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Hartman E, Wallblom K, van der Plas MJA, Petrlova J, Cai J, Saleh K, Kjellström S, Schmidtchen A. Bioinformatic Analysis of the Wound Peptidome Reveals Potential Biomarkers and Antimicrobial Peptides. Front Immunol 2021; 11:620707. [PMID: 33613550 PMCID: PMC7888259 DOI: 10.3389/fimmu.2020.620707] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Accepted: 12/21/2020] [Indexed: 12/18/2022] Open
Abstract
Wound infection is a common and serious medical condition with an unmet need for improved diagnostic tools. A peptidomic approach, aided by mass spectrometry and bioinformatics, could provide novel means of identifying new peptide biomarkers for wound healing and infection assessment. Wound fluid is suitable for peptidomic analysis since it is both intimately tied to the wound environment and is readily available. In this study we investigate the peptidomes of wound fluids derived from surgical drainages following mastectomy and from wound dressings following facial skin grafting. By applying sorting algorithms and open source third party software to peptidomic label free tandem mass spectrometry data we provide an unbiased general methodology for analyzing and differentiating between peptidomes. We show that the wound fluid peptidomes of patients are highly individualized. However, differences emerge when grouping the patients depending on wound type. Furthermore, the abundance of peptides originating from documented antimicrobial regions of hemoglobin in infected wounds may contribute to an antimicrobial wound environment, as determined by in silico analysis. We validate our findings by compiling literature on peptide biomarkers and peptides of physiological significance and cross checking the results against our dataset, demonstrating that well-documented peptides of immunological significance are abundant in infected wounds, and originate from certain distinct regions in proteins such as hemoglobin and fibrinogen. Ultimately, we have demonstrated the power using sorting algorithms and open source software to help yield insights and visualize peptidomic data.
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Affiliation(s)
- Erik Hartman
- Division of Dermatology and Venereology, Department of Clinical Sciences, Lund University, Lund, Sweden
| | - Karl Wallblom
- Division of Dermatology and Venereology, Department of Clinical Sciences, Lund University, Lund, Sweden
| | - Mariena J. A. van der Plas
- Division of Dermatology and Venereology, Department of Clinical Sciences, Lund University, Lund, Sweden
- LEO Foundation Center for Cutaneous Drug Delivery, Department of Pharmacy, University of Copenhagen, Copenhagen, Denmark
| | - Jitka Petrlova
- Division of Dermatology and Venereology, Department of Clinical Sciences, Lund University, Lund, Sweden
| | - Jun Cai
- LEO Foundation Center for Cutaneous Drug Delivery, Department of Pharmacy, University of Copenhagen, Copenhagen, Denmark
| | - Karim Saleh
- Division of Dermatology and Venereology, Department of Clinical Sciences, Lund University, Lund, Sweden
- Dermatology, Skane University Hospital, Lund, Sweden
| | - Sven Kjellström
- Division of Mass Spectrometry, Department of Clinical Sciences, Lund University, Lund, Sweden
| | - Artur Schmidtchen
- Division of Dermatology and Venereology, Department of Clinical Sciences, Lund University, Lund, Sweden
- Dermatology, Skane University Hospital, Lund, Sweden
- Copenhagen Wound Healing Center, Bispebjerg Hospital, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
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Van Ostade X, Dom M, Tjalma W, Van Raemdonck G. Candidate biomarkers in the cervical vaginal fluid for the (self-)diagnosis of cervical precancer. Arch Gynecol Obstet 2017; 297:295-311. [PMID: 29143101 PMCID: PMC5778162 DOI: 10.1007/s00404-017-4587-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Accepted: 11/06/2017] [Indexed: 11/29/2022]
Abstract
Purpose Despite improvement in vaccines against human papilloma virus (HPV), the causative agent of cervical cancer, screening women for cervical precancer will remain indispensable in the coming 30–40 years. A simple test that could be performed at home or at a doctor’s practice and that informs the woman whether she is at risk would significantly help make a broader group of patients who aware that they need medical treatment. Cervical vaginal fluid (CVF) is a body fluid that is very well suited for such a test. Methods Narrative review of cervical (pre)cancer candidate biomarkers from cervicovaginal fluid, is based on a detailed review of the literature. We will also discuss the possibilities that these biomarkers create for the development of a self-test or point-of-care test for cervical (pre)cancer. Results Several DNA, DNA methylation, miRNA, and protein biomarkers were identified in the cervical vaginal fluid; however, not all of these biomarkers are suited for development of a simple diagnostic assay. Conclusions Proteins, especially alpha-actinin-4, are most suited for development of a simple assay for cervical (pre)cancer. Accuracy of the test could further be improved by combination of several proteins or by combination with a new type of biomarker, e.g., originating from the cervicovaginal microbiome or metabolome.
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Affiliation(s)
- Xaveer Van Ostade
- Laboratory of Protein Science, Proteomics and Epigenetic Signaling (PPES), University of Antwerp, Wilrijk, Belgium. .,Centre for Proteomics (CfP), University of Antwerp, Wilrijk, Belgium.
| | - Martin Dom
- Laboratory of Protein Science, Proteomics and Epigenetic Signaling (PPES), University of Antwerp, Wilrijk, Belgium.,Centre for Proteomics (CfP), University of Antwerp, Wilrijk, Belgium
| | - Wiebren Tjalma
- Gynecological Oncology Unit, Department of Obstetrics and Gynecology, Multidisciplinary Breast Clinic, Antwerp University Hospital, University of Antwerp, Edegem, Belgium
| | - Geert Van Raemdonck
- Laboratory of Protein Science, Proteomics and Epigenetic Signaling (PPES), University of Antwerp, Wilrijk, Belgium.,Centre for Proteomics (CfP), University of Antwerp, Wilrijk, Belgium
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Carvalho LAC, Remuzgo C, Perez KR, Machini MT. Hb40-61a: Novel analogues help expanding the knowledge on chemistry, properties and candidacidal action of this bovine α-hemoglobin-derived peptide. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:3140-9. [PMID: 26367061 DOI: 10.1016/j.bbamem.2015.09.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2015] [Revised: 08/18/2015] [Accepted: 09/08/2015] [Indexed: 11/27/2022]
Abstract
This study expands the knowledge on chemical synthesis and properties of Hb40-61a as well as provides results of the first steps given towards knowing how it kills Candida cells. For the first time, this peptide, its all-D analogue (D-Hb40-61a) and its fluorescently labeled analogue (FAM-Hb40-61a) were successfully assembled on resin at 60°C using conventional heating in all steps. Purified and characterized, these peptides exhibited very low toxicity on human erythrocytes. Hb40-61a and D-Hb40-61a were equally active against Candida strains, ruling out sterically specific interactions on their working mechanism. Cell permeabilization assays confirmed progressive damage of the yeast plasma membrane with increasing concentrations of Hb40-61a. While experiment using the fluorescent probe DiBAC4(5) revealed that this synthetic hemocidin alters the yeast plasma membrane potential, test employing DPH indicated that Hb40-61a might affect its dynamics. Exposure of the yeast cells to FAM-Hb40-61a showed that the peptide accumulates in the cell membrane at the ½ MIC, but stains about 97% of the cells at the MIC. Such effect is salt-dependent and partially energy-dependent. These new findings indicate that the central target of Hb40-61a in Candida cells is the plasma membrane and that this synthetic hemocidin should be considered as a potential candidacidal for topic uses.
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Affiliation(s)
- L A C Carvalho
- Department of Biochemistry, Institute of Chemistry, University of São Paulo, São Paulo, Brazil
| | - C Remuzgo
- Special Laboratory of Pain and Signaling, Butantan Institute, São Paulo, Brazil
| | - K R Perez
- Department of Biophysics, Federal University of São Paulo, São Paulo, Brazil
| | - M T Machini
- Department of Biochemistry, Institute of Chemistry, University of São Paulo, São Paulo, Brazil.
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Chaemsaithong P, Madan I, Romero R, Than NG, Tarca AL, Draghici S, Bhatti G, Yeo L, Mazor M, Kim CJ, Hassan SS, Chaiworapongsa T. Characterization of the myometrial transcriptome in women with an arrest of dilatation during labor. J Perinat Med 2013; 41:665-81. [PMID: 23893668 PMCID: PMC4183453 DOI: 10.1515/jpm-2013-0086] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 05/17/2013] [Indexed: 01/28/2023]
Abstract
OBJECTIVE The molecular basis of failure to progress in labor is poorly understood. This study was undertaken to characterize the myometrial transcriptome of patients with an arrest of dilatation (AODIL). STUDY DESIGN Human myometrium was prospectively collected from women in the following groups: (1) spontaneous term labor (TL; n=29) and (2) arrest of dilatation (AODIL; n=14). Gene expression was characterized using Illumina® HumanHT-12 microarrays. A moderated Student's t-test and false discovery rate adjustment were used for analysis. Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) of selected genes was performed in an independent sample set. Pathway analysis was performed on the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway database using Pathway Analysis with Down-weighting of Overlapping Genes (PADOG). The MetaCore knowledge base was also searched for pathway analysis. RESULTS (1) Forty-two differentially expressed genes were identified in women with an AODIL; (2) gene ontology analysis indicated enrichment of biological processes, which included regulation of angiogenesis, response to hypoxia, inflammatory response, and chemokine-mediated signaling pathway. Enriched molecular functions included transcription repressor activity, heat shock protein (Hsp) 90 binding, and nitric oxide synthase (NOS) activity; (3) MetaCore analysis identified immune response chemokine (C-C motif) ligand 2 (CCL2) signaling, muscle contraction regulation of endothelial nitric oxide synthase (eNOS) activity in endothelial cells, and triiodothyronine and thyroxine signaling as significantly overrepresented (false discovery rate <0.05); (4) qRT-PCR confirmed the overexpression of Nitric oxide synthase 3 (NOS3); hypoxic ischemic factor 1A (HIF1A); Chemokine (C-C motif) ligand 2 (CCL2); angiopoietin-like 4 (ANGPTL4); ADAM metallopeptidase with thrombospondin type 1, motif 9 (ADAMTS9); G protein-coupled receptor 4 (GPR4); metallothionein 1A (MT1A); MT2A; and selectin E (SELE) in an AODIL. CONCLUSION The myometrium of women with AODIL has a stereotypic transcriptome profile. This disorder has been associated with a pattern of gene expression involved in muscle contraction, an inflammatory response, and hypoxia. This is the first comprehensive and unbiased examination of the molecular basis of an AODIL.
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Bulman AL, Dalmasso EA. Purification and identification of candidate biomarkers discovered using SELDI-TOF MS. Methods Mol Biol 2012; 818:49-66. [PMID: 22083815 DOI: 10.1007/978-1-61779-418-6_4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Purification and identification of candidate biomarkers is a critical step in the biomarker development process, since it provides insight into the disease biology and facilitates the development of analyte-specific assays. Top-down biomarker discovery workflows like SELDI-TOF MS yield candidate markers that are identified based on native mass. Positive identification of these candidate biomarkers requires further enrichment and/or purification. While purification methods must be optimized for each protein target, there are two general workflows. Native peptides under approximately 4 kDa can be subjected to direct sequence analysis using a tandem mass spectrometer whereas proteins over approximately 4 kDa usually require proteolytic digestion prior to MS/MS analysis. In both cases, partial purification is usually necessary to enrich the candidate biomarker relative to other proteins in a complex biological mixture. This chapter provides detailed protocols for protein purification (including anion exchange, metal affinity, and reverse phase chromatography as well as SDS-PAGE) and identification (including protein processing, digestion, and database searching).
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Conceição K, Bruni FM, Santos JM, Lopes RM, Marques EE, Fernandez JH, Lopes-Ferreira M. The action of fish peptide Orpotrin analogs on microcirculation. J Pept Sci 2011; 17:192-9. [PMID: 21308875 DOI: 10.1002/psc.1311] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Revised: 08/30/2010] [Accepted: 09/10/2010] [Indexed: 11/12/2022]
Abstract
In order to investigate the relationship between the primary structure of Orpotrin, a vasoactive peptide previously isolated from the freshwater stingray Potamotrygon gr. orbignyi, and its microcirculatory effects, three Orpotrin analogs were synthesized. The analogs have a truncated N-terminal with a His residue deletion and two substituted amino acid residues, where one Nle is substituted for one internal Lys residue and the third analog has a substitution of a Pro for an Ala (Orp-desH(1) , Orp-Nle and Orp-Pro/Ala, respectively). Only Orp-desH(1) could induce a lower vasoconstriction effect compared with the natural Orpotrin, indicating that besides the N-terminal, the positive charge of Lys and the Pro residues located at the center of the amino acid chain is crucial for this vasoconstriction effect. Importantly, the suggestions made with bioactive peptides were based on the molecular modeling and dynamics of peptides, the presence of key amino acids and shared activity in microcirculation, characterized by intravital microscopy. Moreover, this study has demonstrated that even subtle changes in the primary structure of Orpotrin alter the biological effects of this native peptide significantly, which could be of interest for biotechnological applications.
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Affiliation(s)
- Katia Conceição
- LETA (Laboratório Especial de Toxinologia Aplicada) Center for Applied Toxinology (CAT/CEPID), Butantan Institute, São Paulo, SP, Brazil
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Mittal P, Romero R, Tarca AL, Draghici S, Nhan-Chang CL, Chaiworapongsa T, Hotra J, Gomez R, Kusanovic JP, Lee DC, Kim CJ, Hassan SS. A molecular signature of an arrest of descent in human parturition. Am J Obstet Gynecol 2011; 204:177.e15-33. [PMID: 21284969 DOI: 10.1016/j.ajog.2010.09.025] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Revised: 08/18/2010] [Accepted: 09/27/2010] [Indexed: 12/22/2022]
Abstract
OBJECTIVE This study was undertaken to identify the molecular basis of an arrest of descent. STUDY DESIGN Human myometrium was obtained from women in term labor (TL; n = 29) and arrest of descent (AODes; n = 21). Gene expression was characterized using Illumina HumanHT-12 microarrays. A moderated Student t test and false discovery rate adjustment were applied for analysis. Confirmatory quantitative reverse transcription-polymerase chain reaction and immunoblot were performed in an independent sample set. RESULTS Four hundred genes were differentially expressed between women with an AODes compared with those with TL. Gene Ontology analysis indicated enrichment of biological processes and molecular functions related to inflammation and muscle function. Impacted pathways included inflammation and the actin cytoskeleton. Overexpression of hypoxia inducible factor-1a, interleukin -6, and prostaglandin-endoperoxide synthase 2 in AODes was confirmed. CONCLUSION We have identified a stereotypic pattern of gene expression in the myometrium of women with an arrest of descent. This represents the first study examining the molecular basis of an arrest of descent using a genome-wide approach.
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Mittal P, Romero R, Tarca AL, Gonzalez J, Draghici S, Xu Y, Dong Z, Nhan-Chang CL, Chaiworapongsa T, Lye S, Kusanovic JP, Lipovich L, Mazaki-Tovi S, Hassan SS, Mesiano S, Kim CJ. Characterization of the myometrial transcriptome and biological pathways of spontaneous human labor at term. J Perinat Med 2010; 38:617-43. [PMID: 20629487 PMCID: PMC3097097 DOI: 10.1515/jpm.2010.097] [Citation(s) in RCA: 125] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
AIMS to characterize the transcriptome of human myometrium during spontaneous labor at term. METHODS myometrium was obtained from women with (n=19) and without labor (n=20). Illumina HumanHT-12 microarrays were utilized. Moderated t-tests and false discovery rate adjustment of P-values were applied. Real-time quantitative reverse transcriptase-polymerase chain reaction (qRT-PCR) was performed for a select set of differentially expressed genes in a separate set of samples. Enzyme-linked immunosorbent assay and Western blot were utilized to confirm differential protein production in a third sample set. RESULTS 1) Four hundred and seventy-one genes were differentially expressed; 2) gene ontology analysis indicated enrichment of 103 biological processes and 18 molecular functions including: a) inflammatory response; b) cytokine activity; and c) chemokine activity; 3) systems biology pathway analysis using signaling pathway impact analysis indicated six significant pathways: a) cytokine-cytokine receptor interaction; b) Jak-STAT signaling; and c) complement and coagulation cascades; d) NOD-like receptor signaling pathway; e) systemic lupus erythematosus; and f) chemokine signaling pathway; 4) qRT-PCR confirmed over-expression of prostaglandin-endoperoxide synthase-2, heparin binding epidermal growth factor (EGF)-like growth factor, chemokine C-C motif ligand 2 (CCL2/MCP1), leukocyte immunoglobulin-like receptor, subfamily A member 5, interleukin (IL)-8, IL-6, chemokine C-X-C motif ligand 6 (CXCL6/GCP2), nuclear factor of kappa light chain gene enhancer in B-cells inhibitor zeta, suppressor of cytokine signaling 3 (SOCS3) and decreased expression of FK506 binding-protein 5 and aldehyde dehydrogenase in labor; 5) IL-6, CXCL6, CCL2 and SOCS3 protein expression was significantly higher in the term labor group compared to the term not in labor group. CONCLUSIONS myometrium of women in spontaneous labor at term is characterized by a stereotypic gene expression pattern consistent with over-expression of the inflammatory response and leukocyte chemotaxis. Differential gene expression identified with microarray was confirmed with qRT-PCR using an independent set of samples. This study represents an unbiased description of the biological processes involved in spontaneous labor at term based on transcriptomics.
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Affiliation(s)
- Pooja Mittal
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, USA.
| | - Roberto Romero
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA,Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, Michigan, USA,Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Adi L. Tarca
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA,Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, Michigan, USA,Department of Computer Science, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Juan Gonzalez
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA,Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Sorin Draghici
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA,Department of Computer Science, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Yi Xu
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA
| | - Zhong Dong
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA
| | - Chia-Ling Nhan-Chang
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA,Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Tinnakorn Chaiworapongsa
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA,Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Stephen Lye
- Department of Obstetrics and Gynecology, University of Toronto, Toronto, Ontario, Canada
| | - Juan Pedro Kusanovic
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA,Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Leonard Lipovich
- Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, Michigan, USA,Department of Neurology, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Shali Mazaki-Tovi
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA,Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Sonia S. Hassan
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA,Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Sam Mesiano
- Department of Reproductive Biology, Case Western Reserve University, Cleveland, Ohio, USA
| | - Chong Jai Kim
- Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA,Department of Pathology, Wayne State University School of Medicine, Detroit, Michigan, USA
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Peng J, Stanley AJ, Cairns D, Selby PJ, Banks RE. Using the protein chip interface with quadrupole time-of-flight mass spectrometry to directly identify peaks in SELDI profiles--initial evaluation using low molecular weight serum peaks. Proteomics 2009; 9:492-8. [PMID: 19142938 DOI: 10.1002/pmic.200800424] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Mass spectrometric profiling, particularly in the form of SELDI, has been used in many studies, particularly in attempts to generate diagnostic serum profiles. Several studies have generated promising results but one of the limitations is the inability to identify easily potential discriminatory peaks. This may enable specific assays to be developed and increased biological insight. We describe the first systematic technical evaluation of the ProteinChip interface coupled to a tandem mass spectrometer which allows direct sequencing of peptides <6000 Da, and describe the direct sequence identification of 21 peaks commonly observed in serum samples. Additionally we describe for the first time the use of on-chip acetylation to assist in the validation of sequence identification.
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Affiliation(s)
- Jianhe Peng
- Cancer Research UK Clinical Centre, St James's University Hospital, Leeds, UK
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Conceição K, Konno K, Melo RL, Marques EE, Hiruma-Lima CA, Lima C, Richardson M, Pimenta DC, Lopes-Ferreira M. Orpotrin: a novel vasoconstrictor peptide from the venom of the Brazilian stingray Potamotrygon gr. orbignyi. Peptides 2006; 27:3039-46. [PMID: 17056153 DOI: 10.1016/j.peptides.2006.09.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2006] [Revised: 09/06/2006] [Accepted: 09/07/2006] [Indexed: 10/24/2022]
Abstract
Characterization of the peptide content of venoms has a number of potential benefits for basic research, clinical diagnosis, development of new therapeutic agents, and production of antiserum. In order to analyze in detail the peptides and small proteins of crude samples, techniques such as chromatography and mass spectrometry have been employed. The present study describes the isolation, biochemical characterization, and sequence determination of a novel peptide, named Orpotrin from the venom of Potamotrygon gr. orbignyi. The natural peptide was shown to be effective in microcirculatory environment causing a strong vasoconstriction. The peptide was fully sequenced by de novo amino acid sequencing with mass spectrometry and identified as the novel peptide. Its amino acid sequence, HGGYKPTDK, aligns only with creatine kinase residues 97-105, but has no similarity to any bioactive peptide. Therefore, possible production of this peptide from creatine kinase by limited proteolysis is discussed. Taken together, the results indicate the usefulness of this single-step approach for low molecular mass compounds in complex samples such as venoms.
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Affiliation(s)
- Katia Conceição
- Laboratório Especial de Toxinologia Aplicada (LETA), Center for Applied Toxinology (CAT/CEPID), Instituto Butantan, Avenida Vital Brasil, 1500, São Paulo, SP, 05503-900, Brazil.
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Ianzer D, Konno K, Xavier CH, Stöcklin R, Santos RAS, de Camargo ACM, Pimenta DC. Hemorphin and hemorphin-like peptides isolated from dog pancreas and sheep brain are able to potentiate bradykinin activity in vivo. Peptides 2006; 27:2957-66. [PMID: 16904236 DOI: 10.1016/j.peptides.2006.06.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2006] [Revised: 06/22/2006] [Accepted: 06/22/2006] [Indexed: 10/24/2022]
Abstract
Hemorphins are biologically active peptides, derived from hemoglobin, which presents a number of physiological activities. Proteolytic generation of these peptides is not fully understood; however, among their roles, is to provoke reduction on blood pressure. In this work, this particular biological effect was chosen as the monitor for the selection of mammalian vasoactive peptides. By combining high-performance liquid chromatography and mass spectrometry, including 'de novo' sequencing, several hemorphin-like peptides were identified presenting bradykinin potentiating activity. Moreover, taking LVV-hemorphin-7 as model compound, we evaluated its biological effect on blood pressure of anaesthetized rats. By summarizing all the results, it is possible to present the hemorphins as a family of proteolytically generated peptides that are able to potentiate bradykinin activity in vivo.
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Affiliation(s)
- Danielle Ianzer
- Center for Applied Toxinology, CAT-CEPID, Laboratório Especial de Toxinologia Aplicada, Instituto Butantan, Av. Vital Brasil 1500, Sao Paulo, SP 05503-900, Brazil
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