Mass Spectrometry: Recent Advancements in In Situ Metabolomics

A special issue of Metabolites (ISSN 2218-1989). This special issue belongs to the section "Metabolomic Profiling Technology".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 2353

Special Issue Editor


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Guest Editor
Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA
Interests: mass spectrometry imaging; omics; single-cell; biomaterials; implants

Special Issue Information

Dear Colleagues,

Over the past decade, metabolomics has advanced to the point where a variety of targeted and untargeted methods are available for characterization of the metabolome.
In situ metabolomics involves the removal, ionization, extraction, and identification of metabolites in tissue or cultures. There are now a variety of tools available for in situ metabolomics including liquid extraction surface analysis (LESA), matrix-assisted laser desorption/ionization (MALDI), and secondary ion  mass spectrometry (SIMS).
Increasingly, these modalities are being adapted to sample at smaller scales, with increased spatial resolutions, improved sensitivity, and better capability to assign structure through orthogonal methods. For example, many in situ methods can now be applied to decipher metabolic profiles at the single cell scale with femtomolar sensitivities.
This Special Issue on “Recent Advancements in In Situ Metabolomics” is devoted to analytical methods that employ in situ mass spectrometry sampling methods for metabolomics.

Papers are invited which address sample preparation, application of new and available sampling modes, data analysis strategies, and any aspects of in situ metabolomics which improve workflows. We also invite manuscripts dealing with other pertinent challenging issues including automated (high-throughput) approaches toward metabolite extraction and identification, novel data processing methods, and metabolite annotation pipelines. Reviews and perspectives of the challenges of in situ metabolomics are also welcomed.

Sincerely,

Dr. Mike Taylor
Guest Editor

Manuscript Submission Information

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Keywords

  • in situ metabolomics
  • spatial-omics
  • sample preparation
  • mass spectrometry imaging/ imaging mass spectrometry
  • single-cell metabolomics
  • reviews and perspectives

Published Papers (1 paper)

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Research

11 pages, 2336 KiB  
Article
Ischemic Stroke Causes Disruptions in the Carnitine Shuttle System
by Leonidas Mavroudakis and Ingela Lanekoff
Metabolites 2023, 13(2), 278; https://doi.org/10.3390/metabo13020278 - 14 Feb 2023
Cited by 4 | Viewed by 1607
Abstract
Gaining a deep understanding of the molecular mechanisms underlying ischemic stroke is necessary to develop treatment alternatives. Ischemic stroke is known to cause a cellular energy imbalance when glucose supply is deprived, enhancing the role for energy production via β-oxidation where acylcarnitines are [...] Read more.
Gaining a deep understanding of the molecular mechanisms underlying ischemic stroke is necessary to develop treatment alternatives. Ischemic stroke is known to cause a cellular energy imbalance when glucose supply is deprived, enhancing the role for energy production via β-oxidation where acylcarnitines are essential for the transportation of fatty acids into the mitochondria. Although traditional bulk analysis methods enable sensitive detection of acylcarnitines, they do not provide information on their abundances in various tissue regions. However, with quantitative mass spectrometry imaging the detected concentrations and spatial distributions of endogenous molecules can be readily obtained in an unbiased way. Here, we use pneumatically assisted nanospray desorption electrospray ionization mass spectrometry imaging (PA nano-DESI MSI) doped with internal standards to study the distributions of acylcarnitines in mouse brain affected by stroke. The internal standards enable quantitative imaging and annotation of endogenous acylcarnitines is achieved by studying fragmentation patterns. We report a significant accumulation of long-chain acylcarnitines due to ischemia in brain tissue of the middle cerebral artery occlusion (MCAO) stroke model. Further, we estimate activities of carnitine transporting enzymes and demonstrate disruptions in the carnitine shuttle system that affects the β-oxidation in the mitochondria. Our results show the importance for quantitative monitoring of metabolite distributions in distinct tissue regions to understand cell compensation mechanisms involved in handling damage caused by stroke. Full article
(This article belongs to the Special Issue Mass Spectrometry: Recent Advancements in In Situ Metabolomics)
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