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Yu M, Marquez-Curtis LA, Elliott JAW. Cryopreservation-induced delayed injury and cell-type-specific responses during the cryopreservation of endothelial cell monolayers. Cryobiology 2024; 115:104857. [PMID: 38350589 DOI: 10.1016/j.cryobiol.2024.104857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 01/26/2024] [Accepted: 02/01/2024] [Indexed: 02/15/2024]
Abstract
The cryopreservation of endothelial cell monolayers is an important step that bridges the cryopreservation of cells in suspension to that of tissues. Previous studies have identified clear distinctions in freezing mechanisms between cells in suspension and in monolayers, as well as developed novel protocols for monolayer cryopreservation. Recently, our group has shown that human umbilical vein endothelial cell (HUVEC) and porcine corneal endothelial cell (PCEC) monolayers grown on Rinzl plastic substrate can be cryopreserved in 5% dimethyl sulfoxide, 6% hydroxyethyl starch, and 2% chondroitin sulfate, following a slow-cooling protocol (-1 °C/min) with rapid plunge into liquid nitrogen from -40 °C. However, membrane integrity assessments were done immediately post thaw, which may result in an overestimation of cell viability due to possible delayed injury responses. Here, we show that for the optimal protocol condition of plunge at the -40 °C interrupt temperature, HUVEC and PCEC monolayers exhibited no significant immediate post-thaw injuries nor delayed injury responses during the 24-h post-thaw overnight culture period. HUVEC monolayers experienced no significant impact to their natural growth rate during the post-thaw culture, while PCEC monolayers experienced significantly higher growth than the unfrozen controls. The difference in the low-temperature responses between HUVEC and PCEC monolayers was further shown under high temperature plunge conditions. At these suboptimal plunge temperatures, HUVEC monolayers exhibited moderate immediate membrane injury but a pronounced delayed injury response during the 24-h post-thaw culture, while PCEC monolayers showed significant immediate membrane injury but no additional delayed injury response during the same period. Therefore, we provide further validation of our group's previously designed endothelial monolayer cryopreservation protocol for HUVEC and PCEC monolayers, and we identify several cell-type-specific responses to the freezing process.
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Affiliation(s)
- MingHan Yu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, T6G 1H9, Canada; Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, T6G 1C9, Canada
| | - Leah A Marquez-Curtis
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, T6G 1H9, Canada; Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, T6G 1C9, Canada
| | - Janet A W Elliott
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, T6G 1H9, Canada; Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, T6G 1C9, Canada.
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2
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Kalkan BM, Akgol S, Ak D, Yucel D, Guney Esken G, Kocabas F. CASIN and AMD3100 enhance endothelial cell proliferation, tube formation and sprouting. Microvasc Res 2020; 130:104001. [PMID: 32198058 DOI: 10.1016/j.mvr.2020.104001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 02/27/2020] [Accepted: 03/14/2020] [Indexed: 01/12/2023]
Abstract
Endothelial dysfunction is prominent in atherosclerosis, hypertension, diabetes, peripheral and cardiovascular diseases, and stroke. Novel therapeutic approaches to these conditions often involve development of tissue-engineered veins with ex vivo expanded endothelial cells. However, high cell number requirements limit these approaches to become applicable to clinical applications and highlight the requirement of technologies that accelerate expansion of vascular-forming cells. We have previously shown that novel small molecules could induce hematopoietic stem cell expansion ex vivo. We hypothesized that various small molecules targeting hematopoietic stem cell quiescence and mobilization could be used to induce endothelial cell expansion and angiogenesis due to common origin and shared characteristics of endothelial and hematopoietic cells. Here, we have screened thirty-five small molecules and found that CASIN and AMD3100 increase endothelial cell expansion up to two-fold and induce tube formation and ex vivo sprouting. In addition, we have studied how CASIN and AMD3100 affect cell migration, apoptosis and cell cycle of endothelial cells. CASIN and AMD3100 upregulate key endothelial marker genes and downregulate a number of cyclin dependent kinase inhibitors. These findings suggest that CASIN and AMD3100 could be further tested in the development of artificial vascular systems and vascular gene editing technologies. Furthermore, these findings may have potential to contribute to the development of alternative treatment methods for diseases that cause endothelial damage.
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Affiliation(s)
- Batuhan Mert Kalkan
- Regenerative Biology Research Laboratory, Department of Genetics and Bioengineering, Faculty of Engineering, Yeditepe University, Istanbul, Turkey; Koc University, Istanbul, Turkey
| | - Sezer Akgol
- Regenerative Biology Research Laboratory, Department of Genetics and Bioengineering, Faculty of Engineering, Yeditepe University, Istanbul, Turkey
| | - Deniz Ak
- Regenerative Biology Research Laboratory, Department of Genetics and Bioengineering, Faculty of Engineering, Yeditepe University, Istanbul, Turkey; Middle East Technical University, Ankara, Turkey
| | - Dogacan Yucel
- Faculty of Medicine, University of Minnesota, MN, USA
| | - Gulen Guney Esken
- Regenerative Biology Research Laboratory, Department of Genetics and Bioengineering, Faculty of Engineering, Yeditepe University, Istanbul, Turkey
| | - Fatih Kocabas
- Regenerative Biology Research Laboratory, Department of Genetics and Bioengineering, Faculty of Engineering, Yeditepe University, Istanbul, Turkey.
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3
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Glynn JJ, Hinds MT. Endothelial outgrowth cells regulate coagulation, platelet accumulation, and respond to tumor necrosis factor similar to carotid endothelial cells. Tissue Eng Part A 2014; 21:174-82. [PMID: 24965131 DOI: 10.1089/ten.tea.2014.0032] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Endothelial cells (ECs) are central regulators of hemostasis, inflammation, and other vascular processes. ECs have been used to cover vascular graft materials in an attempt to improve the biological integration of the grafts with the surrounding tissue. Although EC seeded grafts demonstrated improved patency, the invasive nature of EC harvest has limited the clinical translation of this technique. Endothelial outgrowth cells (EOCs) can be derived from circulating endothelial progenitor cells, which are noninvasively isolated from a peripheral blood draw. Although EOCs have been presumed to regulate hemostasis and inflammation similarly to arterial ECs, there has been limited research that directly compares EOCs to arterial ECs, particularly using pairs of donor-matched cells. This study provides a multifaceted characterization of hemostasis regulation by baboon EOCs and carotid ECs, both in the presence and absence of an inflammatory stimulus, tumor necrosis factor α (TNFα). The expression of genes involved in thrombosis and inflammation was highly similar between ECs and EOCs at a basal state and following TNFα stimulation. ECs and EOCs activated similar levels of protein C and Factor X (FX) at a basal state. Following TNFα treatment, EOCs had less of an increase in tissue factor activity than ECs. Cell-seeded expanded polytetrafluoroethylene vascular grafts demonstrated no significant differences between ECs and EOCs in platelet accumulation or fibrinogen incorporation in a baboon femoral arteriovenous shunt loop. This work demonstrates that EOCs regulate thrombus formation and respond to an inflammatory stimulus similar to ECs, and supports utilizing EOCs as a source for an autologous endothelium in tissue engineering applications.
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Affiliation(s)
- Jeremy J Glynn
- Department of Biomedical Engineering, Oregon Health & Science University , Portland, Oregon
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4
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Glynn JJ, Hinds MT. Endothelial outgrowth cells: function and performance in vascular grafts. TISSUE ENGINEERING PART B-REVIEWS 2013; 20:294-303. [PMID: 24004404 DOI: 10.1089/ten.teb.2013.0285] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The clinical need for vascular grafts continues to grow. Tissue engineering strategies have been employed to develop vascular grafts for patients lacking sufficient autologous vessels for grafting. Restoring a functional endothelium on the graft lumen has been shown to greatly improve the long-term patency of small-diameter grafts. However, obtaining an autologous source of endothelial cells for in vitro endothelialization is invasive and often not a viable option. Endothelial outgrowth cells (EOCs), derived from circulating progenitor cells in peripheral blood, provide an alternative cell source for engineering an autologous endothelium. This review aims at highlighting the role of EOCs in the regulation of processes that are central to vascular graft performance. To characterize EOC performance in vascular grafts, this review identifies the characteristics of EOCs, defines functional performance criteria for EOCs in vascular grafts, and summarizes the existing work in developing vascular grafts with EOCs.
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Affiliation(s)
- Jeremy J Glynn
- Department of Biomedical Engineering, Oregon Health & Science University , Portland, Oregon
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5
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Jun HW, West J. Development of a YIGSR-peptide-modified polyurethaneurea to enhance endothelialization. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 15:73-94. [PMID: 15027844 DOI: 10.1163/156856204322752246] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Polyurethanes have been investigated for use as vascular grafts due to their excellent mechanical properties and relatively good biocompatibility. However, poor retention of endothelial cells and thrombogenicity in vivo remain problematic for vascular graft applications. The peptide YIGSR has been shown to increase endothelial cell adhesion but not attachment of platelets, suggesting its possible utility for vascular graft applications. In this study, a bioactive polyurethaneurea has been synthesized by incorporating GGGYIGSRGGGK peptide sequences into the polymer backbone. Successful incorporation of the peptides was confirmed by NMR, contact angle measurement and ESCA. Uniform distribution of peptides on the surface was observed using a fluorescent probe capable of reacting with tyrosine residues on the peptides. Hard segment domains were visualized using tapping mode AFM. Endothelial cell adhesion, spreading, proliferation, migration and extra-cellular matrix production were improved on bioactive polyurethaneurea compared to control polyurethaneurea. Competitive inhibition of endothelial cell attachment and spreading by soluble YIGSR peptides indicated that cell adhesion and spreading were specifically mediated by YIGSR-sensitive cell adhesion receptor, not just by changed surface properties. There was no significant difference in the number of adherent platelets. Therefore, this bioactive polyurethanurea may improve vascular graft endothelialization without increasing thrombogenicity.
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Affiliation(s)
- Ho-Wook Jun
- Department of Bioengineering, Rice University, 6100 Main Street MS 142, Houston, TX 77005-1892, USA
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6
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Xiang P, Li M, Zhang CY, Chen DL, Zhou ZH. Cytocompatibility of electrospun nanofiber tubular scaffolds for small diameter tissue engineering blood vessels. Int J Biol Macromol 2011; 49:281-8. [PMID: 21600916 DOI: 10.1016/j.ijbiomac.2011.05.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Revised: 04/30/2011] [Accepted: 05/03/2011] [Indexed: 11/18/2022]
Abstract
A tubular scaffold was fabricated by using electrospun polymer solution blends of pNSR32 (recombinant spider silk protein), PCL (polycaprolactone) and Gt (gelatin). The physicochemical properties and cytocompatibility of these scaffolds were investigated. Afterwards, the pNSR32/PCL/Gt tubular scaffold (inner diameter=3mm) showed high porosity of 86.2 ± 2.9%, pore size of 2423 ± 979nm and average fibre diameter of 166 ± 85nm. Water uptake and contact angle of the scaffolds reached 112.0 ± 4.4% and 45.7 ± 13.7°, respectively. SDRAECs (Sprague Dawley Rat Aortic Endothelial Cells) grew and proliferated well and phenotype could be maintained on the composite scaffolds after they had been cultured on the composite scaffolds for 7 days. Compared with pure PCL scaffolds a greater density of viable cells was seen on the composites, especially the pNSR32/PCL/Gt scaffolds.
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Affiliation(s)
- Ping Xiang
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350108, People's Republic of China
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7
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Byrom MJ, Bannon PG, White GH, Ng MKC. Animal models for the assessment of novel vascular conduits. J Vasc Surg 2010; 52:176-95. [PMID: 20299181 DOI: 10.1016/j.jvs.2009.10.080] [Citation(s) in RCA: 130] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2010] [Revised: 09/25/2009] [Accepted: 10/04/2010] [Indexed: 11/19/2022]
Abstract
The development of an ideal small-diameter conduit for use in vascular bypass surgery has yet to be achieved. The ongoing innovation in biomaterial design generates novel conduits that require preclinical assessment in vivo, and a number of animal models have been used for this purpose. This article examines the rationale behind animal models used in the assessment of small-diameter vascular conduits encompassing the commonly used species: baboons, sheep, pigs, dogs, rabbits, and rodents. Studies on the comparative hematology for these species relative to humans are summarized, and the hydrodynamic values for common implant locations are also compared. The large- and small-animal models are then explored, highlighting the characteristics of each that determine their relative utility in the assessment of vascular conduits. Where possible, the performance of expanded polytetrafluoroethylene is given in each animal and in each location to allow direct comparisons between species. New challenges in animal modeling are outlined for the assessment of tissue-engineered graft designs. Finally, recommendations are given for the selection of animal models for the assessment of future vascular conduits.
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8
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Wang W, Liu Y, Wang J, Jia X, Wang L, Yuan Z, Tang S, Liu M, Tang H, Yu Y. A Novel Copolymer Poly(Lactide-co-β-Malic Acid) with Extended Carboxyl Arms Offering Better Cell Affinity and Hemacompatibility for Blood Vessel Engineering. Tissue Eng Part A 2009; 15:65-73. [DOI: 10.1089/ten.tea.2007.0394] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Wei Wang
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin, China
| | - Yuan Liu
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin, China
| | - Jun Wang
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin, China
| | - Xiaohua Jia
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin, China
| | - Liang Wang
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin, China
| | - Zhi Yuan
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin, China
| | - Shiming Tang
- Tianjin Life Science Research Center, Tianjin Medical University, Tianjin, China
| | - Min Liu
- Tianjin Life Science Research Center, Tianjin Medical University, Tianjin, China
| | - Hua Tang
- Tianjin Life Science Research Center, Tianjin Medical University, Tianjin, China
| | - Yaoting Yu
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University, Tianjin, China
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9
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Bodin A, Ahrenstedt L, Fink H, Brumer H, Risberg B, Gatenholm P. Modification of Nanocellulose with a Xyloglucan–RGD Conjugate Enhances Adhesion and Proliferation of Endothelial Cells: Implications for Tissue Engineering. Biomacromolecules 2007; 8:3697-704. [DOI: 10.1021/bm070343q] [Citation(s) in RCA: 169] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aase Bodin
- Biopolymer Technology, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden, School of Biotechnology, Royal Institute of Technology, Alba Nova University Centre, SE-106-91 Stockholm, Sweden, and Vascular Engineering Centre, Institution of Clinical Sciences, Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Lage Ahrenstedt
- Biopolymer Technology, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden, School of Biotechnology, Royal Institute of Technology, Alba Nova University Centre, SE-106-91 Stockholm, Sweden, and Vascular Engineering Centre, Institution of Clinical Sciences, Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Helen Fink
- Biopolymer Technology, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden, School of Biotechnology, Royal Institute of Technology, Alba Nova University Centre, SE-106-91 Stockholm, Sweden, and Vascular Engineering Centre, Institution of Clinical Sciences, Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Harry Brumer
- Biopolymer Technology, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden, School of Biotechnology, Royal Institute of Technology, Alba Nova University Centre, SE-106-91 Stockholm, Sweden, and Vascular Engineering Centre, Institution of Clinical Sciences, Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Bo Risberg
- Biopolymer Technology, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden, School of Biotechnology, Royal Institute of Technology, Alba Nova University Centre, SE-106-91 Stockholm, Sweden, and Vascular Engineering Centre, Institution of Clinical Sciences, Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Paul Gatenholm
- Biopolymer Technology, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden, School of Biotechnology, Royal Institute of Technology, Alba Nova University Centre, SE-106-91 Stockholm, Sweden, and Vascular Engineering Centre, Institution of Clinical Sciences, Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
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10
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Rashid ST, Salacinski HJ, Hamilton G, Seifalian AM. The use of animal models in developing the discipline of cardiovascular tissue engineering: a review. Biomaterials 2004; 25:1627-37. [PMID: 14697864 DOI: 10.1016/s0142-9612(03)00522-2] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Cardiovascular disease remains one of the major causes of death and disability in the Western world. Tissue engineering offers the prospect of being able to meet the demand for replacement of heart valves, vessels for coronary and lower limb bypass surgery and the generation of cardiac tissue for addition to the diseased heart. In order to test prospective tissue-engineered devices, these constructs must first be proven in animal models before receiving CE marking or FDA approval for a clinical trial. The choice of animal depends on the nature of the tissue-engineered construct being tested. Factors that need to be considered include technical requirements of implanting the construct, availability of the animal, cost and ethical considerations. In this paper, we review the history of animal studies in cardiovascular tissue engineering and the uses of animal tissue as sources for tissue engineering.
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Affiliation(s)
- S Tawqeer Rashid
- Tissue Engineering Centre, University Department of Surgery, Royal Free and University College Medical School, University College London, Royal Free Hospital, Pond Street, London, NW3 2QG, UK
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11
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Jun HW, West JL. Modification of polyurethaneurea with PEG and YIGSR peptide to enhance endothelialization without platelet adhesion. ACTA ACUST UNITED AC 2004; 72:131-9. [PMID: 15389489 DOI: 10.1002/jbm.b.30135] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Improved endothelialization without platelet adhesion is essential to enhance the long-term patency of synthetic vascular grafts and other blood-contacting devices. We have developed a dually modified polyurethaneurea by incorporating endothelial cell adhesive YIGSR peptide sequences as chain extenders and nonthrombogenic PEG as a soft segment (PUUYIGSR-PEG) in the polymer backbone. PUUYIGSR-PEG was successfully synthesized and characterized by proton NMR, FTIR, GPC, DSC, ESCA, and contact angle measurement. Despite having similar molecular weight, the peptide/PEG-modified polyurethaneurea (PUUYIGSR-PEG) showed superior mechanical properties compared to the control PEG-modified polyurethaneurea (PUUPPD-PEG). Virtually no platelet adhesion was observed on PUUYIGSR-PEG, while endothelial cell adhesion, spreading, and migration were significantly greater on PUUYIGSR-PEG compared to PUUPPD-PEG. Thus, this bioactive polymer may be an appropriate biomaterial for small diameter vascular grafts.
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Affiliation(s)
- Ho-Wook Jun
- Department of Bioengineering, Rice University, 6100 Main Street, MS 142, Houston, Texas 77005-1892, USA
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12
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Stone D, Phaneuf M, Sivamurthy N, LoGerfo FW, Quist WC. A biologically active VEGF construct in vitro: implications for bioengineering-improved prosthetic vascular grafts. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2002; 59:160-5. [PMID: 11745549 DOI: 10.1002/jbm.1229] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Prosthetic arterial grafts are unable to develop an intact endothelial lining after implantation, predisposing them to fail. Strategies have been sought to enhance endothelialization using growth factors and cytokines. This study assessed the biologic activity of vascular endothelial growth factor (VEGF) covalently linked to bovine serum albumin (BSA). Native and modified VEGF were assayed for endothelial cell migration and proliferation. Migration assays were performed comparing the effects of 2% fetal bovine serum (FBS), 50 ng/mL, 100 ng/mL, and 200 ng/mL of native VEGF and VEGF-BSA. Proliferation assays were performed by using Alamar Blue comparing cellular growth in 1% FBS, 10% FBS, 100 ng/mL unbound VEGF, and 100 ng/mL VEGF-BSA. VEGF is a potent chemotactic agent for endothelial cells in both unbound and bound states. Native VEGF solutions (50 ng/mL, 100 ng/mL, and 200 ng/mL) stimulated 23.9 cells/high power field (HPF), 35.3 cells/HPF, and 49.1 cells/HPF (p < 0.005). VEGF-BSA solutions stimulated 25.9 cells/HPF, 39.1 cells/HPF, and 69.0 cells/HPF (p < 0.001). VEGF-BSA and native VEGF supported similar increased cellular proliferation compared with 1% FBS media (p < 0.002). Modified VEGF retains its chemotactic and proliferative properties in vitro. These findings suggest that bare prosthetic surfaces lined with VEGF bound to a "basecoat" albumin may support endothelial cell proliferation and migration and thereby offer new strategies to improve graft patency.
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Affiliation(s)
- David Stone
- Department of Surgery, Division of Vascular Surgery, Beth Israel Deaconess Medical Center, Vascular Surgery Research Laboratory, Harvard Institute of Medicine Building, 4 Blackfan Circle, Room 130, Boston, Massachusetts 02115, USA.
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13
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Ophthalmic artery fed by posterior communicating artery after trapping of the internal carotid artery. J Clin Neurosci 1998; 5:90-2. [DOI: 10.1016/s0967-5868(98)90211-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/1995] [Accepted: 12/15/1995] [Indexed: 11/20/2022]
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14
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Kobayashi H, Ide H, Kabuto M, Handa Y, Kubota T. Endothelial-cell injury of the basilar artery caused by ethanol infusion in dogs. Acta Neurochir (Wien) 1996; 138:84-9. [PMID: 8686531 DOI: 10.1007/bf01411730] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
This study in mongrel dogs was designed to observe the effects of ethanol on both endothelial cells of the basilar artery and brain function. By use of sterile surgical technique, a super-selective catheter was placed in the proximal portion of the basilar artery in the dogs. Five dogs received 3 ml of 25% ethanol and 5 dogs received 3 ml of 50% of ethanol through the catheter over 2 minutes. The remaining 5 dogs received 3 ml of saline as a control. Auditory brain stem response (ABR) was monitored for 2 hours after ethanol infusion, and then perfusion-fixation was performed from the heart with 4% paraformaldehyde. The basilar artery was observed with scanning electron microscopy after routine procedures. The endothelial cells were intact in the control group. The 50% group showed a higher level of injury to the endothelium as well as a higher degree of platelet adhesion and fibrin clot formation compared with the 25% group. The extensive endothelial-cell damage subsequently caused thrombus formation. The ABR disappeared immediately after ethanol infusion in both ethanol groups, and recovered gradually in the 25% group, but did not re-appear during the time course of 2 hours in the 50% group. The ethanol less than 25% in concentration near the endothelium is considered to be safe as a transcatheter embolic agent with the attention to the central toxicity.
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MESH Headings
- Animals
- Basilar Artery/drug effects
- Basilar Artery/pathology
- Brain Stem/blood supply
- Brain Stem/drug effects
- Brain Stem/pathology
- Dogs
- Dose-Response Relationship, Drug
- Embolization, Therapeutic
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/pathology
- Ethanol/toxicity
- Evoked Potentials, Auditory, Brain Stem/drug effects
- Evoked Potentials, Auditory, Brain Stem/physiology
- Female
- Fibrin/metabolism
- Infusions, Intra-Arterial
- Male
- Microscopy, Electron, Scanning
- Platelet Adhesiveness/drug effects
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Affiliation(s)
- H Kobayashi
- Department of Neurosurgery, Fukui Medical School, Japan
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15
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Bonzon N, Lefebvre F, Ferre N, Daculsi G, Rabaud M. New bioactivation mode for vascular prostheses made of Dacron polyester. Biomaterials 1995; 16:747-51. [PMID: 7492704 DOI: 10.1016/0142-9612(95)99636-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The performance of vascular prostheses, especially those of small calibre, still presents several problems. The use of polyesters such as the well-known poly(ethylene terephthalate) (Dacron) and, more recently, poly(tetrafluoroethylene) and polyurethanes provides a marked improvement. We have developed a process to increase the efficiency of such prostheses, using the ability of the Dacron polyester to be covalently modified by proteins under mild chemical conditions. The biomaterial is obtained from the particular interaction of elastin-solubilized peptides with type I + III collagens under very precise conditions. We have obtained an irreversible covalent bonding on Dacron. These biological conditions and the addition of connective proteins and glycosaminoglycans conferred on the resulting material a composition and a three-dimensional structure equivalent to the subendothelium, providing bioactive properties suitable for the development of a vascular prosthesis.
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Affiliation(s)
- N Bonzon
- Unité 306, INSERM, Université de Bordeaux II, France
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16
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Thomas GA, Lelkes PI, Chick DM, Lu H, Kowal TA, Hammond RL, Nakajima H, Nakajima H, Spanta AD, Stephenson LW. Endothelial lined skeletal muscle ventricles: open and percutaneous seeding techniques. J Card Surg 1995; 10:245-56. [PMID: 7626875 DOI: 10.1111/j.1540-8191.1995.tb00605.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Twelve bilateral skeletal muscle ventricles (SMVs) were constructed in six dogs by wrapping each latissimus dorsi muscle around a cylindrical, plastic mandrel (volume 30 cc). After 6 to 10 weeks, five dogs had one of their SMVs seeded with allogeneic cultured canine endothelial cells (8 x 10(6) cells/pouch) via an open technique, whil the contralateral SMV was seeded by percutaneous injection of cells into the space around the mandrel. After 1 week, the SMVs were excised. Viable, adherent endothelial cells were present in all seeded pouches; this was confirmed via fluorescent microscopy with several endothelial cell markers; KLH-2, dilacetylated low-density lipoprotein and antibodies to von Willebrand factor. The inner lining of the SMVs were also examined with scanning and transmission electron microscopy; the highest concentration of cells were seen at the apex where a continuous endothelial monolayer was observed. No significant difference in the distribution or the morphology of the endothelial lining was noted between the open and percutaneous seeding techniques. These data show that SMVs can be seeded with an endothelial monolayer using both open and percutaneous techniques.
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Affiliation(s)
- G A Thomas
- Department of Surgery, Wayne State University School of Medicine, Detroit, Michigan, USA
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