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Bringing SEM and MSI Closer Than Ever Before: Visualizing Aspergillus and Pseudomonas Infection in the Rat Lungs.


ABSTRACT: A procedure for processing frozen rat lung tissue sections for scanning electron microscopy (SEM) from deeply frozen samples initially collected and stored for matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) was developed. The procedure employed slow thawing of the frozen sections while floating on the surface and melting in a fixative solution. After the float-washing step, the sections were dehydrated in a graded ethanol series and dried in a critical point dryer. The SEM generated images with well-preserved structures, allowing for monitoring of bacterial cells and fungal hyphae in the infected tissue. Importantly, the consecutive nonfixed frozen sections were fully compatible with MALDI-MSI, providing molecular biomarker maps of Pseudomonas aeruginosa. The protocol enables bimodal image fusion in the in-house software CycloBranch, as demonstrated by SEM and MALDI-MSI.

SUBMITTER: Jurikova T 

PROVIDER: S-EPMC7711807 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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Bringing SEM and MSI Closer Than Ever Before: Visualizing <i>Aspergillus</i> and <i>Pseudomonas</i> Infection in the Rat Lungs.

Juříková Tereza T   Luptáková Dominika D   Kofroňová Olga O   Škríba Anton A   Novák Jiří J   Marešová Helena H   Palyzová Andrea A   Petřík Miloš M   Havlíček Vladimír V   Benada Oldřich O  

Journal of fungi (Basel, Switzerland) 20201030 4


A procedure for processing frozen rat lung tissue sections for scanning electron microscopy (SEM) from deeply frozen samples initially collected and stored for matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) was developed. The procedure employed slow thawing of the frozen sections while floating on the surface and melting in a fixative solution. After the float-washing step, the sections were dehydrated in a graded ethanol series and dried in a critical point dr  ...[more]

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