A Simple and Reproducible Method to Prepare Membrane Samples from Freshly Isolated Rat Brain Microvessels

Hrvoje Brzica; Wazir Abdullahi; Bianca G. Reilly; Patrick T. Ronaldson

doi:10.3791/57698

Une méthode Simple et reproductible pour préparer les échantillons de la Membrane des microvaisse...

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Neuroscience

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JoVE Journal Neuroscience

A Simple and Reproducible Method to Prepare Membrane Samples from Freshly Isolated Rat Brain Microvessels

Une méthode Simple et reproductible pour préparer les échantillons de la Membrane des microvaisseaux de cerveau de Rat fraîchement isolées

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07:13 min

May 7, 2018

DOI: 10.3791/57698-v

Hrvoje Brzica*¹, Wazir Abdullahi*¹, Bianca G. Reilly¹, Patrick T. Ronaldson¹

¹Department of Pharmacology, College of Medicine,University of Arizona, Tucson

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Overview

This study presents a protocol for isolating rat brain microvessels to investigate the blood-brain barrier (BBB). The method allows for high-quality protein analyses from individual animals, facilitating the exploration of tight junction proteins and transporters related to neuropharmacology and physiology.

Key Study Components

Area of Science

Neuroscience
Protein Analysis
Blood-Brain Barrier Physiology

Background

The blood-brain barrier plays a crucial role in maintaining central nervous system homeostasis.
Understanding the molecular characteristics of the BBB can inform studies on neurological diseases.
This method accounts for variability in protein expression among different rats.
Enriched microvessel samples are essential for advancing neuropharmacological research.

Purpose of Study

To isolate cerebral microvessels from rat brains for biochemical studies.
To analyze molecular components associated with the BBB under various physiological conditions.
To evaluate the expression and regulation of specific proteins related to BBB function.

Methods Used

The main platform involves surgical techniques followed by homogenization and centrifugation of brain tissue.
The biological model consists of Sprague-Dawley rats, allowing for individual analysis of microvessel characteristics.
No multiomics workflow was mentioned.
Key steps include tissue resection, homogenization, and multiple centrifugation cycles to isolate microvessels.
Protein yield and purification are assessed through Western blotting and Bradford protein assays.

Main Results

Intact microvessels were successfully isolated and characterized for protein expression.
Enrichment of PECAM-1 (CD31) and Glut1 was confirmed in microvessel preparations.
Protein concentrations typically ranged from 5 to 10 mg/mL post-protocol.
A notable difference in Glut1 expression between male and female rats was observed.

Conclusions

This study provides a reliable method for isolating brain microvessels, paving the way for future research on the blood-brain barrier.
The protocol enhances understanding of neuropharmacological dynamics and BBB physiology.
Insights gained can inform better therapeutic approaches for neurological conditions.

Frequently Asked Questions

What are the advantages of this isolation method?

This method allows for the extraction of high-quality microvessel samples from individual rats, considering natural variability in protein expression, which enhances the reliability of subsequent analysis.

How is the rat brain prepared for isolation?

The rat is euthanized, the skull is removed, and the brain is carefully extracted while ensuring all meningeal tissue is discarded before homogenization.

What types of outcomes can be expected from this method?

Outcomes include insights into the molecular characteristics of the blood-brain barrier such as the expression levels of tight junction proteins and transporters.

How can this method be applied in research?

This isolation technique can be adapted for studies addressing various physiological and pathological conditions related to the blood-brain barrier.

Are there any limitations to this approach?

Attention to detail is crucial during tissue handling and centrifugation steps to ensure the integrity of isolated microvessels; any disruption could affect downstream applications.

Ici, on décrit une méthode pour l’isolement des microvaisseaux de cerveau de rat et pour la préparation des échantillons de la membrane. Ce protocole a l’avantage clair de produire des microvaisseaux enrichi échantillons avec la protéine acceptable donnent sur des animaux. Échantillons peuvent être ensuite utilisés pour les analyses de protéines robuste à l’endothélium microvasculaire cérébral.

L’objectif global de cette procédure est d’isoler les microvaisseaux cérébraux du cerveau du rat pour des études biochimiques visant à comprendre les caractéristiques moléculaires de la barrière hémato-encéphalique des mammifères. Cette méthode peut aider à répondre à des questions clés en physiologie de la barrière hémato-encéphalique et en neuropharmacologie, telles que la régulation, la localisation et l’expression des protéines de jonction serrée et des transporteurs endogènes dans la santé et la maladie. Le principal avantage de cette technique est que nous pouvons isoler un nombre suffisant de microvaisseaux de haute qualité à partir d’un animal individuel tout en tenant compte de la variabilité naturelle de l’expression des protéines entre les animaux individuels.

Bianca Reilly, une étudiante de premier cycle exceptionnelle de mon laboratoire, fera la démonstration de cette technique. Après avoir euthanasié et décapité un rat Sprague-Dawley selon le protocole textuel, utilisez des ciseaux chirurgicaux pour réséquer la peau du crâne du rat en faisant une seule coupe transversale. À l’aide de rongeurs, retirez soigneusement la plaque crânienne et exposez le cerveau.

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