Name: implantation of electrospun vascular grafts with optimized structure in a rat model
Uploaded: 2018-06-27T13:00:00
Description: Watch this Scientific Journal Video about Implantation of Electrospun Vascular Grafts with Optimized Structure in a Rat Model at JoVE.com

这项工作得到了自然科学基金项目 (81522023、81530059、91639113、81772000、81371699和 81401534) 的财政支持。

实验动物的使用由南开大学动物实验伦理委员会批准, 并按照《实验室动物护理和使用指南》进行。
1. 静电纺丝 PCL 移植物的制备
注: 本文采用静电纺丝技术制备血管移植。
<ol><li>制备 25 wt% 和 10 wt% 的 pcl 溶液, 分别在甲醇和氯仿混合物中溶解 pcl (1:5 体积比), 室温 (RT) 为12小时。</li>
	<li>将 PCL 溶液装入10毫升的玻璃注射器中。</li>
	<li>把注射器放在21克的?...

<ol>
	<li>Coombs, K. E., Leonard, A. T., Rush, M. N., Santistevan, D. A., Hedberg-Dirk, E. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isolated+effect+of+material+stiffness+on+valvular+interstitial+cell+differentiation.">Isolated effect of material stiffness on valvular interstitial cell differentiation.</a> J Biomed Mater Res A. 105 (1), 51-61 (2017).</li><li>Zhang, 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=A+sandwich+tubular+scaffold+derived+from+chitosan+for+blood+vessel+tissue+engineering.">A sandwich tubular scaffold derived from chitosan for blood vessel tissue engineering.</a> J Biomed Mater Res A. 77 (2), 277-284 (2006).</li><li>Thottappillil, N., Nair, P. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Scaffolds+in+vascular+regeneration:+current+status.">Scaffolds in vascular regeneration: current status.</a> Vasc Health Risk Manag. 11, 79-91 (2015).</li><li>Pektok, E., 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=Degradation+and+healing+characteristics+of+small-diameter+poly+(e-caprolactone)+vascular+grafts+in+the+rat+systemic+arterial+circulation.">Degradation and healing characteristics of small-diameter poly (e-caprolactone) vascular grafts in the rat systemic arterial circulation.</a> Circulation. 118 (24), 2563-2570 (2008).</li><li>Innocente, F., 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=Paclitaxel-eluting+biodegradable+synthetic+vascular+prostheses:+a+step+towards+reduction+of+neointima+formation?.">Paclitaxel-eluting biodegradable synthetic vascular prostheses: a step towards reduction of neointima formation?.</a> Circulation. 120 (11 Suppl), S37-S45 (2009).</li><li>de Valence, 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=Advantages+of+bilayered+vascular+grafts+for+surgical+applicability+and+tissue+regeneration.">Advantages of bilayered vascular grafts for surgical applicability and tissue regeneration.</a> Acta Biomater. 8 (11), 3914-3920 (2012).</li><li>Assmann, 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=Acceleration+of+autologous+in+vivo+recellularization+of+decellularized+aortic+conduits+by+fibronectin+surface+coating.">Acceleration of autologous in vivo recellularization of decellularized aortic conduits by fibronectin surface coating.</a> Biomaterials. 34 (25), 6015-6026 (2013).</li><li>Hasan, 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=Electrospun+scaffolds+for+tissue+engineering+of+vascular+grafts.">Electrospun scaffolds for tissue engineering of vascular grafts.</a> Acta Biomater. 10 (1), 11-25 (2014).</li><li>Baker, B. 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=The+potential+to+improve+cell+infiltration+in+composite+fiber-aligned+electrospun+scaffolds+by+the+selective+removal+of+sacrificial+fibers.">The potential to improve cell infiltration in composite fiber-aligned electrospun scaffolds by the selective removal of sacrificial fibers.</a> Biomaterials. 29 (15), 2348-2358 (2008).</li><li>Wang, K., 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=Creation+of+macropores+in+electrospun+silk+fibroin+scaffolds+using+sacrificial+PEO-microparticles+to+enhance+cellular+infiltration.">Creation of macropores in electrospun silk fibroin scaffolds using sacrificial PEO-microparticles to enhance cellular infiltration.</a> Journal of Biomedical Materials Research Part A. 101 (12), 3474-3481 (2013).</li><li>Lee, B. L. P., 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=Femtosecond+laser+ablation+enhances+cell+infiltration+into+three-dimensional+electrospun+scaffolds.">Femtosecond laser ablation enhances cell infiltration into three-dimensional electrospun scaffolds.</a> Acta Biomaterialia. 8 (7), 2648-2658 (2012).</li><li>Rnjak-Kovacina, J., Weiss, A. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Increasing+the+pore+size+of+electrospun+scaffolds.">Increasing the pore size of electrospun scaffolds.</a> Tissue Eng Part B Rev. 17 (5), 365-372 (2011).</li><li>Zhong, S., Zhang, Y., Lim, C. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fabrication+of+large+pores+in+electrospun+nanofibrous+scaffolds+for+cellular+infiltration:+a+review.">Fabrication of large pores in electrospun nanofibrous scaffolds for cellular infiltration: a review.</a> Tissue Eng Part B Rev. 18 (2), 77-87 (2012).</li><li>Pham, Q. P., Sharma, U., Mikos, A. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Electrospun+poly(epsilon-caprolactone)+microfiber+and+multilayer+nanofiber/microfiber+scaffolds:+characterization+of+scaffolds+and+measurement+of+cellular+infiltration.">Electrospun poly(epsilon-caprolactone) microfiber and multilayer nanofiber/microfiber scaffolds: characterization of scaffolds and measurement of cellular infiltration.</a> Biomacromolecules. 7 (10), 2796-2805 (2006).</li><li>Rnjak-Kovacina, 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=Tailoring+the+porosity+and+pore+size+of+electrospun+synthetic+human+elastin+scaffolds+for+dermal+tissue+engineering.">Tailoring the porosity and pore size of electrospun synthetic human elastin scaffolds for dermal tissue engineering.</a> Biomaterials. 32 (28), 6729-6736 (2011).</li><li>Wang, Z., 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=The+effect+of+thick+fibers+and+large+pores+of+electrospun+poly(epsilon-caprolactone)+vascular+grafts+on+macrophage+polarization+and+arterial+regeneration.">The effect of thick fibers and large pores of electrospun poly(epsilon-caprolactone) vascular grafts on macrophage polarization and arterial regeneration.</a> Biomaterials. 35 (22), 5700-5710 (2014).</li><li>Hutcheson, J. 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=Genesis+and+growth+of+extracellular-vesicle-derived+microcalcification+in+atherosclerotic+plaques.">Genesis and growth of extracellular-vesicle-derived microcalcification in atherosclerotic plaques.</a> Nat Mater. 15 (3), 335-343 (2016).</li><li>Tara, 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=Well-organized+neointima+of+large-pore+poly(L-lactic+acid)+vascular+graft+coated+with+poly(L-lactic-co-epsilon-caprolactone)+prevents+calcific+deposition+compared+to+small-pore+electrospun+poly(L-lactic+acid)+graft+in+a+mouse+aortic+implantation+model.">Well-organized neointima of large-pore poly(L-lactic acid) vascular graft coated with poly(L-lactic-co-epsilon-caprolactone) prevents calcific deposition compared to small-pore electrospun poly(L-lactic acid) graft in a mouse aortic implantation model.</a> Atherosclerosis. 237 (2), 684-691 (2014).</li></ol>

细胞浸润对16体内血管移植的再生和重塑至关重要。有限细胞浸润通常与移植的相对较小的毛孔有关, 阻碍细胞向移植壁迁移。为了解决这一困难, 我们开发了一种改进的方法来制备静电纺丝 PCL 血管移植的大孔结构。详细地说, 孔隙大小随纤维厚度的增加而增大, 其加工参数可以很容易地控制。结果表明,在体外植入后, 宿主细胞很容易渗入到大孔移植的壁内, 细胞构?...

合成高分子的血管移植广泛应用于心血管疾病 (心血管病) 的临床治疗。不幸的是, 在小直径血管移植 (D < 6 毫米) 的情况下, 没有成功的产品, 由于低通畅触发的血液流速降低, 这往往导致血栓形成, 内膜增生, 和其他并发症1。
组织工程提供了一个替代策略, 以实现长期通畅和动态平衡的基础上的支架引导血管再生和重建。详细来说, 血管移植作为一个三维模板, 可以在血管组织再生过程中提供机械支持和结构指导, 并影响细胞功能, 包括细胞黏附、迁移、增殖和分泌细胞外基质2。到目前为止, 各种合成聚合物已被评价为应用于血管组织工程。在这些聚合物中, 聚 (己内酯) (PCL) 由于良好的细胞相容性和缓慢的降解, 从几个月到两年不等, 已被深入研究。用静电纺丝处理的大鼠主动脉模型4、5、6、PCL 血管移植表现出优良的结构完整性和通畅性, 并不断增加细胞侵袭和新生血管移植壁长达6月。然而, 不良组织重塑, 包括细胞的回归和毛细血管和钙化, 也被观察到更长的 timepoints, 长达18月。
Cellularization 血管移植是决定组织再生和重塑7的关键因素。静电纺丝作为一种多功能技术, 已广泛应用于纳米纤维结构8的血管移植的制备。不幸的是, 相对较小的孔隙结构往往导致细胞浸润不足的静电纺丝血管移植, 这限制了随后的组织再生。为了解决这一问题, 尝试了各种技术来提高孔径和整体孔隙率, 包括盐/聚合物浸出9,10, 集热器的修改, 激光辐照后处理11等。事实上, 静电纺丝的结构 (包括纤维直径、孔隙大小和孔隙度) 与加工条件12、13密切相关。在静电纺丝过程中, 通过改变聚合物溶液的浓度、流量、电压等参数, 可以很容易地控制纤维的直径. 14,15, 因此, 孔隙大小和孔隙度得到了相应的增强。
我们最近报告了一个改良的 PCL 静电纺丝移植与大孔结构 (纤维直径 5-7 µm 和毛孔 30-40 µm)。在活体移植中, 取代大鼠腹主动脉显示出高的通畅率, 以及良好的内皮化和平滑肌再生3月后手术16。更重要的是, 即使在植入一年后, 也不会有钙化和细胞回归等不良组织重塑。

<table>
	<tbody>
		<tr>
			<td>Poly(&#949;-caprolactone) (PCL) pellets (Mn=80,000)</td>
			<td>Sigma</td>
			<td>704067</td>
			<td></td>
		</tr>
		<tr>
			<td>Methanol</td>
			<td>Tianjin Chemical Reagent Company</td>
			<td>1060</td>
			<td></td>
		</tr>
		<tr>
			<td>Alcohol</td>
			<td>Tianjin Chemical Reagent Company</td>
			<td>1083</td>
			<td></td>
		</tr>
		<tr>
			<td>Chloroform</td>
			<td>Tianjin Chemical Reagent Company</td>
			<td>A1007</td>
			<td></td>
		</tr>
		<tr>
			<td>Sucrose</td>
			<td>Tianjin Fengchuan Company</td>
			<td>2296</td>
			<td></td>
		</tr>
		<tr>
			<td>Triton X-100</td>
			<td>Alfa Aesar</td>
			<td>A16046</td>
			<td></td>
		</tr>
		<tr>
			<td>Sprague Dawley rats</td>
			<td>Laboratory Animal Center of the Academy of Military Medical Sciences</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Normal saline</td>
			<td>Hebei Tiancheng Pharmaceutical company</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Chloral hydrate</td>
			<td>Tianjin Ruijinte chemical company</td>
			<td>2223</td>
			<td></td>
		</tr>
		<tr>
			<td>Heparin sodium Injection</td>
			<td>Tianjin Biochem Pharmaceutical company</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Gentamycin Sulfate Injection</td>
			<td>Jiangsu Lianshui Pharmaceutical company</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Mouse anti-&#945;-SMA primary antibody</td>
			<td>Abcam</td>
			<td>ab7817</td>
			<td></td>
		</tr>
		<tr>
			<td>Mouse anti-smooth MYH primary antibody</td>
			<td>Abcam</td>
			<td>ab683</td>
			<td></td>
		</tr>
		<tr>
			<td>Rabbit polyclonal anti-rat elastin antibody</td>
			<td>Abcam</td>
			<td>ab23748</td>
			<td></td>
		</tr>
		<tr>
			<td>Rabbit anti-von Willebrand factor primary antibody</td>
			<td>Abcam</td>
			<td>ab6994</td>
			<td></td>
		</tr>
		<tr>
			<td>Goat anti-mouse IgG (Alexa Fluor 488)</td>
			<td>Invitrogen</td>
			<td>ab150117</td>
			<td></td>
		</tr>
		<tr>
			<td>Goat anti-rabbit IgG (Alexa Fluor 488)</td>
			<td>Invitrogen</td>
			<td>ab150077</td>
			<td></td>
		</tr>
		<tr>
			<td>5% normal goat serum</td>
			<td>Zhongshan Golden bridge</td>
			<td>ZLI9022</td>
			<td></td>
		</tr>
		<tr>
			<td>Hematoxylin and eosin (H&#38;E)</td>
			<td>Beijing leagene biotech</td>
			<td>DH0006</td>
			<td></td>
		</tr>
		<tr>
			<td>Masson&#39;s trichrome</td>
			<td>Beijing leagene biotech</td>
			<td>DC0032</td>
			<td></td>
		</tr>
		<tr>
			<td>Verhoeff-van Gieson (VVG)</td>
			<td>Beijing leagene biotech</td>
			<td>DC0059</td>
			<td></td>
		</tr>
		<tr>
			<td>Von Kossa</td>
			<td>Beijing leagene biotech</td>
			<td>DS0003</td>
			<td></td>
		</tr>
		<tr>
			<td>Surgical sutures needles with thread,3-0 silk</td>
			<td>Shanghai Jinhuan medical supplies company</td>
			<td>G3002b</td>
			<td></td>
		</tr>
		<tr>
			<td>Surgical sutures needles with thread,9-0 silk</td>
			<td>Shanghai Jinhuan medical supplies company</td>
			<td>H901</td>
			<td></td>
		</tr>
	</tbody>
</table>

implantation of electrospun vascular grafts with optimized structure in a rat model

在这里, 我们提出了一个制备大孔 PCL 血管移植的协议, 并描述了一个模型的应用腹主动脉替代模式的评估协议。静电纺丝血管移植通常具有相对较小的孔隙, 限制细胞浸润到移植物中, 阻碍新动脉的再生和重塑。本研究采用改良的工艺制备了较厚纤维 (5-6 µm) 和较大孔隙 (~ 30 µm) 的 PCL 血管移植。采用大鼠腹主动脉模型植入法对移植物的远期表现进行评价。超声分析显示, 即使植入12月后, 移植物仍未发生动脉瘤或狭窄。大孔结构改善细胞肉芽, 从而促进组织再生3月。更重要的是, 没有出现不良重塑的迹象, 例如12月后移植壁内的钙化。因此, 经改良大孔处理的静电纺丝 PCL 血管移植可作为长期植入的动脉替代物。

对 PCL 移植术后3月和12月说明, 用标准组织学技术对苏木精和伊红 (H & E)、马尾松三色、Verhoeff Gieson (VVG)、冯科萨和α SMA 的免疫荧光染色进行分析,MYH, vWF 和弹力蛋白。组织学图像采用直立显微镜, 用ﬂuorescence 显微镜拍摄免疫荧光图像。
所有数据均以平均值表示。用双尾配对学生的t检验来比较差异。p < 0.05 的值被?...

Watch this Scientific Journal Video about Implantation of Electrospun Vascular Grafts with Optimized Structure in a Rat Model at JoVE.com

Implantation of Electrospun Vascular Grafts with Optimized Structure in a Rat Model

优化结构静电纺丝血管移植在大鼠模型中的植入

在此, 我们提出了一种改进的静电纺丝方法, 以制造粗纤维和大孔隙的 PCL 血管移植, 并描述了一个协议, 以评估在体内的性能在大鼠腹主动脉置换模型。

Here, we present a protocol to fabricate macroporous PCL vascular graft and describe an evaluation protocol by using a rat model of abdominal aorta ...

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Cell migration is an important process that influences many aspects of health, such as wound healing and cancer, and it is, therefore, crucial for ...

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Studying the structure and the dynamics of kinetochores and centromeres is important in understanding chromosomal instability (CIN) and cancer ...

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Human implantation, the apposition and adhesion to the uterine surface epithelia and subsequent invasion of the blastocyst into the maternal decidua, is a ...