Name: human saphenous vein endothelial cell isolation and exposure to controlled levels of shear stress and stretch
Uploaded: 2023-04-21T14:35:00
Description: Watch this Scientific Journal Video about Human Saphenous Vein Endothelial Cell Isolation and Exposure to Controlled Levels of Shear Stress and Stretch at JoVE.com

JEK is supported by grants from Funda&#231;&#227;o de Amparo &#224; Pesquisa do Estado de S&#227;o Paulo [FAPESP-INCT-20214/50889-7 and 2013/17368-0] and Conselho Nacional de Desenvolvimento Cient&#237;fico e Tecnol&#243;gico-CNPq (INCT-465586/2014-7 and 309179/2013-0). AAM is supported by grants from Funda&#231;&#227;o de Amparo &#224; Pesquisa do Estado de S&#227;o Paulo (FAPESP 2015/11139-5) and Conselho Nacional de Desenvolvimento Cient&#237;fico e Tecnol&#243;gico-CNPq (Universal - 407911/2021-9).

Unused segments of saphenous veins were obtained from patients undergoing aortocoronary bypass surgery at the Heart Institute (InCor), University of S&#227;o Paulo Medical School. All individuals gave informed consent to participate in the study, which was reviewed and approved by the local ethics committee.
1. Isolation, culture, and characterization of primary human saphenous vein endothelial cells (hSVECs)
<ol>
	<li>Preparation
	<ol>
		<li>Autoclave a pair of straight or ...

<ol>
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The saphenous vein segment should have be least 2 cm to successfully isolate hSVECs. Small segments are difficult to handle and tie the ends of the vessel to maintain the collagenase solution to isolate the cells. The reduced luminal surface area does not yield sufficient cells to expand the culture. To minimize the risk of contamination with non-ECs, the manipulation of the saphenous vein segment needs to be very gentle during the entire procedure. It is important to be careful when introducing the pipette tips into the...

Endothelial cell (EC) dysfunction is a key player in saphenous vein graft failure1,2,3,4. The sustained increase of shear stress and cyclic stretch induces the proinflammatory phenotype of human saphenous vein endothelial cells (hSVECs)3,4,5,6. The underlying molecular pathways are still not fully understood, and standardized protocols for in vitro studies may leverage the efforts for novel insights in the area. Here, we describe a simple protocol to isolate, characterize, and expand hSVECs and how to expose them to variable levels of shear stress and cyclic stretch, mimicking the venous and arterial hemodynamic conditions.
hSVECs are isolated by collagenase incubation and can be used up to passage 8. This protocol requires less manipulation of the vessel compared with the other available protocols7, which reduces contamination with smooth muscle cells and fibroblasts. On the other hand, it requires a larger vessel segment of at least 2 cm to have efficient EC extraction. In the literature, it has been reported that ECs from large vessels can also be obtained by mechanical removal7,8. Although effective, the physical approach has the disadvantages of low EC yield and higher fibroblast contamination. To increase the purity, extra steps are needed using magnetic beads or cell sorting, increasing the cost of the protocol due to the acquisition of beads and antibodies7,8. The enzymatic method has faster and better outcomes regarding EC purity and viability7,8.
The most frequently used ECs to study endothelial dysfunction are human umbilical vein endothelial cells (HUVECs). It is known that the EC phenotype changes in different vascular beds, and it is essential to develop methods that represent the vessel under investigation9,10. In this respect, the establishment of a protocol to isolate a hSVEC and culture it under mechanical stress is a valuable tool to understand the contribution of hSVEC dysfunction in vein graft disease.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>0.25% Trypsin-0.02% EDTA solution</td>
			<td>Gibco</td>
			<td>25200072</td>
			<td></td>
		</tr>
		<tr>
			<td>15 &#181; slide I 0.4 Luer&#160;</td>
			<td>Ibidi</td>
			<td>80176</td>
			<td></td>
		</tr>
		<tr>
			<td>4&#39;,6-Diamidino-2-Phenylindole, Dilactate (DAPI)</td>
			<td>Thermo Fisher Scientific</td>
			<td>D3571</td>
			<td></td>
		</tr>
		<tr>
			<td>6-wells equibiaxial loading station of 25 mm&#160;</td>
			<td>Flexcell International Corporation</td>
			<td>LS-3000B25.VJW</td>
			<td></td>
		</tr>
		<tr>
			<td>8-well chamber slide with removable well</td>
			<td>Thermo Fisher Scientific</td>
			<td>154453</td>
			<td></td>
		</tr>
		<tr>
			<td>Acetic Acid (Glacial)</td>
			<td>Millipore</td>
			<td>100063</td>
			<td></td>
		</tr>
		<tr>
			<td>Acrylic sheet 1 cm thick</td>
			<td>Plexiglass</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-CD31 antibody</td>
			<td>Abcam</td>
			<td>ab24590</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-CD31, FITC antibody</td>
			<td>Thermo Fisher Scientific</td>
			<td>MHCD3101</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-VE-cadherin antibody</td>
			<td>Cell Signaling</td>
			<td>2500</td>
			<td></td>
		</tr>
		<tr>
			<td>Bioflex plates collagen I</td>
			<td>Flexcell International Corporation</td>
			<td>BF3001C</td>
			<td></td>
		</tr>
		<tr>
			<td>Bovine serum albumin solution</td>
			<td>Sigma-Aldrich</td>
			<td>A8412</td>
			<td></td>
		</tr>
		<tr>
			<td>Cotton suture EP 3.5 15 x 45 cm</td>
			<td>Brasuture</td>
			<td>AP524</td>
			<td></td>
		</tr>
		<tr>
			<td>Cyclophilin forward primer</td>
			<td>Thermo Fisher Scientific</td>
			<td>Custom designed</td>
			<td></td>
		</tr>
		<tr>
			<td>Cyclophilin reverse primer</td>
			<td>Thermo Fisher Scientific</td>
			<td>Custom designed</td>
			<td></td>
		</tr>
		<tr>
			<td>Dimethyl sulfoxide (DMSO)</td>
			<td>Sigma-Aldrich</td>
			<td>D4540</td>
			<td></td>
		</tr>
		<tr>
			<td>EBM-2 basal medium</td>
			<td>Lonza</td>
			<td>CC3156</td>
			<td></td>
		</tr>
		<tr>
			<td>EGM-2 SingleQuots supplements</td>
			<td>Lonza</td>
			<td>CC4176</td>
			<td></td>
		</tr>
		<tr>
			<td>Fetal bovine serum (FBS)</td>
			<td>Thermo Fisher Scientific</td>
			<td>2657-029</td>
			<td></td>
		</tr>
		<tr>
			<td>Flexcell FX-5000 tension system</td>
			<td>Flexcell International Corporation</td>
			<td>FX-5000T</td>
			<td></td>
		</tr>
		<tr>
			<td>Fluoromount aqueous mounting medium</td>
			<td>Sigma-Aldrich</td>
			<td>F4680</td>
			<td></td>
		</tr>
		<tr>
			<td>Gelatin from porcine skin</td>
			<td>Sigma-Aldrich</td>
			<td>G2500</td>
			<td></td>
		</tr>
		<tr>
			<td>Glycerol</td>
			<td>Sigma-Aldrich</td>
			<td>G5516</td>
			<td></td>
		</tr>
		<tr>
			<td>Goat anti-Mouse IgG Alexa Fluor 488</td>
			<td>Thermo Fisher Scientific</td>
			<td>A11001</td>
			<td></td>
		</tr>
		<tr>
			<td>Goat anti-Rabbit IgG Alexa Fluor 488</td>
			<td>Thermo Fisher Scientific</td>
			<td>A11008</td>
			<td></td>
		</tr>
		<tr>
			<td>Heparin sodium from porcine intestinal mucosa 5000 IU/mL</td>
			<td>Blau Farmac&#234;utica</td>
			<td>SKU 68027</td>
			<td></td>
		</tr>
		<tr>
			<td>Ibidi pump system (Pump + Fluidic Unit)</td>
			<td>Ibidi</td>
			<td>10902</td>
			<td></td>
		</tr>
		<tr>
			<td>KLF2 forward primer</td>
			<td>Thermo Fisher Scientific</td>
			<td>Custom designed</td>
			<td></td>
		</tr>
		<tr>
			<td>KLF2 reverse primer</td>
			<td>Thermo Fisher Scientific</td>
			<td>Custom designed</td>
			<td></td>
		</tr>
		<tr>
			<td>KLF4 forward primer</td>
			<td>Thermo Fisher Scientific</td>
			<td>Custom designed</td>
			<td></td>
		</tr>
		<tr>
			<td>KLF4 reverse primer</td>
			<td>Thermo Fisher Scientific</td>
			<td>Custom designed</td>
			<td></td>
		</tr>
		<tr>
			<td>NOA 280 nitric oxide analyzer</td>
			<td>Sievers Instruments</td>
			<td>NOA-280i-1</td>
			<td></td>
		</tr>
		<tr>
			<td>NOS3 forward primer</td>
			<td>Thermo Fisher Scientific</td>
			<td>Custom designed</td>
			<td></td>
		</tr>
		<tr>
			<td>NOS3 reverse primer</td>
			<td>Thermo Fisher Scientific</td>
			<td>Custom designed</td>
			<td></td>
		</tr>
		<tr>
			<td>Paraformaldehyde (PFA)</td>
			<td>Sigma-Aldrich</td>
			<td>158127</td>
			<td></td>
		</tr>
		<tr>
			<td>Perfusion set 15 cm, ID 1.6 mm, red, 10 mL reservoirs</td>
			<td>Ibidi</td>
			<td>10962</td>
			<td></td>
		</tr>
		<tr>
			<td>Phalloidin - Alexa Fluor 488</td>
			<td>Thermo Fisher Scientific</td>
			<td>A12379</td>
			<td></td>
		</tr>
		<tr>
			<td>Phalloidin - Alexa Fluor 568</td>
			<td>Thermo Fisher Scientific</td>
			<td>A12380</td>
			<td></td>
		</tr>
		<tr>
			<td>Phosphate buffered saline (PBS), pH 7.4</td>
			<td>Thermo Fisher Scientific</td>
			<td>10010031</td>
			<td></td>
		</tr>
		<tr>
			<td>Potassium Iodide</td>
			<td>Sigma-Aldrich</td>
			<td>221945</td>
			<td></td>
		</tr>
		<tr>
			<td>QuanTitec SYBR green PCR kit</td>
			<td>Qiagen</td>
			<td>204143</td>
			<td></td>
		</tr>
		<tr>
			<td>QuantStudio 12K flex platform&#160;</td>
			<td>Applied Biosystems</td>
			<td>4471087</td>
			<td></td>
		</tr>
		<tr>
			<td>RNeasy micro kit&#160;</td>
			<td>Quiagen</td>
			<td>74004</td>
			<td></td>
		</tr>
		<tr>
			<td>Slide glass (24 mm x 60 mm)</td>
			<td>Knittel Glass</td>
			<td>VD12460Y1D.01</td>
			<td></td>
		</tr>
		<tr>
			<td>Sodium nitrite</td>
			<td>Sigma-Aldrich</td>
			<td>31443</td>
			<td></td>
		</tr>
		<tr>
			<td>SuperScript IV first-strand synthesis system</td>
			<td>Thermo Fisher Scientific</td>
			<td>18091200</td>
			<td></td>
		</tr>
		<tr>
			<td>Triton X-100</td>
			<td>Sigma-Aldrich</td>
			<td>T8787</td>
			<td></td>
		</tr>
		<tr>
			<td>Trypan blue stain 0.4%</td>
			<td>Gibco</td>
			<td>15250-061</td>
			<td></td>
		</tr>
		<tr>
			<td>Type II collagenase from Clostridium histolyticum</td>
			<td>Sigma-Aldrich</td>
			<td>C6885</td>
			<td></td>
		</tr>
	</tbody>
</table>

human saphenous vein endothelial cell isolation and exposure to controlled levels of shear stress and stretch

Coronary artery bypass graft (CABG) surgery is a procedure to revascularize ischemic myocardium. Saphenous vein remains used as a CABG conduit despite the reduced long-term patency compared to arterial conduits. The abrupt increase of hemodynamic stress associated with the graft arterialization results in vascular damage, especially the endothelium, that may influence the low patency of the saphenous vein graft (SVG). Here, we describe the isolation, characterization, and expansion of human saphenous vein endothelial cells (hSVECs). Cells isolated by collagenase digestion display the typical cobblestone morphology and express endothelial cell markers CD31 and VE-cadherin. To assess the mechanical stress influence, protocols were used in this study to investigate the two main physical stimuli, shear stress and stretch, on arterialized SVGs. hSVECs are cultured in a parallel plate flow chamber to produce shear stress, showing alignment in the direction of the flow and increased expression of KLF2, KLF4, and NOS3. hSVECs can also be cultured in a silicon membrane that allows controlled cellular stretch mimicking venous (low) and arterial (high) stretch. Endothelial cells' F-actin pattern and nitric oxide (NO) secretion are modulated accordingly by the arterial stretch. In summary, we present a detailed method to isolate hSVECs to study the influence of hemodynamic mechanical stress on an endothelial phenotype.

Typically, adhered ECs can be observed 3-4 days after extraction. hSVECs initially form clusters of cells and display a typical &#34;cobblestone&#34; morphology (Figure 1B). They express the EC markers CD31 (Figure 1C,D) and VE-cadherin (Figure 1D). hSVECs can be easily propagated on a non-coated treated cell culture dish, and they retain the endothelial phenotype in culture up to eight passages.
<p class="jove_...

Watch this Scientific Journal Video about Human Saphenous Vein Endothelial Cell Isolation and Exposure to Controlled Levels of Shear Stress and Stretch at JoVE.com

Human Saphenous Vein Endothelial Cell Isolation and Exposure to Controlled Levels of Shear Stress and Stretch

We describe a protocol to isolate and culture human saphenous vein endothelial cells (hSVECs). We also provide detailed methods to produce shear stress and stretch to study mechanical stress in hSVECs.

Coronary artery bypass graft (CABG) surgery is a procedure to revascularize ischemic myocardium. Saphenous vein remains used as a CABG conduit despite the ...

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