Sample Preparation for Rapid Lipid Analysis in <em>Drosophila</em> Brain Using Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry Imaging

Yuki X. Chen; Kelly Veerasammy; Jun Yin; Tenzin Choetso; Tiffany Zhong; Muniyat A. Choudhury; Cory Weng; Ethan Xu; Mayan A. Hein; Rinat Abzalimov; Ye He

doi:10.3791/63930

Sample Preparation for Rapid Lipid Analysis in Drosophila Brain Using Matrix-Assisted La...

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Sample Preparation for Rapid Lipid Analysis in Drosophila Brain Using Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry Imaging

Sample Preparation for Rapid Lipid Analysis in Drosophila Brain Using Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry Imaging

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09:00 min

July 14, 2022

DOI: 10.3791/63930-v

Yuki X. Chen*^1,5,6, Kelly Veerasammy*^1,2, Jun Yin*³, Tenzin Choetso^1,4, Tiffany Zhong⁷, Muniyat A. Choudhury^1,4,5, Cory Weng^1,4,5, Ethan Xu⁸, Mayan A. Hein^9,10, Rinat Abzalimov², Ye He¹

¹Advanced Science Research Center, Neuroscience Initiative,the City University of New York, Graduate Center New York, ²Advanced Science Research Center, Structural Biology Initiative,the City University of New York, Graduate Center, ³National Institute of Neurological Disorders and Stroke,National Institutes of Health, ⁴The City College of New York,CUNY, ⁵Macaulay Honors College,CUNY, ⁶Graduate School of Public Health and Health Policy,The City University of New York, ⁷Princeton University, ⁸Ardrey Kell High School, ⁹The Borough of Manhattan Community College,CUNY, ¹⁰Gallatin School of Individualized Study,New York University

Overview

This protocol offers thorough guidance on preparing lipid and metabolite samples from small tissues, such as the Drosophila brain, employing matrix-assisted laser desorption/ionization (MALDI) mass spectrometry imaging. The method allows for the visualization of lipid distribution without significant sample modification.

Key Study Components

Research Area

Metabolite analysis
Lipid distribution
Mass spectrometry imaging

Background

MALDI mass spectrometry imaging is critical for lipid detection in situ.
Minimizing sample preparation time is essential to avoid contamination.
The methodology supports simultaneous analysis of large sample populations.

Methods Used

Sample preparation involves optimizing the cutting temperature and embedding tissues in optimal cutting temperature (OCT) compound.
Drosophila melanogaster is utilized as a model organism.
The MALDI imaging technology enables detailed lipid abundance assessment.

Main Results

Successful preparation and sectioning of Drosophila brain tissues for imaging.
Ensured accurate lipid visualization and analysis through proper sample handling.
Validated methodology enhances the reliability of mass spectrometry imaging data.

Conclusions

This study illustrates the efficacy of MALDI mass spectrometry imaging for lipid analysis in small tissue samples.
It contributes valuable techniques for ongoing biological research into lipids and metabolites.

Frequently Asked Questions

What is the main advantage of MALDI imaging?

MALDI imaging allows for the detection of lipids in situ without labeling.

Why is it important to minimize sample preparation time?

Minimizing preparation time reduces the risk of contamination in the samples.

What model organism is used in this protocol?

Drosophila melanogaster, commonly known as the fruit fly, is used.

How is the OCT compound prepared?

OCT is added to a plastic cryomold and solidified on dry ice to create a support for tissue embedding.

What are the storage conditions for the prepared samples?

Samples should be stored at minus 80 degrees Celsius until sectioning.

What technology is employed for lipid imaging?

Matrix-assisted laser desorption/ionization (MALDI) mass spectrometry imaging is used.

What is one key consideration during the sectioning process?

Maintaining the correct temperature in the cryostat chamber is crucial for successful sectioning.

The aim of this protocol is to provide detailed guidance on the proper sample preparation for lipid and metabolite analysis in small tissues, such as the Drosophila brain, using matrix-assisted laser desorption/ionization (MALDI) mass spectrometry imaging.

Maldi MS spectrometry imaging is an established and useful tool to identify and visualize lipid abundance and distribution, without excessive sample modification. The main advantage of Maldi imaging is its ability to detect the lipids in situ without labeling, and analyze large population of samples simultaneously. Practice makes perfect.

Make sure you practice well before processing the real experimental samples. Minimize the sample preparation time and avoid contamination throughout the procedure. To begin, add the optimal cutting temperature, or OCT into a plastic cryomold to half of the depth of the cryo mold while avoiding bubble formation.

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