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1.
Mem Inst Oswaldo Cruz ; 119: e230129, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38381878

RESUMEN

BACKGROUND: Leprosy is a highly neglected disease that is considered a serious public health problem in many countries. This illness is characterised by a variety of clinical and histopathological manifestations that are related to the patient immune response. OBJECTIVES: This work aimed evaluate the profile of circulating immune mediators in the plasma from patients classified clinically as paucibacillary (PB), multibacillary (MB), households contacts (HHC), type1 leprosy reaction (T1R), type2 leprosy reaction (T2R) and control individuals without medical history of leprosy (CTL). METHODS: To assessment of the plasma immune mediators was used multiplex microbeads immunoassay "Luminex". FINDINGS: The results showed that patients (PB) had a regulatory-biased profile, while MB revealed a pro-inflammatory trend of highly expressed biomarkers. HHC display conspicuously increased levels in the plasma of the chemokines (CCL2, CCL3, CCL4, CCL5 and CXCL8), pro-inflammatory cytokines (IFN-γ,TNF and IL-1ß), modulating cytokines (IL-9 and IL-1Ra) and growth factors (PDGF, G-CSF and IL-2). Interestingly, HHC displayed superior production of IFN-γ as compared to other leprosy groups, indicating a putative protective role for this cytokine during chronic Mycobacterium leprae exposure. MAIN CONCLUSION: Further investigations are currently underway to elucidate the potential of these mediators as biomarkers applicable to the diagnosis/prognosis of leprosy and also T1R and T2R leprosy reactions.


Asunto(s)
Citocinas , Lepra , Humanos , Mycobacterium leprae , Quimiocinas , Biomarcadores
2.
Front Immunol ; 14: 1130137, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37187734

RESUMEN

Introduction: The aim of the present study was to investigate the association between the single nucleotide polymorphism (SNP) rs1927914 A/G in TLR4 gene and the immunological profile of household contacts (HHC) of leprosy patients. Leprosy classification is usually complex and requires the assessment of several clinical and laboratorial features. Methods: Herein, we have applied distinct models of descriptive analysis to explore qualitative/quantitative changes in chemokine and cytokine production in HHC further categorized according to operational classification [HHC(PB) and HHC(MB)] and according to TLR4SNP. Results and discussion: Our results showed that M. leprae stimuli induced an outstanding production of chemokines (CXCL8;CCL2; CXCL9; CXCL10) by HHC(PB), while increase levels of pro-inflammatory cytokines (IL-6; TNF; IFN-γ; IL-17) were observed for HHC(MB). Moreover, the analysis of chemokine and cytokine signatures demonstrated that A allele was associated with a prominent soluble mediator secretion (CXCL8; CXCL9; IL-6; TNF; IFN-γ). Data analysis according to TLR4 SNP genotypes further demonstrated that AA and AG were associated with a more prominent secretion of soluble mediators as compared to GG, supporting the clustering of AA and AG genotypes into dominant genetic model. CXCL8, IL-6, TNF and IL-17 displayed distinct profiles in HHC(PB) vs HHC(MB) or AA+AG vs GG genotype. In general, chemokine/cytokine networks analysis showed an overall profile of AA+GA-selective (CXCL9-CXCL10) and GG-selective (CXCL10-IL-6) axis regardless of the operational classification. However, mirrored inverted CCL2-IL-10 axis and a (IFN-γ-IL-2)-selective axis were identified in HHC(MB). CXCL8 presented outstanding performance to classify AA+AG from GG genotypes and HHC(PB) from HHC(MB). TNF and IL-17 presented elevated accuracy to classify AA+AG from GG genotypes and HHC(PB) (low levels) from HHC(MB) (high levels), respectively. Our results highlighted that both factors: i) differential exposure to M. leprae and ii) TLR4 rs1927914 genetic background impact the immune response of HHC. Our main results reinforce the relevance of integrated studies of immunological and genetic biomarkers that may have implications to improve the classification and monitoring of HHC in future studies.


Asunto(s)
Lepra , Mycobacterium leprae , Humanos , Interleucina-17 , Receptor Toll-Like 4/genética , Interleucina-6 , Citocinas , Lepra/genética , Inmunidad , Quimiocinas
3.
Mech Ageing Dev ; 207: 111713, 2022 10.
Artículo en Inglés | MEDLINE | ID: mdl-35931241

RESUMEN

Inflammaging is a low-grade inflammatory state generated by the aging process that can contribute to frailty and age-related diseases in the elderly. However, it can have distinct effects in the elderly living in endemic areas for infectious diseases. An increased inflammatory response may confer protection against infectious agents in these areas, although this advantage can cause accelerating epigenetic aging. In this study, we evaluated the inflammatory profile and the epigenetic age of infected and noninfected individuals from an endemic area in Brazil. The profile of cytokines, chemokines and growth factors analyzed in the sera of the two groups of individuals showed similarities, although infected individuals had a higher concentration of these mediators. A significant increase in IL-1ra, CXCL8, CCL2, CCL3 and CCL4 production was associated with leprosy infection. Notably, elderly individuals displayed distinct immune responses associated with their infection status when compared to adults suggesting an adaptive remodelling of their immune responses. Epigenetic analysis also showed that there was no difference in epigenetic age between the two groups of individuals. However, individuals from the endemic area had a significant accelerated aging when compared to individuals from São Paulo, a non-endemic area in Brazil. Moreover, the latter cohort was also epigenetically aged in relation to an Italian cohort. Our data shows that living in endemic areas for chronic infectious diseases results in remodelling of inflammaging and acceleration of epigenetic aging in individuals regardless of their infectious status. It also highlights that geographical, genetic and environmental factors influence aging and immunosenescence in their pace and profile.


Asunto(s)
Enfermedades Transmisibles , Proteína Antagonista del Receptor de Interleucina 1 , Anciano , Envejecimiento/genética , Brasil/epidemiología , Quimiocinas , Citocinas , Epigénesis Genética , Humanos
4.
Artículo en Inglés | MEDLINE | ID: mdl-31389369

RESUMEN

BACKGROUND: Psoriasis is a chronic inflammatory skin disease characterized by hyperproliferation and incomplete differentiation of epidermis, and accumulation of neutrophils and proinflammatory T cells in epidermis and dermis. Chemokines are believed to be the main players mediating the chemotaxis of leucocytes to the lesional site. Previous studies have established the role of various chemokine ligands and receptors at the lesional site in psoriasis. AIMS: In this study, we have compared the serum levels of various chemokines, namely, inducible protein-10 (IP-10) (CXCL10), MCP-1 (CCL-2), monokine induced by gamma interferon (MIG) (CXCL-9), RANTES (CCL5), interleukin (IL)-8, and eotaxin in patients with chronic plaque psoriasis with that of healthy controls. We also studied whether the chemokine levels varied within different patient groups based on various clinical and demographic parameters, and if any of these chemokines correlated with disease activity. METHODS: We studied 40 patients with chronic plaque psoriasis from a single center. Their clinical and demographic details were recorded in predesigned prforma. Patients with unstable forms of psoriasis like guttate, erythrodermic, or pustular psoriasis were excluded. The serum chemokine levels were measured by flow cytometry-based bead array set system. The serum levels of the patients were compared with that of 25 healthy controls. A subgroup analysis was also done to study the correlation of chemokine levels with age, sex, duration, and severity of disease. RESULTS: We observed a significant decrease in serum level of all these chemokines in patients, when compared with that of healthy controls. We also found that MIG levels showed a positive correlation with disease severity based on Psoriasis Area and Severity Index. LIMITATIONS: The major limitation of the study is lack of data on the lesional chemokine levels compared to serum chemokines. CONCLUSION: The inflammatory process in psoriasis is orchestrated through chemokines. MIG is a potential serum biomarker for assessing disease severity.


Asunto(s)
Quimiocinas/sangre , Psoriasis/sangre , Psoriasis/epidemiología , Índice de Severidad de la Enfermedad , Adulto , Anciano , Biomarcadores/sangre , Estudios de Casos y Controles , Femenino , Humanos , India/epidemiología , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Psoriasis/diagnóstico , Adulto Joven
5.
Microbiol Spectr ; 7(3)2019 05.
Artículo en Inglés | MEDLINE | ID: mdl-31172908

RESUMEN

Mycobacterium tuberculosis is an ancient master of the art of causing human disease. One important weapon within its fully loaded arsenal is the type VII secretion system. M. tuberculosis has five of them: ESAT-6 secretion systems (ESX) 1 to 5. ESX-1 has long been recognized as a major cause of attenuation of the FDA-licensed vaccine Mycobacterium bovis BCG, but its importance in disease progression and transmission has recently been elucidated in more detail. This review summarizes the recent advances in (i) the understanding of the ESX-1 structure and components, (ii) our knowledge of ESX-1's role in hijacking macrophage function to set a path for infection and dissemination, and (iii) the development of interventions that utilize ESX-1 for diagnosis, drug interventions, host-directed therapies, and vaccines.


Asunto(s)
Antígenos Bacterianos/inmunología , Proteínas Bacterianas/inmunología , Mycobacterium tuberculosis/inmunología , Mycobacterium tuberculosis/metabolismo , Tuberculosis/inmunología , Sistemas de Secreción Tipo VII/inmunología , Sistemas de Secreción Tipo VII/metabolismo , Vacuna BCG/inmunología , Sistemas de Secreción Bacterianos/metabolismo , Quimiocinas , Interacciones Huésped-Patógeno , Humanos , Macrófagos/inmunología , Mycobacterium tuberculosis/patogenicidad , Necrosis , Fagosomas , Tuberculosis/diagnóstico , Tuberculosis/tratamiento farmacológico , Tuberculosis/prevención & control , Vacunas , Virulencia
7.
Mem. Inst. Oswaldo Cruz ; 112(4): 260-268, Apr. 2017. tab, graf
Artículo en Inglés | LILACS | ID: biblio-841779

RESUMEN

BACKGROUND Leprosy or hansen’s disease is a spectral disease whose clinical forms mostly depends on host’s immune and genetic factors. Different Toll-like receptors (TLR) variants have been described associated with leprosy, but with some lack of replication across different populations. OBJECTIVES To evaluate the role of polymorphisms in genes TLR1, TLR2 and TLR4 and susceptibility to leprosy in a genetic case control study; to verify the association between genotypes of these markers and the immunological profile in the serum of patients with leprosy. METHODS Pre-designed TaqMan® assays were used to genotype markers at TLR1 (rs4833095, rs5743551), TLR2 (rs7656411, rs3804099) and TLR4 (rs1927914, rs1927911). A panel of cytokines and chemokines was accessed by enzime-linked immunosorbent assay (ELISA) test in the serum of a subgroup of patients with and without leprosy reactions. FINDINGS Our results show an association between the T allele of rs3804099 at the TLR2 gene and increased risk for leprosy per se [Odds ratio (OR) = 1.296, p = 0,022]. In addition, evaluating the association between different genotypes of the TLR1, 2 and 4 markers and cytokine/chemokine serological levels, IL-17 appears as an immunological marker regulated by the polymorphism of the three TLR genes evaluated, whereas different TLR1 genotypes were associated with differential production of IL-12p40 and MCP-1(CCL2). Furthermore, other relevant serum markers such as CXCL-10 and IL-6 seemed to be regulated by TLR2 variants and IL-1β was related to TLR4 genotypes. MAIN CONCLUSIONS All together our data points that the tested TLR markers may have a regulatory role in the immunity against Mycobacterium leprae, by driving the host’s production of key cytokines and chemokines involved in the pathogenesis of this disease.


Asunto(s)
Humanos , Masculino , Femenino , Adolescente , Adulto , Quimiocinas/inmunología , Quimiocinas/sangre , Receptor Toll-Like 1/genética , Receptor Toll-Like 2/genética , Receptor Toll-Like 4/genética , Lepra/genética , Lepra/inmunología , Estudios de Casos y Controles , Polimorfismo de Nucleótido Simple , Alelos , Ensayo de Immunospot Ligado a Enzimas , Genotipo
8.
Mem Inst Oswaldo Cruz ; 112(4): 260-268, 2017 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-28327786

RESUMEN

BACKGROUND: Leprosy or hansen's disease is a spectral disease whose clinical forms mostly depends on host's immune and genetic factors. Different Toll-like receptors (TLR) variants have been described associated with leprosy, but with some lack of replication across different populations. OBJECTIVES: To evaluate the role of polymorphisms in genes TLR1, TLR2 and TLR4 and susceptibility to leprosy in a genetic case control study; to verify the association between genotypes of these markers and the immunological profile in the serum of patients with leprosy. METHODS: Pre-designed TaqMan® assays were used to genotype markers at TLR1 (rs4833095, rs5743551), TLR2 (rs7656411, rs3804099) and TLR4 (rs1927914, rs1927911). A panel of cytokines and chemokines was accessed by enzime-linked immunosorbent assay (ELISA) test in the serum of a subgroup of patients with and without leprosy reactions. FINDINGS: Our results show an association between the T allele of rs3804099 at the TLR2 gene and increased risk for leprosy per se [Odds ratio (OR) = 1.296, p = 0,022]. In addition, evaluating the association between different genotypes of the TLR1, 2 and 4 markers and cytokine/chemokine serological levels, IL-17 appears as an immunological marker regulated by the polymorphism of the three TLR genes evaluated, whereas different TLR1 genotypes were associated with differential production of IL-12p40 and MCP-1(CCL2). Furthermore, other relevant serum markers such as CXCL-10 and IL-6 seemed to be regulated by TLR2 variants and IL-1ß was related to TLR4 genotypes. MAIN CONCLUSIONS: All together our data points that the tested TLR markers may have a regulatory role in the immunity against Mycobacterium leprae, by driving the host's production of key cytokines and chemokines involved in the pathogenesis of this disease.


Asunto(s)
Quimiocinas/sangre , Citocinas/sangre , Lepra/genética , Lepra/inmunología , Receptor Toll-Like 1/genética , Receptor Toll-Like 2/genética , Receptor Toll-Like 4/genética , Adolescente , Adulto , Alelos , Estudios de Casos y Controles , Quimiocinas/inmunología , Citocinas/inmunología , Ensayo de Immunospot Ligado a Enzimas , Femenino , Genotipo , Humanos , Masculino , Polimorfismo de Nucleótido Simple , Adulto Joven
9.
Salvador; s.n; 2014. 111 p. ilus, tab.
Tesis en Portugués | LILACS | ID: biblio-1000937

RESUMEN

A hanseníase ou mal de Hansen (MH), causada pelo patógeno Mycobacterium leprae, ainda constitui um problema de saúde pública no Brasil, e em especial no Maranhão. A doença é hiperendêmica em 77 municípios do Estado. A resposta imune ao patógeno de indivíduos dessas regiões permanece obscuro podendo contribuir na manutenção da hiperendemia. Por isso, este estudo teve por objetivo caracterizar o perfil clínico-epidemiológico e imunológico de pacientes infectados por M. leprae, e de seus contatos, procedentes de área hiperendêmica. Para o desenvolvimento deste trabalho foi realizado um estudo transversal foi realizado nos municípios de Açailândia, Imperatriz e São Luís, no período 2009 a 2012. Pacientes e contatos foram clinicamente avaliados e tiveram os dados epidemiológicos coletados. Uma amostra de sangue foi obtida para realização das sorologias para detecção de anticorpos IgM anti-PGL1 pelos testes de ELISA e ML-Flow, e dosagem de citocinas e quimiocinas. A análise descritiva demonstrou que a maioria dos pacientes eram adultos, do gênero masculino, diagnosticados principalmente com as formas intermediárias da doença (60%)...


Leprosy, caused by the pathogen Mycobacterium leprae, it is a public health problem in Brazil yet, especially in Maranhão. The disease is hyperendemic in 77 counties of the State. Immune response to the pathogen of individuals in these regions remains unclear and may be contributing to maintenance of high endemicity. Therefore, this study aimed to characterize epidemiological and immunological profile of patients infected with M. leprae, and their contacts, from hyperendemic regions. Cross-sectional study was accomplished in Açailândia, Imperatriz and São Luís counties, 2009-2012. Patients and contacts were clinically evaluated and had their epidemiological data collected. A blood sample was obtained for performing serological tests IgM anti-PGL1 detection by ELISA and ML-Flow and measurement of cytokines and chemokines. Descriptive analysis showed that most patients were adults, male, diagnosed with intermediate forms mainly (60%)...


Asunto(s)
Adulto , Citocinas/análisis , Citocinas/sangre , Epidemiología/estadística & datos numéricos , Lepra/transmisión , Quimiocinas , Quimiocinas/análisis , Quimiocinas/sangre , Quimiocinas/síntesis química , Serología/estadística & datos numéricos , Serología/métodos
10.
PLoS One ; 8(6): e64748, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-23798993

RESUMEN

Herein, we performed microarray experiments in Schwann cells infected with live M. leprae and identified novel differentially expressed genes (DEG) in M. leprae infected cells. Also, we selected candidate genes associated or implicated with leprosy in genetic studies and biological experiments. Forty-seven genes were selected for validation in two independent types of samples by multiplex qPCR. First, an in vitro model using THP-1 cells was infected with live Mycobacterium leprae and M. bovis bacillus Calmette-Guérin (BCG). In a second situation, mRNA obtained from nerve biopsies from patients with leprosy or other peripheral neuropathies was tested. We detected DEGs that discriminate M. bovis BCG from M. leprae infection. Specific signatures of susceptible responses after M. leprae infection when compared to BCG lead to repression of genes, including CCL2, CCL3, IL8 and SOD2. The same 47-gene set was screened in nerve biopsies, which corroborated the down-regulation of CCL2 and CCL3 in leprosy, but also evidenced the down-regulation of genes involved in mitochondrial metabolism, and the up-regulation of genes involved in lipid metabolism and ubiquitination. Finally, a gene expression signature from DEG was identified in patients confirmed of having leprosy. A classification tree was able to ascertain 80% of the cases as leprosy or non-leprous peripheral neuropathy based on the expression of only LDLR and CCL4. A general immune and mitochondrial hypo-responsive state occurs in response to M. leprae infection. Also, the most important genes and pathways have been highlighted providing new tools for early diagnosis and treatment of leprosy.


Asunto(s)
Quimiocinas/metabolismo , Lepra/metabolismo , Metabolismo de los Lípidos , Mitocondrias/metabolismo , Transcriptoma , Células Cultivadas , Quimiocinas/genética , Análisis por Conglomerados , Femenino , Perfilación de la Expresión Génica , Regulación de la Expresión Génica/inmunología , Interacciones Huésped-Patógeno , Humanos , Lepra/inmunología , Lepra/microbiología , Masculino , Mitocondrias/microbiología , Mycobacterium bovis/inmunología , Mycobacterium leprae/inmunología , Análisis de Secuencia por Matrices de Oligonucleótidos , Nervios Periféricos/metabolismo , Células de Schwann/inmunología , Células de Schwann/metabolismo , Células de Schwann/microbiología
11.
s.l; s.n; 2013. 11 p. ilus, graf.
No convencional en Inglés | Sec. Est. Saúde SP, HANSEN, Hanseníase, SESSP-ILSLPROD, Sec. Est. Saúde SP, SESSP-ILSLACERVO, Sec. Est. Saúde SP | ID: biblio-1095732

RESUMEN

Herein, we performed microarray experiments in Schwann cells infected with live M. leprae and identified novel differentially expressed genes (DEG) in M. leprae infected cells. Also, we selected candidate genes associated or implicated with leprosy in genetic studies and biological experiments. Forty-seven genes were selected for validation in two independent types of samples by multiplex qPCR. First, an in vitro model using THP-1 cells was infected with live Mycobacterium leprae and M. bovis bacillus Calmette-Guérin (BCG). In a second situation, mRNA obtained from nerve biopsies from patients with leprosy or other peripheral neuropathies was tested. We detected DEGs that discriminate M. bovis BCG from M. leprae infection. Specific signatures of susceptible responses after M. leprae infection when compared to BCG lead to repression of genes, including CCL2, CCL3, IL8 and SOD2. The same 47-gene set was screened in nerve biopsies, which corroborated the down-regulation of CCL2 and CCL3 in leprosy, but also evidenced the down-regulation of genes involved in mitochondrial metabolism, and the up-regulation of genes involved in lipid metabolism and ubiquitination. Finally, a gene expression signature from DEG was identified in patients confirmed of having leprosy. A classification tree was able to ascertain 80% of the cases as leprosy or non-leprous peripheral neuropathy based on the expression of only LDLR and CCL4. A general immune and mitochondrial hypo-responsive state occurs in response to M. leprae infection. Also, the most important genes and pathways have been highlighted providing new tools for early diagnosis and treatment of leprosy.


Asunto(s)
Masculino , Femenino , Células Cultivadas , Regulación de la Expresión Génica/inmunología , Quimiocinas/metabolismo , Perfilación de la Expresión Génica , Lepra/inmunología , Lepra/metabolismo , Lepra/microbiología , Mitocondrias/metabolismo , Mitocondrias/microbiología , Mycobacterium bovis/inmunología , Mycobacterium leprae/inmunología , Nervios Periféricos/metabolismo , Células de Schwann/inmunología , Células de Schwann/metabolismo , Análisis por Conglomerados , Quimiocinas/genética , Análisis de Secuencia por Matrices de Oligonucleótidos , Metabolismo de los Lípidos , Interacciones Huésped-Patógeno , Transcriptoma
12.
J Interferon Cytokine Res ; 32(1): 27-33, 2012 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-21981546

RESUMEN

Leprosy is a chronic but treatable infectious disease caused by the intracellular pathogen Mycobacterium leprae. M. leprae cell wall is characterized by a unique phenolic glycolipid-1 (PGL-1) reported to have several immune functions. We have examined the role of PGL-1 in the modulation of monocyte cytokine/chemokine production in naive human monocytes. PGL-1 in its purified form or expressed in a recombinant Mycobacterium bovis Bacillus Colmette-Guérin (BCG) background (rBCG-PGL-1) was tested. We found that PGL-1 selectively modulated the induction of specific monocyte cytokines and chemokines and, when used as prestimulus, exerted priming and/or inhibitory effects on the induction of selected cytokines/chemokines in response to a second stimulus. Taken together, the results of this study support a modulatory role for PGL-1 in the innate immune response to M. leprae. Thus, PGL-1 may play an important role in the development of the anergic clinical forms of disease and in tissue damage seen in lepromatous patients and during the reactional states of leprosy.


Asunto(s)
Antígenos Bacterianos/inmunología , Citocinas/biosíntesis , Glucolípidos/inmunología , Monocitos/inmunología , Quimiocinas/biosíntesis , Quimiocinas/inmunología , Humanos , Inmunidad Innata , Monocitos/metabolismo , Mycobacterium bovis/inmunología , Mycobacterium leprae/inmunología
13.
Acta Trop ; 113(2): 151-4, 2010 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-19874796

RESUMEN

Leprosy, whose etiologic agent is Mycobacterium leprae, is an illness of ample clinical and immunopathological spectrum. Although chemokines seem to be involved in the immunopathogenesis of leprosis, few studies have been carried out to unveil the potential of chemokines as biological markers of the disease. The purpose of this study was to investigate the value of measuring CCL2, CCL3, CCL11 and CCL24 in plasma of patients with leprosy (LE) at different stages of multi-drug therapy (MDT). Chemokines were measured by ELISA in plasma of 30 non-infected individuals (NI) and 33 LE patients before and at different stages of treatment. The plasma concentration of CCL11 (p<0.01) and CCL24 (p<0.05) was increased in LE patients before treatment when compared to NI individuals. The plasma concentration of CCL24 decreased after MDT (p<0.05). No differences were observed in the concentration of CCL2 and CCL3 in plasma of NI and LE individuals. The elevated levels of CCL11 and CCL24 in plasma of patients with LE suggest that these chemokines may play a role in disease pathogenesis. Moreover, the decrease of CCL24 after treatment suggests that this chemokine might be useful as a biomarker of response to MDT in patients with leprosy.


Asunto(s)
Quimiocinas/sangre , Leprostáticos/uso terapéutico , Lepra/tratamiento farmacológico , Mycobacterium leprae/efectos de los fármacos , Adulto , Anciano , Quimiocina CCL11/sangre , Quimiocina CCL24/sangre , Clofazimina/uso terapéutico , Dapsona/uso terapéutico , Quimioterapia Combinada , Femenino , Humanos , Laboratorios , Lepra/inmunología , Lepra/microbiología , Lepra/fisiopatología , Masculino , Persona de Mediana Edad , Mycobacterium leprae/inmunología , Rifampin/uso terapéutico , Resultado del Tratamiento
14.
Microbes Infect ; 11(14-15): 1122-30, 2009 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-19703581

RESUMEN

Delayed Type Hypersensitivity (DTH) and protective immunity are thought to be tightly linked. Remarkable similarity exists between their cellular and immune mechanisms. However, their dissociation is also well known. Here we investigate the immunological mechanisms relevant for their dissociation in a group of non-relapsing cured lepromatous leprosy (CLL) patients. In these patients, using lepromin reaction as a model system of DTH we report critical role of tissue chemokine response in synchronous manifestation of these linked phenomena. Results indicate elevation of the threshold of tissue chemokine induction thus dissociating DTH from protective immunity in lepromin -ive CLL patients. We also show that the DTH anergy in these subjects is not an absolute one but depends on the strength of the stimulus. Our data provide insights into the intricate relationship between DTH and immunity and highlight the persistent presence of effector immune mechanisms involving these two pathways in apparently unresponsive lepromatous leprosy patients.


Asunto(s)
Quimiocinas/inmunología , Hipersensibilidad Tardía/inmunología , Lepromina/inmunología , Lepra Lepromatosa/inmunología , Linfocitos T/inmunología , Quimiocinas/metabolismo , Humanos , Inmunidad/inmunología , Lepra Lepromatosa/microbiología , Activación de Linfocitos , Mycobacterium leprae/inmunología
15.
Clin Exp Immunol ; 134(3): 447-53, 2003 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-14632750

RESUMEN

We have investigated the expression of chemokines and their receptors in leprosy skin lesions using immunohistochemistry. Skin biopsies from 25 leprosy patients across the leprosy spectrum, 11 patients undergoing type I reversal reactions and four normal donors were immunostained by ABC peroxidase method using antibodies against CC and CXC chemokines and their receptors. Using an in situ hybridization technique we have also studied the expression of monocyte chemoattractant protein 1 (MCP-1), RANTES and interleukin (IL)-8 chemokines mRNA in leprosy skin lesions. Chemokines and receptor expression was detected in all leprosy skin biopsies. Expression of CC chemokines MCP-1 (P < 0.01) and RANTES (P < 0.01) were elevated significantly in borderline tuberculoid leprosy in reversal reaction compared to non-reactional borderline tuberculoid leprosy, but there was no difference in the expression of IL-8 chemokine. Surprisingly, there was no significant difference in the expression of CC (CCR2 and CCR5) and CXC (CXCR2) chemokine receptors across the leprosy spectrum. Similarly, there was no significant difference in the expression of mRNA for MCP-1, regulated upon activation normal T cell expressed and secreted (RANTES) and IL-8 chemokines. Here, the presence of a neutrophil chemoattractant IL-8 in leprosy lesions, which do not contain neutrophils, suggests strongly a role of IL-8 as a monocyte and lymphocyte recruiter in leprosy lesions. These results suggest that the chemokines and their receptors, which are known to chemoattract T lymphocytes and macrophages, are involved in assembling the cellular infiltrate found in lesions across the leprosy spectrum.


Asunto(s)
Quimiocinas/análisis , Lepra/inmunología , Receptores de Quimiocina/análisis , Piel/inmunología , Linfocitos T CD4-Positivos/inmunología , Linfocitos T CD8-positivos/inmunología , Quimiocina CCL2/genética , Quimiocina CCL5/genética , Quimiocinas/genética , Humanos , Inmunohistoquímica/métodos , Hibridación in Situ/métodos , Interleucina-8/genética , Macrófagos/inmunología , ARN Mensajero/análisis , Receptores CCR2 , Receptores CCR5/análisis , Receptores de Quimiocina/genética , Receptores de Interleucina-8B/análisis , Estadísticas no Paramétricas
16.
s.l; s.n; 2003. 7 p. ilus, tab, graf.
No convencional en Inglés | Sec. Est. Saúde SP, HANSEN, Hanseníase, SESSP-ILSLACERVO, Sec. Est. Saúde SP | ID: biblio-1241405

RESUMEN

We have investigated the expression of chemokines and their receptors in leprosy skin lesions using immunohistochemistry. Skin biopsies from 25 leprosy patients across the leprosy spectrum, 11 patients undergoing type I reversal reactions and four normal donors were immunostained by ABC peroxidase method using antibodies against CC and CXC chemokines and their receptors. Using an in situ hybridization technique we have also studied the expression of monocyte chemoattractant protein 1 (MCP-1), RANTES and interleukin (IL)-8 chemokines mRNA in leprosy skin lesions. Chemokines and receptor expression was detected in all leprosy skin biopsies. Expression of CC chemokines MCP-1 (P < 0.01) and RANTES (P < 0.01) were elevated significantly in borderline tuberculoid leprosy in reversal reaction compared to non-reactional borderline tuberculoid leprosy, but there was no difference in the expression of IL-8 chemokine. Surprisingly, there was no significant difference in the expression of CC (CCR2 and CCR5) and CXC (CXCR2) chemokine receptors across the leprosy spectrum. Similarly, there was no significant difference in the expression of mRNA for MCP-1, regulated upon activation normal T cell expressed and secreted (RANTES) and IL-8 chemokines. Here, the presence of a neutrophil chemoattractant IL-8 in leprosy lesions, which do not contain neutrophils, suggests strongly a role of IL-8 as a monocyte and lymphocyte recruiter in leprosy lesions. These results suggest that the chemokines and their receptors, which are known to chemoattract T lymphocytes and macrophages, are involved in assembling the cellular infiltrate found in lesions across the leprosy spectrum.


Asunto(s)
Humanos , Lepra , Hibridación in Situ , Inmunohistoquímica , Macrófagos , Quimiocinas , ARN Mensajero , Receptores de Quimiocina
17.
Nova Iorque; Kluwer Academic / Plenum Publishers; 2003. 295 p. ilus, tab, graf.
Monografía en Inglés | LILACS, HANSEN, Hanseníase, SESSP-ILSLACERVO, Sec. Est. Saúde SP | ID: biblio-1083185
20.
J Immunol ; 156(11): 4345-53, 1996 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-8666806

RESUMEN

Immunomodulatory cytokines have been used with success as adjunctive therapy in genetic disorders such as chronic granulomatous disease and infectious diseases such as leishmaniasis and leprosy. As the first step toward developing novel methods to deliver immunomodulatory cytokines, we used retrovirus-mediated somatic gene transfer techniques to produce IFN-gamma from human peripheral blood CD34+ hemopoietic progenitor (PBHP) cells. After transduction, the PBHP cells were made to differentiate toward myelo-monocytic lineages. Only the PBHP-derived myelo-monocytic cells that were transduced with the IFN-gamma cDNA produced IFN-gamma(4 +/- 1.3 ng of IFN-gamma/10(6) PBHP cells.) Despite a reduction in the proliferation of IFN-gamma-transduced PBHP cells as well as a decrease in erythroid colony formation, there was an enhancement of monocyte differentiation and activation. Monocytes differentiated from the IFN-gamma-transduced PBHP cells demonstrated 1) up-regulation of MHC class I and II Ag expression, 2) increased Fc(gamma)RI expression, and 3) enhanced superoxide production in response to both opsonized zymosan (25-fold) and phorbol ester (3-fold). Furthermore, a functional response to a monocyte-specific chemokine, monocyte chemotactic protein-1 (mobilization of intracellular Ca2+) was seen only in the IFN-gamma-transduced cells. Thus, PBHP cells transduced with IFN-gamma cDNA produce not only biologically active IFN-gamma, but also enhanced monocyte differentiation, resulting in an activated state that includes unique functions, such as responsiveness to monocyte chemotactic protein-1. These transduced activated monocytes may be specifically suited to cellular therapy requiring homing to sites of inflammation where their anti- microbicidal, cytotoxic and APC functions play an important role in host defense against foreign pathogens.


Asunto(s)
Células Madre Hematopoyéticas/inmunología , Interferón gamma/genética , Monocitos/inmunología , Células 3T3 , Animales , Diferenciación Celular , Quimiocinas/metabolismo , Ensayo de Unidades Formadoras de Colonias , Técnicas de Transferencia de Gen , Genes MHC Clase I , Genes MHC Clase II , Hematopoyesis , Células Madre Hematopoyéticas/citología , Células Madre Hematopoyéticas/metabolismo , Humanos , Técnicas In Vitro , Interferón gamma/biosíntesis , Ratones , Monocitos/citología , Monocitos/metabolismo , Proteínas Opsoninas/metabolismo , Receptores de Citocinas/metabolismo , Superóxidos/metabolismo , Transducción Genética , Factor de Necrosis Tumoral alfa/biosíntesis , Regulación hacia Arriba
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