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https://www.readbyqxmd.com/read/28636650/the-formation-of-lipid-droplets-favors-intracellular-mycobacterium-leprae-survival-in-sw-10-non-myelinating-schwann-cells
#1
Song-Hyo Jin, Sung-Kwan An, Seong-Beom Lee
Leprosy is a chronic infectious disease that is caused by the obligate intracellular pathogen Mycobacterium leprae (M.leprae), which is the leading cause of all non-traumatic peripheral neuropathies worldwide. Although both myelinating and non-myelinating Schwann cells are infected by M.leprae in patients with lepromatous leprosy, M.leprae preferentially invades the non-myelinating Schwann cells. However, the effect of M.leprae infection on non-myelinating Schwann cells has not been elucidated. Lipid droplets (LDs) are found in M...
June 21, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28633333/anti-natural-octyl-disaccharide-leprosy-idri-diagnostic-ndo-lid-antibodies-as-indicators-of-leprosy-reactions-and-neuritis
#2
Héctor Serrano-Coll, Mónica Muñoz, Juan Camilo Beltrán, Malcolm S Duthie, Nora Cardona-Castro
Background: Leprosy is a complex infectious and neurological disease caused by Mycobacterium leprae. Nerve damage is related to immunological hypersensitivity responses known as leprosy reactions (LRs). Diagnostic tools to predict LRs are not available. We hypothesized that natural octyl disaccharide-leprosy IDRI diagnostic (NDO-LID) would be helpful as an indicator of LRs and neuritis. Methods: To assess the utility of NDO-LID in indicating reactions, ELISA were used to detect specific antibodies in serum samples from 80 Colombian leprosy patients (40 with and 40 without history of LRs)...
March 1, 2017: Transactions of the Royal Society of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28617800/whole-genome-sequencing-distinguishes-between-relapse-and-reinfection-in-recurrent-leprosy-cases
#3
Mariane M A Stefani, Charlotte Avanzi, Samira Bührer-Sékula, Andrej Benjak, Chloé Loiseau, Pushpendra Singh, Maria A A Pontes, Heitor S Gonçalves, Emerith M Hungria, Philippe Busso, Jérémie Piton, Maria I S Silveira, Rossilene Cruz, Antônio Schetinni, Maurício B Costa, Marcos C L Virmond, Suzana M Diorio, Ida M F Dias-Baptista, Patricia S Rosa, Masanori Matsuoka, Maria L F Penna, Stewart T Cole, Gerson O Penna
BACKGROUND: Since leprosy is both treated and controlled by multidrug therapy (MDT) it is important to monitor recurrent cases for drug resistance and to distinguish between relapse and reinfection as a means of assessing therapeutic efficacy. All three objectives can be reached with single nucleotide resolution using next generation sequencing and bioinformatics analysis of Mycobacterium leprae DNA present in human skin. METHODOLOGY: DNA was isolated by means of optimized extraction and enrichment methods from samples from three recurrent cases in leprosy patients participating in an open-label, randomized, controlled clinical trial of uniform MDT in Brazil (U-MDT/CT-BR)...
June 15, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28602616/salivary-anti-pgl-1-igm-may-indicate-active-transmission-of-mycobacterium-leprae-among-young-people-under-16-years-of-age
#4
Alexandre Casimiro de Macedo, José Evandro Cunha, Juliana Navarro Ueda Yaochite, Clodis Maria Tavares, Aparecida Tiemi Nagao-Dias
Considering that the main route of Mycobacterium leprae transmission is the upper respiratory tract, detection of salivary antibodies can be a useful tool for diagnosing early infection. The study aimed to analyze salivary anti-PGL-1 IgA and IgM antibodies in 169 children aged 4-16 years old, who lived nearby or inside the house of multibacillary or paucibacillary leprosy patients in two endemic cities in Alagoas State - Brazil. Salivary anti-PGL-1 antibodies were quantified by modified ELISA method. The frequency of contact and clinical form of the index case were significantly associated with salivary antibodies levels...
June 8, 2017: Brazilian Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28584985/dnahsp65-vaccine-as-therapy-against-paracoccidioidomycosis
#5
Alice M Ribeiro, André C Amaral, Maria Sueli S Felipe, Anamelia L Bocca
The conventional treatment for fungal diseases usually shows long periods of therapy and the high frequency of relapses and sequels. New strategies of the treatment are necessary. We have shown that the Mycobacterium leprae HSP65 gene can be successfully used as therapy against murine Paracoccidioidomycosis (PCM). Here, we described the methodology of DNAhsp65 immunotherapy in mice infected with the dimorphic fungus Paracoccidioides brasiliensis, one of PCM agent, evaluating cytokines levels, fungal burden, and lung injury...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28571290/leprosy-in-an-eight-year-old-child-an-exceptional-case-with-unusual-oral-manifestation
#6
Mayuri Jain
Leprosy is a contagious and granulomatous disease which is caused by Mycobacterium leprae. The incubation period for leprosy is five to seven years and it can take as long as about 30 years before signs and symptoms of leprosy develop in some patients. It is a chronic systemic disease which mostly affects the skin and peripheral nerves. It has been seen that indeterminate leprosy is the most common type seen in childhood followed by tuberculoid variant. Borderline lepromatous and lepromatous leprosy are only occasionally encountered in children and rarely affects the oral cavity...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28570932/cytokines-as-biomarkers-to-monitoring-the-impact-of-multidrug-therapy-in-immune-response-of-leprosy-patients
#7
Fábio Cassirer-Costa, Nayara I Medeiros, Ana T Chaves, Sandra Lyon, Jordana G A Coelho-Dos-Reis, Atvaldo F Ribeiro-Junior, Rodrigo Correa-Oliveira, Manoel O C Rocha, Juliana A S Gomes
Leprosy or Hansen's disease is a chronic infectious disease of the skin and nerves, caused by the intracellular bacilli Mycobacterium leprae. It is characterized by a spectrum of clinical forms depending on the host's immune response to M. leprae. Patients with tuberculoid (TT) leprosy have strong cell-mediated immunity (CMI) with elimination of the bacilli, whereas patients with lepromatous (LL) leprosy exhibit defective CMI to M. leprae. Despite advances in the understanding of the pathogenesis of leprosy and the development of new therapeutic strategies, there is a need for the identification of biomarkers which be used for early diagnosis and to discrimination between different forms of the disease, as prognostic markers...
May 29, 2017: Cytokine
https://www.readbyqxmd.com/read/28570560/qpcr-high-resolution-melt-analysis-for-drug-susceptibility-testing-of-mycobacterium-leprae-directly-from-clinical-specimens-of-leprosy-patients
#8
Sergio Araujo, Luiz Ricardo Goulart, Richard W Truman, Isabela Maria B Goulart, Varalakshmi Vissa, Wei Li, Masanori Matsuoka, Philip Suffys, Amanda B Fontes, Patricia S Rosa, David M Scollard, Diana L Williams
BACKGROUND: Real-Time PCR-High Resolution Melting (qPCR-HRM) analysis has been recently described for rapid drug susceptibility testing (DST) of Mycobacterium leprae. The purpose of the current study was to further evaluate the validity, reliability, and accuracy of this assay for M. leprae DST in clinical specimens. METHODOLOGY/PRINCIPAL FINDINGS: The specificity and sensitivity for determining the presence and susceptibility of M. leprae to dapsone based on the folP1 drug resistance determining region (DRDR), rifampin (rpoB DRDR) and ofloxacin (gyrA DRDR) was evaluated using 211 clinical specimens from leprosy patients, including 156 multibacillary (MB) and 55 paucibacillary (PB) cases...
June 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28562758/presence-of-mycobacterium-leprae-genotype-4-in-environmental-waters-in-northeast-brazil
#9
Maísa Viana de Holanda, Livia Erika Carlos Marques, Maria Luisa Bezerra de Macedo, Maria Araci de Andrade Pontes, José Antonio Beltrão Sabadia, Ligia Regina Franco Sansigolo Kerr, Rosa Lívia Freitas Almeida, Cristiane Cunha Frota
INTRODUCTION: This study quantified Mycobacterium leprae bacilli in environmental water samples from five municipalities in the State of Ceará by quantitative polymerase chain reaction (qPCR) and compared the identified genotypes with those obtained from leprosy patient biopsies. METHODS: We collected five replicas from each of the 30 selected reservoirs and skin lesion biopsies from 25 new leprosy cases treated at a reference center in Fortaleza, Ceará from 2010 to 2013...
March 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28530057/-hansen-s-disease-in-israel
#10
REVIEW
Leon Gilead, Ruth Wexler
Hansen's disease (HD) is an anthropophylic, infectious, chronic disease, caused by Mycobacterium leprae. The systemic disease, affecting both males and females at any age, involves mainly the skin and the peripheral nerves located in the limbs close to the skin. Traditionally the treatment of HD patients was entrusted to dermatologists. Current drug therapy given at an early stage can prevent many of the complications, and enables patients to go on with life. In 95% of the population there is an innate immunity, which following exposure, enables the development of an effective immune response preventing the development of overt clinical disease...
October 2016: Harefuah
https://www.readbyqxmd.com/read/28514659/the-intergenic-recombinant-hla-b%C3%A2-46-01-has-a-distinctive-peptidome-that-includes-kir2dl3-ligands
#11
Hugo G Hilton, Curtis P McMurtrey, Alex S Han, Zakia Djaoud, Lisbeth A Guethlein, Jeroen H Blokhuis, Jason L Pugh, Ana Goyos, Amir Horowitz, Rico Buchli, Ken W Jackson, Wilfred Bardet, David A Bushnell, Philip J Robinson, Juan L Mendoza, Michael E Birnbaum, Morten Nielsen, K Christopher Garcia, William H Hildebrand, Peter Parham
HLA-B(∗)46:01 was formed by an intergenic mini-conversion, between HLA-B(∗)15:01 and HLA-C(∗)01:02, in Southeast Asia during the last 50,000 years, and it has since become the most common HLA-B allele in the region. A functional effect of the mini-conversion was introduction of the C1 epitope into HLA-B(∗)46:01, making it an exceptional HLA-B allotype that is recognized by the C1-specific natural killer (NK) cell receptor KIR2DL3. High-resolution mass spectrometry showed that HLA-B(∗)46:01 has a low-diversity peptidome that is distinct from those of its parents...
May 16, 2017: Cell Reports
https://www.readbyqxmd.com/read/28505186/in-situ-complement-activation-and-t-cell-immunity-in-leprosy-spectrum-an-immunohistological-study-on-leprosy-lesional-skin
#12
Nawal Bahia El Idrissi, Anand M Iyer, Valeria Ramaglia, Patricia S Rosa, Cleverson T Soares, Frank Baas, Pranab K Das
Mycobacterium leprae (M. leprae) infection causes nerve damage and the condition worsens often during and long after treatment. Clearance of bacterial antigens including lipoarabinomannan (LAM) during and after treatment in leprosy patients is slow. We previously demonstrated that M. leprae LAM damages peripheral nerves by in situ generation of the membrane attack complex (MAC). Investigating the role of complement activation in skin lesions of leprosy patients might provide insight into the dynamics of in situ immune reactivity and the destructive pathology of M...
2017: PloS One
https://www.readbyqxmd.com/read/28467415/interruption-of-persistent-exposure-to-leprosy-combined-or-not-with-recent-bcg-vaccination-enhances-the-response-to-mycobacterium-leprae-specific-antigens
#13
Fernanda Marques de Carvalho, Luciana Silva Rodrigues, Nádia Cristina Duppre, Iris Maria Peixoto Alvim, Marcelo Ribeiro-Alves, Roberta Olmo Pinheiro, Euzenir Nunes Sarno, Maria Cristina Vidal Pessolani, Geraldo Moura Batista Pereira
Household contacts of multibacillary leprosy patients (HCMB) constitute the group of individuals at the highest risk of developing leprosy. Early diagnosis and treatment of their index cases combined with Bacille Calmette-Guerin (BCG) immunization remain important strategies adopted in Brazil to prevent HCMB from evolving into active disease. In the present study, we assessed the impact of these measures on the immune response to Mycobacterium leprae in HCMB. Peripheral blood mononuclear cells (PBMC) from HCMB (n = 16) were obtained at the beginning of leprosy index case treatment (T0)...
May 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28438129/severe-type-1-upgrading-leprosy-reaction-in-a-renal-transplant-recipient-a-paradoxical-manifestation-associated-with-deficiency-of-antigen-specific-regulatory-t-cells
#14
Ana Paula Vieira, Maria Angela Bianconcini Trindade, Flávio Jota de Paula, Neusa Yurico Sakai-Valente, Alberto José da Silva Duarte, Francine Brambate Carvalhinho Lemos, Gil Benard
BACKGROUND: Due to its chronic subclinical course and large spectrum of manifestations, leprosy often represents a diagnostic challenge. Even with proper anti-mycobacteria treatment, leprosy follow up remains challenging: almost half of leprosy patients may develop reaction episodes. Leprosy is an infrequent complication of solid organ transplant recipients. This case report illustrates the challenges in diagnosing and managing leprosy and its reactional states in a transplant recipient...
April 24, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28426172/distinct-roles-of-th17-and-th1-cells-in-inflammatory-responses-associated-with-the-presentation-of-paucibacillary-leprosy-and-leprosy-reactions-th17-immune-response-in-leprosy
#15
Márcio Bezerrra Santos, Daniela Teles de Oliveira, Rodrigo Anselmo Cazzaniga, Crisuelle Santana Varjão, Priscila Lima Dos Santos, Micheli L B Santos, Cristiane Bane Correia, Daniela R Faria, Marise do Vale Simon, João Santana Silva, Walderez O Dutra, Steven G Reed, Malcolm S Duthie, Roque Pahceco de Almeida, Amélia Ribeiro de Jesus
It is well established that helper T cell responses influence resistance or susceptibility to Mycobacterium leprae infection, but the role of more recently described helper T cell subsets in determining severity is less clear. To investigate the involvement of Th17 cells in the pathogenesis of leprosy, we determined the immune profile with variant presentations of leprosy. Firstly, IL-17A, IFN-γ and IL-10 were evaluated in conjunction with CD4(+) T cell staining by confocal microscopy of lesion biopsies from tuberculoid (TT) and lepromatous (LL) patients...
April 20, 2017: Scandinavian Journal of Immunology
https://www.readbyqxmd.com/read/28419120/structural-and-functional-changes-in-the-microcirculation-of-lepromatous-leprosy-patients-observation-using-orthogonal-polarization-spectral-imaging-and-laser-doppler-flowmetry-iontophoresis
#16
Curt Treu, Maria das Graças Coelho de Souza, Omar Lupi, Fernando Lencastre Sicuro, Priscila Alves Maranhão, Luiz Guilherme Kraemer-Aguiar, Eliete Bouskela
Leprosy is a chronic granulomatous infection of skin and peripheral nerves caused by Mycobacterium leprae and is considered the main infectious cause of disability worldwide. Despite the several studies regarding leprosy, little is known about its effects on microvascular structure and function in vivo. Thus, we have aimed to compare skin capillary structure and functional density, cutaneous vasomotion (spontaneous oscillations of arteriolar diameter), which ensures optimal blood flow distribution to skin capillaries) and cutaneous microvascular blood flow and reactivity between ten men with lepromatous leprosy (without any other comorbidity) and ten age- and gender-matched healthy controls...
2017: PloS One
https://www.readbyqxmd.com/read/28417702/quinolone-resistance-associated-amino-acid-substitutions-affect-enzymatic-activity-of-mycobacterium-leprae-dna-gyrase
#17
Tomoyuki Yamaguchi, Kazumasa Yokoyama, Chie Nakajima, Yasuhiko Suzuki
Quinolones are important antimicrobials for treatment of leprosy, a chronic infectious disease caused by Mycobacterium leprae. Although it is well known that mutations in DNA gyrase are responsible for quinolone resistance, the effect of those mutations on the enzymatic activity is yet to be studied in depth. Hence, we conducted in vitro assays to observe supercoiling reactions of wild type and mutated M. leprae DNA gyrases. DNA gyrase with amino acid substitution Ala91Val possessed the highest activity among the mutants...
July 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28411775/comparing-the-sensitivity-of-auramine-rhodamine-fluorescence-to-polymerase-chain-reaction-in-the-detection-of-mycobacterium-leprae-in-fite-negative-tissue-sections
#18
Dirk M Elston, Maritza O Liranzo, David M Scollard
No abstract text is available yet for this article.
May 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28355218/scd163-levels-as-a-biomarker-of-disease-severity-in-leprosy-and-visceral-leishmaniasis
#19
Ricardo Luís Louzada Silva, Marcio B Santos, Priscila L S Almeida, Thayse S Barros, Lucas Magalhães, Rodrigo A Cazzaniga, Patrícia R M Souza, Nívea F Luz, Jaqueline França-Costa, Valeria M Borges, Djalma S Lima-Junior, Michael W Lipscomb, Malcolm S Duthie, Steven G Reed, Roque Pacheco Almeida, Amélia Ribeiro Jesus
BACKGROUND: CD163, receptor for the haptoglobin-hemoglobin complex, is expressed on monocytes/macrophages and neutrophils. A soluble form of CD163 (sCD163) has been associated with the M2 macrophage phenotype, and M2 macrophages have been shown to down-modulate inflammatory responses. In particular, previous studies have shown that M2 is closely associated with the most severe clinical presentation of leprosy (i.e. lepromatous leprosy (LL)), as well as tuberculosis. We hypothesized that sCD163 correlates with severity of diseases caused by intracellular pathogens...
March 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28351089/leptin-and-its-receptors-in-human-placenta-of-small-adequate-and-large-for-gestational-age-newborns
#20
Maria-Luisa Lazo-de-la-Vega-Monroy, Martha I González-Domínguez, Silvio Zaina, Myrna Sabanero, Leonel Daza-Benítez, Juan Manuel Malacara, Gloria Barbosa-Sabanero
Alterations in birth weight impact postnatal outcome and adult metabolic health. Therefore, fetal growth regulation is crucial for preventing chronic metabolic diseases. Leptin has been suggested to play an important role in placental and fetal growth, albeit its specific mechanisms of action have not been elucidated. The aim of this study was to analyze leptin concentrations in placenta, cord blood, and maternal blood of SGA, AGA, and LGA (small, adequate and large for gestational age, respectively) newborns, as well as placental leptin receptor (LEPRa and LEPRb) protein expression...
May 2017: Hormone and Metabolic Research, Hormon- und Stoffwechselforschung, Hormones et Métabolisme
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