scholarly journals Toward a Novel Experimental Model of Infection To Study American Cutaneous Leishmaniasis Caused by Leishmania braziliensis

2005 ◽  
Vol 73 (9) ◽  
pp. 5827-5834 ◽  
Author(s):  
Tatiana R. de Moura ◽  
Fernanda O. Novais ◽  
Fabiano Oliveira ◽  
Jorge Clarêncio ◽  
Almério Noronha ◽  
...  
Keyword(s):  
Lymph Node ◽  
Cutaneous Leishmaniasis ◽  
Experimental Model ◽  
Leishmania Braziliensis ◽  
Polymorphonuclear Cells ◽  
Mucocutaneous Leishmaniasis ◽  
American Cutaneous Leishmaniasis ◽  
Lymph Node Cells ◽  
Draining Lymph Node ◽  
Ifn Γ

ABSTRACT Leishmania spp. cause a broad spectrum of diseases collectively known as leishmaniasis. Leishmania braziliensis is the main etiological agent of American cutaneous leishmaniasis (ACL) and mucocutaneous leishmaniasis. In the present study, we have developed an experimental model of infection that closely resembles ACL caused by L. braziliensis. In order to do so, BALB/c mice were infected in the ear dermis with 105 parasites and distinct aspects of the infection were evaluated. Following inoculation, parasite expansion in the ear dermis was accompanied by the development of an ulcerated dermal lesion which healed spontaneously, as seen by the presence of a scar. Histological analysis of infected ears showed the presence of a mixed inflammatory infiltrate consisting of both mononuclear and polymorphonuclear cells. In draining lymph nodes, parasite replication was detected throughout the infection. In vitro restimulation of draining lymph node cells followed by intracellular staining showed an up-regulation in the production of gamma interferon (IFN-γ) and in the frequency of IFN-γ-secreting CD4+ and CD8+ T cells. Reverse transcription-PCR of ears and draining lymph node cells showed the expression of CC chemokines. The dermal model of infection with L. braziliensis herein is able to reproduce aspects of the natural infection, such as the presence of an ulcerated lesion, parasite dissemination to lymphoid areas, and the development of a Th1-type immune response. These results indicate that this model shall be useful to address questions related to the concomitant immunity to reinfection and parasite persistence leading to mucocutaneous leishmaniasis.

Case Report: Miltefosine Failure and Spontaneous Resolution of Cutaneous Leishmaniasis braziliensis

2021 ◽  
Author(s):  
Sheridan Joseph ◽  
Timothy J. Whitman ◽  
Frederick S. Buckner ◽  
Anna L. Cogen
Keyword(s):  
Case Report ◽  
South America ◽  
Treatment Failure ◽  
Cutaneous Leishmaniasis ◽  
Young Woman ◽  
Spontaneous Resolution ◽  
Clinical Monitoring ◽  
Leishmania Braziliensis ◽  
Oral Medications ◽  
Mucocutaneous Leishmaniasis

Cutaneous leishmaniasis (CL) is often caused by Leishmania braziliensis (L. braziliensis) in South America. Because of the risk for mucocutaneous leishmaniasis, L. braziliensis is frequently treated with parenteral or oral medications. Here, we present a case of a young woman with L. braziliensis (CL) that did not respond to miltefosine but eventually experienced spontaneous resolution. This case highlights the potential for treatment failure and the importance of clinical monitoring in the setting of cutaneous leishmaniasis caused by L. braziliensis.

Effect of Interleukin-l?? on the In Vitro Activation of Tumor-Draining Lymph Node Cells for Adoptive Immunotherapy

1994 ◽  
Vol 16 (1) ◽  
pp. 1-12
Author(s):  
James M. Hammel ◽  
Melissa K. Tuck ◽  
Jon M. Hain ◽  
Alfred E. Chang ◽  
Vernon K. Sondak
Keyword(s):  
Lymph Node ◽  
Adoptive Immunotherapy ◽  
In Vitro Activation ◽  
Lymph Node Cells ◽  
Draining Lymph Node ◽  
Tumor Draining Lymph Node

Activation by anti-CD3 of tumor-draining lymph node cells for specific adoptive immunotherapy

1991 ◽  
Vol 134 (2) ◽  
pp. 473-479 ◽  
Author(s):  
Hirohisa Yoshizawa ◽  
Keisuke Sakai ◽  
Alfred E. Chang ◽  
Suyu Shu
Keyword(s):  
Lymph Node ◽  
Adoptive Immunotherapy ◽  
Lymph Node Cells ◽  
Draining Lymph Node ◽  
Tumor Draining Lymph Node

Combined Treatment with Short Synthetic Anti-Lymphoma Peptide and CpG ODN; A Therapeutic Vaccine Which cures the A20 Lymphoma in Balb/C Mice.

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 1586-1586
Author(s):  
Arne Kolstad ◽  
Roch Houot ◽  
Gerd Berge ◽  
Øystein Rekdal ◽  
Debra Czerwinski ◽  
...  
Keyword(s):  
T Cells ◽  
Lymph Node ◽  
T Cell ◽  
Combined Treatment ◽  
Therapeutic Vaccine ◽  
Immunological Memory ◽  
Separate Experiment ◽  
Lymphoma Cells ◽  
Draining Lymph Node ◽  
Ifn Γ

Abstract Background. The short synthetic peptide 302 has been shown to induce rapid membrane disruption of lymphoma cells in vitro and necrosis of local tumors in the A20 lymphoma model in Balb/c mice. In order to stimulate the immune system to generate an anti-tumor response we designed a model where intra-tumor injections of peptide 302 was combined with sc injections of the Toll-like receptor 9 binding synthetic oligonucleotide CpG 1826. Methods. Balb/c mice were inoculated with A20 lymphoma cells sub-cutaneously (s.c.) on the abdomen. When the tumors reached a size of 5–7 mm, 302 peptide was administered directly into the tumors on days 1 and 6. CpG 1826 was injected s.c. on days 1–4 and 6–8. Tumor growth was measured repeatedly during follow-up. A20-specific T-cell responses were detected by culturing peripheral blood lymphocytes from treated animals for 24 hours with A20 lymphoma cells and analyzing for intracellular IFN-γ production by flow cytometry. To dissect the role of T-cell subtypes, the treatment was performed in animals depleted for CD4 or CD8 positive T-cells. In order to show A20 specific immunological memory, cured animals were re-challenged with the A20 lymphoma or the carcinoma cell line CT26. Results. Combined treatment with peptide 302 and CpG 1826 cured 8 out of 10 mice, compared to only 2 out of 10 mice who received peptide 302 alone or CpG 1826 alone. Cured mice were followed for 9 weeks without relapsing. Similar results with the combination of peptide 302 and CpG were observed in a separate experiment. The highest cure rate was achieved when injecting CpG 1826 s.c. in the tumors draining lymph node area as compared to administration of CPG 1826 in a non-draining lymph node region or intra-peritoneal. Animals treated with peptide 302 + CpG 1826 or CpG 1826 alone developed CD8-specific IFN-γ responses against A20 cells. In one separate experiment CD8 knock-out mice did not respond to the treatment, unlike animals depleted for CD4+ cells and normal mice. Only 1 out of 10 cured animals re-challenged with the A20 lymphoma developed a new tumor, a result that was reproduced in a second experiment. Conclusion: Treatment with intra-tumor injections of the anti-lymphoma peptide 302 in combination with CpG 1826 s.c. in the draining lymph node region cured established A20 tumors, induced tumor-specific CD8 positive tumor-reactive T-cells, and induced specific immunological memory. This principle represents a novel therapeutic vaccine approach.

Modulation of intracellular cytokines in draining lymph node cells following allergen and irritant

2005 ◽  
Vol 20 (1) ◽  
pp. 225-232
Author(s):  
Jong Kwon Lee ◽  
Jae Hyun Park ◽  
Juno H. Eom ◽  
Hyung Soo Kim ◽  
Hye Young Oh
Keyword(s):  
Lymph Node ◽  
Intracellular Cytokines ◽  
Lymph Node Cells ◽  
Draining Lymph Node

scholarly journals Differential Expression of Gamma Interferon mRNA Induced by Attenuated and Virulent Mycobacterium tuberculosis in Guinea Pig Cells after Mycobacterium bovis BCG Vaccination

2003 ◽  
Vol 71 (1) ◽  
pp. 354-364 ◽  
Author(s):  
Amminikutty Jeevan ◽  
Teizo Yoshimura ◽  
Kyeong Eun Lee ◽  
David N. McMurray
Keyword(s):  
T Cells ◽  
Mycobacterium Tuberculosis ◽  
Lymph Node ◽  
Amino Acid ◽  
Guinea Pig ◽  
Mrna Expression ◽  
Mycobacterium Bovis ◽  
Bcg Vaccination ◽  
Lymph Node Cells ◽  
Ifn Γ

ABSTRACT To determine whether Mycobacterium bovis BCG vaccination would alter gamma interferon (IFN-γ) mRNA expression in guinea pig cells exposed to Mycobacterium tuberculosis, we cloned a cDNA encoding guinea pig IFN-γ from a spleen cell cDNA library. The cDNA is composed of 1,110 bp, with an open reading frame encoding a 166-amino-acid protein which shows 56 and 41% amino acid sequence homology to human and mouse IFN-γ, respectively. Spleen or lymph node cells from naïve and BCG-vaccinated guinea pigs were stimulated with purified protein derivative (PPD) or M. tuberculosis H37Ra or H37Rv, and the total RNA was subjected to Northern blot analysis with a 32P-labeled probe derived from the cDNA clone. Compared to the IFN-γ mRNA expression in cells of naïve animals, that in spleen and lymph node cells exposed to various stimuli was enhanced after BCG vaccination. However, there was a significant reduction in IFN-γ mRNA levels when cells were stimulated with a multiplicity of infection of greater than 1 virulent M. tuberculosis bacterium per 10 cells. The enhanced IFN-γ mRNA response in BCG-vaccinated animals was associated with an increase in the proportions of CD4+ T cells in the spleens, as determined by fluorescence-activated cell sorter analysis. Furthermore, the nonadherent population in the spleens enriched either by panning with anti-guinea pig immunoglobulin G-coated plates or by purification on nylon wool columns produced more IFN-γ mRNA than whole spleen cells following stimulation with concanavalin A or PPD. This indicates that T cells are principally responsible for the upregulation of IFN-γ mRNA expression following BCG vaccination. The mechanism by which virulent mycobacteria suppress IFN-γ mRNA accumulation is currently under investigation.

Sign in / Sign up

Export Citation Format

Share Document