1
|
Percy AJ, Hardie DB, Jardim A, Yang J, Elliott MH, Zhang S, Mohammed Y, Borchers CH. Multiplexed panel of precisely quantified salivary proteins for biomarker assessment. Proteomics 2016; 17. [PMID: 27538354 DOI: 10.1002/pmic.201600230] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 07/21/2016] [Accepted: 08/15/2016] [Indexed: 12/31/2022]
Abstract
An increasingly popular "absolute" quantitative technique involves the SRM or MRM approach with stable isotope-labeled standards (SIS). Using this approach, many proteins in human plasma/serum have been quantified for biomarker assessment and disease stratification. Due to the complexity of plasma and the invasive nature of its collection, alternative biosamples are currently being explored. Here, we present the broadest panel of multiplexed MRM assays with SIS peptides for saliva proteins developed to date. The validated panel consists of 158 candidate human saliva protein biomarkers, inferred from 244 interference-free peptides. The resulting concentrations were reproducibly quantified over a 6 order-of-magnitude concentration range (from 218 μg/mL to 88 pg/mL; average CVs of 12% over analytical triplicates). All concentrations were determined from reverse standard curves, which were generated using a constant concentration of endogenous material with varying concentrations of spiked-in SIS peptides. The large-scale screening of the soluble and membrane-associated proteins contained within the 158-plex assay could present new opportunities for biomarker assessment and clinical diagnostics.
Collapse
Affiliation(s)
- Andrew J Percy
- University of Victoria-Genome British Columbia Proteomics Centre, Vancouver Island Technology Park, Victoria, BC, Canada
| | - Darryl B Hardie
- University of Victoria-Genome British Columbia Proteomics Centre, Vancouver Island Technology Park, Victoria, BC, Canada
| | - Armando Jardim
- Institute of Parasitology, McGill University, Montreal, QC, Canada
| | - Juncong Yang
- University of Victoria-Genome British Columbia Proteomics Centre, Vancouver Island Technology Park, Victoria, BC, Canada
| | - Monica H Elliott
- University of Victoria-Genome British Columbia Proteomics Centre, Vancouver Island Technology Park, Victoria, BC, Canada
| | - Suping Zhang
- MRM Proteomics, Vancouver Island Technology Park, Victoria, BC, Canada
| | - Yassene Mohammed
- University of Victoria-Genome British Columbia Proteomics Centre, Vancouver Island Technology Park, Victoria, BC, Canada.,Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, the Netherlands
| | - Christoph H Borchers
- University of Victoria-Genome British Columbia Proteomics Centre, Vancouver Island Technology Park, Victoria, BC, Canada.,Department of Biochemistry and Microbiology, University of Victoria, Victoria, BC, Canada
| |
Collapse
|
2
|
Abstract
It was inevitable that as soon as mass spectrometrists were able to tell biologists which proteins were in their samples, the next question would be how much of these proteins were present. This has turned out to be a much more challenging question. In this review, we describe the multiple ways that mass spectrometry has attempted to address this issue, both for relative quantitation and for absolute quantitation of proteins. There is no single method that will work for every problem or for every sample. What we present here is a variety of techniques, with guidelines that we hope will assist the researcher in selecting the most appropriate technique for the particular biological problem that needs to be addressed. We need to emphasize that this is a very active area of proteomics research-new quantitative methods are continuously being introduced and some 'pitfalls' of older methods are just being discovered. However, even though there is no perfect technique--and a better technique may be developed tomorrow--valuable information on biomarkers and pathways can be obtained using these currently available methods.
Collapse
Affiliation(s)
- Monica H Elliott
- University of Victoria Genome BC Proteomics Centre, British Columbia, V8Z 7X8, Canada
| | | | | | | |
Collapse
|
3
|
Abstract
Lipofuscin accumulates with age in a variety of highly metabolically active cells, including the retinal pigment epithelium (RPE) of the eye, where its photoreactivity has the potential for cellular damage. The aim of this study was to assess the phototoxic potential of lipofuscin in the retina. RPE cell cultures were fed isolated lipofuscin granules and maintained in basal medium for 7 d. Control cells lacking granules were cultured in an identical manner. Cultures were either maintained in the dark or exposed to visible light (2.8 mWcm2) at 37 degrees C for up to 48 h. Cells were subsequently assessed for alterations in cell morphology, cell viability, lysosomal stability, lipid peroxidation, and protein oxidation. Exposure of lipofuscin-fed cells to short wavelength visible light (390-550 nm) caused lipid peroxidation (increased levels of malondialdehyde and 4-hydroxy-nonenal), protein oxidation (protein carbonyl formation), loss of lysosomal integrity, cytoplasmic vacuolation, and membrane blebbing culminating in cell death. This effect was wavelength-dependent because light exposure at 550 to 800 nm had no adverse effect on lipofuscin-loaded cells. These results confirm the photoxicity of lipofuscin in a cellular system and implicate it in cell dysfunction such as occurs in ageing and retinal diseases.
Collapse
Affiliation(s)
- S Davies
- Cell and Molecular Biology Unit, Department of Optometry and Vision Sciences, Cardiff University, Cardiff, UK
| | | | | | | | | | | | | | | |
Collapse
|
4
|
|
5
|
Elliott MH, Furneaux RW. Surgical preparation of the pig for in vivo hepatic function studies. Res Vet Sci 1971; 12:594-6. [PMID: 5145358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
6
|
Affiliation(s)
- M H Elliott
- Department of Psychology, Harvard University
| | | |
Collapse
|