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Smith H, Giulivi C. Starch treatment improves the salivary proteome for subject identification purposes. Forensic Sci Med Pathol 2024; 20:117-128. [PMID: 37084127 PMCID: PMC10944386 DOI: 10.1007/s12024-023-00629-y] [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] [Accepted: 04/04/2023] [Indexed: 04/22/2023]
Abstract
Identification of subjects, including perpetrators, is one of the most crucial goals of forensic science. Saliva is among the most common biological fluids found at crime scenes, containing identifiable components. DNA has been the most prominent identifier to date, but its analysis can be complex due to low DNA yields and issues preserving its integrity at the crime scene. Proteins are emerging as viable candidates for subject identification. Previous work has shown that the salivary proteome of the least-abundant proteins may be helpful for subject identification, but more optimized techniques are needed. Among them is removing the most abundant proteins, such as salivary α-amylase. Starch treatment of saliva samples elicited the removal of this enzyme and that of glycosylated, low-molecular-weight proteins, proteases, and immunoglobulins, resulting in a saliva proteome profile enriched with a subset of proteins, allowing a more reliable and nuanced subject identification.
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Affiliation(s)
- Hannah Smith
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California Davis, Davis, CA, USA
| | - Cecilia Giulivi
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California Davis, Davis, CA, USA.
- MIND Institute, University of California at Davis Medical Center, Sacramento, CA, USA.
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2
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Romano F, Franco F, Corana M, Abbadessa G, Di Scipio F, Pergolizzi B, Castrignano C, Aimetti M, Berta GN. Cystatin SN (CST1) as a Novel Salivary Biomarker of Periodontitis. Int J Mol Sci 2023; 24:13834. [PMID: 37762137 PMCID: PMC10530756 DOI: 10.3390/ijms241813834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Revised: 08/31/2023] [Accepted: 09/06/2023] [Indexed: 09/29/2023] Open
Abstract
Identification of biomarkers could help in assessing periodontal health status and monitoring treatment outcomes. Therefore, the aim of this cross-sectional study was to identify potential innovative salivary biomarkers for the diagnosis of periodontitis using an untargeted proteomic approach. Forty-five healthy non-smoker participants diagnosed as having periodontally healthy conditions (H), severe periodontitis (P), and healthy but reduced periodontium after active periodontal treatment (T) were consecutively enrolled (15 per each group) in the study. A higher number of spots were identified in the proteome of unstimulated whole saliva collected from H and T subjects compared with P group, mainly within the range of 8-40 kDa. Protein spots of interest were analysed by MALDI-TOF-MS, allowing the identification of cystatin SN (CST1) isoform, as confirmed by Western blot. CST1 was markedly expressed in the H group, while it was absent in most P samples (p < 0.001). Interestingly, a distinct CST1 expression was observed in saliva from T patients. CST1 was negatively correlated with the percentage of pathological sites (p < 0.001) and was effective in discriminating active periodontitis from healthy periodontal status (whether H or T). Therefore, salivary CST1 may be a promising non-invasive biomarker for periodontal disease diagnosis and monitoring.
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Affiliation(s)
- Federica Romano
- Department of Surgical Sciences, C.I.R. Dental School, Section of Periodontology, University of Turin, 10126 Turin, Italy; (F.R.); (M.C.); (F.D.S.); (M.A.)
| | - Francesco Franco
- Department of Clinical and Biological Sciences, University of Turin, 10043 Orbassano, Italy; (F.F.); (G.A.); (B.P.); (C.C.)
| | - Matteo Corana
- Department of Surgical Sciences, C.I.R. Dental School, Section of Periodontology, University of Turin, 10126 Turin, Italy; (F.R.); (M.C.); (F.D.S.); (M.A.)
| | - Giuliana Abbadessa
- Department of Clinical and Biological Sciences, University of Turin, 10043 Orbassano, Italy; (F.F.); (G.A.); (B.P.); (C.C.)
| | - Federica Di Scipio
- Department of Surgical Sciences, C.I.R. Dental School, Section of Periodontology, University of Turin, 10126 Turin, Italy; (F.R.); (M.C.); (F.D.S.); (M.A.)
| | - Barbara Pergolizzi
- Department of Clinical and Biological Sciences, University of Turin, 10043 Orbassano, Italy; (F.F.); (G.A.); (B.P.); (C.C.)
| | - Chiara Castrignano
- Department of Clinical and Biological Sciences, University of Turin, 10043 Orbassano, Italy; (F.F.); (G.A.); (B.P.); (C.C.)
| | - Mario Aimetti
- Department of Surgical Sciences, C.I.R. Dental School, Section of Periodontology, University of Turin, 10126 Turin, Italy; (F.R.); (M.C.); (F.D.S.); (M.A.)
| | - Giovanni N. Berta
- Department of Clinical and Biological Sciences, University of Turin, 10043 Orbassano, Italy; (F.F.); (G.A.); (B.P.); (C.C.)
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3
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Messana I, Manconi B, Cabras T, Boroumand M, Sanna MT, Iavarone F, Olianas A, Desiderio C, Rossetti DV, Vincenzoni F, Contini C, Guadalupi G, Fiorita A, Faa G, Castagnola M. The Post-Translational Modifications of Human Salivary Peptides and Proteins Evidenced by Top-Down Platforms. Int J Mol Sci 2023; 24:12776. [PMID: 37628956 PMCID: PMC10454625 DOI: 10.3390/ijms241612776] [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] [Received: 06/19/2023] [Revised: 08/05/2023] [Accepted: 08/08/2023] [Indexed: 08/27/2023] Open
Abstract
In this review, we extensively describe the main post-translational modifications that give rise to the multiple proteoforms characterized to date in the human salivary proteome and their potential role. Most of the data reported were obtained by our group in over twenty-five years of research carried out on human saliva mainly by applying a top-down strategy. In the beginning, we describe the products generated by proteolytic cleavages, which can occur before and after secretion. In this section, the most relevant families of salivary proteins are also described. Next, we report the current information concerning the human salivary phospho-proteome and the limited news available on sulfo-proteomes. Three sections are dedicated to the description of glycation and enzymatic glycosylation. Citrullination and N- and C-terminal post-translational modifications (PTMs) and miscellaneous other modifications are described in the last two sections. Results highlighting the variation in the level of some proteoforms in local or systemic pathologies are also reviewed throughout the sections of the manuscript to underline the impact and relevance of this information for the development of new diagnostic biomarkers useful in clinical practice.
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Affiliation(s)
- Irene Messana
- Istituto di Scienze e Tecnologie Chimiche “Giulio Natta”, Consiglio Nazionale delle Ricerche, 00168 Rome, Italy; (I.M.); (C.D.); (D.V.R.)
| | - Barbara Manconi
- Department of Life and Environmental Sciences, University of Cagliari, 09124 Cagliari, Italy; (B.M.); (M.T.S.); (A.O.); (C.C.); (G.G.)
| | - Tiziana Cabras
- Department of Life and Environmental Sciences, University of Cagliari, 09124 Cagliari, Italy; (B.M.); (M.T.S.); (A.O.); (C.C.); (G.G.)
| | | | - Maria Teresa Sanna
- Department of Life and Environmental Sciences, University of Cagliari, 09124 Cagliari, Italy; (B.M.); (M.T.S.); (A.O.); (C.C.); (G.G.)
| | - Federica Iavarone
- Dipartimento di Scienze Biotecnologiche di Base, Cliniche Intensivologiche e Perioperatorie, Università Cattolica del Sacro Cuore, 00168 Rome, Italy; (F.I.); (F.V.)
- Fondazione Policlinico Universitario A. Gemelli Fondazione IRCCS, 00168 Rome, Italy;
| | - Alessandra Olianas
- Department of Life and Environmental Sciences, University of Cagliari, 09124 Cagliari, Italy; (B.M.); (M.T.S.); (A.O.); (C.C.); (G.G.)
| | - Claudia Desiderio
- Istituto di Scienze e Tecnologie Chimiche “Giulio Natta”, Consiglio Nazionale delle Ricerche, 00168 Rome, Italy; (I.M.); (C.D.); (D.V.R.)
| | - Diana Valeria Rossetti
- Istituto di Scienze e Tecnologie Chimiche “Giulio Natta”, Consiglio Nazionale delle Ricerche, 00168 Rome, Italy; (I.M.); (C.D.); (D.V.R.)
| | - Federica Vincenzoni
- Dipartimento di Scienze Biotecnologiche di Base, Cliniche Intensivologiche e Perioperatorie, Università Cattolica del Sacro Cuore, 00168 Rome, Italy; (F.I.); (F.V.)
- Fondazione Policlinico Universitario A. Gemelli Fondazione IRCCS, 00168 Rome, Italy;
| | - Cristina Contini
- Department of Life and Environmental Sciences, University of Cagliari, 09124 Cagliari, Italy; (B.M.); (M.T.S.); (A.O.); (C.C.); (G.G.)
| | - Giulia Guadalupi
- Department of Life and Environmental Sciences, University of Cagliari, 09124 Cagliari, Italy; (B.M.); (M.T.S.); (A.O.); (C.C.); (G.G.)
| | - Antonella Fiorita
- Fondazione Policlinico Universitario A. Gemelli Fondazione IRCCS, 00168 Rome, Italy;
- Dipartimento di Scienze dell’Invecchiamento, Neurologiche, Ortopediche e della Testa e del Collo, Università Cattolica del Sacro Cuore, 00168 Rome, Italy
| | - Gavino Faa
- Unit of Pathology, Department of Medical Sciences and Public Health, University of Cagliari, 09124 Cagliari, Italy;
- Department of Biology, College of Science and Technology, Temple University, Philadelphia, PA 19122, USA
| | - Massimo Castagnola
- Proteomics Laboratory, European Center for Brain Research, (IRCCS) Santa Lucia Foundation, 00168 Rome, Italy;
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Abstract
The use of saliva as a diagnostic biofluid has been increasing in recent years, thanks to the identification and validation of new biomarkers and improvements in test accuracy, sensitivity, and precision that enable the development of new noninvasive and cost-effective devices. However, the lack of standardized methods for sample collection, treatment, and storage contribute to the overall variability and lack of reproducibility across analytical evaluations. Furthermore, the instability of salivary biomarkers after sample collection hinders their translation into commercially available technologies for noninvasive monitoring of saliva in home settings. The present review aims to highlight the status of research on the challenges of collecting and using diagnostic salivary samples, emphasizing the methodologies used to preserve relevant proteins, hormones, genomic, and transcriptomic biomarkers during sample handling and analysis.
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Affiliation(s)
- Luciana d'Amone
- Silklab, Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155, United States
| | - Giusy Matzeu
- Silklab, Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155, United States
| | - Fiorenzo G Omenetto
- Silklab, Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155, United States.,Department of Electrical and Computer Engineering, Tufts University, Medford, Massachusetts 02155, United States.,Department of Physics, Tufts University, Medford, Massachusetts 02155, United States.,Laboratory for Living Devices, Tufts University, Medford, Massachusetts 02155, United States
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5
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Manconi B, Liori B, Cabras T, Vincenzoni F, Iavarone F, Castagnola M, Messana I, Olianas A. Salivary Cystatins: Exploring New Post-Translational Modifications and Polymorphisms by Top-Down High-Resolution Mass Spectrometry. J Proteome Res 2018; 16:4196-4207. [PMID: 29019242 DOI: 10.1021/acs.jproteome.7b00567] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Cystatins are a complex family of cysteine peptidase inhibitors. In the present study, various proteoforms of cystatin A, cystatin B, cystatin S, cystatin SN, and cystatin SA were detected in the acid-soluble fraction of human saliva and characterized by a top-down HPLC-ESI-MS approach. Proteoforms of cystatin D were also detected and characterized by an integrated top-down and bottom-up strategy. The proteoforms derive from coding sequence polymorphisms and post-translational modifications, in particular, phosphorylation, N-terminal processing, and oxidation. This study increases the current knowledge of salivary cystatin proteoforms and provides the basis to evaluate possible qualitative/quantitative variations of these proteoforms in different pathological states and reveal new potential salivary biomarkers of disease. Data are available via ProteomeXchange with identifier PXD007170.
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Affiliation(s)
- Barbara Manconi
- Department of Life and Environmental Sciences, Biomedical Section, University of Cagliari , Monserrato Campus, 09042 Monserrato, Cagliari, Italy
| | - Barbara Liori
- Department of Life and Environmental Sciences, Biomedical Section, University of Cagliari , Monserrato Campus, 09042 Monserrato, Cagliari, Italy
| | - Tiziana Cabras
- Department of Life and Environmental Sciences, Biomedical Section, University of Cagliari , Monserrato Campus, 09042 Monserrato, Cagliari, Italy
| | - Federica Vincenzoni
- Biochemistry and Clinical Biochemistry Institute, Medicine Faculty, Catholic University of Rome , L.go F. Vito 1, 00168 Rome, Italy
| | - Federica Iavarone
- Biochemistry and Clinical Biochemistry Institute, Medicine Faculty, Catholic University of Rome , L.go F. Vito 1, 00168 Rome, Italy
| | - Massimo Castagnola
- Biochemistry and Clinical Biochemistry Institute, Medicine Faculty, Catholic University of Rome , L.go F. Vito 1, 00168 Rome, Italy.,Institute of Chemistry of the Molecular Recognition CNR , L.go F. Vito 1, 00168 Rome, Italy
| | - Irene Messana
- Biochemistry and Clinical Biochemistry Institute, Medicine Faculty, Catholic University of Rome , L.go F. Vito 1, 00168 Rome, Italy.,Institute of Chemistry of the Molecular Recognition CNR , L.go F. Vito 1, 00168 Rome, Italy
| | - Alessandra Olianas
- Department of Life and Environmental Sciences, Biomedical Section, University of Cagliari , Monserrato Campus, 09042 Monserrato, Cagliari, Italy
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6
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Top-down HPLC-ESI-MS proteomic analysis of saliva of edentulous subjects evidenced high levels of cystatin A, cystatin B and SPRR3. Arch Oral Biol 2017; 77:68-74. [PMID: 28178587 DOI: 10.1016/j.archoralbio.2017.01.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 01/23/2017] [Accepted: 01/29/2017] [Indexed: 01/20/2023]
Abstract
OBJECTIVE This study aims to analyze the salivary peptidome/proteome of edentulous subject with respect to dentate control subjects. DESIGN Unstimulated whole saliva, collected from 11 edentulous subjects (age 60-76 years) and 11 dentate age-matched control subjects, was immediately treated with 0.2% aqueous trifluoroacetic acid and the acidic soluble fraction analyzed by High Performace Liquid Chromatography-Mass Spectrometry. The relative abundance of the salivary peptides/proteins was determined by measuring the area of the High Performace Liquid Chromatography-Mass Spectrometry eXtracted Ion Current peaks which is linearly proportional to peptide/protein concentration under identical experimental conditions. Levels of salivary peptides/proteins in the two groups were compared by the nonparametric Mann-Whitney test to evidence statistically significant differences. RESULTS Levels of cystatin A, S-glutathionylated, S-cystenylated, S-S dimer derivatives of cystatin B and S-glutathionylated derivative of SPRR3, were found significantly higher in edentulous subjects with respect to dentate controls. The major peptides and proteins typically deriving from salivary glands did not show any statistically significant differences. CONCLUSIONS Cystatin A, S-glutathionylated, S-cystenylated, S-S dimer derivatives of cystatin B and S-glutathionylated derivative of SPRR3, which are mainly of intracellular origin and represent the major constituents of the cornified cell envelope are a clue of inflammation of mucosal epithelia.
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7
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Marvin RK, Saepoo MB, Ye S, White DB, Liu R, Hensley K, Rega P, Kazan V, Giovannucci DR, Isailovic D. Salivary protein changes in response to acute stress in medical residents performing advanced clinical simulations: a pilot proteomics study. Biomarkers 2017; 22:372-382. [PMID: 28055279 DOI: 10.1080/1354750x.2017.1279215] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
CONTEXT Quantitative changes of salivary proteins due to acute stress were detected. OBJECTIVE To explore protein markers of stress in saliva of eight medical residents who performed emergency medicine simulations. MATERIALS AND METHODS Saliva was collected before the simulations, after the simulations, and following morning upon waking. Proteins were separated by sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE), identified by mass spectrometry (MS), and relatively quantified by densitometry. RESULTS Salivary alpha-amylase and S-type cystatins significantly increased, while the ∼26 kDa and low-molecular weight (MW) (<10 kDa) SDS-PAGE bands exhibited changes after stress. DISCUSSION AND CONCLUSION Alpha-amylase and cystatins are potential salivary markers of acute stress, but further validation should be performed using larger sample populations.
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Affiliation(s)
- Rachel K Marvin
- a Department of Chemistry and Biochemistry , University of Toledo , Toledo , OH , USA
| | | | - Simiao Ye
- c Department of Mathematics and Statistics , University of Toledo , Toledo , OH , USA
| | - Donald B White
- c Department of Mathematics and Statistics , University of Toledo , Toledo , OH , USA
| | - Rong Liu
- c Department of Mathematics and Statistics , University of Toledo , Toledo , OH , USA
| | - Kenneth Hensley
- d Department of Pathology , University of Toledo, Toledo , OH, USA
| | - Paul Rega
- e Department of Emergency Medicine , University of Toledo , Toledo , OH , USA
| | - Viviane Kazan
- e Department of Emergency Medicine , University of Toledo , Toledo , OH , USA
| | | | - Dragan Isailovic
- a Department of Chemistry and Biochemistry , University of Toledo , Toledo , OH , USA
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8
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Top-down analytical platforms for the characterization of the human salivary proteome. Bioanalysis 2014; 6:563-81. [PMID: 24568357 DOI: 10.4155/bio.13.349] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Comprehensive analysis and characterization of the human salivary proteome is an important step towards the possible use of saliva for diagnostic and prognostic purposes. The contribution of the different sources to whole saliva, and the evaluation of individual variability and physiological modifications have been investigated by top-down proteomic approaches, disclosing the faceted and complex profile of the human salivary proteome. All this information is essential to develop saliva protein biomarkers. In this Review the major results obtained in the field by top-down platforms, and the improvements required to allow a more complete picture, will be discussed.
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Amado F, Lobo MJC, Domingues P, Duarte JA, Vitorino R. Salivary peptidomics. Expert Rev Proteomics 2014; 7:709-21. [DOI: 10.1586/epr.10.48] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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10
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Melino S, Santone C, Di Nardo P, Sarkar B. Histatins: salivary peptides with copper(II)- and zinc(II)-binding motifs. FEBS J 2013; 281:657-72. [DOI: 10.1111/febs.12612] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Revised: 11/07/2013] [Accepted: 11/11/2013] [Indexed: 02/03/2023]
Affiliation(s)
- Sonia Melino
- Department of Chemical Sciences and Technologies; University of Rome Tor Vergata; Italy
| | - Celeste Santone
- Department of Chemical Sciences and Technologies; University of Rome Tor Vergata; Italy
| | - Paolo Di Nardo
- Department of Medical Sciences and Translational Medicine; University of Rome Tor Vergata; Italy
| | - Bibudhendra Sarkar
- Department of Molecular Structure and Function; The Hospital for Sick Children; University of Toronto; Ontario Canada
- Department of Biochemistry; University of Toronto; Ontario Canada
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11
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Cabras T, Pisano E, Montaldo C, Giuca MR, Iavarone F, Zampino G, Castagnola M, Messana I. Significant modifications of the salivary proteome potentially associated with complications of Down syndrome revealed by top-down proteomics. Mol Cell Proteomics 2013; 12:1844-52. [PMID: 23533003 DOI: 10.1074/mcp.m112.026708] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
People with Down syndrome, a frequent genetic disorder in humans, have increased risk of health problems associated with this condition. One clinical feature of Down syndrome is the increased prevalence and severity of periodontal disease in comparison with the general population. Because saliva plays an important role in maintaining oral health, in the present study the salivary proteome of Down syndrome subjects was investigated to explore modifications with respect to healthy subjects. Whole saliva of 36 Down syndrome subjects, divided in the age groups 10-17 yr and 18-50 yr, was analyzed by a top-down proteomic approach, based on the high performance liquid chromatography-electrospray ionization-MS analysis of the intact proteins and peptides, and the qualitative and quantitative profiles were compared with sex- and age-matched control groups. The results showed the following interesting features: 1) as opposed to controls, in Down syndrome subjects the concentration of the major salivary proteins of gland origin did not increase with age; as a consequence concentration of acidic proline rich proteins and S cystatins were found significantly reduced in older Down syndrome subjects with respect to matched controls; 2) levels of the antimicrobial α-defensins 1 and 2 and histatins 3 and 5 were significantly increased in whole saliva of older Down syndrome subjects with respect to controls; 3) S100A7, S100A8, and S100A12 levels were significantly increased in whole saliva of Down syndrome subjects in comparison with controls. The increased level of S100A7 and S100A12 may be of particular interest as a biomarker of early onset Alzheimer's disease, which is frequently associated with Down syndrome.
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Affiliation(s)
- Tiziana Cabras
- Dipartimento di Scienze della Vita e dell'Ambiente, Università di Cagliari, Monserrato (CA), Italy.
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12
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Castagnola M, Cabras T, Iavarone F, Vincenzoni F, Vitali A, Pisano E, Nemolato S, Scarano E, Fiorita A, Vento G, Tirone C, Romagnoli C, Cordaro M, Paludetti G, Faa G, Messana I. Top-down platform for deciphering the human salivary proteome. J Matern Fetal Neonatal Med 2013; 25:27-43. [PMID: 23025766 DOI: 10.3109/14767058.2012.714647] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Proteomic platforms can be classified in bottom-up strategies, which analyze the sample after proteolytic digestion, and top-down strategies, which analyze the intact naturally occurring proteome. Bottom-up platforms are high-throughput because they can investigate a large number of proteins, regardless of their dimension. Nonetheless, information on post-translational modifications (PTMs) can be lost, especially those regarding naturally occurring cleavages and alternative splicing. Top-down platforms cannot cover vast proteomes, however, they can disclose subtle structural variations occurring during protein maturation and allow label-free relative quantifications in an unlimited number of samples. A repertoire of 256 masses belonging to naturally occurring proteins and peptides consistently detected by RP-HPLC-ESI-MS analysis of the acidic soluble fraction of human whole saliva is presented in this study. Of them, 233 have been identified, while 23 are still pending for the definitive characterization. The present review reports average and mono-isotopic masses of the peptides and proteins detected, RP-HPLC elution times, PTMs, origin and quali-quantitative variations observed in several physiological and pathological conditions. The information reported can be a reference for users of top-down RP-HPLC-ESI-MS proteomic platforms applied to the study of the human salivary proteome as well as of other human bodily fluids.
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Affiliation(s)
- Massimo Castagnola
- Istituto di Biochimica e Biochimica Clinica, Facoltà di Medicina, Università Cattolica, Largo Francesco Vito 1, Rome, Italy.
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13
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Cabras T, Melis M, Castagnola M, Padiglia A, Tepper BJ, Messana I, Tomassini Barbarossa I. Responsiveness to 6-n-propylthiouracil (PROP) is associated with salivary levels of two specific basic proline-rich proteins in humans. PLoS One 2012; 7:e30962. [PMID: 22312435 PMCID: PMC3270025 DOI: 10.1371/journal.pone.0030962] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Accepted: 12/30/2011] [Indexed: 01/25/2023] Open
Abstract
Thiourea tasting can be predictive of individual differences in bitter taste responses, general food preferences and eating behavior, and could be correlated with saliva chemical composition. We investigated the possible relationship between PROP bitter taste responsiveness and the salivary proteome in subjects genotyped for TAS2R38 and gustin gene polymorphisms. Taste perception intensity evoked by PROP and NaCl solutions was measured in sixty-three volunteers (21 males, 42 females, age 25±3 y) to establish their PROP taster status, and 24 PROP super-tasters and 21 nontasters were selected to participate in the study. TAS2R38 and gustin gene molecular analysis were performed using PCR techniques. Qualitative and quantitative determination of salivary proteins was performed by HPLC-ESI-MS before and after PROP taste stimulation. PROP super-tastings was strongly associated with the 'taster' variant (PAV haplotype) of TAS2R38 and the A allele of rs2274333 polymorphism in the gustin gene and nontasting was associated with the minor alleles at both loci. ANOVA revealed that basal levels of II-2 and Ps-1 proteins, belonging to the basic proline-rich protein (bPRPs) family, were significantly higher in PROP super-taster than in nontaster un-stimulated saliva, and that PROP stimulation elicited a rapid increase in the levels of these same proteins only in PROP super-taster saliva. These data show for the first time that responsiveness to PROP is associated with salivary levels of II-2 peptide and Ps-1 protein, which are products of the PRB1 gene. These findings suggest that PRB1, in addition to TAS2R38 and gustin, could contribute to individual differences in thiourea sensitivity, and the expression of the PROP phenotype as a complex genetic trait.
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Affiliation(s)
- Tiziana Cabras
- Department of Life and Environment Sciences, Macrosection of Biomedicine, University of Cagliari, Monserrato, Cagliari, Italy
| | - Melania Melis
- Department of Biomedical Sciences, University of Cagliari, Monserrato, Cagliari, Italy
| | - Massimo Castagnola
- Institute of Biochemistry and Clinical Biochemistry, Catholic University, Rome, Italy
| | - Alessandra Padiglia
- Department of Life and Environment Sciences, Macrosection of Biomedicine, University of Cagliari, Monserrato, Cagliari, Italy
| | - Beverly J. Tepper
- Department of Food Science, School of Environmental and Biological Sciences, Rutgers University, New Brunswick, New Jersey, United States of America
| | - Irene Messana
- Department of Life and Environment Sciences, Macrosection of Biomedicine, University of Cagliari, Monserrato, Cagliari, Italy
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14
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de Jong EP, van Riper SK, Koopmeiners JS, Carlis JV, Griffin TJ. Sample collection and handling considerations for peptidomic studies in whole saliva; implications for biomarker discovery. Clin Chim Acta 2011; 412:2284-8. [PMID: 21889499 PMCID: PMC3196990 DOI: 10.1016/j.cca.2011.08.023] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Revised: 08/16/2011] [Accepted: 08/17/2011] [Indexed: 01/15/2023]
Abstract
BACKGROUND Proteomic studies in saliva have demonstrated its potential as a diagnostic biofluid, however the salivary peptidome is less studied. Here we study the effects of several sample collection and handling factors on salivary peptide abundance levels. METHODS Salivary peptides were isolated using an ultrafiltration device and analyzed by tandem mass spectrometry. A panel of 41 peptides common after various treatments were quantified and normalized. We evaluated the effects of freezing rate of the samples, nutritional status of the donors (fed vs. fasted), and room-temperature sample degradation on peptide abundance levels. Repeatability of our sample processing method and our instrumental analysis method were investigated. RESULTS Increased sample freezing rate produced higher levels of peptides. Donor nutritional status had no influence on the levels of measured peptides. No significant difference was detected in donors' saliva following 5, 10 and 15 min of room-temperature degradation. Sample processing and instrumental variability were relatively small, with median CVs of 9.6 and 6.6. CONCLUSIONS Peptide abundance levels in saliva are rather forgiving towards variations in sample handling and donor nutritional status. Differences in freezing methods may affect peptide abundance, so consistency in freezing samples is preferred. Our results are valuable for standardizing sample collection and handling methods for peptidomic-based biomarker studies in saliva.
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Affiliation(s)
- Ebbing P. de Jong
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota; 321 Church St. SE, 6-155 Jackson Hall; Minneapolis, MN 55455
| | - Susan K. van Riper
- Biomedical Informatics and Computational Biology, University of Minnesota; 321 Church St. SE, 6-155 Jackson Hall; Minneapolis, MN 55455
| | - Joseph S. Koopmeiners
- Department of Biostatistics, University of Minnesota; 321 Church St. SE, 6-155 Jackson Hall; Minneapolis, MN 55455
| | - John V. Carlis
- Biomedical Informatics and Computational Biology, University of Minnesota; 321 Church St. SE, 6-155 Jackson Hall; Minneapolis, MN 55455
| | - Timothy J. Griffin
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota; 321 Church St. SE, 6-155 Jackson Hall; Minneapolis, MN 55455
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15
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Castagnola M, Inzitari R, Fanali C, Iavarone F, Vitali A, Desiderio C, Vento G, Tirone C, Romagnoli C, Cabras T, Manconi B, Sanna MT, Boi R, Pisano E, Olianas A, Pellegrini M, Nemolato S, Heizmann CW, Faa G, Messana I. The surprising composition of the salivary proteome of preterm human newborn. Mol Cell Proteomics 2010; 10:M110.003467. [PMID: 20943598 DOI: 10.1074/mcp.m110.003467] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Saliva is a body fluid of a unique composition devoted to protect the mouth cavity and the digestive tract. Our high performance liquid chromatography (HPLC)-electrospray ionization-MS analysis of the acidic soluble fraction of saliva from preterm human newborn surprisingly revealed more than 40 protein masses often undetected in adult saliva. We were able to identify the following proteins: stefin A and stefin B, S100A7 (two isoforms), S100A8, S100A9 (four isoforms), S100A11, S100A12, small proline-rich protein 3 (two isoforms), lysozyme C, thymosins β(4) and β(10), antileukoproteinase, histone H1c, and α and γ globins. The average mass value reported in international data banks was often incongruent with our experimental results mostly because of post-translational modifications of the proteins, e.g. acetylation of the N-terminal residue. A quantitative label-free MS analysis showed protein levels altered in relation to the postconceptional age and suggested coordinate and hierarchical functions for these proteins during development. In summary, this study shows for the first time that analysis of these proteins in saliva of preterm newborns might represent a noninvasive way to obtain precious information of the molecular mechanisms of development of human fetal oral structures.
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Affiliation(s)
- Massimo Castagnola
- Istituto di Biochimica e di Biochimica Clinica, Università Cattolica, Rome, Italy.
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16
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Cabras T, Pisano E, Mastinu A, Denotti G, Pusceddu PP, Inzitari R, Fanali C, Nemolato S, Castagnola M, Messana I. Alterations of the salivary secretory peptidome profile in children affected by type 1 diabetes. Mol Cell Proteomics 2010; 9:2099-108. [PMID: 20585025 DOI: 10.1074/mcp.m110.001057] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The acidic soluble fraction of whole saliva of type 1 diabetic children was analyzed by reversed phase (RP)(1)-HPLC-ESI-MS and compared with that of sex- and age-matched control subjects. Salivary acidic proline-rich phosphoproteins (aPRP), histatins, α-defensins, salivary cystatins, statherin, proline-rich peptide P-B (P-B), beta-thymosins, S100A8 and S100A9*(S100A9* corresponds to S100A9 vairant lacking the first four amino acids), as well some naturally occurring peptides derived from salivary acidic proline-rich phosphoproteins, histatins, statherin, and P-B peptide, were detected and quantified on the basis of the extracted ion current peak area. The level of phosphorylation of salivary acidic proline-rich phosphoproteins, histatin-1 (Hst-1), statherin and S100A9* and the percentage of truncated forms of salivary acidic proline-rich phosphoproteins was also determined in the two groups. The study revealed that statherin, proline-rich peptide P-B, P-C peptide, and histatins, were significantly less concentrated in saliva of diabetic subjects than in controls, while concentration of α-defensins 1, 2 and 4 and S100A9* was higher. The low concentration of P-C peptide was paralleled by high levels of some of its fragments. On the whole, the study highlighted the severe impairment of the repertoire of peptides involved in the safeguard of the oral cavity in children who have diabetes, as well as an higher concentration of the proinflammatory mediator S100A9* with respect to healthy children.
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Affiliation(s)
- Tiziana Cabras
- Dipartimento di Scienze Applicate ai Biosistemi, Università di Cagliari, Cagliari, Italy
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17
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Ryan CM, Souda P, Halgand F, Wong DT, Loo JA, Faull KF, Whitelegge JP. Confident assignment of intact mass tags to human salivary cystatins using top-down Fourier-transform ion cyclotron resonance mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2010; 21:908-17. [PMID: 20189825 PMCID: PMC2873128 DOI: 10.1016/j.jasms.2010.01.025] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2009] [Revised: 01/22/2010] [Accepted: 01/26/2010] [Indexed: 05/12/2023]
Abstract
A hybrid linear ion-trap Fourier-transform ion cyclotron resonance mass spectrometer was used for top-down characterization of the abundant human salivary cystatins, including S, S1, S2, SA, SN, C, and D, using collisionally activated dissociation (CAD) after chromatographic purification of the native, disulfide intact proteins. Post-translational modifications and protein sequence polymorphisms arising from single nucleotide polymorphisms (SNPs) were assigned from precursor and product ion masses at a tolerance of 10 ppm, allowing confident identification of individual intact mass tags. Cystatins S, S1, S2, SA, and SN were cleaved of a N-terminal 20 amino acid signal peptide and cystatin C a 26-residue peptide, to yield a generally conserved N-terminus. In contrast, cystatin D isoforms with 24 and 28 amino acid residue N-terminal truncations were found such that their N-termini were not conserved. Cystatin S1 was phosphorylated at Ser3, while S2 was phosphorylated at Ser1 and Ser3, in agreement with previous work. Both cystatin D isoforms carried the polymorphism C46R (SNP: rs1799841). The 14,328 Da isoform of cystatin SN previously assigned with polymorphism P31L due to a SNP (rs2070856) was found only in whole saliva. Parotid secretions contained no detectable cystatins while whole saliva largely mirrored the contents of submandibular/sublingual (SMSL) secretions. With fully characterized cystatin intact mass tags it will now be possible to examine the correlation between the abundance of these molecules and human health and disease.
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Affiliation(s)
- Christopher M. Ryan
- The Pasarow Mass Spectrometry Laboratory, The NPI- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles
| | - Puneet Souda
- The Pasarow Mass Spectrometry Laboratory, The NPI- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles
| | - Frederic Halgand
- The Pasarow Mass Spectrometry Laboratory, The NPI- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles
| | - David T. Wong
- School of Dentistry, University of California Los Angeles
- Dental Research Institute, University of California Los Angeles
- The Molecular Biology Institute, University of California Los Angeles
| | - Joseph A. Loo
- The Molecular Biology Institute, University of California Los Angeles
- Departments of Chemistry & Biochemistry and Biological Chemistry, University of California Los Angeles
| | - Kym F. Faull
- The Pasarow Mass Spectrometry Laboratory, The NPI- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles
- The Molecular Biology Institute, University of California Los Angeles
- The Brain Research Institute, University of California Los Angeles
| | - Julian P. Whitelegge
- The Pasarow Mass Spectrometry Laboratory, The NPI- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles
- The Molecular Biology Institute, University of California Los Angeles
- The Brain Research Institute, University of California Los Angeles
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18
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Hu S, Jiang J, Wong DT. Proteomic analysis of saliva: 2D gel electrophoresis, LC-MS/MS, and Western blotting. Methods Mol Biol 2010; 666:31-41. [PMID: 20717776 DOI: 10.1007/978-1-60761-820-1_3] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Saliva harbors a wide spectrum of proteins that may reflect the health/disease status in the human body. Profiling of the proteins in saliva from a disease population can potentially yield valuable clinical parameters to be used for diagnosis and prognosis of the disease. Advances in proteomic technologies have enabled comprehensive profiling of protein expression in cells, tissue, and body fluids. When applied to readily accessible saliva samples from disease patients for biomarker study, such a global approach allows attaining the most discriminatory protein biomarkers that can best predict the disease status. In this chapter, we describe the protocols for proteomic analysis of saliva using 2D gel electrophoresis, Western blotting, and LC-MS/MS.
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Affiliation(s)
- Shen Hu
- School of Dentistry, University of California Los Angeles, Los Angeles, CA, USA
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19
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Potential biomarkers of human salivary function: a modified proteomic approach. Arch Oral Biol 2008; 54:91-100. [PMID: 18804197 DOI: 10.1016/j.archoralbio.2008.08.007] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2007] [Revised: 08/14/2008] [Accepted: 08/21/2008] [Indexed: 11/21/2022]
Abstract
OBJECTIVE In previous studies, we defined groups of subjects with opposite salivary function. Group membership was associated with clinically relevant outcomes. High aggregation-adherence (HAA) groups showed lower levels of caries, supragingival plaque, total streptococci, and Tannerella forsythensis than low high aggregation-adherence (LAA) groups. In this study, we used a proteomic approach to search for biomarkers which could be useful as risk indicators for those outcomes. DESIGN Clarified resting whole saliva from each of 41 HAA and LAA subjects was separated by preparative isoelectric focusing. Fractions showing the most distinctive protein profiles were pooled into four sets (pI 3-3.5, pI 4-4.7, pI 5.7-7.7, pI 10-11.5). Each pool then was compared by SDS-PAGE. Image analysis software was used to quantify matched bands. Partial least squares analysis (PLS) was used to determine which of the 65 bands from all four pools were the best predictors of group membership, caries, total plaque, total streptococci, and T. forsythensis counts. Those bands were identified by mass spectroscopy (MS-MS). RESULTS Two bands consistently were strong predictors in separate PLS analyses of each outcome variable. In follow-up univariate analyses, those bands showed the strongest significant differences between the HAA and LAA groups. They also showed significant inverse correlations with caries and all the microbiological variables. MSMS identified those bands as statherin, and a truncated cystatin S missing the first eight N-terminal amino acids. CONCLUSIONS Levels of statherin and truncated cystatin S may be potential risk indicators for the development of caries and other oral diseases.
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20
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Carbachol-induced in vitro secretion of certain human submandibular proteins investigated by mass-spectrometry. Arch Oral Biol 2008; 53:1077-83. [PMID: 18617156 DOI: 10.1016/j.archoralbio.2008.06.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2007] [Revised: 03/03/2008] [Accepted: 06/04/2008] [Indexed: 11/22/2022]
Abstract
OBJECTIVE To investigate protein content of saliva produced in vitro by samples of human submandibular gland following stimulation with the muscarinic agent carbachol. DESIGN Tissue samples, obtained at surgery from seven patients and showing normal morphological appearance, were tested for 30 min: in absence of carbachol and atropine; in presence of carbachol (10 microM); in presence of carbachol (10 microM) and atropine (20 microM); or in presence of just atropine (20 microM). Medium was analysed by high-performance liquid chromatography-mass-spectrometry. Neither before nor during surgery were the patients exposed to drug treatments that were likely to influence the in vitro secretion. RESULTS Proline-rich proteins (PRP)-1 and -3, peptide PC and PB, statherin, cystatins SN, S1 and S2 were invariably found in control gland tissue medium. Mean concentrations of these proteins/peptides in the medium were non-proportionally elevated following carbachol exposure to the gland tissues. Difference between basal release and carbachol-induced secretion achieved statistical significance as to all the proteins/peptides under study but for statherin. Atropine alone or atropine plus carbachol caused no significant changes compared to the basal release of proteins/peptides. CONCLUSIONS In vitro studies on salivary glands make it possible to study protein secretion from individual glands and thus, to reveal the contribution of the various types of gland to protein/peptide content of whole saliva. The disproportional responses to carbachol may imply that the proteins/peptides are not confined to the same cells or to the same intracellular locations and are therefore not secreted as packages at parasympathetic cholinergic activity.
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21
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Ulker AE, Tulunoglu O, Ozmeric N, Can M, Demirtas S. The evaluation of cystatin C, IL-1beta, and TNF-alpha levels in total saliva and gingival crevicular fluid from 11- to 16-year-old children. J Periodontol 2008; 79:854-60. [PMID: 18454664 DOI: 10.1902/jop.2008.070422] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND The aim of this study was to evaluate the levels of cystatin C, interleukin-1beta (IL-1beta), and tumor necrosis factor-alpha (TNF-alpha) in the total saliva and gingival crevicular fluid (GCF) of periodontally healthy children (PHC) and children with gingivitis (CG) who were between 11 and 16 years old. METHODS The study was carried out with 10 PHC and 25 CG. Unstimulated total saliva and GCF samples were obtained. Clinical parameters, including probing depth (PD), clinical attachment loss (CAL), plaque index (PI), gingival index (GI), and gingival bleeding index (GBI), were assessed. GCF samples were collected from four maxillary upper incisors. After sampling, biochemical analyses were performed using latex particle-enhanced turbidimetric immunoassay for cystatin C and enzyme-linked immunosorbent assay for IL-1beta and TNF-alpha. The multivariate analysis of variance test was used for statistical evaluation. RESULTS In total saliva, cystatin C and TNF-alpha levels were higher in PHC, and IL-1beta levels were higher in CG, but the differences were not statistically significant. In GCF, cystatin C levels were higher in PHC (P >0.05), whereas TNF-alpha and IL-1beta levels were higher in CG (P >0.05). In the CG group, there were positive correlations between the GCF cystatin C level and the PI of the sampled site (r = 0.488; P <0.05); also, GCF IL-1beta (r = 0.603; P <0.05) and TNF-alpha (r = 0.456; P <0.05) levels were positively correlated with PD and CAL. For the whole mouth and the sampled sites, PI, GI, GBI, PD, and CAL values were higher in CG (P <0.05), but no significant differences were detected between GCF volumes of the two groups. CONCLUSIONS To the best of our knowledge, this study represents the first evaluation of cystatin C in the gingival disease mechanism in children. Our results showed that total saliva and GCF cystatin C levels were higher in PHC (P >0.05), but there was no correlation between cystatin C levels and IL-1beta or TNF-alpha levels in total saliva or GCF.
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Affiliation(s)
- A Evren Ulker
- Department of Pediatric Dentistry, Faculty of Dentistry, Gazi University, Ankara, Turkey
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22
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Messana I, Cabras T, Pisano E, Sanna MT, Olianas A, Manconi B, Pellegrini M, Paludetti G, Scarano E, Fiorita A, Agostino S, Contucci AM, Calò L, Picciotti PM, Manni A, Bennick A, Vitali A, Fanali C, Inzitari R, Castagnola M. Trafficking and Postsecretory Events Responsible for the Formation of Secreted Human Salivary Peptides. Mol Cell Proteomics 2008; 7:911-26. [DOI: 10.1074/mcp.m700501-mcp200] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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23
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Igarashi A, Ito K, Funayama S, Hitomi Y, Ikui A, Ikeda M, Nomura S. The salivary protein profiles in the patients with taste disorders: The comparison of salivary protein profiles by two-dimensional gel electrophoresis between the patients with taste disorders and healthy subjects. Clin Chim Acta 2008; 388:204-6. [DOI: 10.1016/j.cca.2007.09.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2007] [Revised: 09/27/2007] [Accepted: 09/27/2007] [Indexed: 10/22/2022]
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24
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Schipper RG, Silletti E, Vingerhoeds MH. Saliva as research material: Biochemical, physicochemical and practical aspects. Arch Oral Biol 2007; 52:1114-35. [PMID: 17692813 DOI: 10.1016/j.archoralbio.2007.06.009] [Citation(s) in RCA: 313] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2007] [Revised: 05/29/2007] [Accepted: 06/23/2007] [Indexed: 12/29/2022]
Abstract
Whole saliva is a complex mixture of proteins and other molecules which originate from several sources. The biochemical and physicochemical properties of saliva contribute to the numerous functions of saliva in, e.g., speech, maintaining oral and general health, and food processing. Interest in saliva has increased in the last few years for its potential to diagnose viral, bacterial and systemic diseases. The use of saliva as research material may pose particular problems due to its inherent variability and instability. This review describes practical aspects of salivary as research material with emphasis on protein biochemistry and physical chemistry.
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Affiliation(s)
- Raymond G Schipper
- TI Food and Nutrition, P.O. Box 557, 6700 AN Wageningen, The Netherlands.
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25
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Hu S, Yen Y, Ann D, Wong DT. Implications of salivary proteomics in drug discovery and development: a focus on cancer drug discovery. Drug Discov Today 2007; 12:911-6. [DOI: 10.1016/j.drudis.2007.08.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2007] [Revised: 08/09/2007] [Accepted: 08/21/2007] [Indexed: 01/03/2023]
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26
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A Review of the Salivary Proteome and Peptidome and Saliva-derived Peptide Therapeutics. Int J Pept Res Ther 2007. [DOI: 10.1007/s10989-007-9109-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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27
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Tan S, Liang CRMY, Yeoh KG, So J, Hew CL, Chung MCM. Gastrointestinal fluids proteomics. Proteomics Clin Appl 2007; 1:820-33. [PMID: 21136736 DOI: 10.1002/prca.200700169] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2007] [Indexed: 01/19/2023]
Abstract
Seventy million people suffer from diseases of the gastrointestinal tract annually in US, translating to US$85.5 billion in direct healthcare costs. The debilitating effects of these gastrointestinal (GI) diseases can be circumvented with good biomarkers for early detection of these disorders, which will greatly increase the success of curative treatments. GI fluids represent a potential reservoir of biomarkers for early diagnosis of various GI and systemic diseases since these fluids are the most proximal fluid bathing diseased cells. They are anticipated to have proteomes that closely reflect the ensemble of proteins secreted from the respective GI tissues. Most importantly, the disease markers present in GI fluids should be present in higher concentrations than in sera, thus offering greater sensitivity in their detection. However, proteome analysis of GI fluids can be complex mainly due to the dynamic range of protein content and the numerous PTMs of proteins in each specialized GI compartment. This review attempts to discuss the physiology of the various GI fluids, the special technical considerations required for proteome analysis of each fluid, as well as to summarize the current state of knowledge of biomarker discoveries and clinical utility of GI fluids such as salivary, gastric, pancreatic, and biliary secretions.
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Affiliation(s)
- Sandra Tan
- Department of Biochemistry, Yong Loo Lin School of Medicine, Singapore, Singapore
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28
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Schipper R, Loof A, de Groot J, Harthoorn L, van Heerde W, Dransfield E. Salivary protein/peptide profiling with SELDI-TOF-MS. Ann N Y Acad Sci 2007; 1098:498-503. [PMID: 17435159 DOI: 10.1196/annals.1384.010] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In this study, large-scale profiling of salivary proteins and peptides ranging from 2 to 100 kDa was demonstrated using surface-enhanced laser desorption/ionization-time of flight-mass spectrometry (SELDI-TOF-MS). Results show that chip surface type and sample type critically affect the amount and composition of detected salivary proteins. Delayed processing time resulted in both increase and decrease of peak numbers consistent with proteolysis. SELDI-TOF-MS profiles also changed, depending on storage temperature, although sample processing by centrifugation and numbers of freeze-thaw cycles had a minimal impact. In conclusion, SELDI-TOF-MS offers a simple, rapid, high-throughput technique for profiling low-mass (<10 kDa) saliva proteins/peptides. We wish to use this technique to gain insight into the human saliva proteome composition and its changes over time in response to food consumption.
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Affiliation(s)
- Raymond Schipper
- Wageningen Centre for Food Sciences, TI Food and Nutrition, Laboratory of Food Chemistry, Wageningen University, the Netherlands.
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29
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Hardt M, Witkowska HE, Webb S, Thomas LR, Dixon SE, Hall SC, Fisher SJ. Assessing the effects of diurnal variation on the composition of human parotid saliva: quantitative analysis of native peptides using iTRAQ reagents. Anal Chem 2007; 77:4947-54. [PMID: 16053308 DOI: 10.1021/ac050161r] [Citation(s) in RCA: 130] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Changes in salivary composition correlate with disease susceptibility, disease state, or both. However, use of saliva for diagnostic purposes is complicated by the gland-specific effects of circadian rhythm or diurnal variation. We recently characterized a suite of peptides in the < or =10-kDa fraction of human parotid saliva that included many novel species. In this study, we used novel iTRAQ labeling chemistry to investigate possible diurnal effects on peptide generation. We collected samples produced by gustatory stimulation as the ductal secretions at four time points under conditions that minimized proteolysis, pooled them according to collection time, and isolated the LMW fractions. Samples collected at each collection time were derivatized with a different isobaric iTRAQ reagent. The labeled samples were combined, separated by reversed-phase HPLC, co-spotted with matrix on MALDI targets, and analyzed by MALDI TOF/TOF mass spectrometry. With this approach, we achieved relative quantification of the parotid peptides at four time points. In several cases, abundance during the day changed dramatically. iTRAQ tagging improved the efficiency of MS/MS fragmentation, which in turn allowed the identification of several novel peptides. Our results demonstrated both the utility of this method and the importance of diurnal effects on the composition of the human parotid saliva peptidome.
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Affiliation(s)
- Markus Hardt
- Departments of Cell and Tissue Biology, University of California San Francisco, CA 94143, USA
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30
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Schipper R, Loof A, de Groot J, Harthoorn L, Dransfield E, van Heerde W. SELDI-TOF-MS of saliva: Methodology and pre-treatment effects. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 847:45-53. [PMID: 17070117 DOI: 10.1016/j.jchromb.2006.10.005] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2006] [Revised: 09/28/2006] [Accepted: 10/08/2006] [Indexed: 10/24/2022]
Abstract
Interest in saliva as a diagnostic fluid for monitoring general health and for early diagnosis of disease has increased in the last few years. In particular, efforts have focused on the generation of protein maps of saliva using advanced proteomics technology. Surface-enhanced laser-desorption/ionization time-of-flight mass spectrometry (SELDI-TOF-MS) is a novel high throughput and extremely sensitive proteomic approach that allows protein expression profiling of large sets of complex biological specimens. In this study, large scale profiling of salivary proteins and peptides, ranging from 2 to 100kDa was demonstrated using SELDI-TOF-MS. Various methodological aspects and pre-analytical variables were analysed with respect to their effects on saliva SELDI-TOF-MS profiling. Results show that chip surface type and sample type (unstimulated versus stimulated) critically affect the amount and composition of detected salivary proteins. Factors that influenced normal saliva protein profiling were matrix composition, sample dilution and binding buffer properties. Delayed processing time experiments show certain new peptides evolving 3h post-saliva donation, and quantitative analyses indicate relative intensity of other proteins and peptides changing with time. The addition of protease inhibitors partly counteracted the destabilization of certain protein/peptide mass spectra over time suggesting that some proteins in saliva are subject to digestion by intrinsic salivary proteases. SELDI-TOF-MS profiles also changed by varying storage time and storage temperature whereas centrifugation speed and freeze-thaw cycles had minimal impact. In conclusion, SELDI-TOF-MS offers a high throughput platform for saliva protein and peptide profiling, however, (pre-)analytical conditions must be taken into account for valid interpretation of the acquired data.
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Affiliation(s)
- Raymond Schipper
- Wageningen Centre for Food Sciences, P.O. Box 557, 6700 AN Wageningen, The Netherlands.
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31
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Amado FML, Vitorino RMP, Domingues PMDN, Lobo MJC, Duarte JAR. Analysis of the human saliva proteome. Expert Rev Proteomics 2007; 2:521-39. [PMID: 16097886 DOI: 10.1586/14789450.2.4.521] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Interest in the characterization of the salivary proteome has increased in the last few years. This review discusses the different techniques and methodologies applied to the separation and identification of salivary proteins. Nowadays, proteomic techniques are the state of the art for the analysis of biologic materials and saliva is no exception. 2D electrophoresis and tryptic digest analysis by mass spectrometry are the typical methodology, but new approaches using 2D liquid chromatography/mass spectrometry methods have already been introduced for saliva analysis. Due to their important physiologic role in the oral cavity, low-molecular-weight proteins and peptides are also included in this article and the methodologies discussed.
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Abstract
The newest results in the application of various chromatographic methods (gas-liquid chromatography, liquid chromatographic techniques, electrically driven systems) for the separation and quantitative determination of amino acids and short peptides in pure state and in complicated matrices are compiled. The results are concisely described and critically evaluated. The future trends of the chromatographic analysis of amino acids and short peptides are briefly discussed.
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Affiliation(s)
- T Cserháti
- Research Institute of Materials and Environmental Chemistry, Chemical Research Center, Hungarian Academy of Sciences, Budapest, Hungary.
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Abstract
The focus of this article is to review the recent advances in proteome analysis of human body fluids, including plasma/serum, urine, cerebrospinal fluid, saliva, bronchoalveolar lavage fluid, synovial fluid, nipple aspirate fluid, tear fluid, and amniotic fluid, as well as its applications to human disease biomarker discovery. We aim to summarize the proteomics technologies currently used for global identification and quantification of body fluid proteins, and elaborate the putative biomarkers discovered for a variety of human diseases through human body fluid proteome (HBFP) analysis. Some critical concerns and perspectives in this emerging field are also discussed. With the advances made in proteomics technologies, the impact of HBFP analysis in the search for clinically relevant disease biomarkers would be realized in the future.
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Affiliation(s)
- Shen Hu
- School of Dentistry, Division of Oral Biology and Medicine, Dental Research Institute, University of California, Los Angeles, CA 90095, USA.
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Inzitari R, Cabras T, Rossetti DV, Fanali C, Vitali A, Pellegrini M, Paludetti G, Manni A, Giardina B, Messana I, Castagnola M. Detection in human saliva of different statherin and P-B fragments and derivatives. Proteomics 2006; 6:6370-9. [PMID: 17080484 DOI: 10.1002/pmic.200600395] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Statherin is a multifunctional polypeptide specific of human saliva involved in oral calcium homeostasis, phosphate buffering and formation of protein networks. Salivary P-B peptide is usually included into the basic proline-rich protein family but it shows some similarities with statherin and its specific biological role is still undefined. In this study, various fragments and derivatives of statherin and P-B peptide were consistently detected by RP-HPLC ESI-IT MS in 23 samples of human saliva. They were: statherin mono- and non-phosphorylated, statherin Des-Phe(43) (statherin SV1), statherin Des-Thr(42),Phe(43), statherin Des-Asp(1), statherin Des(6-15) (statherin SV2), statherin Des(1-9), statherin Des(1-10), statherin Des(1-13) and P-B Des(1-5). Statherin SV3 (statherin Des(6-15), Phe(43)) was detected only in one sample. Identity of the fragments was confirmed either by MS/MS experiments or by enzymatic digestion or by Edman sequencing. Detection of the fragments suggests that statherin and P-B peptide are submitted to post-translational proteolytic cleavages that are common to other classes of salivary proteins.
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Affiliation(s)
- Rosanna Inzitari
- Istituto di Biochimica e Biochimica Clinica, Università Cattolica, Rome, Italy
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Neyraud E, Sayd T, Morzel M, Dransfield E. Proteomic analysis of human whole and parotid salivas following stimulation by different tastes. J Proteome Res 2006; 5:2474-80. [PMID: 16944961 DOI: 10.1021/pr060189z] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Whole and parotid salivas, collected after stimulation with tastants, were analyzed by 2D electrophoresis and mass spectrometry. In whole saliva, the number of proteins affected by taste stimulation increased in the order sweet < umami < bitter < acid. Annexin A1 and calgranulin A, involved in inflammation, were over-represented after umami, bitter, and sour stimulations. Their low abundance or absence in parotid saliva after bitter stimulation suggested that they originated from other oral glands or tissues.
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Affiliation(s)
- Eric Neyraud
- Wageningen Centre for Food Sciences, Diedenweg 20, PO Box 557, 6700 AN Wageningen, The Netherlands
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Guo T, Rudnick PA, Wang W, Lee CS, Devoe DL, Balgley BM. Characterization of the human salivary proteome by capillary isoelectric focusing/nanoreversed-phase liquid chromatography coupled with ESI-tandem MS. J Proteome Res 2006; 5:1469-78. [PMID: 16739998 DOI: 10.1021/pr060065m] [Citation(s) in RCA: 125] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Saliva is a readily available body fluid with great diagnostic potential. The foundation for saliva-based diagnostics, however, is the development of a complete catalog of secreted and "leaked" proteins detectable in saliva. By employing a capillary isoelectric focusing-based multidimensional separation platform coupled with electrospray ionization tandem mass spectrometry (MS), a total of 5338 distinct peptides were sequenced, leading to the identification of 1381 distinct proteins. A search of bacterial protein sequences also identified many peptides unique to several organisms and unique to the NCBI nonredundant database. To the best of our knowledge, this proteome study represents the largest catalog of proteins measured from a single saliva sample to date. Data analysis was performed on individual MS/MS spectra using the highly specific peptide identification algorithm, OMSSA. Searches were conducted against a decoyed SwissProt human database to control the false-positive rate at 1%. Furthermore, the well-curated SwissProt sequences represent perhaps the least redundant human protein sequence database (12,484 records versus the 50,009 records found in the International Protein Index human database), therefore minimizing multiple protein inferences from single peptides. This combined bioanalytical and bioinformatic approach has established a solid foundation for building up the human salivary proteome for the realization of the diagnostic potential of saliva.
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Affiliation(s)
- Tong Guo
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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Pisano E, Cabras T, Montaldo C, Piras V, Inzitari R, Olmi C, Castagnola M, Messana I. Peptides of human gingival crevicular fluid determined by HPLC-ESI-MS. Eur J Oral Sci 2005; 113:462-8. [PMID: 16324135 DOI: 10.1111/j.1600-0722.2005.00246.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The acidic-soluble protein content of human gingival crevicular fluid was analyzed by reverse-phase high-performance liquid chromatography (RP-HPLC), and the eluent deriving from the chromatography separation was directly introduced into an ion-trap mass spectrometer through electrospray ionization (ESI-IT MS). By this technique the molecular weight of peptides/proteins was determined with a precision of approximately 1/10,000 amu. On the basis of the chromatographic behavior and the knowledge of the molecular mass value, some peptides and proteins soluble in acidic solution were unambiguously recognized. Besides high quantities of human serum albumin, alpha-defensins 1-4 and minor amounts of cystatin A, statherin, basic PB salivary peptide and other unidentified components were detected. The presence of alpha-defensins in gingival crevicular fluid is in agreement with their relevant contribution to protein composition deriving from granulocyte secretions. Other peptides and proteins abundant in human saliva, such as proline-rich proteins (PRPs) and histatins, were not detected in gingival crevicular fluid. Further investigations will be necessary to establish the origin of statherin and PB salivary peptide in gingival crevicular fluid.
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Affiliation(s)
- Elisabetta Pisano
- Department of Odontostomatology, Cagliari University, Cagliari, Italy
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Hirtz C, Chevalier F, Centeno D, Egea JC, Rossignol M, Sommerer N, de Périère D. Complexity of the human whole saliva proteome. J Physiol Biochem 2005; 61:469-80. [PMID: 16440601 DOI: 10.1007/bf03168453] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Recent characterization of the whole saliva proteome led to contradictory pictures concerning the complexity of its proteome. In this work, 110 proteins were analysed by mass spectrometry allowing the identification of 10 accessions previously not detected on protein two-dimensional maps, including myosin heavy chain (fast skeletal muscle, IIA and IIB), phosphatidylethanolamine binding protein, secretory actin-binding protein precursor and triosephosphate isomerase. Further comparison with available data demonstrated simultaneously a low diversity in terms of variety of accessions and a high complexity in terms of number of protein spots identifying the same accession, the two thirds of identified spots corresponding to amylases, cystatins and immunoglobulins. This diversity may be of interest in the development of non invasive diagnostic tool for several disease.
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Affiliation(s)
- C Hirtz
- Laboratory of Physiology, UFR d'Odontologie, Université Montpellier 1, France.
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Hu S, Xie Y, Ramachandran P, Ogorzalek Loo RR, Li Y, Loo JA, Wong DT. Large-scale identification of proteins in human salivary proteome by liquid chromatography/mass spectrometry and two-dimensional gel electrophoresis-mass spectrometry. Proteomics 2005; 5:1714-28. [PMID: 15800970 DOI: 10.1002/pmic.200401037] [Citation(s) in RCA: 271] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Human saliva contains a large number of proteins and peptides (salivary proteome) that help maintain homeostasis in the oral cavity. Global analysis of human salivary proteome is important for understanding oral health and disease pathogenesis. In this study, large-scale identification of salivary proteins was demonstrated by using shotgun proteomics and two-dimensinal gel electrophoresis-mass spectrometry (2-DE-MS). For the shotgun approach, whole saliva proteins were prefractionated according to molecular weight. The smallest fraction, presumably containing salivary peptides, was directly separated by capillary liquid chromatography (LC). However, the large protein fractions were digested into peptides for subsequent LC separation. Separated peptides were analyzed by on-line electrospray tandem mass spectrometry (MS/MS) using a quadrupole-time of flight mass spectrometer, and the obtained spectra were automatically processed to search human protein sequence database for protein identification. Additionally, 2-DE was used to map out the proteins in whole saliva. Protein spots 105 in number were excised and in-gel digested; and the resulting peptide fragments were measured by matrix-assisted laser desorption/ionization-mass spectrometry and sequenced by LC-MS/MS for protein identification. In total, we cataloged 309 proteins from human whole saliva by using these two proteomic approaches.
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Affiliation(s)
- Shen Hu
- School of Dentistry & Dental Research Institute, University of California, Los Angeles, CA 90095, USA
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Inzitari R, Cabras T, Onnis G, Olmi C, Mastinu A, Sanna MT, Pellegrini MG, Castagnola M, Messana I. Different isoforms and post-translational modifications of human salivary acidic proline-rich proteins. Proteomics 2005; 5:805-15. [PMID: 15693058 DOI: 10.1002/pmic.200401156] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The human salivary acidic proline-rich proteins (aPRPs) complex was investigated by different chromatographic and mass spectrometric approaches and the main aPRPs, namely PRP-1, PRP-2 and PIF-s (15,515 amu), Db-s (17,632 amu) and Pa (15,462 amu) proteins, were detected. All these isoforms are phosphorylated at Ser-8 and Ser-22 and have a pyroglutamic moiety at the N-terminus. Apart from Pa, all the other aPRPs undergo a proteolytic cleavage at Arg-106 residue (Arg-127 in Db-s protein), that generates the small PC peptide (4371 amu) and PRP-3, PRP-4, PIF-f (11,162 amu) and Db-f (13,280 amu) proteins, all of which were detected. With regard to the Pa protein, the main form detected was the dimeric derivative (Pa 2-mer, 30,922 amu) originated by a disulfide bond involving Cys-103 residue. Besides these known isoforms, several previously undetected aPRP derivatives were found (in minor amounts): (i) the triphosphorylated derivatives of PRP-1/PRP-2/PIF-s and Db-s, showing the additional phosphate group at Ser-17; (ii) the mono-phosphorylated forms at either Ser-22 or Ser-8 of PRP-1/PRP-2/PIF-s, PRP-3/PRP-4/PIF-f, Db-s and Db-f; (iii) a nonphosphorylated form of PRP-3/PRP-4/PIF-f; (iv) the triphosphorylated and diphosphorylated forms of Pa 2-mer. Moreover, minor quantities of PRP-3/PRP-4/PIF-f lacking the C-terminal Arg (11,006 amu), and of Pa 2-mer lacking the C-terminal Gln (30,793 amu) were found. By this approach the different phenotypes of PRH1 locus in 59 different subjects were characterized.
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Affiliation(s)
- Rosanna Inzitari
- Istituto di Biochimica e Biochimica Clinica, Facoltà di Medicina, Università Cattolica, Rome, Italy
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Messana I, Cabras T, Inzitari R, Lupi A, Zuppi C, Olmi C, Fadda MB, Cordaro M, Giardina B, Castagnola M. Characterization of the human salivary basic proline-rich protein complex by a proteomic approach. J Proteome Res 2005; 3:792-800. [PMID: 15359733 DOI: 10.1021/pr049953c] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thirteen samples of human normal whole saliva were analyzed by RP-HPLC-ESI-MS and MALDI-TOF-MS to investigate the basic proline-rich protein complex. Between known basic-PRPs the P-B, P-C (or IB-8b), P-D (or IB-5), P-E (or IB-9), P-F (or IB-8c), P-H (or IB-4), IB-6, II-2, IB-1, and IB-8a glucosylated were identified, whereas the II-1, IB-7, PA, and D1-A peptides were not detected. Some detected masses not attributable to known basic-PRPs were putatively ascribed to II-2 and IB-1 nonphosphorylated, II-2 and IB-1 missing the C-terminal arginine residue, and the 1-62 fragment of IB-6, named P-J peptide. A correlation matrix analysis revealed a cluster of correlation among all the basic PRPs (apart from the P-B peptide) which is in agreement with their common parotid origin.
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Affiliation(s)
- Irene Messana
- Department of Sciences Applied to Biosystems, Cagliari University, Cagliari, Italy
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Current Awareness on Comparative and Functional Genomics. Comp Funct Genomics 2003. [PMCID: PMC2447285 DOI: 10.1002/cfg.230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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