title: Imaging mass spectrometry with silver nanoparticles reveals the distribution of fatty acids in mouse retinal sections.
abstract: A new approach to the visualization of fatty acids in mouse liver and retinal samples has been developed using silver nanoparticles (AgNPs) in nanoparticle-assisted laser desorption/ionization imaging mass spectrometry (nano-PALDI-IMS) in negative ion mode. So far, IMS analysis has concentrated on main cell components, such as cell membrane phospholipids and cytoskeletal peptides. AgNPs modified with alkylcarboxylate and alkylamine were used for nano-PALDI-IMS to identify fatty acids, such as stearic, oleic, linoleic, arachidonic, and eicosapentaenoic acids, as well as palmitic acid, in mouse liver sections; these fatty acids are not detected using 2,5-dihydroxybenzoic acid (DHB) as a matrix. The limit of detection for the determination of palmitic acid was 50 pmol using nano-PALDI-IMS. The nano-PALDI-IMS method is successfully applied to the reconstruction of the ion images of fatty acids in mouse liver sections. We verified the detection of fatty acids in liver tissue sections of mice by analyzing standard lipid samples, which showed that fatty acids were from free fatty acids and dissociated fatty acids from lipids when irradiated with a laser. Additionally, we applied the proposed method to the identification of fatty acids in mouse retinal tissue sections, which enabled us to learn the six-zonal distribution of fatty acids in different layers of the retina. We believe that the current approach using AgNPs in nano-PALDI-IMS could lead to a new strategy to analyze basic biological mechanisms and several diseases through the distribution of fatty acids.
authors.affiliation: Department of Molecular Anatomy, Molecular Imaging Frontier Research Center, Hamamatsu University School of Medicine, Shizuoka, Japan. thaya@hama-med.ac.jp
authors.forename: Takahiro
authors.initials: T
authors.lastname: Hayasaka
authors.forename: Naoko
authors.initials: N
authors.lastname: Goto-Inoue
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Zaima
authors.forename: Kamlesh
authors.initials: K
authors.lastname: Shrivas
authors.forename: Yukiyasu
authors.initials: Y
authors.lastname: Kashiwagi
authors.forename: Mari
authors.initials: M
authors.lastname: Yamamoto
authors.forename: Masami
authors.initials: M
authors.lastname: Nakamoto
authors.forename: Mitsutoshi
authors.initials: M
authors.lastname: Setou
mesh_terms: D000818:Animals; D005227:Fatty Acids / Q000737:chemistry* / Q000378:metabolism; D006651:Histocytochemistry; D008099:Liver / Q000737:chemistry / Q000378:metabolism; D008297:Male; D053768:Metal Nanoparticles / Q000737:chemistry*; D051379:Mice; D008810:Mice, Inbred C57BL; D012160:Retina / Q000737:chemistry* / Q000378:metabolism; D012680:Sensitivity and Specificity; D012834:Silver / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*
chemical_list: D005227:Fatty Acids; D012834:Silver
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