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Machado LFA, Filho LRG, Santos FAA, Siravenha LQ, Silva ANMR, Queiroz MAF, Vallinoto ACR, Ishak MOG, Ishak R. Bioprospection and Selection of Peptides by Phage Display as Novel Epitope-Based Diagnostic Probes for Serological Detection of HTLV-1 and Use in Future Vaccines. Front Med (Lausanne) 2022; 9:884738. [PMID: 35755076 PMCID: PMC9218527 DOI: 10.3389/fmed.2022.884738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Accepted: 05/09/2022] [Indexed: 11/23/2022] Open
Abstract
Human T-lymphotropic virus 1 (HTLV-1) is endemic worldwide and the infection results in severe diseases, including Adult T-cell Leukemia (ATL) and HTLV-1 associated myelopathy (HAM). There are some limitations of employing the present commercial serological assays for both diagnostic and epidemiological purposes in different geographical areas of the Brazil, such as the Amazon Region. Currently, methods for diagnosis are usually expensive to adapt for routine use. The aim of this work was to identify and characterize specific ligands to IgG that mimic HTLV-1 epitopes through the Phage Display technique, which could be used for diagnosis and as future vaccine candidates. Initially, IgG from 10 patients with HTLV-1 and 20 negative controls were covalently coupled to protein G-magnetic beads. After biopanning, genetic sequencing, bioinformatics analysis and Phage-ELISA were performed. The technique allowed the identification of 4 clones with HTLV-1 mimetic peptides, three aligned with gp46, A6 (SPYW), B6 (SQLP) and D7 (PLIL), and one with the protease and Tax, A8 (SPPR). Clones A6 and B6 showed higher values of accessibility, antigenicity and hydrophilicity. The reactivity of the clones evaluated by the Receiver Operating Characteristic (ROC) curve showed that the B6 clone had the highest Area Under Curve (0.83) and sensitivity and specificity values (both were 77.27 %; p < 0.001). The study showed that the Phage Display technique is effective for the identification of HTLV-1-related peptides. Clone B6 indicated to be a good marker for bioprospecting diagnostic test for HTLV-1 infection and could be used as a possible vaccine candidate for future studies.
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Affiliation(s)
- Luiz Fernando Almeida Machado
- Biology of Infectious and Parasitic Agents Post-Graduate Program, Federal University of Pará, Belém, Brazil
- Virology Laboratory, Institute of Biological Sciences, Federal University of Pará, Belem, Brazil
- *Correspondence: Luiz Fernando Almeida Machado
| | - Luiz Ricardo Goulart Filho
- Laboratory of Nanobiotechnology, Institute of Biotechnology, Federal University of Uberlandia, Uberlandia, Brazil
| | | | - Leonardo Quintão Siravenha
- Biology of Infectious and Parasitic Agents Post-Graduate Program, Federal University of Pará, Belém, Brazil
| | | | | | - Antonio Carlos Rosário Vallinoto
- Biology of Infectious and Parasitic Agents Post-Graduate Program, Federal University of Pará, Belém, Brazil
- Virology Laboratory, Institute of Biological Sciences, Federal University of Pará, Belem, Brazil
| | | | - Ricardo Ishak
- Biology of Infectious and Parasitic Agents Post-Graduate Program, Federal University of Pará, Belém, Brazil
- Virology Laboratory, Institute of Biological Sciences, Federal University of Pará, Belem, Brazil
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Sampaio EC, Aben-Athar CYUP, Pinto DDS, Vallinoto ACR, Cayres Vallinoto IMV. Occupational Therapy for People Living With Human T-Lymphotropic Virus 1: Importance and Effectiveness of an Intervention Plan at the Level of Prevention and Rehabilitation. Front Med (Lausanne) 2022; 9:859889. [PMID: 35425772 PMCID: PMC9001934 DOI: 10.3389/fmed.2022.859889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 03/07/2022] [Indexed: 11/28/2022] Open
Abstract
Introduction Human T-lymphotropic virus 1 (HTLV-1)-associated myelopathy (HAM) restricts activities of daily living (ADLs), affecting health and quality of life. Occupational therapy is used to promote independence during ADL in people living with HTLV (PLHTLV). Objective To quantify the clinical aspects, levels of functionality, performance in ADLs and occupational roles of PLHTLV and propose an occupational therapeutic intervention. Method A cross-sectional, descriptive, observational study was designed with 40 PLHTLV monitored at two referral laboratories of the Federal University of Pará. The Evandro Chagas Research Institute Neurological Disability Scale (EIPEC-2), the Barthel Index and the Occupational Roles Identification List were applied. The G test and Fisher’s exact test (to identify associations between qualitative variables), the Mann–Whitney test (to identify associations between quantitative variables) and Pearson correlation analysis (to identify associations between the total Barthel Index and EIPEC-2 scores) were performed with Microsoft Excel and BioEstat 5.0, and the significance level was set at p ≤ 0.05. Results Motor aspects, the presence of spasticity, sensory aspects, and pain in the lumbar region and lower limbs were significantly (p = 0.0002) higher among symptomatic individuals, who also had more difficulties urinating, traveling up and down stairs and transferring from a chair to a bed. Being a worker, performing housework and socializing (with friends or family members) were the most affected activities among HAM patients. Conclusion The impact of HAM on PLHTLV should include an intervention plan with occupational therapists in rehabilitation programs to create an important third-level prevention initiative, which may help achieve short-, medium-, and long-term goals. Asymptomatic PLHTLV should also be able to prevent future ADL impairment.
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Affiliation(s)
- Edilson Coelho Sampaio
- Institute of Health Sciences, Federal University of Pará, Belém, Brazil.,Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Cintia Yolette Urbano Pauxis Aben-Athar
- Institute of Health Sciences, Federal University of Pará, Belém, Brazil.,Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Denise da Silva Pinto
- Institute of Health Sciences, Federal University of Pará, Belém, Brazil.,Laboratory of Studies in Functional Rehabilitation of the Tropical Medicine Center, Federal University of Pará, Belém, Brazil
| | | | - Izaura Maria Vieira Cayres Vallinoto
- Institute of Health Sciences, Federal University of Pará, Belém, Brazil.,Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
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Miranda AE, Rosadas C, Assone T, Pereira GFM, Vallinoto ACR, Ishak R. Strengths, Weaknesses, Opportunities and Threats (SWOT) Analysis of the Implementation of Public Health Policies on HTLV-1 in Brazil. Front Med (Lausanne) 2022; 9:859115. [PMID: 35462992 PMCID: PMC9021745 DOI: 10.3389/fmed.2022.859115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 03/09/2022] [Indexed: 11/30/2022] Open
Abstract
Human T lymphotropic virus 1 (HTLV-1) is a public health issue for most countries and imposes important consequences on patients' health and socioeconomic status. Brazil is one of the global leaders of the public health response to these viruses. The country has challenges to overcome to implement meaningful policies aiming to eliminate HTLV-1/2. An analysis of strengths, weaknesses, opportunities, and threats (SWOT) for the implementation of public health policies on HTLV-1/2 was performed. The strengths identified were the Brazilian Unified Health System (SUS); Brazilian expertise in public health programs successfully implemented; currently available policies targeting HTLV; and strong collaboration with researchers and patient's representative. Lack of awareness about HTLV, insufficient epidemiological data, lack of reference centers for patient care, insufficient availability of confirmatory tests, lack of universal antenatal screening, and absence of cost-effectiveness studies were identified as weaknesses. Some interesting opportunities included the increased interest from international organizations on HTLV, possibility of integrating HTLV into other programs, external funding for research, available online platforms, opportunity to acquire data from HTLV-1/2 surveillance to gather epidemiological information, and HTLV policies that were implemented independently by states and municipalities. In addition to the COVID-19 pandemic, existing demands from different diseases, the country's demography and its marked sociocultural diversity and the volatility of the technical team working with HTLV-1/2 at the Brazilian Ministry of Health are threats to the implementation of public policies on HTLV-1/2. This SWOT analysis will facilitate strategic planning to allow continuous progress of the Brazilian response to HTLV-1/2 infection.
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Affiliation(s)
- Angelica Espinosa Miranda
- Departamento de Condições Crônicas e Infecções Sexualmente Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde, Brasília, Brazil
- Departamento de Medicina Social, Universidade Federal do Espírito Santo, Vitória, Brazil
- *Correspondence: Angelica Espinosa Miranda
| | - Carolina Rosadas
- Section of Virology, Department of Infectious Disease, Faculty of Medicine, Imperial College London, London, United Kingdom
| | - Tatiane Assone
- Departamento de Condições Crônicas e Infecções Sexualmente Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde, Brasília, Brazil
- Laboratório de Investigação Médica em Neurologia, Faculdade de Medicina, Instituto de Medicina Tropical de São Paulo, Universidade São Paulo, São Paulo, Brazil
| | - Gerson Fernando Mendes Pereira
- Departamento de Condições Crônicas e Infecções Sexualmente Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde, Brasília, Brazil
| | | | - Ricardo Ishak
- Laboratório de Virologia, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Brazil
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Lopes FT, de Sousa RS, Carvalho Gomes JL, Vallinoto MC, de Lima ACR, Lima SS, Freitas FB, Feitosa RNM, Rangel da Silva ANM, Machado LFA, Aben-Athar CYP, Maia da Silva EL, Cayres Vallinoto IMV, Vallinoto ACR. The Relevance of a Diagnostic and Counseling Service for People Living With HTLV-1/2 in a Metropolis of the Brazilian Amazon. Front Public Health 2022; 10:864861. [PMID: 35419336 PMCID: PMC8995423 DOI: 10.3389/fpubh.2022.864861] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 02/16/2022] [Indexed: 11/13/2022] Open
Abstract
Introduction To identify the prevalence of infection in the urban area of the capital city of Belém, Brazil, the Laboratory of Virology of the Federal University of Pará implemented, as a public service, serological screening for human T-lymphotropic viruses 1 and 2 (HTLV-1/2) infection and, if necessary, counseling service and referral to specialized medical care. The project is funded by the National Council of Science and Technology, the Ministry of Health of Brazil and the Pan American Health Organization. Methods From January 2020 to June 2021, 1,572 individuals of both sexes were approached to answer a questionnaire and were tested using an enzyme immunoassay (Murex HTLV-I+II, DiaSorin, Dartford, UK). Seropositive samples were confirmed as HTLV-1 and HTLV-2 infection by line immunoassay (INNO-LIA® HTLV I/II Score, Fujirebio, Japan) and/or by real-time polymerase chain reaction. G and Fisher's exact tests were applied to identify the association between epidemiological characteristics and HTLV-1/2 infection. Results Of the 1,572 screened individuals, 63.74% were females between the ages of 30 and 59 years (49.04%). Infection was confirmed in six individuals (0.38%), among whom three (0.19%) were infected with HTLV-1 and three with HTLV-2 (0.19%). Blood transfusion before 1993 was the main risk factor associated with the route of exposure to the virus (p = 0.0442). The infected individuals were referred to a counseling session with a nursing professional, and two patients who manifested signs and symptoms suggestive of myelopathy associated with HTLV were referred to a neurologist. Conclusion The implementation of the screening service revealed the occurrence of moderate endemicity of HTLV-1/2 in Belém, reinforcing the importance of continuing the service as a means of establishing an early diagnosis and providing counseling as a measure to prevent and control viral transmission in the general population.
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Affiliation(s)
- Felipe Teixeira Lopes
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Renata Santos de Sousa
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | | | - Mariana Cayres Vallinoto
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Aline Cecy Rocha de Lima
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Sandra Souza Lima
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | | | | | | | - Luiz Fernando A. Machado
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Cintia Y. P. Aben-Athar
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
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