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Pyrylium Based Derivatization Imaging Mass Spectrometer Revealed the Localization of L-DOPA

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Journal PLoS One
Date 2022 Aug 2
PMID 35917331
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Abstract

Simultaneous imaging of l-dihydroxyphenylalanine (l-DOPA), dopamine (DA) and norepinephrine (NE) in the catecholamine metabolic pathway is particularly useful because l-DOPA is a neurophysiologically important metabolic intermediate. In this study, we found that 2,4,6-trimethylpyrillium tetrafluoroborate (TMPy) can selectively and efficiently react with target catecholamine molecules. Specifically, simultaneous visualization of DA and NE as metabolites of l-DOPA with high steric hinderance was achieved by derivatized-imaging mass spectrometry (IMS). Interestingly, l-DOPA showed strong localization in the brainstem, in contrast to the pattern of DA and NE, which co-localized with tyrosine hydroxylase (TH). In addition, to identify whether the detected molecules were endogenous or exogenous l-DOPA, mice were injected with l-DOPA deuterated in three positions (D3-l-DOPA), which was identifiable by a mass shift of 3Da. TMPy-labeled l-DOPA, DA and NE were detected at m/z 302.1, 258.1 and 274.1, while their D3 versions were detected at 305.0, 261.1 and 277.1 in mouse brain, respectively. l-DOPA and D3-l-DOPA were localized in the BS. DA and NE, and D3-DA and D3-NE, all of which are metabolites of L-DOPA and D3-l-DOPA, were localized in the striatum (STR) and locus coeruleus (LC). These findings suggest a mechanism in the brainstem that allows l-DOPA to accumulate without being metabolized to monoamines downstream of the metabolic pathway.

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References
1.
Tatsuta Y, Tanaka Y, Ikeda A, Matsukawa S, Katano H, Taira S . Nanoparticle-Assisted Laser Desorption/Ionization Mass Spectrometry (Nano-PALDI MS) with Py-Tag for the Analysis of Small Molecules. Mass Spectrom (Tokyo). 2017; 6(Spec Iss 2):S0069. PMC: 5603941. DOI: 10.5702/massspectrometry.S0069. View

2.
Subramanian N, Srimany A, Kanwar J, Kanwar R, Akilandeswari B, Rishi P . Nucleolin-aptamer therapy in retinoblastoma: molecular changes and mass spectrometry-based imaging. Mol Ther Nucleic Acids. 2016; 5(8):e358. PMC: 5023409. DOI: 10.1038/mtna.2016.70. View

3.
Taira S, Sugiura Y, Moritake S, Shimma S, Ichiyanagi Y, Setou M . Nanoparticle-assisted laser desorption/ionization based mass imaging with cellular resolution. Anal Chem. 2008; 80(12):4761-6. DOI: 10.1021/ac800081z. View

4.
Callicott J, Ramsey N, Tallent K, Bertolino A, Knable M, Coppola R . Functional magnetic resonance imaging brain mapping in psychiatry: methodological issues illustrated in a study of working memory in schizophrenia. Neuropsychopharmacology. 1998; 18(3):186-96. DOI: 10.1016/S0893-133X(97)00096-1. View

5.
Shiota M, Shimomura Y, Kotera M, Taira S . Mass spectrometric imaging of localization of fat molecules in water-in-oil emulsions containing semi-solid fat. Food Chem. 2017; 245:1218-1223. DOI: 10.1016/j.foodchem.2017.11.009. View