The Arteriovenous (AV) Loop in a Small Animal Model to Study Angiogenesis and Vascularized Tissue Engineering
| Autor: | Majida Al-Abboodi, Anja M. Boos, Andreas Arkudas, Raymund E. Horch, Annika Weigand, Justus P. Beier, Elias Polykandriotis |
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| Rok vydání: | 2016 |
| Předmět: |
Arteriovenous Anastomosis
Angiogenesis General Chemical Engineering Neovascularization Physiologic Transplants Bioengineering Biology Regenerative medicine General Biochemistry Genetics and Molecular Biology Neovascularization Vasculogenesis Tissue engineering In vivo medicine Animals Humans General Immunology and Microbiology Tissue Engineering General Neuroscience Anatomy X-Ray Microtomography medicine.anatomical_structure Rats Inbred Lew Models Animal medicine.symptom Biomedical engineering Blood vessel |
| Zdroj: | Journal of visualized experiments : JoVE. (117) |
| ISSN: | 1940-087X |
| Popis: | A functional blood vessel network is a prerequisite for the survival and growth of almost all tissues and organs in the human body. Moreover, in pathological situations such as cancer, vascularization plays a leading role in disease progression. Consequently, there is a strong need for a standardized and well-characterized in vivo model in order to elucidate the mechanisms of neovascularization and develop different vascularization approaches for tissue engineering and regenerative medicine. We describe a microsurgical approach for a small animal model for induction of a vascular axis consisting of a vein and artery that are anastomosed to an arteriovenous (AV) loop. The AV loop is transferred to an enclosed implantation chamber to create an isolated microenvironment in vivo, which is connected to the living organism only by means of the vascular axis. Using 3D imaging (MRI, micro-CT) and immunohistology, the growing vasculature can be visualized over time. By implanting different cells, growth factors and matrices, their function in blood vessel network formation can be analyzed without any disturbing influences from the surroundings in a well controllable environment. In addition to angiogenesis and antiangiogenesis studies, the AV loop model is also perfectly suited for engineering vascularized tissues. After a certain prevascularization time, the generated tissues can be transplanted into the defect site and microsurgically connected to the local vessels, thereby ensuring immediate blood supply and integration of the engineered tissue. By varying the matrices, cells, growth factors and chamber architecture, it is possible to generate various tissues, which can then be tailored to the individual patient's needs. |
| Databáze: | OpenAIRE |
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