Dataset Information

The compositional landscape of minicircle sequences isolated from active lesions and scars of American cutaneous leishmaniasis.

ABSTRACT:

Background

American cutaneous leishmaniasis (ACL) is characterized by cutaneous lesions that heal spontaneously or after specific treatment. This paper reports on the analysis of kDNA minicircle sequences from clinical samples (typical lesions and scars) that were PCR-amplified with specific primers for Leishmania species of the subgenus Viannia.

Methods

From 56 clinical isolates we obtained a single amplified fragment (ca. 790 bp), which after cloning and sequencing resulted in 290 minicircle sequences from both active lesions and scars. We aimed to get a compositional profile of these sequences in clinical samples and evaluate the corresponding compositional changes. Sequences were analyzed with the compseq and wordcount (Emboss package) to get the composition of di-, tri-, tetra-, penta- and hexanucleotides. Additionally, we built a nucleotide dictionary with words of 7, 8, 9 and 10 nucleotides.

Results

This compositional analysis showed that minicircles amplified from active cutaneous lesions and scars have a distinct compositional profile as viewed by nucleotide composition of words up to 10mer. With regard to the most frequent nucleotide words above length 6, there is also a distinct pattern for 7, 8, 9 and 10mer.

Conclusion

These results indicate that minicircle sequences can be monitored upon direct exposure to a selection/stressing environment (e.g. chemical action) by evaluating their nucleotide compositional profile. It might be useful as a molecular tool in research concerning the evolution of infecting Leishmania in both vector and vertebrate hosts.

SUBMITTER: Rodrigues EH

PROVIDER: S-EPMC3750493 | biostudies-literature | 2013 Aug

REPOSITORIES: biostudies-literature

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Publications

The compositional landscape of minicircle sequences isolated from active lesions and scars of American cutaneous leishmaniasis.

Rodrigues Eduardo Henrique Gomes EH Soares Fábia Carla da Silva FC Werkhäuser Roberto Pereira RP de Brito Maria Edileuza F ME Fernandes Octavio O Abath Frederico G Coutinho FG Brandão Adeilton A

Parasites & vectors 20130807

<h4>Background</h4>American cutaneous leishmaniasis (ACL) is characterized by cutaneous lesions that heal spontaneously or after specific treatment. This paper reports on the analysis of kDNA minicircle sequences from clinical samples (typical lesions and scars) that were PCR-amplified with specific primers for Leishmania species of the subgenus Viannia.<h4>Methods</h4>From 56 clinical isolates we obtained a single amplified fragment (ca. 790 bp), which after cloning and sequencing resulted in 2 ...[more]

PMID: 23924509

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Project description:BackgroundCutaneous leishmaniasis (CL) poses a major public health concern in Ethiopia, with lesions and scars commonly affecting exposed body parts, resulting in physical, social, and psychological consequences. This study aims to assess the psychosocial impacts of CL, shedding light on the experiences and perceptions of affected individuals, thus contributing to the knowledge on Cutaneous leishmaniasis in Ethiopia and informing public health interventions to address its psychosocial effects.MethodsUsing a descriptive phenomenological design, the study explored the lived experiences of individuals with Cutaneous leishmaniasis lesions and scars. Participants were purposively selected, and data was collected through open-ended in-depth interviews. The analysis combined inductive and deductive approaches through an iterative process, developing a coding framework with seven themes (lesion & CL scar each) and subthemes, resulting in giving important insights in the psychosocial impacts of CL. NVivo 12v supported the analysis process.ResultThe study unveiled negative views and misconceptions surrounding CL and its impact. Application of traditional herbal medicine for CL lesions often leads to pus formation and a foul odour, triggering negative attitudes from others, resulting in embarrassment, pain, and anxiety, leading to discomfort and isolation. The negative psychosocial attitudes associated with CL scars deeply impacted affected individuals, influencing their behaviour. This included isolation and absenteeism from school. CL scars served as unique identifiers, shaping the affected individuals' identity and self-perception. The unreceptive environment affected the participant's self-esteem and coping mechanisms. The negative impact of CL scars extended to role performance, marriage prospects, and overall happiness, particularly for females facing additional societal pressure and stigma.ConclusionThe study highlights the need for improved education and awareness about CL to reduce misconceptions and negative attitudes towards affected individuals. Additionally, more effective treatment options and integrated preventive ways should be explored to minimize the physical and psychological impact of CL on affected individuals.

Project description:We evaluated the importance of neutrophils in the development of chronic lesions caused by L. Viannia spp. using the hamster as experimental model of American Cutaneous Leishmaniasis (ACL). Neutrophils infiltrated the lesion within the first six hours post-infection. Inhibition of this early infiltration using a polyclonal antibody or cyclophosphamide was associated with transient parasite control but the protective effect vanished when lesions became clinically apparent. At lesion onset (approximately 10 days p.i.), there was an increased proportion of both uninfected and infected macrophages, and subsequently a second wave of neutrophils infiltrated the lesion (after 19 days p.i.) This second neutrophil infiltration was associated with lesion necrosis and ulceration (R2 = 0.75) and maximum parasite burden. Intradermal delivery of N-formylmethionyl-leucyl-phenylalanine (fMLP), aimed to increase neutrophil infiltration, resulted in larger lesions with marked necrosis and higher parasite burden than in mock treated groups (p<0.001 each). In contrast, reduced neutrophil infiltration via cyclophosphamide-mediated depletion led to more benign lesions and lower parasite loads compared to controls (p<0.001 each). Neutrophils of the second wave expressed significantly lower GM-CSF, reactive oxygen species and nitric oxide than those of the first wave, suggesting that they had less efficient anti-leishmania activity. However, there was increased inflammatory cytokines and expression of neutrophil proteases (myeloperoxidase, cathepsin G and elastase) in lesions during the second wave of neutrophil infiltration compared with the levels reached during the first wave (6h p.i.). This suggests that augmented neutrophil proteases and inflammatory cytokines during the secondary wave of neutrophils could contribute to skin inflammation, ulceration and necrosis in ACL. The overall results indicate that neutrophils were unable to clear the infection in this model, and that the second wave of neutrophils played an important role in the severity of ACL.

Project description:BackgroundPentavalent antimonials (Sb5) and miltefosine are the first-line drugs for treating cutaneous leishmaniasis in Colombia; however, toxicity and treatment duration negatively impact compliance and cost, justifying an active search for better therapeutic options. We compared the efficacy and safety of thermotherapy and meglumine antimoniate for the treatment of cutaneous leishmaniasis in Colombia.MethodAn open randomized Phase III clinical trial was performed in five military health centres. located in northwestern, central and southern Colombia. Volunteers with parasitological positive diagnosis (Giemsa-stained smears) of cutaneous leishmaniasis were included. A single thermotherapy session involving the application of 50°C at the center and active edge of each lesion. Meglumine antimoniate was administered intramuscularly at a dose of 20 mg Sb5/kg weight/day for 20 days.ResultsBoth groups were comparable. The efficacy of thermotherapy was 64% (86/134 patients) by protocol and 58% (86/149) by intention-to-treat. For the meglumine antimoniate group, efficacy by protocol was 85% (103/121 patients) and 72% (103/143) by intention-to-treat, The efficacy between the treatments was statistically significant (p 0.01 and < 0.001) for analysis by intention to treat and by protocol, respectively. There was no difference between the therapeutic response with either treatment regardless of the Leishmania species responsible for infection. The side effects of meglumine antimoniate included myalgia, arthralgia, headache and fever. Regarding thermotherapy, the only side effect was pain at the lesion area four days after the initiation of treatment.ConclusionAlthough the efficacy rate of meglumine antimoniate was greater than that of thermotherapy for the treatment of cutaneous leishmaniasis, the side effects were also greater. Those factors, added to the increased costs, the treatment adherence problems and the progressive lack of therapeutic response, make us consider thermotherapy as a first line treatment for cutaneous leishmaniasis.

Dataset Information

The compositional landscape of minicircle sequences isolated from active lesions and scars of American cutaneous leishmaniasis.

Background

Methods

Results

Conclusion

Publications

The compositional landscape of minicircle sequences isolated from active lesions and scars of American cutaneous leishmaniasis.

Similar Datasets

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