2019
DOI: 10.1021/acs.analchem.9b04148
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Quantitative Imaging of Proteins in Tissue by Stable Isotope Labeled Mimetic Liquid Extraction Surface Analysis Mass Spectrometry

Abstract: Absolute quantification of proteins in tissue is important for numerous fields of study. Liquid chromatography–mass spectrometry (LC–MS) methods are the norm but typically involve lengthy sample preparation including tissue homogenization, which results in the loss of information relating to spatial distribution. Here, we propose liquid extraction surface analysis (LESA) mass spectrometry (MS) of stable isotope labeled mimetic tissue models for the spatially resolved quantification of intact ubiquitin in rat a… Show more

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Cited by 23 publications
(21 citation statements)
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References 17 publications
(40 reference statements)
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“…The mimetic tissue model is discussed in further detail in the MALDI imaging section. In one instance, the concentration of ubiquitin in brain tissue was determined using a mimetic tissue model [31]. While results agreed with values found in the literature, the > 50% standard deviation across the sample and estimations in the concentration calculation (e.g., weight of rat and mouse brain) inspires low confidence in the absolute concentrations reported.…”
Section: Tissue Profilingsupporting
confidence: 76%
“…The mimetic tissue model is discussed in further detail in the MALDI imaging section. In one instance, the concentration of ubiquitin in brain tissue was determined using a mimetic tissue model [31]. While results agreed with values found in the literature, the > 50% standard deviation across the sample and estimations in the concentration calculation (e.g., weight of rat and mouse brain) inspires low confidence in the absolute concentrations reported.…”
Section: Tissue Profilingsupporting
confidence: 76%
“…For qMSI analysis of intact proteins in tissue, Havlikova et al (2019) constructed a stable isotope labeled mimetic tissue model for the absolute quantification of ubiquitin by spiking C 13 , N 15 ‐labeled ubiquitin into rat and mouse brain sections. Ubiquitin is the low‐molecular weight protein involved in a number of biological processes, such as cell cycle, metabolic regulation, protein degradation and DNA reparation (Kaiser et al, 2011).…”
Section: Quantitative Analysismentioning
confidence: 99%
“…Other ion mobility separation techniques, for example, trapped ion mobility spectrometry (TIMS) [37], may offer similar advantages. A recent study also investigated the ability to derive quantitative measurements of protein concentration directly from tissue during LESA MS experiments [38].…”
Section: Liquid Extraction Surface Analysis (Lesa)mentioning
confidence: 99%