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Smith AA, Forero M, Finkelman MD, Dolan K. A dental desensitization program for children with autism spectrum disorder. J Dent Educ 2022. [DOI: 10.1002/jdd.13154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 09/27/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Affiliation(s)
- Adrienne A Smith
- Pediatric Dental Resident – PGY‐1 Children's Hospital of Wisconsin Milwaukee WI
| | - Martha Forero
- Department of Public Health and Community Service Tufts University School of Dental Medicine Boston MA
| | - Matthew D. Finkelman
- Department of Public Health and Community Service Tufts University School of Dental Medicine Boston MA
| | - Kathryn Dolan
- Department of Public Health and Community Service Tufts University School of Dental Medicine Boston MA
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Patarroyo MA, Patarroyo ME, Pabón L, Alba MP, Bermudez A, Rugeles MT, Díaz-Arevalo D, Zapata-Builes W, Zapata MI, Reyes C, Suarez CF, Agudelo W, López C, Aza-Conde J, Melo M, Escamilla L, Oviedo J, Guzmán F, Silva Y, Forero M, Flórez-Álvarez L, Aguilar-Jimenez W, Moreno-Vranich A, Garry J, Avendaño C. SM-COLSARSPROT: Highly Immunogenic Supramutational Synthetic Peptides Covering the World's Population. Front Immunol 2022; 13:859905. [PMID: 35693819 PMCID: PMC9175637 DOI: 10.3389/fimmu.2022.859905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 04/19/2022] [Indexed: 12/02/2022] Open
Abstract
Fifty ~20-amino acid (aa)-long peptides were selected from functionally relevant SARS-CoV-2 S, M, and E proteins for trial B-21 and another 53 common ones, plus some new ones derived from the virus' main genetic variants for complementary trial C-21. Peptide selection was based on tremendous SARS-CoV-2 genetic variability for analysing them concerning vast human immunogenetic polymorphism for developing the first supramutational, Colombian SARS-protection (SM-COLSARSPROT), peptide mixture. Specific physicochemical rules were followed, i.e., aa predilection for polyproline type II left-handed (PPIIL) formation, replacing β-branched, aromatic aa, short-chain backbone H-bond-forming residues, π-π interactions (n→π* and π-CH), aa interaction with π systems, and molecular fragments able to interact with them, disrupting PPIIL propensity formation. All these modified structures had PPIIL formation propensity to enable target peptide interaction with human leukocyte antigen-DRβ1* (HLA-DRβ1*) molecules to mediate antigen presentation and induce an appropriate immune response. Such modified peptides were designed for human use; however, they induced high antibody titres against S, M, and E parental mutant peptides and neutralising antibodies when suitably modified and chemically synthesised for immunising 61 major histocompatibility complex class II (MHCII) DNA genotyped Aotus monkeys (matched with their corresponding HLA-DRβ1* molecules), predicted to cover 77.5% to 83.1% of the world's population. Such chemically synthesised peptide mixture represents an extremely pure, stable, reliable, and cheap vaccine for COVID-19 pandemic control, providing a new approach for a logical, rational, and soundly established methodology for other vaccine development.
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Affiliation(s)
- Manuel A. Patarroyo
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Manuel E. Patarroyo
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Laura Pabón
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Martha P. Alba
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Adriana Bermudez
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - María Teresa Rugeles
- Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia UdeA, Medellín, Colombia
| | - Diana Díaz-Arevalo
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Wildeman Zapata-Builes
- Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia UdeA, Medellín, Colombia
| | - María Isabel Zapata
- Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia UdeA, Medellín, Colombia
| | - César Reyes
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Carlos F. Suarez
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - William Agudelo
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Carolina López
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Jorge Aza-Conde
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Miguel Melo
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Luis Escamilla
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Jairo Oviedo
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Fanny Guzmán
- Núcleo de Biotecnología, Pontificia U. Católica de Valparaíso, Valparaíso, Chile
| | - Yolanda Silva
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Martha Forero
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Lizdany Flórez-Álvarez
- Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia UdeA, Medellín, Colombia
| | - Wbeimar Aguilar-Jimenez
- Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia UdeA, Medellín, Colombia
| | - Armando Moreno-Vranich
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Jason Garry
- Grupos: Síntesis Química, Resonancia Magnética Nuclear y Cálculo Estructural, Biología Molecular e Inmunología e Inmuno-Química, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Catalina Avendaño
- Facultad de Ciencias Agropecualrias, Universidad de Ciencias Aplicadas y Ambientales (UDCA), Bogotá, Colombia
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Shanthanna H, Czuczman M, Moisiuk P, O'Hare T, Khan M, Forero M, Davis K, Moro J, Vanniyasingam T, Foster G, Thabane L, Alolabi B. Erector spinae plane block vs. peri-articular injection for pain control after arthroscopic shoulder surgery: a randomised controlled trial. Anaesthesia 2021; 77:301-310. [PMID: 34861745 DOI: 10.1111/anae.15625] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/28/2021] [Indexed: 11/28/2022]
Abstract
Interscalene brachial plexus block is the standard regional analgesic technique for shoulder surgery. Given its adverse effects, alternative techniques have been explored. Reports suggest that the erector spinae plane block may potentially provide effective analgesia following shoulder surgery. However, its analgesic efficacy for shoulder surgery compared with placebo or local anaesthetic infiltration has never been established. We conducted a randomised controlled trial to compare the analgesic efficacy of pre-operative T2 erector spinae plane block with peri-articular infiltration at the end of surgery. Sixty-two patients undergoing arthroscopic shoulder repair were randomly assigned to receive active erector spinae plane block with saline peri-articular injection (n = 31) or active peri-articular injection with saline erector spinae plane block (n = 31) in a blinded double-dummy design. Primary outcome was resting pain score in recovery. Secondary outcomes included pain scores with movement; opioid use; patient satisfaction; adverse effects in hospital; and outcomes at 24 h and 1 month. There was no difference in pain scores in recovery, with a median difference (95%CI) of 0.6 (-1.9-3.1), p = 0.65. Median postoperative oral morphine equivalent utilisation was significantly higher in the erector spinae plane group (21 mg vs. 12 mg; p = 0.028). Itching was observed in 10% of patients who received erector spinae plane block and there was no difference in the incidence of significant nausea and vomiting. Patient satisfaction scores, and pain scores and opioid use at 24 h were similar. At 1 month, six (peri-articular injection) and eight (erector spinae plane block) patients reported persistent pain. Erector spinae plane block was not superior to peri-articular injection for arthroscopic shoulder surgery.
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Affiliation(s)
- H Shanthanna
- Department of Anesthesia, St Joseph's Health Care, McMaster University, Hamilton, ON, Canada.,Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada
| | - M Czuczman
- Department of Anesthesia, St Joseph's Health Care, McMaster University, Hamilton, ON, Canada
| | - P Moisiuk
- Department of Anesthesia, St Joseph's Health Care, McMaster University, Hamilton, ON, Canada
| | - T O'Hare
- Department of Anesthesia, St Joseph's Health Care, McMaster University, Hamilton, ON, Canada
| | - M Khan
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada.,Department of Surgery, Joseph's Healthcare, McMaster University, Hamilton, ON, Canada
| | - M Forero
- Department of Anesthesia, St Joseph's Health Care, McMaster University, Hamilton, ON, Canada
| | - K Davis
- Department of Anesthesia, St Joseph's Health Care, McMaster University, Hamilton, ON, Canada
| | - J Moro
- Department of Surgery, Joseph's Healthcare, McMaster University, Hamilton, ON, Canada
| | - T Vanniyasingam
- Department of Anesthesia, St Joseph's Health Care, McMaster University, Hamilton, ON, Canada
| | - G Foster
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada.,Research Institute of St Joes, Hamilton, ON, Canada
| | - L Thabane
- Department of Anesthesia, St Joseph's Health Care, McMaster University, Hamilton, ON, Canada.,Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada
| | - B Alolabi
- Department of Surgery, Joseph's Healthcare, McMaster University, Hamilton, ON, Canada
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Patarroyo ME, Patarroyo MA, Alba MP, Pabon L, Rugeles MT, Aguilar-Jimenez W, Florez L, Bermudez A, Rout AK, Griesinger C, Suarez CF, Aza-Conde J, Reyes C, Avendaño C, Samacá J, Camargo A, Silva Y, Forero M, Gonzalez E. The First Chemically-Synthesised, Highly Immunogenic Anti-SARS-CoV-2 Peptides in DNA Genotyped Aotus Monkeys for Human Use. Front Immunol 2021; 12:724060. [PMID: 34539660 PMCID: PMC8446425 DOI: 10.3389/fimmu.2021.724060] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 08/02/2021] [Indexed: 12/12/2022] Open
Abstract
Thirty-five peptides selected from functionally-relevant SARS-CoV-2 spike (S), membrane (M), and envelope (E) proteins were suitably modified for immunising MHC class II (MHCII) DNA-genotyped Aotus monkeys and matched with HLA-DRβ1* molecules for use in humans. This was aimed at producing the first minimal subunit-based, chemically-synthesised, immunogenic molecules (COLSARSPROT) covering several HLA alleles. They were predicted to cover 48.25% of the world’s population for 6 weeks (short-term) and 33.65% for 15 weeks (long-lasting) as they induced very high immunofluorescent antibody (IFA) and ELISA titres against S, M and E parental native peptides, SARS-CoV-2 neutralising antibodies and host cell infection. The same immunological methods that led to identifying new peptides for inclusion in the COLSARSPROT mixture were used for antigenicity studies. Peptides were analysed with serum samples from patients suffering mild or severe SARS-CoV-2 infection, thereby increasing chemically-synthesised peptides’ potential coverage for the world populations up to 62.9%. These peptides’ 3D structural analysis (by 1H-NMR acquired at 600 to 900 MHz) suggested structural-functional immunological association. This first multi-protein, multi-epitope, minimal subunit-based, chemically-synthesised, highly immunogenic peptide mixture highlights such chemical synthesis methodology’s potential for rapidly obtaining very pure, highly reproducible, stable, cheap, easily-modifiable peptides for inducing immune protection against COVID-19, covering a substantial percentage of the human population.
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Affiliation(s)
- Manuel E Patarroyo
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia.,Universidad Santo Tomás, Bogotá, Colombia
| | - Manuel A Patarroyo
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Martha P Alba
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Laura Pabon
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - María T Rugeles
- Grupo Inmunovirología, Universidad de Antioquia, Medellín, Colombia
| | | | - Lizdany Florez
- Grupo Inmunovirología, Universidad de Antioquia, Medellín, Colombia
| | - Adriana Bermudez
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Ashok K Rout
- Department of NMR Based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Christian Griesinger
- Department of NMR Based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Carlos F Suarez
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Jorge Aza-Conde
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - César Reyes
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Catalina Avendaño
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia.,Universidad de Ciencias Aplicadas y Ambientales (U.D.C.A), Bogotá, Colombia
| | - Jhoan Samacá
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Anny Camargo
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Yolanda Silva
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Martha Forero
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
| | - Edgardo Gonzalez
- Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
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Lapalma J, Palazzi L, Forero M, Schwartzmann A. Site of action of erector spinae plane block (ESPB) - A magnetic resonance imaging study in a child. Rev Esp Anestesiol Reanim (Engl Ed) 2021; 68:424-425. [PMID: 34509279 DOI: 10.1016/j.redare.2021.03.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 06/23/2020] [Indexed: 06/13/2023]
Affiliation(s)
- J Lapalma
- Departamento de Anestesia, Hospital de Niños Dr.Orlando Alassia, San José del Rincón, Santa Fe, Argentina
| | - L Palazzi
- Departamento de Anestesia, Hospital de Niños Dr.Orlando Alassia, San José del Rincón, Santa Fe, Argentina
| | - M Forero
- Department of Anesthesia, University of Mac Master, Hamilton, Canada
| | - A Schwartzmann
- Departamento de Anestesia, Hospital de Clínicas, Universidad de la República, Montevideo, Uruguay.
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Vilchis Rentería JS, Peng PWH, Forero M. The erector spinae plane block for obstetric analgesia: a case series of a novel technique. Anaesth Rep 2020; 8:e12083. [DOI: 10.1002/anr3.12083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/05/2020] [Indexed: 11/11/2022] Open
Affiliation(s)
- J. S. Vilchis Rentería
- Department of Obstetric Anaesthesia Hospital Materno Infantil de Alta Especialidad Guadalupe Nuevo León México
| | - P. W. H. Peng
- Department of Anesthesiology and Pain Management University Health NetworkUniversity of Toronto Canada
| | - M. Forero
- Department of Anesthesia McMaster University Hamilton Ontario Canada
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Khanbodaghi A, Natto ZS, Forero M, Loo CY. Effectiveness of interprofessional oral health program for pediatric nurse practitioner students at Northeastern University, United States. BMC Oral Health 2019; 19:170. [PMID: 31370848 PMCID: PMC6670221 DOI: 10.1186/s12903-019-0861-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Accepted: 07/22/2019] [Indexed: 12/31/2022] Open
Abstract
Background Interprofessional education (IPE) is an important part of the landscape of modern education. However, there is a significant deficiency of studies that evaluate IPE in dentistry. The aim of this article is to evaluate the effects of an oral health educational program on the dental knowledge, awareness, attitude, confidence, and behavior of pediatric nurse practitioner (PNP) students and to emphasize the importance of IPE for PNP. Methods First-year pediatric nurse practitioners from Northeastern University participated in an IPE oral health education seminal and practical session as a pilot study. Several tests were used to evaluate the effectiveness of the educational program. The post-test assessed the knowledge, awareness, attitude, confidence, and behavior of the students immediately after attending the lecture; again immediately after hands on experience; and finally at a follow-up approximately a month after attending the training module. The training module consists of prevention and anticipatory guidance; caries process and management; trauma and dental emergencies. Differences in score items were evaluated between 4 time points. Friedman’s, Wilcoxon signed-rank and McNemar’s tests were used to analyze the results. Results Knowledge score was determined based on the number of correct responses to seven questions, while awareness score was based on the median of eight questions. Fifteen confidence, attitude, and behavior questions were used. The total sample size was 16 students with a mean age 33.31 ± 7.52. The majority were females (87.5%). Significant improvement was seen in all subjects’ overall knowledge of oral health topics. The confidence, attitude, and behavior scores were differed by time of test (P < 0.01). It was the highest after post-test and the lowest in pre-test. Conclusion Our study suggests that introducing an Interprofessional education program for pediatric nurse practitioner students can provide them with adequate knowledge, awareness, confidence, and attitude regarding oral health issues. It also can help them in changing behavior, prevention and ongoing dental surveillance.
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Affiliation(s)
- Azita Khanbodaghi
- Department of Pediatric Dentistry, Tufts University School of Dental Medicine, 1 Kneeland Street, Boston, MA, 02111, USA.
| | - Zuhair S Natto
- Department of Dental Public Health, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Martha Forero
- Department of Pediatric Dentistry, Tufts University School of Dental Medicine, 1 Kneeland Street, Boston, MA, 02111, USA
| | - Cheen Y Loo
- Department of Pediatric Dentistry, Tufts University School of Dental Medicine, 1 Kneeland Street, Boston, MA, 02111, USA
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Vidal E, Giménez H, Forero M, Fajardo M. Erector spinae plane block: A cadaver study to determine its mechanism of action. Rev Esp Anestesiol Reanim (Engl Ed) 2018; 65:514-519. [PMID: 30166123 DOI: 10.1016/j.redar.2018.07.004] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 07/13/2018] [Accepted: 07/13/2018] [Indexed: 06/08/2023]
Abstract
INTRODUCTION The erector spinae plane (ESP) block is a novel technique for the treatment of acute and chronic pain. Its mechanism and site of action has not yet been explained properly. OBJECTIVES In order to explain the mechanism of action of the ESP block, injections were performed with methylene blue to simulate the local anaesthetics and to determine its distribution from the anterior side of the thorax. To find an aperture or channel through which the local anaesthetic passes from posterior to anterior through the muscular and bone structures. MATERIALS AND METHODS Four spinal columns of fresh cryopreserved corpses were used. A total of 9 ultrasound-guided ESP blocks were performed in different regions of the specimens using 20ml of 0.01% methylene blue per block. The distribution of the dye was observed from the anterior side of the thorax, measuring the amount of intercostal spaces stained, before and after the removal of the parietal pleura, and the structures in which the stain was found were recorded. RESULTS In all blocks of the ESP, dye was found in the paravertebral space, intercostal spaces, and in some cases in the prevertebral chain. The blocks had a mean of 4.6 intercostal spaces stained, with a maximum of 7 and a minimum of 3. The intensity of the dye was greater on the side of the injection, dorsal to the column, than that found in the ventral part below of the pleura. It was not possible to verify a clear channel through which the dye diffuses towards the previous zone. CONCLUSIONS From the data collected in this study, it can be deduced that the blockade of the ESP has a mechanism of anaesthetic action similar to paravertebral blocks. The site from which the anaesthetic would cross from the posterior plane of the spine to the anterior region of the thorax was not clear, and should be investigated in future works.
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Affiliation(s)
- E Vidal
- Servicio de Anestesiología, Hospital Durand, Ciudad de Buenos Aires, Argentina.
| | - H Giménez
- Servicio de Anestesiología, Hospital Durand, Ciudad de Buenos Aires, Argentina
| | - M Forero
- Departamento de Anestesia, McMaster University, Hamilton, Ontario, Canadá
| | - M Fajardo
- Servicio de Anestesiología, Hospital Universitario de Móstoles, Móstoles, Madrid, España
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Affiliation(s)
- K. J. Chin
- Toronto Western Hospital; University of Toronto; Toronto Ontario Canada
| | - S. Adhikary
- Toronto Western Hospital; University of Toronto; Toronto Ontario Canada
| | - M. Forero
- Toronto Western Hospital; University of Toronto; Toronto Ontario Canada
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Chin KJ, Adhikary S, Sarwani N, Forero M. The analgesic efficacy of pre-operative bilateral erector spinae plane (ESP) blocks in patients having ventral hernia repair. Anaesthesia 2017; 72:452-460. [PMID: 28188621 DOI: 10.1111/anae.13814] [Citation(s) in RCA: 255] [Impact Index Per Article: 36.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/19/2016] [Indexed: 01/27/2023]
Abstract
Laparoscopic ventral hernia repair is an operation associated with significant postoperative pain, and regional anaesthetic techniques are of potential benefit. The erector spinae plane (ESP) block performed at the level of the T5 transverse process has recently been described for thoracic surgery, and we hypothesised that performing the ESP block at a lower vertebral level would provide effective abdominal analgesia. We performed pre-operative bilateral ESP blocks with 20-30 ml ropivacaine 0.5% at the level of the T7 transverse process in four patients undergoing laparoscopic ventral hernia repair. Median (range) 24-h opioid consumption was 18.7 mg (0.0-43.0 mg) oral morphine. The highest and lowest median (range) pain scores in the first 24 h were 3.5 (3.0-5.0) and 2.5 (0.0-3.0) on an 11-point numerical rating scale. We also performed the block in a fresh cadaver and assessed the extent of injectate spread using computerised tomography. There was radiographic evidence of spread extending cranially to the upper thoracic levels and caudally as far as the L2-L3 transverse processes. We conclude that the ESP block is a promising regional anaesthetic technique for laparoscopic ventral hernia repair and other abdominal surgery when performed at the level of the T7 transverse process. Its advantages are the ability to block both supra-umbilical and infra-umbilical dermatomes with a single-level injection and its relative simplicity.
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Affiliation(s)
- K J Chin
- Department of Anaesthesia, Toronto Western Hospital, University of Toronto, Toronto, Ontario, Canada
| | - S Adhikary
- Department of Anesthesiology and Perioperative Medicine, Penn State Hershey College of Medicine, Hershey, Pennsylvania, USA
| | - N Sarwani
- Department of Radiology, Penn State Hershey College of Medicine, Hershey, Pennsylvania, USA
| | - M Forero
- Department of Anaesthesia, McMaster University, Hamilton, Ontario, Canada
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Cifuentes DP, Ocampo M, Curtidor H, Vanegas M, Forero M, Patarroyo ME, Patarroyo MA. Mycobacterium tuberculosis Rv0679c protein sequences involved in host-cell infection: potential TB vaccine candidate antigen. BMC Microbiol 2010; 10:109. [PMID: 20388213 PMCID: PMC2873487 DOI: 10.1186/1471-2180-10-109] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Accepted: 04/13/2010] [Indexed: 11/16/2022] Open
Abstract
Background To date, the function of many hypothetical membrane proteins of Mycobacterium tuberculosis is still unknown and their involvement in pathogen-host interactions has not been yet clearly defined. In this study, the biological activity of peptides derived from the hypothetical membrane protein Rv0679c of M. tuberculosis and their involvement in pathogen-host interactions was assessed. Transcription of the Rv0679c gene was studied in 26 Mycobacterium spp. Strains. Antibodies raised against putative B-cell epitopes of Rv0679c were used in Western blot and immunoelectron microscopy assays. Synthetic peptides spanning the entire length of the protein were tested for their ability to bind to A549 and U937 cells. High-activity binding peptides (HABPs) identified in Rv0679c were tested for their ability to inhibit mycobacterial invasion into cells. Results The gene encoding Rv0679c was detected in all strains of the M. tuberculosis complex (MTC), but was only transcribed in M. tuberculosis H37Rv, M. tuberculosis H37Ra and M. africanum. Anti-Rv0679c antibodies specifically recognized the protein in M. tuberculosis H37Rv sonicate and showed its localization on mycobacterial surface. Four HABPs inhibited invasion of M. tuberculosis to target cells by up to 75%. Conclusions The results indicate that Rv0679c HABPs and in particular HABP 30979 could be playing an important role during M. tuberculosis invasion of host cells, and therefore could be interesting research targets for studies aimed at developing strategies to control tuberculosis.
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Affiliation(s)
- Diana P Cifuentes
- Fundación Instituto de Inmunología de Colombia, Carrera 50 No, 26-20, Bogotá, Colombia
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12
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García J, Curtidor H, Pinzón CG, Patarroyo MA, Vanegas M, Forero M, Patarroyo ME. Well-Defined Regions of the Plasmodium falciparum Reticulocyte Binding Protein Homologue 4 Mediate Interaction with Red Blood Cell Membrane. J Med Chem 2009; 53:811-21. [DOI: 10.1021/jm901540n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jeison García
- Fundación Instituto de Inmunología de Colombia FIDIC, Carrera 50 No. 26-20, Bogotá, Colombia
- Universidad del Rosario, Calle 14 No. 6-25, Bogotá, Colombia
| | - Hernando Curtidor
- Fundación Instituto de Inmunología de Colombia FIDIC, Carrera 50 No. 26-20, Bogotá, Colombia
- Universidad del Rosario, Calle 14 No. 6-25, Bogotá, Colombia
| | - Carlos G. Pinzón
- Fundación Instituto de Inmunología de Colombia FIDIC, Carrera 50 No. 26-20, Bogotá, Colombia
- Universidad del Rosario, Calle 14 No. 6-25, Bogotá, Colombia
| | - Manuel A. Patarroyo
- Fundación Instituto de Inmunología de Colombia FIDIC, Carrera 50 No. 26-20, Bogotá, Colombia
- Universidad del Rosario, Calle 14 No. 6-25, Bogotá, Colombia
| | - Magnolia Vanegas
- Fundación Instituto de Inmunología de Colombia FIDIC, Carrera 50 No. 26-20, Bogotá, Colombia
- Universidad del Rosario, Calle 14 No. 6-25, Bogotá, Colombia
| | - Martha Forero
- Fundación Instituto de Inmunología de Colombia FIDIC, Carrera 50 No. 26-20, Bogotá, Colombia
- Universidad del Rosario, Calle 14 No. 6-25, Bogotá, Colombia
| | - Manuel E. Patarroyo
- Fundación Instituto de Inmunología de Colombia FIDIC, Carrera 50 No. 26-20, Bogotá, Colombia
- Universidad Nacional de Colombia, Carrera 45 No. 26-85, Bogotá, Colombia
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Martínez PA, Yandar N, Lesmes LP, Forero M, Pérez-Leal O, Patarroyo ME, Lozano JM. Passive transfer of Plasmodium falciparum MSP-2 pseudopeptide-induced antibodies efficiently controlled parasitemia in Plasmodium berghei-infected mice. Peptides 2009; 30:330-42. [PMID: 19071172 DOI: 10.1016/j.peptides.2008.10.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2008] [Revised: 10/24/2008] [Accepted: 10/27/2008] [Indexed: 11/19/2022]
Abstract
We have developed monoclonal antibodies directed against the pseudopeptide psi-130, derived from the highly conserved malarial antigen Plasmodium falciparum merozoite surface protein 2 (MSP-2), for obtaining novel molecular tools with potential applications in the control of malaria. Following isotype switching, these antibodies were tested for their ability to suppress blood-stage parasitemia through passive immunization in malaria-infected mice. Some proved totally effective in suppressing a lethal blood-stage challenge infection and others reduced malarial parasitemia. Protection against P. berghei malaria following Ig passive immunization can be associated with specific immunoglobulins induced by a site-directed designed MSP-2 reduced amide pseudopeptide.
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Affiliation(s)
- Paola A Martínez
- Fundación Instituto de Inmunología de Colombia-FIDIC, Bogotá, Colombia
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14
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Curtidor H, García J, Vanegas M, Puentes F, Forero M, Patarroyo ME. Identification of peptides with high red blood cell and hepatocyte binding activity in the Plasmodium falciparum multi-stage invasion proteins: PfSPATR and MCP-1. Biochimie 2008; 90:1750-9. [DOI: 10.1016/j.biochi.2008.08.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2008] [Accepted: 08/25/2008] [Indexed: 11/30/2022]
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15
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Curtidor H, Arévalo G, Vanegas M, Vizcaíno C, Patarroyo MA, Forero M, Patarroyo ME. Characterization of Plasmodium falciparum integral membrane protein Pf25-IMP and identification of its red blood cell binding sequences inhibiting merozoite invasion in vitro. Protein Sci 2008; 17:1494-504. [PMID: 18556472 DOI: 10.1110/ps.036251.108] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The identification of proteins present on the surface of Plasmodium falciparum-infected red blood cells as well as of free merozoites has been widely considered as one of the main areas of research in the development of an antimalarial vaccine due to their involvement in the parasite's pathogenesis and invasion mechanisms. Major advances had been accomplished in this area thanks to the analysis of the reported genomic sequence of P. falciparum, allowing for the identification of genes encoding for putative integral membrane proteins. This study reports for the first time the transcription of the MAL8P1.3 gene, which codifies for a 25-kDa integral membrane protein of P. falciparum (FCB-2 strain), namely, Pf25-IMP. Western blot and immunofluorescence assays using goat polyclonal sera indicate that this protein is expressed in erythrocytic asexual blood stages. A highly robust, sensible, and specific receptor-ligand interaction assay allowed identification of two high activity binding peptides (HABPs) derived from Pf25-IMP: 30577 ((41)YKTANENVKLASSLSDRLSR(60)) and 30583 ((161)LNKKTVVRKIAEGLGYTIVF(180)). Both HABPs bound with high affinity to human red blood cells (RBCs), and such binding was susceptible to enzyme treatment with trypsin. A common RBC surface receptor of apparently 48 kDa was found for both HABPs, plus an additional 31-kDa receptor for HABP 30577. HABP 30577 inhibited merozoite invasion in vitro by 73%, while HABP 30583 showed a 59% inhibition at 200 microM concentration. The data suggest a possible role of Pf25-IMP in merozoite invasion to RBCs and support its inclusion in further immunological studies for evaluating its potential as vaccine candidates.
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16
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Patarroyo MA, Plaza DF, Ocampo M, Curtidor H, Forero M, Rodriguez LE, Patarroyo ME. Functional characterization of Mycobacterium tuberculosis Rv2969c membrane protein. Biochem Biophys Res Commun 2008; 372:935-40. [PMID: 18539140 DOI: 10.1016/j.bbrc.2008.05.157] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2008] [Accepted: 05/29/2008] [Indexed: 11/24/2022]
Abstract
Identifying Mycobacterium tuberculosis membrane proteins involved in binding to and invasion of host cells is important in designing subunit-based anti-tuberculosis vaccines. The Rv2969c gene sequence was identified by PCR in M. tuberculosis complex strains, being transcribed in M. tuberculosis H37Rv, M. tuberculosis H37Ra, and M. bovis BCG. Rabbits immunized with synthetic peptides from highly specific conserved regions of this protein produced antibodies recognizing 27 and 29 kDa bands in M. tuberculosis lysate, which is consistent with the molecular weight of the Rv2969c gene product in M. tuberculosis H37Rv. Immunoelectron microscopy revealed the protein was localized on the bacillus surface. Four and three specific high activity binding peptides (HABPs) to the A549 alveolar epithelial and U937 monocyte cell lines were found, respectively. Two of the HABPs found inhibited M. tuberculosis invasion of A549 cells, suggesting that these peptides might be good candidates to be included in a multiepitopic, subunit-based anti-tuberculosis vaccine.
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Affiliation(s)
- Manuel A Patarroyo
- Fundacion Instituto de Inmunología de Colombia, Molecular Biology, Carrera 50 # 26-00, Bogotá, Colombia.
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17
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Pinzón CG, Curtidor H, Bermúdez A, Forero M, Vanegas M, Rodríguez J, Patarroyo ME. Studies of Plasmodium falciparum rhoptry-associated membrane antigen (RAMA) protein peptides specifically binding to human RBC. Vaccine 2007; 26:853-62. [PMID: 18191882 DOI: 10.1016/j.vaccine.2007.11.086] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2007] [Revised: 11/02/2007] [Accepted: 11/07/2007] [Indexed: 11/19/2022]
Abstract
Plasmodium falciparum rhoptry-associated membrane antigen (RAMA) peptides used in normal red blood cell (RBC) binding assays revealed that peptides 33426 (79NINILSSVHRKGRILYDSF97) and 33460 (777HKKREKSISPHSYQKVSTKVQ797) bound with high activity, presenting nanomolar affinity constants. Such high binding activity peptides (HABPs) displayed helicoid and random coil structures as determined by circular dichroism. HABPs inhibited P. falciparumin vitro invasion of normal RBC by up to 61% (depending on concentration), suggesting that some RAMA protein regions could be involved in P. falciparum invasion of RBC. The nature and localisation of receptors on RBC surface responsible for HABP binding were studied using enzyme-treated erythrocytes and structural analysis.
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18
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Chapeton-Montes JA, Plaza DF, Curtidor H, Forero M, Vanegas M, Patarroyo ME, Patarroyo MA. Characterizing the Mycobacterium tuberculosis Rv2707 protein and determining its sequences which specifically bind to two human cell lines. Protein Sci 2007; 17:342-51. [PMID: 18096644 DOI: 10.1110/ps.073083308] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The Rv2707 gene encoding a putative alanine- and leucine-rich protein was found to be present in all Mycobacterium tuberculosis complex strains (by PCR) and its transcription was shown by RT-PCR in all but M. bovis and M. microti. Antibodies raised against Rv2707 peptides specifically recognized the native protein by Western blot and were able to locate this protein on the M. tuberculosis membrane by immunoelectron microscopy. A549 and U937 cells lines were used in binding assays involving synthetic peptides covering the whole Rv2707 protein. High A549 cell-binding peptide 16083 (281 QEEWPAPATHAHRLGNWLKAY 300) was identified. Peptides 16072 (61 LFGPDTLPAIEKSALSTAHSY 80) and 16084 (301 RIGVGTTTYSSTAQHSAVAA 320) presented high specific binding to both A549 and U937 cells. Cross-linking assays revealed that peptide 16084 specifically bound to a 40-kDa and a 50-kDa U937 cell membrane protein. High activity binding peptides (HABPs) 16083 and 16084 were able to inhibit M. tuberculosis invasion of A549 cells. Our results suggest that these sequences could be part of the binding sites used by the bacillus for interacting with target cells, and thus represent good candidates to be tested in a future subunit-based, multiepitope, antituberculosis vaccine.
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Affiliation(s)
- Julie A Chapeton-Montes
- Molecular Biology Department, Fundacion Instituto de Inmunologia de Colombia, Bogota 020304, Colombia
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19
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Lozano JM, Montoya-Fajardo FJ, Hoebeke J, Cifuentes GH, Forero M, Patarroyo ME. Antibodies induced by Plasmodium falciparum merozoite surface antigen-2-designed pseudopeptides possess neutralizing properties of the in vitro malarial infection. Peptides 2007; 28:1954-65. [PMID: 17881088 DOI: 10.1016/j.peptides.2007.07.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2007] [Revised: 07/04/2007] [Accepted: 07/06/2007] [Indexed: 10/23/2022]
Abstract
Pseudopeptide chemistry is gaining ground in the field of synthetic vaccine development. We have previously demonstrated the potential scope of introducing reduced amide peptide bond isosters in a site-directed design for obtaining structurally modified probes able to induce malaria infection-neutralizing antibodies derived from the MSP-1 antigen. This work reports the functional properties of polyclonal and monoclonal antibodies induced by site-directed designed MSP-2 N-terminus pseudopeptides and their capacity for antibody isotype switching in in vitro immunization. Structural properties of the native peptide and its pseudopeptide analogs are discussed within the context of these novel pseudopeptides' induced monoclonal antibody functional and physical-chemical properties.
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20
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Forero M, Thomas W, Sokurenko E, Vogel V. Quaternary uncoiling dynamics of type I fimbriae suggest regulatory mechanism for bacterial adhesion. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)83912-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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21
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Forero M, Puentes A, Cortés J, Castillo F, Vera R, Rodríguez LE, Valbuena J, Ocampo M, Curtidor H, Rosas J, García J, Barrera G, Alfonso R, Patarroyo MA, Patarroyo ME. Identifying putative Mycobacterium tuberculosis Rv2004c protein sequences that bind specifically to U937 macrophages and A549 epithelial cells. Protein Sci 2005; 14:2767-80. [PMID: 16199660 PMCID: PMC2253216 DOI: 10.1110/ps.051592505] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Virulence and immunity are still poorly understood in Mycobacterium tuberculosis. The H37Rv M. tuberculosis laboratory strain genome has been completely sequenced, and this along with proteomic technology represent powerful tools contributing toward studying the biology of target cell interaction with a facultative bacillus and designing new strategies for controlling tuberculosis. Rv2004c is a putative M. tuberculosis protein that could have specific mycobacterial functions. This study has revealed that the encoding gene is present in all mycobacterium species belonging to the M. tuberculosis complex. Rv2004c gene transcription was observed in all of this complex's strains except Mycobacterium bovis and Mycobacterium microti. Rv2004c protein expression was confirmed by using antibodies able to recognize a 54-kDa molecule by immunoblotting, and its location was detected on the M. tuberculosis surface by transmission electron microscopy, suggesting that it is a mycobacterial surface protein. Binding assays led to recognizing high activity binding peptides (HABP); five HABPs specifically bound to U937 cells, and six specifically bound to A549 cells. HABP circular dichroism suggested that they had an alpha-helical structure. HABP-target cell interaction was determined to be specific and saturable; some of them also displayed greater affinity for A549 cells than U937 cells. The critical amino acids directly involved in their interaction with U937 cells were also determined. Two probable receptor molecules were found on U937 cells and five on A549 for the two HABPs analyzed. These observations have important biological significance for studying bacillus-target cell interactions and implications for developing strategies for controlling this disease.
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Affiliation(s)
- Martha Forero
- Fundación Instituto de Inmunología de Colombia, Carrera 50 No. 26-00, Bogotá 020304, Colombia
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22
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Valbuena J, Vera R, Puentes A, Ocampo M, Garcia J, Curtidor H, Lopez R, Rodriguez L, Rosas J, Cortes J, Forero M, Pinto M, Patarroyo ME. P. falciparum pro-histoaspartic protease (proHAP) protein peptides bind specifically to erythrocytes and inhibit the invasion process in vitro. Biol Chem 2005; 386:361-7. [PMID: 15899698 DOI: 10.1515/bc.2005.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Plasmodium falciparum histoaspartic protease (HAP) is an active enzyme involved in haemoglobin degradation. HAP is expressed as an inactive 51-kDa zymogen and is cleaved into an active 37-kDa enzyme. It has been proposed that this kind of protease might be implicated in the parasite's invasion of erythrocytes; however, this protein's role during invasion has still to be determined. Synthetic peptides derived from the HAP precursor (proHAP) were tested in erythrocyte binding assays to identify their possible function in the invasion process. Two proHAP high-activity binding peptides (HABPs) specifically bound to erythrocytes; these peptides were numbered 30609 (101LKNYIKESVKLFNKGLTKKS120) and 30610 (121YLGSEFDNVELKDLANVLSF140 ). The binding of these two peptides was saturable, presenting nanomolar affinity constants. These peptides interacted with 26- and 45-kDa proteins on the erythrocyte surface; the nature of these receptor sites was studied in peptide binding assays using enzyme-treated erythrocytes. The HABPs showed greater than 90% merozoite invasion inhibition in in vitro assays. Goat serum containing proHAP polymeric peptide antibodies inhibited parasite invasion in vitro .
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Affiliation(s)
- John Valbuena
- Fundacion Instituto de Inmunologia de Colombia (FIDIC), Cra 50 26-00, Bogotá, Colombia.
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23
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García JE, Curtidor H, López R, Rodríguez L, Vera R, Valbuena J, Rosas J, Ocampo M, Puentes A, Forero M, Patarroyo MA, Patarroyo ME. Liver stage antigen 3 Plasmodium falciparum peptides specifically interacting with HepG2 cells. J Mol Med (Berl) 2004; 82:600-11. [PMID: 15309314 DOI: 10.1007/s00109-004-0573-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2003] [Accepted: 05/26/2004] [Indexed: 10/26/2022]
Abstract
Binding assays were carried out with 20 amino acid long peptides covering the complete 200-kDa Liver stage antigen (LSA) 3 protein sequence to identify its HepG2 cell binding regions. Seventeen HepG2 cell high-activity binding peptides (HABPs) were identified in the LSA-3 protein. Seven HABPs were found in the nonrepeat (NRA) region A; five of these formed a 100 amino acid long HepG2 cell binding region located between residues 21Ile and 120Thr. Six HABPs were found in the R2 region and another four in the NRB2 region. LSA-3 protein HABPS bound saturably to HepG2 cells having nanomolar affinity constants and bound specifically to 31, 44, and 70 kDa HepG2 cell membrane proteins. Some of them were located in antigenic and immunogenic LSA-3 protein regions. Immunofluorescence and immunoblotting assays using goat sera immunized with LSA-3 protein peptides recognized P. falciparum (FCB-2 strain) erythrocyte stage proteins (58, 68, 72, 81, 86, 160, and 175 kDa). This reactivity was due mainly to the VEESVAEN motif present in some erythrocyte stage proteins. However, our results suggest that antibodies against LSA-3 regions had a crossed reaction with another 86-kDa protein, and that this crossed reaction was due to a motif present in the NRA region.
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Affiliation(s)
- Javier E García
- Fundación Instituto de Inmunología de Colombia and Universidad Nacional de Colombia, Carrera 50 26-00, Bogotá, Colombia
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24
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Puentes A, García J, Vera R, López R, Suarez J, Rodríguez L, Curtidor H, Ocampo M, Tovar D, Forero M, Bermudez A, Cortes J, Urquiza M, Patarroyo ME. Sporozoite and liver stage antigen Plasmodium falciparum peptides bind specifically to human hepatocytes. Vaccine 2004; 22:1150-6. [PMID: 15003642 DOI: 10.1016/j.vaccine.2003.09.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2003] [Accepted: 09/26/2003] [Indexed: 11/19/2022]
Abstract
Sporozoite and Liver Stage Antigen (SALSA) sequence synthetic peptides were used in HepG2 cell binding assays to identify regions involved in parasite invasion. SALSA 20608 ( 21IWASEKKDEKEASEQGEESHY40) and 20611 ( 64KKDDGTDKVQEKVLEKSPKY83) peptides were determined as having high binding activity in HepG2 cell assays, some of them were located in immunogenic regions. Immune-fluorescence antibody test with 24276 (20608 peptide analogue, CGIWSSMKMDEKMAAMQGEESHCG) showed sporozoite and merozoite reactivity. This data suggests SALSA high activity binding peptides' (HABPs) possible role in hepatic cell invasion and merozoite invasion of erythrocytes.
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Affiliation(s)
- Alvaro Puentes
- Fundacion Instituto de Inmunología de Colombia and Universidad Nacional de Colombia, Carrera 50 # 26-00, Bogotá, Colombia
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25
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García JE, Puentes A, López R, Vera R, Suárez J, Rodríguez L, Curtidor H, Ocampo M, Tovar D, Forero M, Bermudez A, Cortés J, Urquiza M, Patarroyo ME. Peptides of the liver stage antigen-1 (LSA-1) of Plasmodium falciparum bind to human hepatocytes. Peptides 2003; 24:647-57. [PMID: 12895649 DOI: 10.1016/s0196-9781(03)00135-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Synthetic peptides from the liver stage antigen-1 (LSA-1) antigen sequence were used in HepG2 cell and erythrocyte binding assays to identify regions that could be involved in parasite invasion. LSA-1 protein peptides 20630 ((21)INGKIIKNSEKDEIIKSNLRY(40)), 20637 ((157)KEKLQGQQSDSEQERRAY(173)), 20638 ((174)KEKLQEQQSDLEQERLAY(190)) and 20639 (191KEKLQEQQSDLEQERRAY(207)) had high binding activity in HepG2 assays. Were located in immunogenic regions; peptide cell binding was saturable. Peptide 20630 bound specifically to 48kDa HepG2 membrane surface protein. LSA-1 peptides 20630 ((21)INGKIIKNSEKDEIIKSNLRY(40)) and 20633 ((81)DKELTMSNVKNVSQTNFKSLY(100)) showed specific erythrocyte binding activity and inhibited merozoite invasion of erythrocytes in vitro. A monkey serum prepared against LSA-1 20630 peptide analog (CGINGKNIKNAEKPMIIKSNLRGC) inhibited merozoite invasion in vitro. The data suggest LSA-1 "High Activity Binding Peptides" could play a possible role in hepatic cell invasion as well as merozoite invasion of erythrocytes.
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Affiliation(s)
- Javier E García
- Fundación Instituto de Inmunologi;a de Colombia, Universidad Nacional de Colombia, Bogotá, Colombia
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26
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Bachtold A, Fuhrer MS, Plyasunov S, Forero M, Anderson EH, Zettl A, McEuen PL. Scanned probe microscopy of electronic transport in carbon nanotubes. Phys Rev Lett 2000; 84:6082-6085. [PMID: 10991129 DOI: 10.1103/physrevlett.84.6082] [Citation(s) in RCA: 171] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2000] [Indexed: 05/23/2023]
Abstract
We use electrostatic force microscopy and scanned gate microscopy to probe the conducting properties of carbon nanotubes at room temperature. Multiwalled carbon nanotubes are shown to be diffusive conductors, while metallic single-walled carbon nanotubes are ballistic conductors over micron lengths. Semiconducting single-walled carbon nanotubes are shown to have a series of large barriers to conduction along their length. These measurements are also used to probe the contact resistance and locate breaks in carbon nanotube circuits.
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Affiliation(s)
- A Bachtold
- Department of Physics, University of California, Berkeley, California 94720, USA
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27
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Fuhrer MS, Nygard J, Shih L, Forero M, Yoon YG, Mazzoni MS, Choi HJ, Ihm J, Louie SG, Zettl A, McEuen PL. Crossed nanotube junctions. Science 2000; 288:494-7. [PMID: 10775104 DOI: 10.1126/science.288.5465.494] [Citation(s) in RCA: 365] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Junctions consisting of two crossed single-walled carbon nanotubes were fabricated with electrical contacts at each end of each nanotube. The individual nanotubes were identified as metallic (M) or semiconducting (S), based on their two-terminal conductances; MM, MS, and SS four-terminal devices were studied. The MM and SS junctions had high conductances, on the order of 0.1 e(2)/h (where e is the electron charge and h is Planck's constant). For an MS junction, the semiconducting nanotube was depleted at the junction by the metallic nanotube, forming a rectifying Schottky barrier. We used two- and three-terminal experiments to fully characterize this junction.
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Affiliation(s)
- MS Fuhrer
- Department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. Department of Physics and Center for Theoretical Physics, Seoul National University
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28
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Abstract
The dynamics of the distribution of liposomes for use as drug carriers for the treatment of tuberculosis is studied. While the free radiolabel injected into mice was rapidly excreted by the kidneys, the same label trapped within liposomes was retained for longer periods in the liver, spleen and lung. There were variations in the distribution and retention times of liposomes of different composition. When the distribution of liposomes in healthy and tuberculous mice was compared, a greater accumulation in the liver, spleen and lungs of healthy mice was observed, although the retention time in tuberculous mice was longer. These findings merit consideration in the design of therapies based on liposome-entrapped drugs as the dynamics of distribution and retention differ between normal and infected animals.
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Affiliation(s)
- L C Orozco
- Group of Mycobacteria, Instituto Nacional de Salud, Bogota, Columbia
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