우리의 연구는 NIH, 국립 안과 연구소의 교내 연구 프로그램에 의해 지원됩니다.

사용된 모든 장비와 시약이 멸균됩니다. 프로토콜은 동물 케어 승인 및 (동물 연구 프로토콜 네이 - 553) 네이 / NIH에서위원회 (ACUC)를 사용하고, NIH의 지침과 규정에 따라 수행였습니다. 1. angiogenic 요인 함유 알약을 생산 이 부분에 관심 angiogenic 요인을 포함하고있는 알약을 준비하고 있습니다. <ol><li> 10 % (W / V) PBS로 sucralfate 솔루션을 확인하십시오. 실온 하에서 보관하십시오. </li><li> 12% (W / V) 절대 에탄올과 쓰임새 HEMA하십시오. 실온 하에서 보관하십시오. </li><li> 1 μg / μl bFGF 솔루션을 확인하십시오. -80에 저장 ° C. </li><li> 50 알약을 만들기 위해 sucralfate와 bFGF 주식 솔루션 4 μl의 1μl 폴리 - HEMA 5 μl, 철저하게 소용돌이를 섞는다. </li><li> 배양 접시에있는 깨끗한 parafilm 조각을 장소, 조직 문화 후드에서 15 분 자외선 아래로 노출. 한 펠렛에 대한 parafilm에 솔루션 혼합물의 0.2 μl를 버려라. 따라서 솔루션 혼합물의 10 μl 50 알약을 얻을 것입니다. 1-2시간 위해 상온에서 산탄이 건조하자. 마른 쥐똥은 ° C 몇 달 동안 몇 일, 또는 -80 4 OC에 저장할 수 있습니다. </li><li> 사용시, 캐내다와 포셉 한 켤레의 도움말로 알약을 픽업. 그들을 아프게하거나 멀리 봄하게하지 않도록 각별히주의하십시오. </li></ol> 2. 마우스 각막 포켓 분석을 수행 이 부분에서, 우리는 주머니에 펠렛를 삽입하는 방법을 마우스 각막에 주머니 만드는 방법을 보여, 그리고 것입니다. 펠렛에 포함된 angiogenic 요인은 각막의 주변 지역 (그림 1) 점진적으로 공개됩니다. 이 예제에서, 우리는 8 주 여성 C57/Bl6 마우스를 사용합니다. <ol><li> 마우스 마취제 (75 MG / kg)과 xylazine (5mg/kg, IP 사출)의 혼합물과 함께 체계적으로 깊이 anesthetized입니다. 이것은 30-60 분 마취 상태에서 마우스를 계속합니다. 국소 마취 (0.5 % proparacaine HCL)은 각막에 적용됩니다. 5 분 후, 해부 현미경으로 눈 하나 수정. </li><li> 매우 부드러운 상처는 본 Graefe 백내장의 칼로 각막 limbus (그림 1 그림)에서 각막 1.2 -1.4 mm의 중간에 이루어집니다. 각막을 건드리지 않게 매우주의하십시오. </li><li> 포켓은 수평 각막의 중간에 칼을 삽입하고 limbus 신중 (Fig.1)쪽으로 칼을 확장하여 각막의 상피 층 아래에​​ 이루어집니다. 주머니의 크기는 한 angiogenic 요인 함유 펠렛을 수용할 정도로 큰 수 있습니다. 아니라 각막을 통해 펑크 매우주의하십시오. </li><li> 천천히 주머니에 포셉 한 쌍의와 펠렛을 넣습니다. 가능한 한 평면으로 펠렛을 만들어보십시오. </li><li> 펠렛의 주입 후 국소 안과 항생제 연고가 눈에에 적용됩니다. 악기 동물 사이에 70 % 알코올 패드로 닦아 있습니다. </li><li> 그것이 똑바로 자세를 유지하고 다음의 홈 케이지로 돌아갈 수 때까지 따뜻하고 건조한 지역에 마우스를 이동하고 모니터링합니다. 체계적 진통제 (예, buprenorphine, 2 MG / kg, IP 주입) 및 국소 항생 연고 (예 : gentamicin) 수술 후 2 일 회 제공되며 마우스가 밀접하게 3 일간 모니터링합니다. 힐링은 처음 48 시간 이내에 수술 완료 예정입니다. 주머니에있는 안과는 펠렛 주입 후 4~10일 사이에 슬릿 램프 biomicro 범위에 따라 검사한다. </li></ol> 3. 대표 결과 <ol><li> 펠렛 주입 후 이레는 마우스 systemically과 몸에 붙이기로 2.1에 설명된 anesthetized 있습니다. </li><li> 해부 현미경 angiogenic 요인에 의해 유도된 각막에 혈관을 관찰. 차량 대우 각막에는 아무런 혈관의 성장은 (그림 2A, 차량 취급 각막) 관찰 수 없습니다. bFGF 대우 각막에서 강력한 angiogenesis는 (그림 2B) 볼 수 있습니다. 혈관의 성장은 혈관 (새로운 혈관의 맨 ​​정상 limbal 혈관에서), 그리고 전체 혈관 영역 (그림 2B, bFGF에 빨간색 점선과 delineated의 최대 길이를 사용하여 평가 수 ) 각막 - 처리. 기타 부량 방법도 2,5 설명하고 있습니다. </li></ol><img src="/files/ftp_upload/3077/3077fig1.jpg" alt="그림 1" /> 그림 1. H &amp; E의 얼룩과 함께. 정상 각막. 대한 혈관은 정상 각막에 존재하지 않습니다. B는. 각막의. C 상피 층 아래에 주머니하십시오. 주머니에 펠렛을 삽입할 수 있습니다. D. angiogenic 요인은 펠렛에서 풀려나, 새로운 혈관은 정상 혈관 limbal에서 성장합니다. <img src="/files/ftp_upload/3077/3077fig2.jpg" alt="그림 2" /> 그림 2. 오일 메신저 후 대표 결과펠렛의 농장.. 전용 차량을 포함한 펠렛과 함께 각막. 각막에 새로운 혈관 형성하지 않습니다. 단지 기존 일반 limbal 선박 볼 수 있습니다. B는. 펠렛 함유 bFGF와 각막. 강력한 새로운 혈관 (도트 늘어선) 기존의 일반 limbal 선박에서 자랐습니다.

<ol>
	<li>Cao, Y., Linden, P., Shima, D., Browne, F., Folkman, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+vivo+angiogenic+activity+and+hypoxia+induction+of+heterodimers+of+placenta+growth+factor/vascular+endothelial+growth+factor.">In vivo angiogenic activity and hypoxia induction of heterodimers of placenta growth factor/vascular endothelial growth factor.</a> The Journal of clinical investigation. 98, 2507-2511 (1996).</li><li>Rogers, M. S., Birsner, A. E., D'Amato, R. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+mouse+cornea+micropocket+angiogenesis+assay.">The mouse cornea micropocket angiogenesis assay.</a> Nature. 2, 2545-2550 (2007).</li><li>Poche, R. A., Saik, J. E., West, J. L., Dickinson, M. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+mouse+cornea+as+a+transplantation+site+for+live+imaging+of+engineered+tissue+constructs.">The mouse cornea as a transplantation site for live imaging of engineered tissue constructs.</a> Cold Spring Harbor protocols. , 5416-54 (2010).</li><li>Zhang, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=VEGF-B+is+dispensable+for+blood+vessel+growth+but+critical+for+their+survival,+and+VEGF-B+targeting+inhibits+pathological+angiogenesis.">VEGF-B is dispensable for blood vessel growth but critical for their survival, and VEGF-B targeting inhibits pathological angiogenesis.</a> Proceedings of the National Academy of Sciences of the United States of America. , 106-6152 (2009).</li><li>Tong, S., Yuan, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dose+response+of+angiogenesis+to+basic+fibroblast+growth+factor+in+rat+corneal+pocket+assay:+I.+Experimental+characterizations.">Dose response of angiogenesis to basic fibroblast growth factor in rat corneal pocket assay: I. Experimental characterizations.</a> Microvascular research. 75, 10-15 (2008).</li><li>Muthukkaruppan, V., Auerbach, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Angiogenesis+in+the+mouse+cornea.">Angiogenesis in the mouse cornea.</a> Science. 205, 1416-1418 (1979).</li><li>Ziche, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Corneal+assay+for+angiogenesis.">Corneal assay for angiogenesis.</a> Methods in molecular medicine. 46, 131-142 (2001).</li><li>Ziche, M., Morbidelli, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+corneal+pocket+assay.">The corneal pocket assay.</a> Methods in molecular biology. 467, 319-329 (2009).</li></ol>

관심 없음 충돌 선언하지 않습니다.

마우스 각막 포켓 분석 모델을 먼저 Muthukkaruppan VR 및 아우어 바흐 R 6 1979 년에 설명했다. 자세한 프로토콜은 다른 실험실 2,3,7,8에 의해 공개되었습니다. 저희 연구실은 몇 년 4 수정 및 우리의 연구에이 방법을 사용하고 있습니다. 마우스 각막 포켓 검정 좋은 재현성있는 비교적 간단한 모델입니다. 이 모델의 또 다른 장점은 각막이 정상적으로 혈관 부족 때문에,이 분석의 ...

<table border="1"><tbody><tr><th> 장비 </th><th> 회사 </th><th> 카탈로그 번호 </th></tr><tr><td> 해부 현미경 </td><td> 세계 정밀 계측기 </td><td> PZMIV - BS </td></tr><tr><td> 본 Graefe 백내장 나이프 (1.5x25mm 블레이드, 평면) </td><td> 앰블러 외과 </td><td> 3401E </td></tr><tr><td> 더몬트 # 5 포셉 </td><td> 파인 과학 도구 </td><td> 11252-50 </td></tr><tr><td> 슬릿 램프 </td><td> 자이스 혈구 </td><td> 30 SL - M </td></tr></tbody></table> 표 1. 장비 <table border="1"><tbody><tr><th> 시약 </th><th> 회사 </th><th> 카탈로그 # </th><th> 댓글 </th></tr><tr><td> bFGF (기본 fibroblast의 성장 인자) </td><td> PEPROTECH (주) </td><td> 100 - 18B </td><td></td></tr><tr><td> Sucralfate (자당 octasulfate - 알루미늄 복합) </td><td> 시그마 </td><td> S0652 </td><td> PBS에서 10 % </td></tr><tr><td> 폴리 - HEMA (폴리 (히드록시 에틸 메타 크릴 레이트 2)) </td><td> 시그마 </td><td> P3932 </td><td> 에탄올에 12% </td></tr></tbody></table> 표 2. 시약 및 재료

a mouse model of the cornea pocket assay for angiogenesis study

정상 각막은 혈관 조직이 분명하다. 그러나 혈관이 강력한 angiogenic 요인이 1을 투여하는 각막의 성장과 생존을 유도하실 수 있습니다. 이 독특한는 각막 포켓 분석 angiogenesis 연구에 대해 가장 많이 사용되는 모델 중 하나가되었다. 각막은 세포의 여러 레이어를 작곡. 그것은 angiogenic 효과 2,3를 조사하기 위해 각막에 대한 관심의 angiogenic 요인을 포함한 펠렛를 포함하는 것이 가능합니다. 여기, 우리는 (I)는 angiogenic 요인 함유 펠렛 (II)을 (III)의 관심 angiogenic 요인에 의해 유발 angiogenesis를 분석 각막에 펠렛을 포함을 생산하는 방법의 단계 시범에 의해 단계를 제공합니다. 기본 fibroblast의 성장 인자 (bFGF)가 가장 강력한 angiogenic 요인 4의 하나로 알려져 있기 때문에, 그것은 각막에 angiogenesis를 유도 여기에 사용됩니다.

Watch this Scientific Journal Video about A Mouse Model of the Cornea Pocket Assay for Angiogenesis Study at JoVE.com

A Mouse Model of the Cornea Pocket Assay for Angiogenesis Study

각막은 혈관 조직이 부족한다는 점에서 고유합니다. 그러나, 강력한 혈관의 성장과 생존은 강력한 angiogenic 요인에 의해 각막에 유도된 수 있습니다. 따라서 각막이 우리와 함께 angiogenic 연구 가치있는 도구를 제공할 수 있습니다. 이 프로토콜은 각막 포켓 분석 방법과이 모델을 사용 angiogenic 요인에 의해 유발 angiogenesis을 평가의 마우스 모델을 수행하는 방법을 보여줍니다.

Angiogenesis 연구에 대한 각막 포켓 분석의 마우스 모델

A normal cornea is clear of vascular tissues. However, blood vessels can be induced to grow and survive in the cornea when potent angiogenic factors are ...

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15.9K 조회수.  National Eye Institute. 각막은 혈관 조직이 부족한다는 점에서 고유합니다. 그러나, 강력한 혈관의 성장과 생존은 강력한 angiogenic 요인에 의해 각막에 유도된 수 있습니다. 따라서 각막이 우리와 함께 angiogenic 연구 가치있는 도구를 제공할 수 있습니다. 이 프로토콜은 각막 포켓 분석 방법과이 모델을 사용 angiogenic 요인에 의해 유발 angiogenesis을 평가의 마우스 모델을 수행하는 방법?...

비디오: A Mouse Model of the Cornea Pocket Assay for Angiogenesis Study

Biomarkers in an Animal Model for Revealing Neural, Hematologic, and Behavioral Correlates of PTSD

Identification of biomarkers representing the evolution of the pathophysiology of Post Traumatic Stress Disorder (PTSD) is vitally important, not only for objective diagnosis but also for the evaluation of therapeutic efficacy and resilience to trauma. Ongoing research is directed at identifying molecular biomarkers for PTSD, including traumatic stress induced proteins, transcriptomes, genomic variances and genetic modulators, using biologic samples from subjects' blood, saliva, urine, and postmortem brain tissues. However, the correlation of these biomarker molecules in peripheral or postmortem samples to altered brain functions associated with psychiatric symptoms in PTSD remains unresolved. Here, we present an animal model of PTSD in which both peripheral blood and central brain biomarkers, as well as behavioral phenotype, can be collected and measured, thus providing the needed correlation of the central biomarkers of PTSD, which are mechanistic and pathognomonic but cannot be collected from people, with the peripheral biomarkers and behavioral phenotypes, which can.
Our animal model of PTSD employs restraint and tail shocks repeated for three continuous days - the inescapable tail-shock model (ITS) in rats. This ITS model mimics the pathophysiology of PTSD 17, 7, 4, 10. We and others have verified that the ITS model induces behavioral and neurobiological alterations similar to those found in PTSD subjects 17, 7, 10, 9. Specifically, these stressed rats exhibit (1) a delayed and exaggerated startle response appearing several days after stressor cessation, which given the compressed time scale of the rat's life compared to a humans, corresponds to the one to three months delay of symptoms in PTSD patients (DSM-IV-TR PTSD Criterian D/E 13), (2) enhanced plasma corticosterone (CORT) for several days, indicating compromise of the hypothalamopituitary axis (HPA), and (3) retarded body weight gain after stressor cessation, indicating dysfunction of metabolic regulation.
The experimental paradigms employed for this model are: (1) a learned helplessness paradigm in the rat assayed by measurement of acoustic startle response (ASR) and a charting of body mass; (2) microdissection of the rat brain into regions and nuclei; (3) enzyme-linked immunosorbent assay (ELISA) for blood levels of CORT; (4) a gene expression microarray plus related bioinformatics tools 18. This microarray, dubbed rMNChip, focuses on mitochondrial and mitochondria-related nuclear genes in the rat so as to specifically address the neuronal bioenergetics hypothesized to be involved in PTSD.

We describe a rat model of post traumatic stress disorder (PTSD) that reveals the persistent alterations in neuroendocrine function and the delayed long-term, exaggerated fear response, characteristic of PTSD patients. The animal model and methods described here are useful for correlating biomarkers in brain nuclei, which are mechanistic but cannot be measured in patients, with biomarkers in peripheral white blood cells, which can.

PTSD의, 신경 Hematologic, 그리고 행동 상관 관계를 누설하는 행위에 대해서는 동물 모델에서 생체

Identification of biomarkers representing the evolution of the pathophysiology of Post Traumatic Stress Disorder (PTSD) is vitally important, not only for ...

연구

의학

Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy

Neuroendocrine tumors (NETs) are rare tumors, with an incidence of two per 100,&#x200A;000 individuals per year, and they account for 0.5% of all human malignancies.1 Other than surgery for the minority of patients who present with localized disease, there is little or no survival benefit of systemic therapy. Therefore, there is a great need to better understand the biology of NETs, and in particular define new therapeutic targets for patients with nonresectable or metastatic neuroendocrine tumors. 3D cell culture is becoming a popular method for drug screening due to its relevance in modeling the in vivo tumor tissue organization and microenvironment.2,3 The 3D multicellular spheroids could provide valuable information in a more timely and less expensive manner than directly proceeding from 2D cell culture experiments to animal (murine) models.
To facilitate the discovery of new therapeutics for NET patients, we have developed an in vitro 3D multicellular spheroids model using the human NET cell lines. The NET cells are plated in a non-adhesive agarose-coated 24-well plate and incubated under physiological conditions (5% CO2, 37 &deg;C) with a very slow agitation for 16-24 hr after plating. The cells form multicellular spheroids starting on the 3rd or 4th day. The spheroids become more spherical by the 6th day, at which point the drug treatments are initiated. The efficacy of the drug treatments on the NET spheroids is monitored based on the morphology, shape and size of the spheroids with a phase-contrast light microscope. The size of the spheroids is estimated automatically using a custom-developed MATLAB program based on an active contour algorithm. Further, we demonstrate a simple method to process the HistoGel embedding on these 3D spheroids, allowing the use of standard histological and immunohistochemical techniques. 
This is the first report on generating 3D spheroids using NET cell lines to examine the effect of therapeutic drugs. We have also performed histology on these 3D spheroids, and displayed an example of a single drug's effect on growth and proliferation of the NET spheroids. Our results support that the NET spheroids are valuable for further studies of NET biology and drug development.

We present a simple agarose overlay platform to grow 3D multicellular spheroids using neuroendocrine cancer cell lines. This method provides a very convenient way to examine the effect of therapeutic drugs on the neuroendocrine tumor cells. It could also help us establish human neuroendocrine tumor spheroids for cancer therapy.

인간 Neuroendocrine 종양 치료의 연구를위한 3 차원 모델로 인간 Neuroendocrine 종양 세포 라인

Neuroendocrine tumors (NETs) are rare tumors, with an incidence of two per 100,&#x200A;000 individuals per year, and they account for 0.5% of all human ...

A Murine Model of Stent Implantation in the Carotid Artery for the Study of Restenosis

Despite the considerable progress made in the stent development in the last decades, cardiovascular diseases remain the main cause of death in western countries. Beside the benefits offered by the development of different drug-eluting stents, the coronary revascularization bears also the life-threatening risks of in-stent thrombosis and restenosis. Research on new therapeutic strategies is impaired by the lack of appropriate methods to study stent implantation and restenosis processes. Here, we describe a rapid and accessible procedure of stent implantation in mouse carotid artery, which offers the possibility to study in a convenient way the molecular mechanisms of vessel remodeling and the effects of different drug coatings.

A model of stent implantation in mouse carotid artery is described. Compared to other similar methods, this procedure is very rapid, simple and accessible, offering the possibility to study in a convenient way the vascular wall reaction to different drug-eluting stents and the molecular mechanisms of restenosis.

재 협착의 연구에 대한 경동맥 스텐트 시술의 쥐과 모형

Despite  the considerable progress made in the stent development in the last decades,  cardiovascular diseases remain the main cause of death in western ...

Retinal Detachment Model in Rodents by Subretinal Injection of Sodium Hyaluronate

Subretinal injection of sodium hyaluronate is a widely accepted method of inducing retinal detachment (RD). However, the height and duration of RD or the occurrence of subretinal hemorrhage can affect photoreceptor cell death in the detached retina. Hence, it is advantageous to create reproducible RDs without subretinal hemorrhage for evaluating photoreceptor cell death. We modified a previously reported method to create bullous and persistent RDs in a reproducible location with rare occurrence of subretinal hemorrhage. The critical step of this modified method is the creation of a self-sealing scleral incision, which can prevent leakage of sodium hyaluronate after injection into the subretinal space. To make the self-sealing scleral incision, a scleral tunnel is created, followed by scleral penetration into the choroid with a 30 G needle. Although choroidal hemorrhage may occur during this step, astriction with a surgical spear reduces the rate of choroidal hemorrhage. This method allows a more reproducible and reliable model of photoreceptor death in diseases that involve RD such as rhegmatogenous RD, retinopathy of prematurity, diabetic retinopathy, central serous chorioretinopathy, and age-related macular degeneration (AMD).

Creating experimental retinal detachments with a reproducible and sustained height of detachment, and without subretinal hemorrhage, is important for studying the pathophysiology of photoreceptor cell loss in retinal disease and evaluating potential therapeutic interventions. Here, we report such a method in detail.

나트륨 히알루 론산의 망막 주사 설치류에있는 망막 박리 모델

Subretinal injection of sodium hyaluronate is a widely accepted method of inducing retinal detachment (RD). However, the height and duration of RD or the ...

Implantation of Fibrin Gel on Mouse Lung to Study Lung-specific Angiogenesis

Recent significant advances in stem cell research and bioengineering techniques have made great progress in utilizing biomaterials to regenerate and repair damage in simple tissues in the orthopedic and periodontal fields. However, attempts to regenerate the structures and functions of more complex three-dimensional (3D) organs such as lungs have not been very successful because the biological processes of organ regeneration have not been well explored. It is becoming clear that angiogenesis, the formation of new blood vessels, plays key roles in organ regeneration. Newly formed vasculatures not only deliver oxygen, nutrients and various cell components that are required for organ regeneration but also provide instructive signals to the regenerating local tissues. Therefore, to successfully regenerate lungs in an adult, it is necessary to recapitulate the lung-specific microenvironments in which angiogenesis drives regeneration of local lung tissues. Although conventional in vivo angiogenesis assays, such as subcutaneous implantation of extracellular matrix (ECM)-rich hydrogels (e.g., fibrin or collagen gels or Matrigel - ECM protein mixture secreted by Engelbreth-Holm-Swarm mouse sarcoma cells), are extensively utilized to explore the general mechanisms of angiogenesis, lung-specific angiogenesis has not been well characterized because methods for orthotopic implantation of biomaterials in the lung have not been well established. The goal of this protocol is to introduce a unique method to implant fibrin gel on the lung surface of living adult mouse, allowing for the successful recapitulation of host lung-derived angiogenesis inside the gel. This approach enables researchers to explore the mechanisms by which the lung-specific microenvironment controls angiogenesis and alveolar regeneration in both normal and pathological conditions. Since implanted biomaterials release and supply physical and chemical signals to adjacent lung tissues, implantation of these biomaterials on diseased lung can potentially normalize the adjacent diseased tissues, enabling researchers to develop new therapeutic approaches for various types of lung diseases.

Recapitulation of the organ-specific microenvironment, which stimulates local angiogenesis, is indispensable for successful regeneration of damaged tissues. This report demonstrates a novel method to implant fibrin gels on the lung surface of living mouse in order to explore how the lung-specific microenvironment modulates angiogenesis and alveolar regeneration in adult mouse.

마우스 폐에 섬유소 젤의 주입은 폐 관련 신생 혈관 연구에

Recent significant advances in stem cell research and bioengineering techniques have made great progress in utilizing biomaterials to regenerate and ...

Establishment of a Human Multiple Myeloma Xenograft Model in the Chicken to Study Tumor Growth, Invasion and Angiogenesis

Multiple myeloma (MM), a malignant plasma cell disease, remains incurable and novel drugs are required to improve the prognosis of patients. Due to the lack of the bone microenvironment and auto/paracrine growth factors human MM cells are difficult to cultivate. Therefore, there is an urgent need to establish proper in vitro and in vivo culture systems to study the action of novel therapeutics on human MM cells. Here we present a model to grow human multiple myeloma cells in a complex 3D environment in vitro and in vivo. MM cell lines OPM-2 and RPMI-8226 were transfected to express the transgene GFP and were cultivated in the presence of human mesenchymal cells and collagen type-I matrix as three-dimensional spheroids. In addition, spheroids were grafted on the chorioallantoic membrane (CAM) of chicken embryos and tumor growth was monitored by stereo fluorescence microscopy. Both models allow the study of novel therapeutic drugs in a complex 3D environment and the quantification of the tumor cell mass after homogenization of grafts in a transgene-specific GFP-ELISA. Moreover, angiogenic responses of the host and invasion of tumor cells into the subjacent host tissue can be monitored daily by a stereo microscope and analyzed by immunohistochemical staining against human tumor cells (Ki-67, CD138, Vimentin) or host mural cells covering blood vessels (desmin/ASMA).
In conclusion, the onplant system allows studying MM cell growth and angiogenesis in a complex 3D environment and enables screening for novel therapeutic compounds targeting survival and proliferation of MM cells.

Human multiple myeloma (MM) cells require the supportive microenvironment of mesenchymal cells and extracellular matrix components for survival and proliferation. We established an in vivo chicken embryo model with engrafted human myeloma and mesenchymal cells to study effects of cancer drugs on tumor growth, invasion and angiogenesis.

닭에서 인간의 다발성 골수종 이종 이식 모델의 설립은 종양의 성장, 침략과 혈관 신생을 공부하기

Multiple myeloma (MM), a malignant plasma cell disease, remains incurable and novel drugs are required to improve the prognosis of patients. Due to the ...

A Mouse Model of Orthopedic Surgery to Study Postoperative Cognitive Dysfunction and Tissue Regeneration

Surgery is commonly used to improve and maintain quality of life. Unfortunately, in vulnerable patients such as the elderly, complications may occur and significantly diminish the outcome. Indeed, after routine orthopedic surgery to repair a fracture, as many as 50% of elderly patients suffer from neurologic complications like delirium. Also, the capacity to heal and regenerate tissue after surgery decreases with age, and can impact the quality of fracture repair and even osseous integration of implants. Thus, a better understanding of mechanisms that drive these age-dependent changes could provide strategic targets to minimize risk for such complications and optimize outcomes. Here, we introduce a clinically relevant mouse model of tibial fracture. The postoperative changes in these mice mimic some of the cognitive impairments commonly observed after routine orthopedic surgery in humans. Briefly, an incision is performed in the right hind limb under strictly aseptic conditions. Muscles are disassociated, and a 0.38-mm stainless steel pin is inserted into the upper crest of the tibia, inside the intramedullary canal. Osteotomy is then performed, and the wound is stapled. We have used this model to investigate the effects of surgical trauma on postoperative neuroinflammation and behavioral changes. By applying this fracture model in combination with parabiosis, a surgical model in which 2 mice are anastomosed, we have studied cells and secreted factors that systemically rejuvenate organ function and tissue regeneration after injury. By following our step-by-step protocol, these models can be reproduced with high fidelity, and can be adapted to interrogate many biologic pathways that are altered by surgical trauma.

This protocol describes a mouse model of orthopedic surgery that has been used to study mechanisms of postoperative neuroinflammation and behavioral changes, and when combined with parabiosis, to study tissue regeneration during aging.

정형 외과 수술 후 인지 기능 장애 및 조직 재생 연구의 마우스 모델

Surgery is commonly used to improve and maintain quality of life. Unfortunately, in vulnerable patients such as the elderly, complications may occur and ...

Isometric Contractility Measurement of the Mouse Mesenteric Artery Using Wire Myography

The wire myograph technique is used to assess the contractility of vascular smooth muscles in response to depolarization, GPCR agonists/inhibitors and drugs. It is widely used in many studies on the physiological functions of vascular smooth muscle, the pathogenesis of vascular diseases such as hypertension, and the development of smooth muscle relaxant drugs. The mouse is a widely used model animal with a large pool of disease models and genetically modified strains. We introduced this method to measure the isometric contraction of mouse mesenteric artery in detail. A 1.4-mm segment of mouse mesenteric resistance artery was isolated and mounted on a myograph chamber by passing two steel wires through its lumen. After equilibration and normalization steps, the vessel segment was potentiated by a high-K+ solution twice prior to the contraction assay. As an example of the application of this method in drug development, we measured the relaxant effect of a novel natural substance, neoliensinine, isolated from a Chinese herb, embryos of the lotus seed (Nelumbo nucifera Gaertn.) on mouse mesenteric arteries. The vessel segments mounted on the myograph chamber were stimulated with a high-K+ solution. When the force tension reached a stable sustained phase, cumulative doses of neoliensinine were added to the chamber. We found that neoliensinine had a dose-dependent relaxant effect on smooth muscle contraction, thus suggesting that it bears potential activity against hypertension. In addition, as the vessel segment can survive at least 4 hours after mounting and maintain contractility induced by the high-K+ solution for many times, we suggest that the wire myograph system may be used for the time-consuming process of drug screening.

The wire myograph technique is used to investigate vascular smooth muscle functions and screen new drugs. We report a detailed protocol for measuring the isometric contractility of the mouse mesenteric artery and for screening new relaxants of vascular smooth muscle.

Myography 와이어를 사용 하 여 마우스 Mesenteric 동맥의 isometric 수축 측정

The wire myograph technique is used to assess the contractility of vascular smooth muscles in response to depolarization, GPCR agonists/inhibitors and ...

Corneal Epithelial Abrasion with Ocular Burr As a Model for Cornea Wound Healing

The murine cornea provides an excellent model to study wound healing. The cornea is the outermost layer of the eye, and thus is the first defense to injury. In fact, the most common type of eye injury found in clinic is a corneal abrasion. Here, we utilize an ocular burr to induce an abrasion resulting in removal of the corneal epithelium in vivo on anesthetized mice. This method allows for targeted and reproducible epithelial disruption, leaving other areas intact. In addition, we describe the visualization of the abraded epithelium with fluorescein staining and provide concrete advice on how to visualize the abraded cornea. Then, we follow the timeline of wound healing 0, 18, and 72 h after abrasion, until the wound is re-epithelialized. The epithelial abrasion model of corneal injury is ideal for studies on epithelial cell proliferation, migration and re-epithelialization of the corneal layers. However, this method is not optimal to study stromal activation during wound healing, because the ocular burr does not penetrate to the stromal cell layers. This method is also suitable for clinical applications, for example, pre-clinical test of drug effectiveness.

This protocol describes a method to inflict an abrasion to the ocular surface of the mouse, and to follow the wound healing process thereafter. The protocol takes advantage of an ocular burr to partially remove the surface epithelium of the eye in anaesthetized mice.

각 막에 대 한 모델로 눈 버와 각 막 상피 마모 상처 치유

The murine cornea provides an excellent model to study wound healing. The cornea is the outermost layer of the eye, and thus is the first defense to ...

Assessing Therapeutic Angiogenesis in a Murine Model of Hindlimb Ischemia

Critical limb ischemia (CLI) is a serious condition that entails a high risk of lower limb amputation. Despite revascularization being the gold-standard therapy, a considerable number of CLI patients are not suited for either surgical or endovascular revascularization. Angiogenic therapies are emerging as an option for these patients but are currently still under investigation. Before application in humans, those therapies must be tested in animal models and its mechanisms must be clearly understood. An animal model of hindlimb ischemia (HLI) has been developed by the ligation and excision of the distal external iliac and femoral arteries and veins in mice. A comprehensive panel of tests was assembled to assess the effects of ischemia and putative angiogenic therapies at functional, histologic and molecular levels. Laser Doppler was used for the flow measurement and functional assessment of perfusion. Tissue response was evaluated by the analysis of capillary density after staining with the anti-CD31 antibody on histological sections of gastrocnemius muscle and by measurement of collateral vessel density after diaphonization. Expression of angiogenic genes was quantified by RT-PCR targeting selected angiogenic factors exclusively in endothelial cells (ECs) after laser capture microdissection from mice gastrocnemius muscles. These methods were sensitive in identifying differences between ischemic and non-ischemic limbs and between treated and non-treated limbs. This protocol provides a reproducible model of CLI and a framework for testing angiogenic therapies.

Here, a critical hindlimb ischemia experimental model is presented followed by a battery of functional, histologic and molecular tests&#160;to assess the effectiveness of angiogenic therapies.&#8203;

힌들보 리 허 혈의 뮤린 모델에서 치료 혈관 신생 평가

Critical limb ischemia (CLI) is a serious condition that entails a high risk of lower limb amputation. Despite revascularization being the gold-standard ...