Periorbital Placement of a Laser Doppler Probe for Cerebral Blood Flow Monitoring Prior to Middle Cerebral Artery Occlusion in Rodent Models

Denali C. Dickson; Mitchell J. Bartlett; Sharon Hom; Helena W. Morrison

doi:10.3791/66839

JoVE Journal
Neuroscience

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JoVE Journal Neuroscience

Periorbital Placement of a Laser Doppler Probe for Cerebral Blood Flow Monitoring Prior to Middle Cerebral Artery Occlusion in Rodent Models

啮齿动物模型中激光多普勒探头在大脑中动脉闭塞前眶周放置用于脑血流监测

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03:26 min

November 22, 2024

DOI: 10.3791/66839-v

Denali C. Dickson¹, Mitchell J. Bartlett², Sharon Hom¹, Helena W. Morrison¹

¹College of Nursing,University of Arizona, ²Department of Surgery, College of Medicine,University of Arizona

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Overview

This study focuses on ischemic stroke, investigating the role of microglia, reperfusion injury, and sex differences in the brain. A minimally invasive surgical procedure is employed using a laser Doppler probe placed over the distal middle cerebral artery region in rats and mice to assess blood flow during transient MCA occlusion.

Key Study Components

Area of Science

Neuroscience
Stroke Research
Microglial Dynamics

Background

Ischemic stroke is a major cause of brain injury.
Microglia play a crucial role in response to ischemic conditions.
Variability in injury size necessitates larger sample sizes for statistical accuracy.
This study addresses critical challenges in reproducibility in stroke research.

Purpose of Study

To understand the impact of microglia on brain injury from ischemic stroke.
To investigate sex differences in stroke outcomes.
To develop targeted treatments for acute and chronic stroke.

Methods Used

The main platform involves laser Doppler flowmetry for assessing blood flow.
The biological model consists of rats and mice undergoing transient MCA occlusion.
No multiomics workflow is mentioned in the text.
The Laser Doppler probe is placed at a specific location on the skull for optimal results.
The method is noted for being minimally invasive and quick.

Main Results

The study reveals significant findings regarding microglial quantifications in response to acute and chronic ischemic stroke.
Challenges with laser Doppler flowmetry in rats due to skull thickness are highlighted.
Findings indicate variability in injury response necessitates larger sample sizes for reproducibility.
The study validates the advantages of the minimally invasive approach for blood flow assessment.

Conclusions

This study demonstrates the feasibility of using laser Doppler flowmetry in stroke research.
It provides insights into microglial roles in ischemic stroke, facilitating the development of targeted therapies.
Implications for understanding neuronal mechanisms and addressing challenges in stroke research are significant.

Frequently Asked Questions

What are the advantages of using laser Doppler flowmetry?

Laser Doppler flowmetry is minimally invasive, fast, and allows for real-time assessment of blood flow, making it ideal for studying stroke models.

How is the middle cerebral artery occlusion performed in this study?

The procedure involves transient occlusion of the middle cerebral artery in rats and mice, allowing for investigation of ischemic events and recovery.

What types of data are obtained from this method?

The primary outcome measures include blood flow dynamics and microglial responses, which are critical for understanding ischemic stroke pathology.

Can this method be adapted for other species?

While this study focuses on rats and mice, the principles of laser Doppler flowmetry could be adapted to other small animal models, though anatomical differences may need to be considered.

What limitations are associated with using laser Doppler flowmetry?

Limitations include challenges in placement due to skull thickness in certain species and potential variability in blood flow readings based on probe position.

How does this study contribute to the field of stroke research?

It offers a novel protocol for assessing blood flow, highlights critical challenges in reproducibility, and emphasizes the role of microglia in stroke outcomes.

What insights does the study provide about sex differences in stroke?

The research aims to uncover how sex differences affect brain injury responses and recovery, an area that is underexplored in current stroke literature.

这里显示了一种微创外科手术，其中包括将激光多普勒探头放置在大脑中动脉（MCA）远端区域的颅骨上，这是一个适合大鼠和小鼠的眶周位置，以评估短暂性 MCA 闭塞期间的血流。

我研究了缺血性中风，重点关注小胶质细胞、再灌注损伤和大脑中的性别差异。我的工作旨在了解这些因素如何影响脑损伤，并开发有针对性的治疗方法，以改善急性和慢性中风的治疗。可重复性和样本量是卒中研究中的关键挑战。

大脑中动脉闭塞手术损伤大小的可变性通常需要更大的样本量才能进行准确的统计测试，这可能被低估并影响我们领域科学的可重复性。我们最重要的发现和贡献围绕着小胶质细胞的量化以及从急性和慢性角度与缺血性中风的交叉。在 MCAO 中使用激光多普勒血流测定可能具有挑战性，尤其是在大鼠中，因为颅骨较厚，并且认为需要颅骨变薄和用于背探针放置的专用设备。

这些障碍可能会阻碍 LDF 的实施以确认灯丝放置。该方案概述了将激光多普勒探头放置在大脑中动脉远端区域眶周放置的颅骨上，以评估小鼠和大鼠在 MCAO 期间的血流。与其他方法相比，它具有微创、快速且只需要激光多普勒探头的优势。

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