Quantification of Microglial Engulfment of Synaptic Material Using Flow Cytometry

Bilge Ugursu; Susanne A. Wolf

doi:10.3791/66639

Quantificazione dell'inghiottimento microgliale di materiale sinaptico mediante citometria a flusso

JoVE Journal
Neuroscience

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JoVE Journal Neuroscience

Quantification of Microglial Engulfment of Synaptic Material Using Flow Cytometry

Quantificazione dell'inghiottimento microgliale di materiale sinaptico mediante citometria a flusso

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07:41 min

May 31, 2024

DOI: 10.3791/66639-v

Bilge Ugursu¹, Susanne A. Wolf^1,2

¹Psychoneuroimmunology,Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, ²Experimental Ophthalmology,Charité Universitätsmedizin Berlin

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Overview

This study presents protocols to measure microglial engulfment of vGLUT1-positive synapses and pHRodo Red-labeled crude synaptosomes using flow cytometry. The research focuses on understanding the role of microglia in brain function and disease pathology.

Key Study Components

Area of Science

Neuroscience
Immunology
Flow Cytometry

Background

Microglia are key players in neuroimmune interactions.
Engulfment of synaptic material is crucial for understanding microglial functions.
Recent advancements in technologies like RNA sequencing are aiding in immune-based therapies.
Understanding the immune status of patients is essential for tailored treatments.

Purpose of Study

To quantify microglial engulfment of synaptic material.
To inspire the inclusion of functional assays in microglial research.
To provide insights into the role of microglia in brain function and diseases.

Methods Used

Flow cytometry was utilized to assess microglial engulfment.
The main biological model involved dissociated mouse hippocampi tissue.
Protocols included various centrifugation and staining steps for cell isolation and analysis.
Key steps included filtering, staining for CD16/CD32, and VGLUT1 detection.
Microscopy and flow cytometry were essential for analyzing fluorescence signals.

Main Results

Higher VGLUT1-PE fluorescent signals were observed in microglia from the hippocampus compared to isotype controls.
Differences in fluorescence intensity were noted across various brain regions.
The method enabled reliable quantification of microglial activity related to synaptic material.

Conclusions

This study establishes a method for quantifying microglial engulfment of synapses.
The findings enhance understanding of neuroimmune interactions and microglial roles in health and disease.
Insights gained could lead to novel approaches in studying microglia's influence on neuronal mechanisms.

Frequently Asked Questions

What is the advantage of using flow cytometry in this study?

Flow cytometry allows for rapid and precise quantification of microglial engulfment, providing reliable data on cell activity.

How are the mouse hippocampi prepared for analysis?

Dissociated mouse hippocampi are homogenized and filtered to isolate microglial cells for subsequent flow cytometric analysis.

What types of outcomes are obtained from this method?

Data on microglial engulfment and distinct fluorescence signals indicating activity levels of microglia are obtained.

How can this method be applied to other research areas?

The protocols can be adapted to study various interactions between immune cells and neuronal components in different contexts.

What limitations are there in the current protocols?

The protocols may require careful optimization for various tissue types and may not be applicable across all species.

What insights does this study provide regarding microglial function?

It sheds light on the engulfment mechanisms of microglia and their potential impact on synaptic function and overall brain health.

How does this research contribute to understanding neuroimmune interactions?

It offers a clearer picture of microglial roles in synaptic maintenance and pathology, helping to inform therapeutic strategies.

Qui presentiamo due protocolli per quantificare l'inghiottimento microgliale delle sinapsi vGLUT1-positive e dei sinaptosomi grezzi marcati con pHRodo Red utilizzando la citometria a flusso.

La nostra ricerca si concentra sulla psiconeuroimmunologia e studiamo il crosstalk del sistema immunitario con il cervello e la mente. Sono particolarmente interessato a decifrare sottogruppi di pazienti in base al loro stato immunitario per trovare trattamenti su misura per loro. I recenti sviluppi nel nostro campo includono, ad esempio, lo sviluppo di ligandi PET, ma includono anche tecnologie avanzate come il sequenziamento dell'RNA, il sequenziamento dell'RNA a singola cellula e il sequenziamento spaziale dell'RNA per decifrare le terapie basate sul sistema immunitario.

Il nostro protocollo affronta la sfida di quantificare l'inghiottimento microgliale del materiale sinaptico, che è fondamentale per comprendere il ruolo nella funzione cerebrale e nella patologia della malattia. Il nostro protocollo offre una quantificazione rapida e affidabile del materiale sinaptico inghiottito dalla microglia, e quindi fornisce informazioni sull'attività funzionale della microglia. Il nostro protocollo ispirerà altri gruppi di ricerca a includere saggi più funzionali nella loro ricerca, come i motosinaptosomi inghiottiti, e questo porterà a una comprensione migliore e più completa del ruolo della microglia nelle interazioni neuroimmunitarie.

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Parole chiave: Microglia Materiale sinaptico Citometria a flusso Raffinamento sinaptico Immunoistochimica Rosso PHrodo Sinaptosomi Isolamento cellulare In vivo In vitro Alto rendimento Quantificazione