Dataset Information

Iron trafficking in patients with Indian Post kala-azar dermal leishmaniasis.

ABSTRACT: BACKGROUND:During infections involving intracellular pathogens, iron performs a double-edged function by providing the pathogen with nutrients, but also boosts the host's antimicrobial arsenal. Although the role of iron has been described in visceral leishmaniasis, information regarding its status in the dermal sequel, Post Kala-azar Dermal Leishmaniasis (PKDL) remains limited. Accordingly, this study aimed to establish the status of iron within monocytes/macrophages of PKDL cases. METHODOLOGY/PRINCIPAL FINDINGS:The intramonocytic labile iron pool (LIP), status of CD163 (hemoglobin-haptoglobin scavenging receptor) and CD71 (transferrin receptor, Tfr) were evaluated within CD14+ monocytes by flow cytometry, and soluble CD163 by ELISA. At the lesional sites, Fe3+ status was evaluated by Prussian blue staining, parasite load by qPCR, while the mRNA expression of Tfr (TfR1/CD71), CD163, divalent metal transporter-1 (DMT-1), Lipocalin-2 (Lcn-2), Heme-oxygenase-1 (HO-1), Ferritin, Natural resistance-associated macrophage protein (NRAMP-1) and Ferroportin (Fpn-1) was evaluated by droplet digital PCR. Circulating monocytes demonstrated elevated levels of CD71, CD163 and soluble CD163, which corroborated with an enhanced lesional mRNA expression of TfR, CD163, DMT1 and Lcn-2. Additionally, the LIP was raised along with an elevated mRNA expression of ferritin and HO-1, as also iron exporters NRAMP-1 and Fpn-1. CONCLUSIONS/SIGNIFICANCE:In monocytes/macrophages of PKDL cases, enhancement of the iron influx gateways (TfR, CD163, DMT-1 and Lcn-2) possibly accounted for the enhanced LIP. However, enhancement of the iron exporters (NRAMP-1 and Fpn-1) defied the classical Ferritinlow/Ferroportinhigh phenotype of alternatively activated macrophages. The creation of such a pro-parasitic environment suggests incorporation of chemotherapeutic strategies wherein the availability of iron to the parasite can be restricted.

SUBMITTER: Dighal A

PROVIDER: S-EPMC7001907 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Iron trafficking in patients with Indian Post kala-azar dermal leishmaniasis.

Dighal Aishwarya A Mukhopadhyay Debanjan D Sengupta Ritika R Moulik Srija S Mukherjee Shibabrata S Roy Susmita S Chaudhuri Surya Jyati SJ Das Nilay K NK Chatterjee Mitali M

PLoS neglected tropical diseases 20200205 2

<h4>Background</h4>During infections involving intracellular pathogens, iron performs a double-edged function by providing the pathogen with nutrients, but also boosts the host's antimicrobial arsenal. Although the role of iron has been described in visceral leishmaniasis, information regarding its status in the dermal sequel, Post Kala-azar Dermal Leishmaniasis (PKDL) remains limited. Accordingly, this study aimed to establish the status of iron within monocytes/macrophages of PKDL cases.<h4>Me ...[more]

PMID: 32023254

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Project description:Background: Post Kala Azar Dermal Leishmaniasis (PKDL) is a non-fatal dermal sequel of Visceral Leishmaniasis (VL), affecting individuals worldwide. Available diagnostic tools lack sensitivity and specificity toward identifying macular (MAC) PKDL patients, due to low parasite load in patients' sample. Confirmatory test like punch biopsy are invasive and painful. Considering the rural nature of this disease and the prevailing situation of diagnostic scenario, PKDL patients mostly remains unattended from receiving proper medical care. They in turn act as "mobile parasite reservoir," responsible for VL transmission among healthy individuals (HI). This study aims to identify PKDL disease specific glycated protein biomarkers, utilizing the powerful LC-MS/MS technology, which is the tool of choice to efficiently identify and quantify disease specific protein biomarkers. These identified PKDL disease specific novel glycoproteins could be developed in future as immunochromatographic based assay for efficient case detection. Methodology: Previously our lab had identified importance of glycated (Circulating Immune Complexes) CICs, among PKDL patients. This study aims to further characterize disease specific glycated protein biomarkers, among MAC PKDL patients for both diagnostic and prognostic evaluation of the disease. LC-MS/MS based comparative spectral count analysis of MAC PKDL to polymorphic (POLY) PKDL, HI, and Cured (CR) individuals were performed. Proteins level alterations among all study groups were confirmed by Western blot and enzyme-linked immunosorbant Assay (ELISA). Results: Among MAC PKDL patients 43, 60, 90 proteins were altered compared to POLY PKDL, HI, and CR groups, respectively. Filtering for the most significant proteins, Plasminogen (PLG) and Vitronectin (VTN) were identified which promisingly identified MAC PKDL cases. Active surveillance results from endemic districts of West Bengal revealed drastic rise of MAC PKDL cases, alarming the urgency for field adaptive efficient biomarker. Conclusion: This current study aims to establish PLG and VTN as novel diagnostic and prognostic protein biomarker for MAC and POLY PKDL cases management.

Project description:The South-East Asia Region Kala-azar Elimination Programme (KAEP) is expected to enter the consolidation phase in 2017, which focuses on case detection, vector control, and identifying potential sources of infection. Post-kala-azar dermal leishmaniasis (PKDL) is thought to play a role in the recurrence of visceral leishmaniasis (VL)/kala-azar outbreaks, and control of PKDL is among the priorities of the KAEP.We reviewed the literature with regard to PKDL in Asia and interpreted the findings in relation to current intervention methods in the KAEP in order to make recommendations. There is a considerable knowledge gap regarding the pathophysiology of VL and PKDL, especially the underlying immune responses. Risk factors (of which previous VL treatments may be most important) are poorly understood and need to be better defined. The role of PKDL patients in transmission is largely unknown, and there is insufficient information about the importance of duration, distribution and severity of the rash, time of onset, and self-healing. Current intervention methods focus on active case detection and treatment of all PKDL cases with miltefosine while there is increasing drug resistance. The prevention of PKDL by improved VL treatment currently receives insufficient attention.PKDL is a heterogeneous and dynamic condition, and patients differ with regard to time of onset after VL, chronicity, and distribution and appearance of the rash, as well as immune responses (including tendency to self-heal), all of which may vary over time. It is essential to fully describe the pathophysiology in order to make informed decisions on the most cost-effective approach. Emphasis should be on early detection of those who contribute to transmission and those who are in need of treatment, for whom short-course, effective, and safe drug regimens should be available. The prevention of PKDL should be emphasised by innovative and improved treatment for VL, which may include immunomodulation.

Project description:Little is known about the parasite/host factors that lead to Post Kala-azar Dermal Leishmaniasis (PKDL) in some visceral leishmaniasis (VL) patients after drug-cure. Studies in Sudan provide evidence for association between polymorphisms in the gene (IFNGR1) encoding the alpha chain of interferon-? receptor type I and risk of PKDL. This study aimed to identify putative functional polymorphisms in the IFNGR1 gene, and to determine whether differences in expression of interferon-? (IFNG) and IFNGR1 at the RNA level are associated with pathogenesis of VL and/or PKDL in Sudan.Sanger sequencing was used to re-sequence 841 bp of upstream, exon1 and intron1 of the IFNGR1 gene in DNA from 30 PKDL patients. LAGAN and SYNPLOT bioinformatics tools were used to compare human, chimpanzee and dog sequences to identify conserved noncoding sequences carrying putative regulatory elements. The relative expression of IFNG and IFNGR1 in paired pre- and post-treatment RNA samples from the lymph nodes of 24 VL patients, and in RNA samples from skin biopsies of 19 PKDL patients, was measured using real time PCR. Pre- versus post-treatment expression was evaluated statistically using the nonparametric Wilcoxon matched pairs signed-rank test.Ten variants were identified in the 841 bp of sequence, four of which are novel polymorphisms at -77A/G, +10 C/T, +18C/T and +91G/T relative to the IFNGR1 initiation site. A cluster of conserved non-coding sequences with putative regulatory variants was identified in the distal promoter of IFNGR1. Variable expression of IFNG was detected in lymph node aspirates of VL patients before treatment, with a marked reduction (P?=?0.006) in expression following treatment. IFNGR1 expression was also variable in lymph node aspirates from VL patients, with no significant reduction in expression with treatment. IFNG expression was undetectable in the skin biopsies of PKDL cases, while IFNGR1 expression was also uniformly low.Uniformly low expression of IFN and IFNGR1 in PKDL skin biopsies could explain parasite persistence and is consistent with prior demonstration of genetic association with IFNGR1 polymorphisms. Identification of novel potentially functional rare variants at IFNGR1 makes an important general contribution to knowledge of rare variants of potential relevance in this Sudanese population.

Project description:Post Kala Azar Dermal Leishmaniasis (PKDL) is a non-fatal dermal sequel of Visceral Leishmaniasis (VL), caused by protozoan parasite Leishmania donovani. On the global scenario, PKDL in mainly restricted to distinct zones of South Asia (India, Nepal and Bangladesh) and East Africa, mainly Sudan. In India, the most prominent fatal form of leishmaniasis present is VL, affecting entirely the eastern region of the country. The clinical presentation of VL and PKDL differ substantially; where VL patients suffer from sustained fever, hepatospleenomegaly, weight loss and anemia, PKDL patients manifest dermal lesions in the form of macular, nodular and polymorphic. Although, compared to VL, the mortality rate of PKDL is significantly lower, yet it is observed as a stigmatizing disease that brings a substantial socioeconomic burden, further intensified by a hesitancy of patients, to obtain treatment, or due to noncompliance. Lesions, especially the polymorphic forms, are parasite-rich, concluding that PKDL plays a crucial role in the anthroponotic transmission of VL. PKDL patients with Macular lesions, having comparatively lower parasitic load, and thus lacks detection sensitivity with standard techniques like rK39 (73% sensitivity), Leishmanin skin test (54% sensitivity) and Histopathological studies with patients’ skin biopsy sample (7-33% sensitivity) and is often misdiagnosed as Vitiligo cases. In order to completely eliminate Kala-azar in Southeast Asia, proper identification of various routes of the disease is essential, which could efficiently distinguish between cured PKDL and active PKDL as well as active PKDL from other cross disease like Leprosy and Vitiligo. Till now very less work has been done towards biomarker identification for PKDL from patients’ plasma. Most of the methods for disease identification are based on highly invasive tissue biopsy followed by PCR/qPCR. Recently investigations from our group have demonstrated the presence of novel glycoproteins in the circulating immune complexes (CICs) from serum, as biomarkers for early identification of PKDL patients. An Immune complex (IC), sometimes called an antigen-antibody complex, is a molecule formed from the integral binding of an antibody to a soluble antigen. After an antigen-antibody reaction, the immune complexes can be subject to any number of responses, including complement deposition, opsonisation, phagocytosis, or processing by proteases. Accumulation of ICs leads to a broad spectrum of pro-inflammatory effects, including activation of the complement cascade and induction of cytokine secretion. These complexes may also be deposited in tissues and vessel walls, leading to inflammation, tissue damage and, ultimately, disease manifestations. Immune complexes also affect disease progression and outcome in various disorders through the induction of pro-inflammatory or anti-inflammatory cytokines. In the present study we hypothesize that the CICs’ proteome is altered among PKDL patients with different dermal manifestations (Macular and Polymorphic) as compared to Cured individuals (CR) and Healthy controls (HI). The aim of this current study is to identify differentially expressed CIC proteomic profile among different forms PKDL patients as compared to HI. The differential protein expression of specific unique peptide fragments, representing specific proteins, could be used as diagnostic biomarkers in early detection of both Macular and Polymorphic PKDL cases. In this prospective study, we included PKDL patients with Macular and/or Polymorphic lesion, Cured individuals and HI. Among the enrolled patients, blood samples were collected from 20 primarily confirmed PKDL patients with Macular lesions, 20 primarily confirmed PKDL patients with Polymorphic lesions, 12 Cured individuals previously suffering from PKDL and 12 Healthy individuals; collected during the period of 2015-2016, stored at -80°C. Next the CICs were purified from PKDL patients’ plasma and LC MS/MS analysis was performed using Q-ExactivePlusOrbitrap mass spectrometer. This work for the first time revealed the differential CICs proteome profile among different forms of PKDL patients as compared to their Cured and Healthy counterparts.

Dataset Information

Iron trafficking in patients with Indian Post kala-azar dermal leishmaniasis.

Publications

Iron trafficking in patients with Indian Post kala-azar dermal leishmaniasis.

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