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

JoVE Journal
Neuroscience

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JoVE Journal Neuroscience

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

新鮮単離ラット脳微小循環から膜のサンプルを準備するシンプルで再現性のある方法

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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.

ここでは、ラット脳微小血管の分離膜試料の調製の方法を説明します。このプロトコルには、個々の動物から得られる許容可能なタンパク質試料濃縮微小血管を生産の明確な利点があります。サンプルは、脳微小血管内皮細胞で堅牢なタンパク質解析に使用できます。

この手順の全体的な目標は、哺乳類の血液脳関門の分子特性を理解することを目的とした生化学的研究のために、ラットの脳から脳の微小血管を分離することです。この方法は、健康や疾患におけるタイトジャンクションタンパク質や内因性トランスポーターの調節、局在化、発現など、血液脳関門生理学や神経薬理学における重要な疑問に答えるのに役立ちます。この技術の主な利点は、個々の動物間のタンパク質発現の自然な変動性を考慮しながら、個々の動物から十分な数の高品質の微小血管を分離できることです。

この手法を実演するのは、私の研究室の優秀な学部生であるビアンカ・ライリーです。テキストプロトコルに従ってSprague-Dawleyラットを安楽死させ、首を切った後、外科用ハサミを使用して、横方向の切り傷を1回作成してラットの頭蓋骨から皮膚を切除します。ロンゲールを使用して、頭蓋骨プレートを慎重に取り外し、脳を露出させます。

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