Specific Targeting of Human Inflamed Endothelium and In Situ Vascular Tissue Transfection by the Use of Ultrasound Contrast Agents
Olga Barreiro, PhD*, ,
Río J. Aguilar, MD, PhD ,
Emilio Tejera, PhD*,,
Diego Megías, PhD ,
Fernando de Torres-Alba, MD,
Arturo Evangelista, MD, PhD,
Francisco Sánchez-Madrid, PhD*,,*
* Servicio de Inmunología, Hospital de la Princesa, Universidad Autónoma de Madrid, Madrid, Spain
Departamento de Biología Vascular e Inflamación, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain
Servicio de Cardiología, Hospital Vall d'Hebron, Barcelona, Spain
Unidad de Microscopía, Centro Nacional de Investigaciones Oncológicas, Madrid, Spain
* Reprint requests and correspondence: Dr. Francisco Sánchez-Madrid, Servicio de Inmunología, Hospital de la Princesa, Universidad Autónoma de Madrid, C/ Diego de León 62, 28006 Madrid, Spain (Email: fsanchez.hlpr{at}salud.madrid.org).
Objectives: We used human umbilical cord segments as an ex vivo model to investigate the possible clinical diagnostic and therapeutic applications of microbubbles (MBs).
Background: Microbubbles are commonly used in clinical practice as ultrasound contrast agents. Several studies have addressed the in vivo applications of MBs for specific targeting of vascular dysfunction or sonoporation in animal models, but to date no human tissue model has been established.
Methods: Primary venular endothelial cell monolayers were targeted with MBs conjugated to an antibody against a highly expressed endothelial marker (tetraspanin CD9), and binding was assessed under increasing flow rates (0.5 to 5 dynes/cm2). Furthermore, CD9-coupled MB endothelial targeting was measured under flow conditions by contrast-enhanced ultrasound analysis in an ex vivo human macrovascular model (umbilical cord vein), and the same tissue model was used for the detection of inflamed vasculature with anti-intercellular adhesion molecule (ICAM)-1–coated MBs. Finally, plasmids encoding fluorescent proteins were sonoporated into umbilical cord vessels.
Results: Specific endothelial targeting in the in vitro and ex vivo models described previously was achieved by the use of MBs covered with an anti-CD9. Furthermore, we managed to induce inflammation in umbilical cord veins and detect it with real-time echography imaging using anti–ICAM-1–coupled MBs. Moreover, expression and correct localization of green fluorescent protein and green fluorescent protein-tagged ICAM-1 were assessed in this human ex vivo model without causing vascular damage.
Conclusions: In the absence of clinical trials to test the benefits and possible applications of ultrasound contrast agents for molecular imaging and therapy, we have developed a novel ex vivo human model using umbilical cords that is valid for the detection of inflammation and for exogenous expression of proteins by sonoporation.
Key Words: ultrasound • microbubbles • human umbilical cord • targeting • inflammation • sonoporation
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Abbreviations and Acronyms
| | EGFP = enhanced green fluorescent protein | | HUVEC = human umbilical vein endothelial cell | | ICAM = intercellular adhesion molecule | | MB = microbubble | | TNF = tumor necrosis factor | | US = ultrasound |
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