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Biology
In vivo Detección de permeabilidad vascular en glándula submandibular de ratón
In vivo Detección de permeabilidad vascular en glándula submandibular de ratón
JoVE Journal
Biology
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JoVE Journal Biology
In Vivo Vascular Permeability Detection in Mouse Submandibular Gland

In vivo Detección de permeabilidad vascular en glándula submandibular de ratón

Full Text
2,582 Views
07:10 min
August 4, 2022

DOI: 10.3791/64167-v

Xiangdi Mao1, Sainan Min2, Qihua He3, Xin Cong1

1Department of Physiology and Pathophysiology, Peking University School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Sciences,Ministry of Education, and Beijing Key Laboratory of Cardiovascular Receptors Research, 2Department of Oral and Maxillofacial Surgery,Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Reseah Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, 3State Key Laboratory of Natural and Biomimetic Drugs,Peking University

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Overview

This study evaluates the endothelial barrier function of the submandibular gland (SMG) using in vivo imaging techniques. Fluorescent tracers of varying molecular weights were injected into test animal models, demonstrating how molecular permeability can be assessed using two-photon laser scanning microscopy.

Key Study Components

Research Area

  • Endothelial barrier function
  • Vascular permeability studies
  • Fluorescent tracer application

Background

  • Importance of tight junctions in endothelial cells
  • Non-invasive imaging methods for tissue analysis
  • The role of submandibular glands in vascular studies

Methods Used

  • In vivo paracellular permeability detection
  • Mouse submandibular glands
  • Two-photon laser scanning microscopy

Main Results

  • Demonstrated varying leakage of fluorescent tracers based on molecular weight
  • Identified disruptions in endothelial barrier integrity due to duct ligation
  • Validated findings through fluorescence intensity quantification

Conclusions

  • The method provides insights into endothelial barrier function in tissues
  • Enhances understanding of vascular permeability related to physiological and pathological conditions

Frequently Asked Questions

What is the purpose of using different molecular weight tracers?
Using tracers of different molecular weights allows for assessing the permeability of tight junctions in endothelial cells.
How does two-photon laser scanning microscopy improve imaging?
This method enables deeper tissue imaging with less scattering compared to conventional techniques, providing clearer images.
What effects were observed when duct ligation was performed?
Duct ligation increased permeability, allowing larger molecular tracers to leak out, indicating a disruption in the endothelial barrier.
Why is proper SMG isolation critical in this protocol?
Careful isolation is essential to minimize artifacts and ensure accurate imaging and permeability assessments.
What are the applications of this imaging technique?
This technique can be applied to study vascular diseases, drug delivery systems, and tissue engineering.
What does the study reveal about vascular permeability in the SMG?
The findings provide a new understanding of how the SMG's endothelial barrier behaves under physiological challenges.

En el presente protocolo, la función de barrera endotelial de la glándula submandibular (SMG) se evaluó inyectando diferentes trazadores fluorescentes ponderados molecularmente en las venas angulares de modelos animales de prueba in vivo bajo un microscopio de escaneo láser de dos fotones.

El presente protocolo describe una medida de detección de permeabilidad paracelular in vivo para evaluar la función de las uniones endoteliales estrechas en glándulas submandibulares de ratón. Sin embargo, la microscopía de barrido láser de dos fotones no solo tiene la ventaja de la microscopía confocal convencional, sino que también se puede usar para detectar tejidos e imágenes más profundos con mayor claridad. Este experimento proporciona una buena medida de método para evaluar la permeabilidad vascular de diferentes tejidos, especialmente los tejidos superficiales y órganos de los animales.

Comience eligiendo trazadores apropiados como fluoresceína, isotiocianato, dextrano marcado y rodamina B, marcado como dextrano con espectros de emisiones de excitación distintos, para minimizar la interferencia entre las señales de fluorescencia para el ensayo de permeabilidad. Diluir las trazas en solución salina tamponada con fosfato estéril en 100 miligramos por mililitro y almacenar las alícuotas protegidas de la luz a menos 20 grados centígrados. Después de anestesiar al ratón macho de tipo salvaje de 8 a 10 semanas de edad, sostenga suavemente la cabeza y el cuello del ratón para hacer que un lado del globo ocular sobresalga ligeramente.

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