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

Un metodo semplice e riproducibile per preparare campioni di membrana da microvasi cerebrali appe...

JoVE Journal
Neuroscience

A subscription to JoVE is required to view this content. Sign in or start your free trial.

JoVE Journal Neuroscience

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

Un metodo semplice e riproducibile per preparare campioni di membrana da microvasi cerebrali appena isolati del ratto

Full Text

10,881 Views

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

Please note that some of the translations on this page are AI generated. Click here for the English version.

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.

Qui, è descritto un metodo per l'isolamento dei microvasi cerebrali di ratto e per la preparazione di campioni di membrana. Questo protocollo ha il chiaro vantaggio di produrre arricchito del microvessel campioni con proteina accettabile resa da singoli animali. Campioni possono quindi essere utilizzati per analisi di robusta proteina presso l'endotelio microvascolare cerebrale.

L'obiettivo generale di questa procedura è isolare i microvasi cerebrali dal cervello di ratto per studi biochimici volti a comprendere le caratteristiche molecolari della barriera emato-encefalica dei mammiferi. Questo metodo può aiutare a rispondere a domande chiave nella fisiologia della barriera emato-encefalica e nella neurofarmacologia, come la regolazione, la localizzazione e l'espressione delle proteine della giunzione stretta e dei trasportatori endogeni in salute e malattia. Il vantaggio principale di questa tecnica è che possiamo isolare un numero sufficiente di microvasi di alta qualità da un singolo animale, tenendo conto della variabilità naturale nell'espressione proteica tra i singoli animali.

A dimostrare questa tecnica sarà Bianca Reilly, un'eccezionale studentessa universitaria del mio laboratorio. Dopo l'eutanasia e la decapitazione di un ratto Sprague-Dawley secondo il protocollo di testo, utilizzare le forbici chirurgiche per resecare la pelle dal cranio del ratto eseguendo un singolo taglio trasversale. Usando i rongeur, rimuovere con cura la placca cranica ed esporre il cervello.

View the full transcript and gain access to thousands of scientific videos