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Issue 20, 2014
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In Situ metabolic analysis of single plant cells by capillary microsampling and electrospray ionization mass spectrometry with ion mobility separation

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Abstract

Advances in single cell analysis techniques have demonstrated cell-to-cell variability in both homogeneous and heterogeneous cell populations strengthening our understanding of multicellular organisms and individual cell behaviour. However, additional tools are needed for non-targeted metabolic analysis of live single cells in their native environment. Here, we combine capillary microsampling with electrospray ionization (ESI) mass spectrometry (MS) and ion mobility separation (IMS) for the analysis of various single A. thaliana epidermal cell types, including pavement and basal cells, and trichomes. To achieve microsampling of different cell types with distinct morphology, custom-tailored microcapillaries were used to extract the cell contents. To eliminate the isobaric interferences and enhance the ion coverage in single cell analysis, a rapid separation technique, IMS, was introduced that retained ions based on their collision cross sections. For each cell type, the extracted cell material was directly electrosprayed resulting in ∼200 peaks in ESI-MS and ∼400 different ions in ESI-IMS-MS, the latter representing a significantly enhanced coverage. Based on their accurate masses and tandem MS, 23 metabolites and lipids were tentatively identified. Our results indicated that profound metabolic differences existed between the trichome and the other two cell types but differences between pavement and basal cells were hard to discern. The spectra indicated that in all three A. thaliana cell types the phenylpropanoid metabolism pathway had high coverage. In addition, metabolites from the subpathway, sinapic acid ester biosynthesis, were more abundant in single pavement and basal cells, whereas compounds from the kaempferol glycoside biosynthesis pathway were present at significantly higher level in trichomes. Our results demonstrate that capillary microsampling coupled with ESI-IMS-MS captures metabolic differences between A. thaliana epidermal cell types, paving the way for the non-targeted analysis of single plant cells and subcellular compartments.

Graphical abstract: In Situ metabolic analysis of single plant cells by capillary microsampling and electrospray ionization mass spectrometry with ion mobility separation

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Publication details

The article was received on 04 Jun 2014, accepted on 26 Jul 2014 and first published on 28 Jul 2014


Article type: Paper
DOI: 10.1039/C4AN01018C
Citation: Analyst, 2014,139, 5079-5085
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    In Situ metabolic analysis of single plant cells by capillary microsampling and electrospray ionization mass spectrometry with ion mobility separation

    L. Zhang, D. P. Foreman, P. A. Grant, B. Shrestha, S. A. Moody, F. Villiers, J. M. Kwak and A. Vertes, Analyst, 2014, 139, 5079
    DOI: 10.1039/C4AN01018C

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