= Emerging. More than 5 years before clinical availability. (29.54%)
= Expected to be clinically available in 1 to 4 years. (38.82%)
= Clinically available now. (31.65%)
MSACL 2020 US : Li

MSACL 2020 US Abstract

Keynote Presentation

Topic: Imaging

Podium Presentation in Room 4 on Wednesday at 11:00 (Chair: Richard Drake)

Mapping the Chemical Space of Biological Systems via MALDI Mass Spectrometric Imaging and <i>in situ</i> Molecular Analysis

Lingjun Li (Presenter)
University of Wisconsin - Madison - Madison, WI

Presenter Bio(s): Dr. Lingjun Li is a Vilas Distinguished Achievement Professor and the Charles Melbourne Johnson Distinguished Chair Professor of Pharmaceutical Sciences and Chemistry at the University of Wisconsin-Madison (UW-Madison). Dr. Li received her Ph.D. degree in Chemistry from the University of Illinois at Urbana-Champaign. She then did joint postdoctoral research at the Pacific Northwest National Laboratory and Brandeis University before joining the faculty at UW-Madison. Dr. Li’s research interests include the development of novel mass spectrometry (MS)-based tools such as new isotopic and isobaric labeling strategies that enable hyperplexing for quantitative proteomics and and glycomics, microscale separations, in vivo microdialysis and imaging MS for functional discovery of neuropeptides and protein biomarkers in neurodegenerative diseases.


Mass spectrometric imaging (MSI) provides an attractive opportunity to detect and probe the molecular content of tissues in an anatomical context. This technique creates distribution maps of select compounds without the need for priori knowledge of target analytes. In this presentation, I will describe our efforts and recent progress in mapping and imaging of a wide variety of signaling molecules in several biological systems, highlighting the unique challenges and important roles of MSI in the areas of proteomics, peptidomics, and metabolomics.

Although high resolution accurate mass (HRAM) MSI platform offers unique advantages for mapping small molecule metabolites due to its high resolution and accuracy measurement, typical MALDI-LTQ-Orbitrap platform suffers from limited utility for large peptide and protein analysis due to its maximum m/z 4000. To overcome this challenge, we employed volatile matrices to produce multiply charged ions in MALDI source via laserspray ionization (LSI) and matrix assisted ionization in vacuum (MAIV) techniques on the MALDI Orbitrap platform. These new ionization techniques enabled substantial expansion of the mass range of the instrument and generated improved fragmentation efficiency compared to traditional MALDI-MS. To further enhance the chemical information extracted from in situ MALDI MSI experiments, we report on a multiplex-MSI method, which combines HRAM MSI technology with data dependent acquisition (DDA) tandem MS analysis in a single experiment. To improve the dynamic range and efficiency of in situ DDA, we introduce a novel gas-phase fractionation strategy prior to MS/MS scans, to decrease molecular complexity of tissue samples for enhanced peptidome coverage. In addition, the application of HRAM MALDI MSI to lipid analysis in a restenosis rat model and the utility of a novel subatmospheric pressure (SubAP)/MALDI source coupled with a Q Exactive HF hybrid quadrupole-orbitrap mass spectrometer for in situ imaging of glycans from formalin-fixed paraffin-embedded (FFPE) tissue sections and its translation to clinical cancer tissue microarray analysis will be highlighted. Finally, to further improve the sensitivity of MALDI MSI, a photoactive compound, 2-nitrobenzaldehyde is used to initiate a nanosecond photochemical reaction (nsPCR). This nsPCR strategy enables enhanced neuropeptide identification and visualization from complex tissue samples through on-demand removal of surrounding matrices within nanoseconds. The utility of this new approach for in situ analysis of endogenous biomolecules is evaluated and demonstrated.

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