li> 플라스틱 비이커에 플루로 닉 용액 80 ml에 첨가하고 약 7 분은 수 중유 에멀젼으로서 마그네타이트 PLGA 나노 입자에 코팅을 형성하기 위해 즉시 높은 설정으로 실험실 혼합기 유화. </li><li> 즉시 에틸 아세테이트를 증발시켜 화학 퓸 후드에서 1 시간 동안 탈 H 2 O 및 초음파 처리의 1 L에 SPION 용액을 희석. </li><li> SPION 솔루션 옆에 강력한 자석을 놓고 부드럽게 자석에 갈색 SPIONs를 수집 저어. 참고 :이 간헐적으로 몇 시간 동안 교반 할 필요가있다솔루션 전에 s는 SPIONs의 대부분은 수집 된 것을 나타내는 하얗게 변합니다. </li><li> 자석 비이커 SPIONs을 유지하면서 수용액 따르다. </li><li> 다음과 같이 SPIONs 세 번 씻으십시오. <ol><li> 탈 H 2 O 1 L에 SPIONs 일시 중단 </li><li> 20 분의 SPION 솔루션을 sonicate하세요. </li><li> SPION 솔루션 옆에 강력한 자석을 놓고 부드럽게 자석에 갈색 SPIONs를 수집 저어. 이 용액 SPIONs 대부분 수집 된 것을 나타내는 명확한 꺼질 때까지 몇 시간 동안 간헐적으로 교반 할 필요가있다. </li><li> 자석 비이커 SPIONs을 유지하면서 수용액 따르다. </li></ol></li></ol></li><li> 수성 현탁액과 같은 단일 가중 된 유리 바이알에 여섯 마그네타이트 겔 분취 각각으로부터 합성 SPIONs 수집. 필요에 따라 선택적으로 자기 여분의 물을 가만히 따르다. </li></ol> 4. 동결SPIONs의 -drying <ol><li> SPION 솔루션을 동결. </li><li> 동결 건조 동결 건조기에서 SPION 솔루션 O / N을. </li><li> 동결 건조 SPIONs 무게. 셀 라벨에 사용 전까지 동결 건조 SPIONs은 -20 ℃에서 저장 될 수있다. 참고 : -20 ° C 극적에 저장이 분해 반응 속도를 줄이고 수명을 증가시킨다. </li></ol> SPIONs와 세포의 5 라벨링 <ol><li> 40 mg / ml의 농도로 포스페이트 완충 식염수 (PBS)에 SPIONs의 분취 량을 중단하고 30 분 동안 초음파 처리. </li><li> 세포 배양 배지의 5 μL / ㎖의 농도에서 세포의 거의 합류 플라스크 SPION 용액을 추가한다. 조심스럽게 플라스크를 흔들어 균일 한 분포를 확인합니다. </li><li> 37 ° C에서 16 시간 동안 세포를 배양한다. </li><li> 부드럽게 문화 매체를 대기음하고 PBS로 두 번 세포를 씻으십시오. </li><li> 자기 표지 세포를 수집하고 실험을 위해 사용합니다. </li><li> 미사용 SPION 용액을 4 ℃에서 저장 될 수 있고, 우리되어야몇 개월 이내에 에드. 각 사용하기 전에 30 분 동안 초음파 처리. </li></ol>

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L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Coupled+cellular+therapy+and+magnetic+targeting+for+airway+regeneration.">Coupled cellular therapy and magnetic targeting for airway regeneration.</a> Biochem Soc Trans. 42 (3), 657-661 (2014).</li><li>El Haj, A. J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+in+vitro+model+of+mesenchymal+stem+cell+targeting+using+magnetic+particle+labelling.">An in vitro model of mesenchymal stem cell targeting using magnetic particle labelling.</a> J Tissue Eng Regen Med. , (2012).</li><li>Vanecek, V., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Highly+efficient+magnetic+targeting+of+mesenchymal+stem+cells+in+spinal+cord+injury.">Highly efficient magnetic targeting of mesenchymal stem cells in spinal cord injury.</a> Int J Nanomedicine. 7, 3719-3730 (2012).</li><li>Sasaki, H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Therapeutic+effects+with+magnetic+targeting+of+bone+marrow+stromal+cells+in+a+rat+spinal+cord+injury+model.">Therapeutic effects with magnetic targeting of bone marrow stromal cells in a rat spinal cord injury model.</a> Spine (Phila Pa 1976). 36 (12), 933-938 (2011).</li><li>Oshima, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Enhancement+of+bone+formation+in+an+experimental+bony+defect+using+ferumoxide-labelled+mesenchymal+stromal+cells+and+a+magnetic+targeting+system.">Enhancement of bone formation in an experimental bony defect using ferumoxide-labelled mesenchymal stromal cells and a magnetic targeting system.</a> J Bone Joint Surg Br. 92 (11), 1606-1613 (2010).</li><li>Luciani, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Magnetic+targeting+of+iron-oxide-labeled+fluorescent+hepatoma+cells+to+the+liver.">Magnetic targeting of iron-oxide-labeled fluorescent hepatoma cells to the liver.</a> Eur Radiol. 19 (5), 1087-1096 (2009).</li><li>Oshima, S., Kamei, N., Nakasa, T., Yasunaga, Y., Ochi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Enhancement+of+muscle+repair+using+human+mesenchymal+stem+cells+with+a+magnetic+targeting+system+in+a+subchronic+muscle+injury+model.">Enhancement of muscle repair using human mesenchymal stem cells with a magnetic targeting system in a subchronic muscle injury model.</a> J Orthop Sci. 19 (3), 478-488 (2014).</li><li>Ohkawa, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Magnetic+targeting+of+human+peripheral+blood+CD133++cells+for+skeletal+muscle+regeneration.">Magnetic targeting of human peripheral blood CD133+ cells for skeletal muscle regeneration.</a> Tissue Eng Part C Methods. 19 (8), 631-641 (2013).</li><li>Tefft, B. J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Magnetizable+Duplex+Steel+Stents+Enable+Endothelial+Cell+Capture.">Magnetizable Duplex Steel Stents Enable Endothelial Cell Capture.</a> Ieee T Magn. 49 (1), 463-466 (2013).</li><li>Uthamaraj, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Design+and+validation+of+a+novel+ferromagnetic+bare+metal+stent+capable+of+capturing+and+retaining+endothelial+cells.">Design and validation of a novel ferromagnetic bare metal stent capable of capturing and retaining endothelial cells.</a> ABME. 42 (12), 2416-2424 (2014).</li><li>Polyak, B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High+field+gradient+targeting+of+magnetic+nanoparticle-loaded+endothelial+cells+to+the+surfaces+of+steel+stents.">High field gradient targeting of magnetic nanoparticle-loaded endothelial cells to the surfaces of steel stents.</a> Proc Natl Acad Sci U.S.A. 105 (2), 698-703 (2008).</li><li>Pislaru, S. V., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Magnetically+targeted+endothelial+cell+localization+in+stented+vessels.">Magnetically targeted endothelial cell localization in stented vessels.</a> J Am Coll Cardiol. 48 (9), 1839-1845 (2006).</li><li>Pislaru, S. V., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Magnetic+forces+enable+rapid+endothelialization+of+synthetic+vascular+grafts.">Magnetic forces enable rapid endothelialization of synthetic vascular grafts.</a> Circulation. 114 (1 Suppl), 314-318 (2006).</li><li>Wang, Y. X., Xuan, S., Port, M., Idee, J. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Recent+advances+in+superparamagnetic+iron+oxide+nanoparticles+for+cellular+imaging+and+targeted+therapy+research.">Recent advances in superparamagnetic iron oxide nanoparticles for cellular imaging and targeted therapy research.</a> Curr Pharm Des. 19 (37), 6575-6593 (2013).</li><li>Yellen, B. B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Targeted+drug+delivery+to+magnetic+implants+for+therapeutic+applications.">Targeted drug delivery to magnetic implants for therapeutic applications.</a> J Magn Magn Mater. 293 (1), 647-654 (2005).</li><li>Granot, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Clinically+viable+magnetic+poly(lactide-co-glycolide)+particles+for+MRI-based+cell+tracking.">Clinically viable magnetic poly(lactide-co-glycolide) particles for MRI-based cell tracking.</a> Magn Reson Med. , (2013).</li><li>Levy, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Long+term+in+vivo+biotransformation+of+iron+oxide+nanoparticles.">Long term in vivo biotransformation of iron oxide nanoparticles.</a> Biomaterials. 32 (16), 3988-3999 (2011).</li><li>Mirshafiee, V., Mahmoudi, M., Lou, K., Cheng, J., Kraft, M. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Protein+corona+significantly+reduces+active+targeting+yield.">Protein corona significantly reduces active targeting yield.</a> Chem Commun (Camb). 49 (25), 2557-2559 (2013).</li><li>Salvati, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Transferrin-functionalized+nanoparticles+lose+their+targeting+capabilities+when+a+biomolecule+corona+adsorbs+on+the+surface.">Transferrin-functionalized nanoparticles lose their targeting capabilities when a biomolecule corona adsorbs on the surface.</a> Nat Nanotechnol. 8 (2), 137-143 (2013).</li><li>Landazuri, N., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Magnetic+targeting+of+human+mesenchymal+stem+cells+with+internalized+superparamagnetic+iron+oxide+nanoparticles.">Magnetic targeting of human mesenchymal stem cells with internalized superparamagnetic iron oxide nanoparticles.</a> Small. 9 (23), 4017-4026 (2013).</li><li>Sun, J. H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+vitro+labeling+of+endothelial+progenitor+cells+isolated+from+peripheral+blood+with+superparamagnetic+iron+oxide+nanoparticles.">In vitro labeling of endothelial progenitor cells isolated from peripheral blood with superparamagnetic iron oxide nanoparticles.</a> Mol Med Rep. 6 (2), 282-286 (2012).</li><li>Zhang, B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Detection+of+viability+of+transplanted+beta+cells+labeled+with+a+novel+contrast+agent+-+polyvinylpyrrolidone-coated+superparamagnetic+iron+oxide+nanoparticles+by+magnetic+resonance+imaging.">Detection of viability of transplanted beta cells labeled with a novel contrast agent - polyvinylpyrrolidone-coated superparamagnetic iron oxide nanoparticles by magnetic resonance imaging.</a> Contrast Media Mol Imaging. 7 (1), 35-44 (2012).</li><li>Song, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Labeling+efficacy+of+superparamagnetic+iron+oxide+nanoparticles+to+human+neural+stem+cells:+comparison+of+ferumoxides,+monocrystalline+iron+oxide,+cross-linked+iron+oxide+(CLIO)-NH2+and+tat-CLIO.">Labeling efficacy of superparamagnetic iron oxide nanoparticles to human neural stem cells: comparison of ferumoxides, monocrystalline iron oxide, cross-linked iron oxide (CLIO)-NH2 and tat-CLIO.</a> Korean J Radiol. 8 (5), 365-371 (2007).</li></ol>

The authors declare that they have no competing financial interests.

모든 나노 입자 합성 프로토콜로서, 화학 반응물의 순도는 최소한의 세포 독성 효과를 가질 것이다 고품질 SPIONs 달성을위한 중요하다. 이것은 올레산 (≥99 %), 철 (II) 클로라이드 수화물 (≥99.99 %), 철 (III) 클로라이드 (≥99.99 %), 에틸 아세테이트를 포함하여 매우 순수한 시약을 구입하는 것이 중요하다 (HPLC 등급, ≥99.9 % ), 헥산 (HPLC 등급, ≥97.0 %), 수산화 암모늄 (≥99.99 %) 및 ​​황산나트륨 (≥99.0...

Targeted delivery and capture of cells to specific sites within the body is desirable for a variety of biomedical applications. Delivery of neural stem cells to the brain by MRI-guided focused ultrasound has been proposed as a possible treatment option for neurodegenerative disease, traumatic brain injury, and stroke1. Mesenchymal stem cells are being studied for their ability to deliver anti-cancer drugs to tumors due to their natural tumor-tropic properties2,3. Cardiac stem cells have been delivered to the heart as a possible treatment for myocardial infarction4,5. Vascular stents have been developed with CD34 antibodies to capture circulating progenitor cells6. While promising, these cell targeting approaches present drawbacks including lack of cell specificity, inconsistent cell retention, and off-target cell delivery.
The overall goal of the current method is to enable magnetically directed targeting of cells for a variety of cell delivery and sorting applications. Magnetic targeting allows for controlled delivery of specific cells to a specific target site with minimal off-target effects7. The magnetic fields can be generated by implanted or external devices to safely direct the movement of magnetically-labeled cells within the body8. Numerous research efforts have focused on magnetically directed targeting of stem cells to injured tissues such as the heart9-14, retina15, lung16, skin17, spinal cord18,19, bone20, liver21, and muscle22,23 in order to improve regeneration outcomes.
Magnetic targeting of cells has also been studied extensively as a means to endothelialize implantable cardiovascular devices. A uniform and complete endothelium provides a barrier between the device and circulating blood elements to mitigate thrombosis and inflammation. Endothelial cells can be delivered to the device either prior to implantation or via the vascular system following implantation. In both cases, magnetic fields are used to capture cells to the surface of the device and retain the cells when subjected to the shear stress generated by circulating blood. Magnetic vascular stents24-27 and vascular grafts28 have both been fabricated and tested for this purpose.
Magnetic cell targeting requires a strategy for labeling cells with magnetic carrier particles. These particles can be bound to the surface of cells via antibodies or ligand/receptor pairs or they can be endocytosed into the cells. Superparamagnetic iron oxide nanoparticles (SPION) are biodegradable, biocompatible, and readily endocytosed by a variety of cell types29. These particles effectively render a cell responsive to magnetic fields and are naturally degraded over time. SPIONs provide a straightforward and safe means of magnetically labeling cells in culture for a variety of magnetic targeting and sorting applications. A method for synthesizing SPIONs with a magnetite (Fe3O4) core and poly(lactic-co-glycolic acid) (PLGA) shell is provided. In addition, a method for labeling cells in culture with SPIONs is provided.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>Ammonium Hydroxide solution, 28% NH3 in H2O, &#8805;99.99% trace metal basis</td>
			<td>Sigma-Aldrich</td>
			<td>338818-100ML&#160;</td>
			<td>Harmful reagent - wear personal protective equipment</td>
		</tr>
		<tr>
			<td>Dreschel bottle, 500 mL</td>
			<td>Ace Glass</td>
			<td>5516-16</td>
			<td></td>
		</tr>
		<tr>
			<td>Ethyl Acetate, CHROMASOLVR Plus, for HPLC, 99.9%&#160;</td>
			<td>Sigma-Aldrich</td>
			<td>650528-1L</td>
			<td>Harmful reagent - wear personal protective equipment &#38; work in fume hood</td>
		</tr>
		<tr>
			<td>Ethyl alcohol</td>
			<td>Sigma-Aldrich</td>
			<td>E7023</td>
			<td>Harmful reagent - wear personal protective equipment</td>
		</tr>
		<tr>
			<td>Filter paper, 3 cm dia, grade 1</td>
			<td>Fisher</td>
			<td>09-805P</td>
			<td>For use with glass filter funnel</td>
		</tr>
		<tr>
			<td>Glass beakers, 1 L</td>
			<td>Fisher</td>
			<td>FB-101-1000</td>
			<td>For washing SPIONs</td>
		</tr>
		<tr>
			<td>Glass filter funnel, vacuum hose adapter, fits 24/40, 30 mL</td>
			<td>Fisher</td>
			<td>K954100-0344&#160;</td>
			<td></td>
		</tr>
		<tr>
			<td>Glass vial caps</td>
			<td>Fisher</td>
			<td>03-391-46</td>
			<td>For use with glass vials</td>
		</tr>
		<tr>
			<td>Glass vials, 2 mL</td>
			<td>Fisher</td>
			<td>03-391-44</td>
			<td>For collecting magnetite gel &#38; SPIONs</td>
		</tr>
		<tr>
			<td>Hexane, CHROMASOLVR, for HPLC, &#8805;97.0% (GC)</td>
			<td>Sigma-Aldrich</td>
			<td>34859-1L&#160;</td>
			<td>Harmful reagent - wear personal protective equipment &#38; work in fume hood</td>
		</tr>
		<tr>
			<td>Hydrochloric acid</td>
			<td>Sigma-Aldrich</td>
			<td>H1758</td>
			<td>Harmful reagent - wear personal protective equipment &#38; work in fume hood</td>
		</tr>
		<tr>
			<td>Iron(II) chloride tetrahydrate, &#8805;99.99% trace metals basis&#160;</td>
			<td>Sigma-Aldrich</td>
			<td>380024-5G</td>
			<td>Harmful reagent - wear personal protective equipment</td>
		</tr>
		<tr>
			<td>Iron(III) chloride anhydrous, powder, &#8805;99.99% trace metals basis</td>
			<td>Sigma-Aldrich</td>
			<td>451649-1G</td>
			<td>Harmful reagent - wear personal protective equipment</td>
		</tr>
		<tr>
			<td>Isomantle heater, 500 mL</td>
			<td>Voight Global</td>
			<td>EM0500/CEX1</td>
			<td></td>
		</tr>
		<tr>
			<td>Laboratory mixer</td>
			<td>Silverson</td>
			<td>L5M-A</td>
			<td></td>
		</tr>
		<tr>
			<td>Lyophilizer</td>
			<td>Labconco</td>
			<td>7670520</td>
			<td></td>
		</tr>
		<tr>
			<td>Microspatulas</td>
			<td>Fisher</td>
			<td>21-401-25A</td>
			<td>For transfering magnetite gel</td>
		</tr>
		<tr>
			<td>NdFeB magnet, 1 in x 1 in x 1 in</td>
			<td>Amazing Magnets</td>
			<td>C1000H-M</td>
			<td>Very strong magnet, handle with care</td>
		</tr>
		<tr>
			<td>Oleic acid, &#8805;99% (GC)</td>
			<td>Sigma-Aldrich</td>
			<td>O1008-5G&#160;</td>
			<td>Store in freezer; Harmful reagent - wear personal protective equipment</td>
		</tr>
		<tr>
			<td>Overhead stirrer</td>
			<td>IKA</td>
			<td>2572201</td>
			<td></td>
		</tr>
		<tr>
			<td>Overhead stirrer clamp</td>
			<td>IKA</td>
			<td>2664000</td>
			<td>For use with overhead stirrer</td>
		</tr>
		<tr>
			<td>Overhead stirrer H-stand</td>
			<td>IKA</td>
			<td>1412000</td>
			<td>For use with overhead stirrer</td>
		</tr>
		<tr>
			<td>Phosphate buffered saline</td>
			<td>Life Technologies</td>
			<td>10010-023</td>
			<td></td>
		</tr>
		<tr>
			<td>Plastic beakers, 250 mL</td>
			<td>Fisher</td>
			<td>02-591-28</td>
			<td></td>
		</tr>
		<tr>
			<td>PLGA PURASORB PDLG (75/25 blend)</td>
			<td>Purac</td>
			<td>PDLG 7502</td>
			<td>PDLG 7502A may be used as well; Store in freezer</td>
		</tr>
		<tr>
			<td>Pluronic F-127 powder, BioReagent, suitable for cell culture</td>
			<td>Sigma-Aldrich</td>
			<td>P2443-250G&#160;</td>
			<td></td>
		</tr>
		<tr>
			<td>PTFE expandable blade paddle, 8 mm dia</td>
			<td>SciQuip</td>
			<td>SP4018</td>
			<td></td>
		</tr>
		<tr>
			<td>PTFE vessel adapter, fits 24/40, 8 mm dia paddle</td>
			<td>Monmouth Scientific</td>
			<td>PTFE Vessel Adaptor A480</td>
			<td>For use with PTFE expandable blade paddle</td>
		</tr>
		<tr>
			<td>Recirculating chiller</td>
			<td>Clarkson</td>
			<td>696613</td>
			<td>For use with rotoevaporator</td>
		</tr>
		<tr>
			<td>Reflux condenser, fits 24/40, 250 mm</td>
			<td>Ace Glass</td>
			<td>5997-133</td>
			<td></td>
		</tr>
		<tr>
			<td>Rotoevaporator</td>
			<td>Clarkson</td>
			<td>216949</td>
			<td></td>
		</tr>
		<tr>
			<td>Round bottom flask, 50 mL, 24/40 joint</td>
			<td>Sigma-Aldrich</td>
			<td>Z414484</td>
			<td>For use with rotoevaporator</td>
		</tr>
		<tr>
			<td>Rubber septa, fits 24/40</td>
			<td>Ace Glass</td>
			<td>9096-56</td>
			<td></td>
		</tr>
		<tr>
			<td>Separatory funnel with stopper, 250 mL</td>
			<td>Fisher</td>
			<td>10-438E</td>
			<td></td>
		</tr>
		<tr>
			<td>Sodium sulfate ACS reagent, &#8805;99.0%, anhydrous, granular</td>
			<td>Sigma-Aldrich</td>
			<td>239313-500G&#160;</td>
			<td></td>
		</tr>
		<tr>
			<td>Three neck round bottom flask, angled, 24/40 joints, 500 mL</td>
			<td>Ace Glass</td>
			<td>6948-16</td>
			<td></td>
		</tr>
		<tr>
			<td>Ultrasonic cleaner perforated pan</td>
			<td>Fisher</td>
			<td>15-335-20A</td>
			<td>For use with ultrasonic cleaner</td>
		</tr>
		<tr>
			<td>Ultrasonic cleaner, 2.8 L</td>
			<td>Fisher</td>
			<td>15-335-20</td>
			<td></td>
		</tr>
		<tr>
			<td>Vacuum controller</td>
			<td>Clarkson</td>
			<td>216639</td>
			<td>For use with rotoevaporator (optional)</td>
		</tr>
		<tr>
			<td>Vacuum pump</td>
			<td>Clarkson</td>
			<td>219959</td>
			<td>For use with rotoevaporator</td>
		</tr>
	</tbody>
</table>

cell labeling and targeting with superparamagnetic iron oxide nanoparticles

세포 치료제의 표적 전달이 오프 - 표적 부위에 악영향을 최소화하면서 목표 부위에 치료 효과를 집중하여 의치 광범위한 애플리케이션 혜택 것이다. 자기 세포 타겟팅, 효율적인 안전하고 간단 전달 기술이다. 초상 자성 산화철 나노 입자 (SPION)은 생체 적합성, 생분해 성이며, 자기장에 응답들을 렌더링하기 위해 세포로 endocytosed 수있다. 합성 과정은 마그네타이트 FE (3 O 4)를 생성하는 것을 포함하는 폴리 (락트산 - 코 - 글리콜 산) (PLGA) 코팅을 형성하는 고속 유화 나노 입자. PLGA-마그네타이트 SPIONs는 약 10 nm의 직경을 포함 마그네타이트 코어 직경이 약 12​​0 나노 미터이다. 문화 매체에 배치 할 때, SPIONs 자연스럽게 세포에 의해 endocytosed 및 세포질 엔도 좀 내 작은 클러스터로 저장됩니다. 이들 입자는 세포에 충분한 질량을 부여 자성자기장 내에서 대상을 허용합니다. 수많은 세포 정렬 및 대상 응용 프로그램은 자기장에 반응하는 다양한 세포 유형을 렌더링하여 사용할 수 있습니다. SPIONs뿐만 아니라 종양 치료 또는 조직 솔더링 로컬 고열증의 의료 영상 조영제로 사용, 표적 유전자 또는 약물 전달, 진단 분석 및 생성을 포함하는 다른 생물 의학 다양한 애플리케이션을 갖는다.

마그네타이트 나노 입자는 50 ℃, 1000 rpm으로 (도 1) 및 철 (III) 클로라이드, 철 (II) 클로라이드 수화물 수용액을 교반 한 결과, 직경이 약 10 나노 미터이다. 이러한 결과는 마그네타이트 나노 입자가 성공적으로 합성을 보여준다. 이것은 처음으로 합성을 시도 할 때의 배치 작은 샘플로부터 취한 마그네타이트 나노 입자의 크기와 모양을 확인하는 것이 중요하다. 투과 전자 현미경 (TEM)?...

Watch this Scientific Journal Video about Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles at JoVE.com

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Targeted cell delivery is useful in a variety of biomedical applications. The goal of this protocol is to use superparamagnetic iron oxide nanoparticles (SPION) to label cells and thereby enable magnetic cell targeting approaches for a high degree of control over cell delivery and localization.

셀 라벨 및 초상 자성 산화철 나노 입자로 타겟팅

Targeted delivery of cells and therapeutic agents would benefit a wide range of biomedical applications by concentrating the therapeutic effect at the ...

cell-labeling-targeting-with-superparamagnetic-iron-oxide

Research

JoVE Journal

Bioengineering

11.9K 조회수.  Mayo Clinic. Targeted cell delivery is useful in a variety of biomedical applications. The goal of this protocol is to use superparamagnetic iron oxide nanoparticles (SPION) to label cells and thereby enable magnetic cell targeting approaches for a high degree of control over cell delivery and localization.

비디오: Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Production and Targeting of Monovalent Quantum Dots

The multivalent nature of commercial quantum dots (QDs) and the difficulties associated with producing monovalent dots have limited their applications in biology, where clustering and the spatial organization of biomolecules is often the object of study. We describe here a protocol to produce monovalent quantum dots (mQDs) that can be accomplished in most biological research laboratories via a simple mixing of CdSe/ZnS core/shell QDs with phosphorothioate DNA (ptDNA) of defined length. After a single ptDNA strand has wrapped the QD, additional strands are excluded from the surface. Production of mQDs in this manner can be accomplished at small and large scale, with commercial reagents, and in minimal steps. These mQDs can be specifically directed to biological targets by hybridization to a complementary single stranded targeting DNA. We demonstrate the use of these mQDs as imaging probes by labeling SNAP-tagged Notch receptors on live mammalian cells, targeted by mQDs bearing a benzylguanine moiety.

We provide detailed instructions for the preparation of monovalent targeted quantum dots (mQDs) from phosphorothioate DNA of defined length. DNA wrapping occurs in high yield, and therefore, products do not require purification. We demonstrate the use of the SNAP tag to target mQDs to cell-surface receptors for live-cell imaging applications.

생산 및 일가 양자점 타겟팅

The multivalent nature of commercial quantum dots (QDs) and the difficulties associated with producing monovalent dots have limited their applications in ...

연구

생체공학

Fabrication of a Functionalized Magnetic Bacterial Nanocellulose with Iron Oxide Nanoparticles

In this study, bacterial nanocellulose (BNC) produced by the bacteria Gluconacetobacter xylinus is synthesized and impregnated in situ with iron oxide nanoparticles (IONP) (Fe3O4) to yield a magnetic bacterial nanocellulose (MBNC). The synthesis of MBNC is a precise and specifically designed multi-step process. Briefly, bacterial nanocellulose (BNC) pellicles are formed from preserved G. xylinus strain according to our experimental requirements of size and morphology. A solution of iron(III) chloride hexahydrate (FeCl3&#183;6H2O) and iron(II) chloride tetrahydrate (FeCl2&#183;4H2O) with a 2:1 molar ratio is prepared and diluted in deoxygenated high purity water. A BNC pellicle is then introduced in the vessel with the reactants. This mixture is stirred and heated at 80 &#176;C in a silicon oil bath and ammonium hydroxide (14%) is then added by dropping to precipitate the ferrous ions into the BNC mesh. This last step allows forming in situ magnetite nanoparticles (Fe3O4) inside the bacterial nanocellulose mesh to confer magnetic properties to BNC pellicle. A toxicological assay was used to evaluate the biocompatibility of the BNC-IONP pellicle. Polyethylene glycol (PEG) was used to cover the IONPs in order to improve their biocompatibility. Scanning electron microscopy (SEM) images showed that the IONP were located preferentially in the fibril interlacing spaces of the BNC matrix, but some of them were also found along the BNC ribbons. Magnetic force microscope measurements performed on the MBNC detected the presence magnetic domains with high and weak intensity magnetic field, confirming the magnetic nature of the MBNC pellicle. Young&#39;s modulus values obtained in this work are also in a reasonable agreement with those reported for several blood vessels in previous studies.

Here, we present a protocol to make a bacterial nanocellulose (BNC) magnetic for applications in damaged blood vessel reconstruction. The BNC was synthesized by G. xylinus strain. On the other hand, magnetization of the BNC was realized through in situ precipitation of Fe2+ and Fe3+ ferrous ions inside the BNC mesh.

철 산화물 나노 입자와 기능화 자기 세균 Nanocellulose의 제작

In this study, bacterial nanocellulose (BNC) produced by the bacteria Gluconacetobacter xylinus is synthesized and impregnated in situ with iron oxide ...

Solid Lipid Nanoparticles (SLNs) for Intracellular Targeting Applications

Nanoparticle-based delivery vehicles have shown great promise for intracellular targeting applications, providing a mechanism to specifically alter cellular signaling and gene expression. In a previous investigation, the synthesis of ultra-small solid lipid nanoparticles (SLNs) for topical drug delivery and biomarker detection applications was demonstrated. SLNs are a well-studied example of a nanoparticle delivery system that has emerged as a promising drug delivery vehicle. In this study, SLNs were loaded with a fluorescent dye and used as a model to investigate particle-cell interactions. The phase inversion temperature (PIT) method was used for the synthesis of ultra-small populations of biocompatible nanoparticles. A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenylphenyltetrazolium bromide (MTT) assay was utilized in order to establish appropriate dosing levels prior to the nanoparticle-cell interaction studies. Furthermore, primary human dermal fibroblasts and mouse dendritic cells were exposed to dye-loaded SLN over time and the interactions with respect to toxicity and particle uptake were characterized using fluorescence microscopy and flow cytometry. This study demonstrated that ultra-small SLNs, as a nanoparticle delivery system, are suitable for intracellular targeting of different cell types.

Solid Lipid Nanoparticles SLNs for Intracellular Targeting Applications

In this study, a method for synthesizing ultra-small populations of biocompatible nanoparticles was described, as well as several in vitro methods by which to assess their cellular interactions.

고체 지질 나노 입자 (SLNs) 세포 내 타겟팅을위한 응용 프로그램

Nanoparticle-based delivery vehicles have shown great promise for intracellular targeting applications, providing a mechanism to specifically alter ...

Identification of Metal Oxide Nanoparticles in Histological Samples by Enhanced Darkfield Microscopy and Hyperspectral Mapping

Nanomaterials are increasingly prevalent throughout industry, manufacturing, and biomedical research. The need for tools and techniques that aid in the identification, localization, and characterization of nanoscale materials in biological samples is on the rise. Currently available methods, such as electron microscopy, tend to be resource-intensive, making their use prohibitive for much of the research community. Enhanced darkfield microscopy complemented with a hyperspectral imaging system may provide a solution to this bottleneck by enabling rapid and less expensive characterization of nanoparticles in histological samples. This method allows for high-contrast nanoscale imaging as well as nanomaterial identification. For this technique, histological tissue samples are prepared as they would be for light-based microscopy. First, positive control samples are analyzed to generate the reference spectra that will enable the detection of a material of interest in the sample. Negative controls without the material of interest are also analyzed in order to improve specificity (reduce false positives). Samples can then be imaged and analyzed using methods and software for hyperspectral microscopy or matched against these reference spectra in order to provide maps of the location of materials of interest in a sample. The technique is particularly well-suited for materials with highly unique reflectance spectra, such as noble metals, but is also applicable to other materials, such as semi-metallic oxides. This technique provides information that is difficult to acquire from histological samples without the use of electron microscopy techniques, which may provide higher sensitivity and resolution, but are vastly more resource-intensive and time-consuming than light microscopy.

Enhanced darkfield microscopy and hyperspectral imaging with spectral mapping enable screening, localization, and identification of nanoscale materials in histological samples with improved speed and accuracy over traditional methods. The goal of this paper is to provide methods for darkfield imaging and hyperspectral mapping of metal oxide nanoparticles in histological samples.

향상된 암시 야 현미경 및 초 분광 매핑하여 조직 학적 샘플에서 금속 산화물 나노 입자의 식별

Nanomaterials are increasingly prevalent throughout industry, manufacturing, and biomedical research. The need for tools and techniques that aid in the ...

Microwave-driven Synthesis of Iron Oxide Nanoparticles for Fast Detection of Atherosclerosis

A fast and reproducible microwave-driven protocol has been developed for the synthesis of neridronate-functionalized nanoparticles. Starting from the synthesis of hydrophobic nanoparticles, our method is based on an adaptation from thermal decomposition method to microwave driven synthesis. The new methodology produces a decrease in the reaction times in comparison with traditional procedures. Moreover, the use of the microwave technology increases the reproducibility of the reactions, something important from the point of view of clinical applications. The novelty of this iron oxide nanoparticle is the attachment of Neridronate. The use of this molecule leads a bisphosphonate moiety towards the outside of the nanoparticle that provides Ca2+ binding properties in vitro and selective accumulation in vivo in the atheroma plaque. The protocol allows the synthesis and plaque detection in about 3 hr since the initial synthesis from organic precursors. Their accumulation in the atherosclerotic area in less than 1 hr provides a contrast agent particularly suitable for clinical applications.

Microwave technology enables extremely fast synthesis of iron oxide nanoparticles for atherosclerosis plaque characterization. The use of an aminobisphosphonate in the external side of the nanoparticle provides a fast accumulation in the atherosclerotic area.

동맥 경화의 빠른 검색을위한 산화철 나노 입자의 전자 레인지 중심의 합성

A fast and reproducible microwave-driven protocol has been developed for the synthesis of neridronate-functionalized nanoparticles. Starting from the ...

Initial Evaluation of Antibody-conjugates Modified with Viral-derived Peptides for Increasing Cellular Accumulation and Improving Tumor Targeting

Antibody-conjugates (ACs) modified with virus-derived peptides are a potentially powerful class of tumor cell delivery agents for molecular payloads used in cancer treatment and imaging due to increased cellular accumulation over current ACs. During early AC in vitro development, fluorescence techniques and radioimmunoassays are sufficient for determining intracellular localization, accumulation efficiency, and target cell specificity. Currently, there is no consensus on standardized methods for preparing cells for evaluating AC intracellular accumulation and localization. The initial testing of ACs modified with virus-derived peptides is critical especially if several candidates have been constructed. Determining intracellular accumulation by fluorescence can be affected by background signal from ACs at the cell surface and complicate the interpretation of accumulation. For radioimmunoassays, typically treated cells are fractionated and the radioactivity in different cell compartments measured. However, cell lysis varies from cell to cell and often nuclear and cytoplasmic compartments are not adequately isolated. This can produce misleading data on payload delivery properties. The intravenous injection of radiolabeled virus-derived peptide-modified ACs in tumor bearing mice followed by radionuclide imaging is a powerful method for determining tumor targeting and payload delivery properties at the in vivo phase of development. However, this is a relatively recent advancement and few groups have evaluated virus-derived peptide-modified ACs in this manner. We describe the processing of treated cells to more accurately evaluate virus-derived peptide-modified AC accumulation when using confocal microscopy and radioimmunoassays. Specifically, a method for trypsinizing cells to remove cell surface bound ACs. We also provide a method for improving cellular fractionation. Lastly, this protocol provides an in vivo method using positron emission tomography (PET) for evaluating initial tumor targeting properties in tumor-bearing mice. We use the radioisotope 64Cu (t1/2 = 12.7 h) as an example payload in this protocol.

Viral-derived peptides coupled to antibody-conjugates (ACs) is an approach gaining momentum due to the potential of delivering molecular payloads with increased tumor cell accumulation. Utilizing common methods to evaluate peptide conjugation, AC and payload intracellular accumulation, and tumor targeting, this protocol helps researchers during the key initial development phases.

세포 축적을 증가 하 고 종양을 대상으로 개선에 대 한 바이러스 성 파생 된 펩 티 드 항 체 어원이 같은 말의 초기 평가 수정

Antibody-conjugates (ACs) modified with virus-derived peptides are a potentially powerful class of tumor cell delivery agents for molecular payloads used ...

Protocol for MicroRNA Transfer into Adult Bone Marrow-derived Hematopoietic Stem Cells to Enable Cell Engineering Combined with Magnetic Targeting

While CD133+ hematopoietic stem cells (SCs) have been proven to provide high potential in the field of regenerative medicine, their low retention rates after injection into injured tissues as well as the observed massive cell death rates lead to very restricted therapeutic effects. To overcome these limitations, we sought to establish a non-viral based protocol for suitable cell engineering prior to their administration. The modification of human CD133+ expressing SCs using microRNA (miR) loaded magnetic polyplexes was addressed with respect to uptake efficiency and safety as well as the targeting potential of the cells. Relying on our protocol, we can achieve high miR uptake rates of 80&#8211;90% while the CD133+ stem cell properties remain unaffected. Moreover, these modified cells offer the option of magnetic targeting. We describe here a safe and highly efficient procedure for the modification of CD133+ SCs. We expect this approach to provide a standard technology for optimization of therapeutic stem cell effects and for monitoring of the administered cell product via magnetic resonance imaging (MRI).

This protocol illustrates a safe and efficient procedure to modify CD133+ hematopoietic stem cells. The presented non-viral, magnetic polyplex-based approach may provide a basis for the optimization of therapeutic stem cell effects as well as for monitoring the administered cell product via magnetic resonance imaging.

성인 골 수 유래 조 혈 줄기 세포로 세포 공학 자기 대상으로 함께 있도록 예측에 관한 전송을 위한 프로토콜

While CD133+ hematopoietic stem cells (SCs) have been proven to provide high potential in the field of regenerative medicine, their low retention rates ...

Catalytic Scavenging of Plant Reactive Oxygen Species In Vivo by Anionic Cerium Oxide Nanoparticles

Reactive oxygen species (ROS) accumulation is a hallmark of plant abiotic stress response. ROS play&#160;a dual role in plants by acting as signaling molecules at low levels and damaging molecules at high levels. Accumulation of ROS in stressed plants can damage metabolites, enzymes, lipids, and DNA, causing a reduction of plant growth and yield. The ability of cerium oxide nanoparticles (nanoceria) to catalytically scavenge ROS in vivo provides a unique tool to understand and bioengineer plant abiotic stress tolerance. Here, we present a protocol to synthesize and characterize poly (acrylic) acid coated nanoceria (PNC), interface the nanoparticles with plants via leaf lamina infiltration, and monitor their distribution and ROS scavenging in vivo using confocal microscopy. Current molecular tools for manipulating ROS accumulation in plants are limited to model species and require laborious transformation methods. This protocol for in vivo ROS scavenging has the potential to be applied to wild type plants with broad leaves and leaf structure like Arabidopsis thaliana.

Catalytic Scavenging of Plant Reactive Oxygen Species In Vivo by Anionic Cerium Oxide Nanoparticles

Here, we present a protocol for the synthesis and characterization of cerium oxide nanoparticles (nanoceria) for ROS (reactive oxygen species) scavenging in vivo, nanoceria imaging in plant tissues by confocal microscopy, and in vivo monitoring of nanoceria ROS scavenging by confocal microscopy.

식물 반응 산소 종에서 Vivo에서 음이온 세 륨 산화물 나노 입자의 촉매 청소

Reactive oxygen species (ROS) accumulation is a hallmark of plant abiotic stress response. ROS play&#160;a dual role in plants by acting as signaling ...

Screening and Identification of Small Peptides Targeting Fibroblast Growth Factor Receptor2 using a Phage Display Peptide Library

The human Fibroblast Growth Factor Receptor (FGFR) family comprises four members, namely, FGFR1, FGFR2, FGFR3, and FGFR4, that are involved in various biological activities including cell proliferation, survival, migration and differentiation. Several aberrations in the FGFR signaling pathway, owing to mutations or gene amplification events, have been identified in various types of cancers. Hence, recent research has focused on developing strategies involving therapeutic targeting of FGFRs. Current FGFR inhibitors at various stages of pre-clinical and clinical development include either small molecule inhibitors of tyrosine kinases or monoclonal antibodies, with only a few peptide- based inhibitors in the pipeline. Here, we provide a protocol using phage display technology to screen small peptides as antagonists of FGFR2. Briefly, a library of phage-displayed peptides was incubated in a plate coated with FGFR2. Subsequently, unbound phage was washed off by TBST (TBS + 0.1% [v/v] Tween-20), and bound phage was eluted with 0.2 M glycine-HCl buffer (pH 2.2). The eluted phage was further amplified and used as input for the next round of biopanning. Following three rounds of biopanning, the peptide sequences of individual phage clones were identified by DNA sequencing. Finally, the screened peptides were synthesized and analyzed for affinity and biological activity.

Herein, we present a detailed protocol for screening small peptides that bind to FGFR2 using a phage display peptide library. We further analyze the affinity of the selected peptides toward FGFR2 in vitro and its ability to suppress cell proliferation.

파지 디스플레이 펩타이드 라이브러리를 사용하여 섬유아세포 성장 인자 수용체2를 표적으로 하는 소형 펩타이드의 스크리닝 및 식별

The human Fibroblast Growth Factor Receptor (FGFR) family comprises four members, namely, FGFR1, FGFR2, FGFR3, and FGFR4, that are involved in various ...

Using Magnetometry to Monitor Cellular Incorporation and Subsequent Biodegradation of Chemically Synthetized Iron Oxide Nanoparticles

Magnetic nanoparticles, made of iron oxide, present a peculiar interest for a wide range of biomedical applications for which they are often internalized in cells and then left within. One challenge is to assess their fate in the intracellular environment with reliable and precise methodologies. Herein, we introduce the use of the vibrating sample magnetometer (VSM) to precisely quantify the integrity of magnetic nanoparticles within cells by measuring their magnetic moment. Stem cells are first labeled with two types of magnetic nanoparticles; the nanoparticles have the same core produced via a fast and efficient microwave-based nonaqueous sol gel synthesis and differ in their coating: the commonly used citric acid molecule is compared to polyacrylic acid. The formation of 3D cell-spheroids is then achieved via centrifugation and the magnetic moment of these spheroids is measured at different times with the VSM. The obtained moment is a direct fingerprint of the nanoparticles&#8217; integrity, with decreasing values indicative of a nanoparticle degradation. For both nanoparticles, the magnetic moment decreases over culture time revealing their biodegradation. A protective effect of the polyacrylic acid coating is also shown, when compared to citric acid.

Iron oxide nanoparticles are synthesized via a nonaqueous sol gel procedure and coated with anionic short molecules or polymer. The use of magnetometry for monitoring the incorporation and biotransformations of magnetic nanoparticles inside human stem cells is demonstrated using a vibrating sample magnetometer (VSM).

자기 측정을 사용하여 화학적으로 합성된 산화철 나노 입자의 세포 통합 및 후속 생분해를 모니터링합니다.

Magnetic nanoparticles, made of iron oxide, present a peculiar interest for a wide range of biomedical applications for which they are often internalized ...