Essential tactics of tissue preparation and matrix nano-spotting for successful compound imaging mass spectrometry

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• 作者：Á ; kos Vé ; gvá ; ri ; Thomas E. Fehniger ; Lena Gustavsson ; Anna Nilsson ; Per E. André ; n ; Kerstin Kenne ; Johan Nilsson ; Thomas Laurell ; Gyö ; rgy Marko-Varga
• 关键词：Tissue-imaging MALDI-MS ; Microdispenser ; Matrix spotting ; Rat lung ; Tiotropium ; MALDI Orbitrap
• 刊名：Journal of Proteomics
• 出版年：2010
• 出版时间：18 April 2010
• 年：2010
• 卷：73
• 期：6
• 页码：1270-1278
• 全文大小：810 K

文摘

The ultimate goal of MALDI-Imaging Mass Spectrometry (MALDI-IMS) is to achieve spatial localization of analytes in tissue sections down to individual tissue compartments or even at the level of a few cells. With compound tissue imaging, it is possible to track the transportation of an unlabelled, inhaled reference compound within lung tissue, through the application of MALDI-IMS. The procedure for isolation and preparation of lung tissues is found to be crucial in order to preserve the anatomy and structure of the pulmonary compartments.

To avoid delocalization of analytes within lung tissue compartments we have applied an in-house designed nano-spotter, based on a microdispenser mounted on an XY table, of which movement and spotting functionality were fully computer controlled. We demonstrate the usefulness of this platform in lung tissue sections isolated from rodent in vivo model, applied to compound tissue imaging as exemplified with the determination of the spatial distribution of (1α,2β,4β,7β)-7-[(hydroxidi-2-thienylacetyl)oxy]-9,9-dimethyl-3-oxa-9-azoniatricyclo[3.3.1.0^2,4]nonane, also known as tiotropium. We provide details on tissue preparation protocols and sample spotting technology for successful identification of drug in mouse lung tissue by using MALDI-Orbitrap instrumentation.