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Egbejiogu BC, Donnarumma F, Dong C, Murray KK. Infrared Laser Ablation and Capture of Biological Tissue. Methods Mol Biol 2024; 2817:9-18. [PMID: 38907143 DOI: 10.1007/978-1-0716-3934-4_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/23/2024]
Abstract
Sampling thin tissue sections with cellular precision can be accomplished using laser ablation microsampling for mass spectrometry analysis. In this work, the use of a pulsed mid-infrared (IR) laser for selecting small regions of interest (ROI) in tissue sections for offline liquid chromatography-tandem mass spectrometry (LC-MS/MS) is described. The laser is focused onto the tissue section, which is rastered as the laser is fired. The ablated tissue is captured in a microwell array and processed in situ through reduction, alkylation, and digestion with a low liquid volume workflow. The resulting peptides from areas as small as 0.01 mm2 containing 5 ng of protein are analyzed for protein identification and quantification using offline LC-MS/MS.
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Affiliation(s)
| | | | - Chao Dong
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, USA
| | - Kermit K Murray
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, USA.
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Villacob RA, Egbejiogu BC, Feizi N, Hogan C, Murray KK, Solouki T. Native Mass Spectrometry and Collision-Induced Unfolding of Laser-Ablated Proteins. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2022; 33:2215-2225. [PMID: 36346890 DOI: 10.1021/jasms.2c00184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Infrared laser ablation sample transfer (LAST) was used to collect samples from solid surfaces for mass spectrometry under native spray conditions. Native mass spectrometry was utilized to probe the charge states and collision-induced unfolding (CIU) characteristics of bovine serum albumin (BSA), bovine hemoglobin (BHb), and jack-bean concanavalin A (ConA) via direct injection electrospray, after liquid extraction surface sampling, and after LAST. Each protein was deposited from solution on solid surfaces and laser-ablated for off-line analysis or sampled for online analysis. It was found that the protein ion gas-phase charge-state distributions were comparable for direct infusion, liquid extraction, and laser ablation experiments. Moreover, calculated average collision cross section (CCS) values from direct injection, liquid extraction, and laser ablation experiments were consistent with previously reported literature values. Additionally, an equivalent number of mobility features and conformational turnovers were identified from unfolding pathways from all three methods for all charge states of each protein analyzed in this work. The presented work suggests that laser ablation yields intact proteins (BSA, BHb, and ConA), is compatible with native mass spectrometry, and could be suitable for spatially resolved interrogation of unfolding pathways of proteins.
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Affiliation(s)
| | | | - Neda Feizi
- Baylor University, Waco, Texas 76706, United States
| | - Cole Hogan
- Baylor University, Waco, Texas 76706, United States
| | - Kermit K Murray
- Louisiana State University, Baton Rouge, Louisiana 70803, United States
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Dong C, Richardson LT, Solouki T, Murray KK. Infrared Laser Ablation Microsampling with a Reflective Objective. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2022; 33:463-470. [PMID: 35104132 PMCID: PMC8895455 DOI: 10.1021/jasms.1c00306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 01/19/2022] [Accepted: 01/20/2022] [Indexed: 06/14/2023]
Abstract
A Schwarzschild reflective objective with a numerical aperture of 0.3 and working distance of 10 cm was used for laser ablation sampling of tissue for off-line mass spectrometry. The objective focused the laser to a diameter of 5 μm and produced 10 μm ablation spots on thin ink films and tissue sections. Rat brain tissue sections 50 μm thick were ablated in transmission geometry, and the ablated material was captured in a microcentrifuge tube containing solvent. Proteins from ablated tissue sections were quantified with a Bradford assay, which indicated that approximately 300 ng of protein was captured from a 1 mm2 area of ablated tissue. Areas of tissue ranging from 0.01 to 1 mm2 were ablated and captured for bottom-up proteomics. Proteins were extracted from the captured tissue and digested for liquid chromatography tandem mass spectrometry (LC-MS/MS) analysis for peptide and protein identification.
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Affiliation(s)
- Chao Dong
- Department
of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Luke T. Richardson
- Department
of Chemistry and Biochemistry, Baylor University, Waco, Texas 76706, United States
| | - Touradj Solouki
- Department
of Chemistry and Biochemistry, Baylor University, Waco, Texas 76706, United States
| | - Kermit K. Murray
- Department
of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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He Y, An CZ, Hou XL, Zhong ZT, Li CQ, Chen W, Liu B, Zhao YD. CdTe@CdS quantum dots for labeling and imaging of macrophages in liver frozen section below freezing point. J Mater Chem B 2022; 10:2952-2962. [DOI: 10.1039/d1tb02781f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
CdTe@CdS core-shell quantum dots with different particle sizes are synthesized by aqueous method, and the coating of CdS shell layer improves the quantum yield (36%→59%) and fluorescence stability (37%→77%) of...
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Lawal RO, Richardson LT, Dong C, Donnarumma F, Solouki T, Murray KK. Deep-ultraviolet laser ablation sampling for proteomic analysis of tissue. Anal Chim Acta 2021; 1184:339021. [PMID: 34625253 DOI: 10.1016/j.aca.2021.339021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 07/29/2021] [Accepted: 08/30/2021] [Indexed: 01/22/2023]
Abstract
Deep-ultraviolet laser ablation with a pulsed 193 nm ArF excimer laser was used to remove localized regions from tissue sections from which proteins were extracted for spatially resolved proteomic analysis by liquid chromatography tandem mass spectrometry (LC-MS/MS). The ability to capture intact proteins by ablation at 193 nm wavelength was verified by matrix-assisted laser desorption ionization (MALDI) of the protein standard bovine serum albumin (BSA), which showed that BSA was ablated and captured without fragmentation. A Bradford assay of the ablated and captured proteins indicated 90% efficiency for transfer of the intact protein at a laser fluence of 3 kJ/m2. Rat brain tissue sections mounted on quartz microscope slides and ablated in transmission mode yielded 2 μg protein per mm2 as quantified by the Bradford assay. Tissue areas ranging from 0.06 mm2 to 1 mm2 were ablated and the ejected material was collected for proteomic analysis. Extracted proteins were digested and the resulting peptides were analyzed by LC-MS/MS. The proteins extracted from the ablated areas were identified and the average number of identified proteins ranged from 85 in the 0.06 mm2 area to 2400 in the 1 mm2 area of a 50 μm thick tissue. In comparison to infrared laser ablation of equivalent sampled areas, both the protein mass and number of proteins identified using DUV laser ablation sampling were approximately four times larger.
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Affiliation(s)
- Remilekun O Lawal
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Luke T Richardson
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX, 76706, USA
| | - Chao Dong
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Fabrizio Donnarumma
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Touradj Solouki
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX, 76706, USA
| | - Kermit K Murray
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, USA.
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Wang K, Donnarumma F, Pettit ME, Szot CW, Solouki T, Murray KK. MALDI imaging directed laser ablation tissue microsampling for data independent acquisition proteomics. JOURNAL OF MASS SPECTROMETRY : JMS 2020; 55:e4475. [PMID: 31726477 DOI: 10.1002/jms.4475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 10/25/2019] [Accepted: 11/07/2019] [Indexed: 06/10/2023]
Abstract
A multimodal workflow for mass spectrometry imaging was developed that combines MALDI imaging with protein identification and quantification by liquid chromatography tandem mass spectrometry (LC-MS/MS). Thin tissue sections were analyzed by MALDI imaging, and the regions of interest (ROI) were identified using a smoothing and edge detection procedure. A midinfrared laser at 3-μm wavelength was used to remove the ROI from the brain tissue section after MALDI mass spectrometry imaging (MALDI MSI). The captured material was processed using a single-pot solid-phase-enhanced sample preparation (SP3) method and analyzed by LC-MS/MS using ion mobility (IM) enhanced data independent acquisition (DIA) to identify and quantify proteins; more than 600 proteins were identified. Using a modified database that included isoform and the post-translational modifications chain, loss of the initial methionine, and acetylation, 14 MALDI MSI peaks were identified. Comparison of the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways of the identified proteins was achieved through an evolutionary relationships classification system.
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Affiliation(s)
- Kelin Wang
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, United States
| | - Fabrizio Donnarumma
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, United States
| | - Michael E Pettit
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX, 76706, United States
| | - Carson W Szot
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, United States
| | - Touradj Solouki
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX, 76706, United States
| | - Kermit K Murray
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, United States
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