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Neutrophil Extracellular Traps Identification in Tegumentary Lesions of Patients with Paracoccidioidomycosis and Different Patterns of NETs Generation In Vitro.

Della Coletta AM, Bachiega TF, de Quaglia e Silva JC, Soares ÂM, De Faveri J, Marques SA, Marques ME, Ximenes VF, Dias-Melicio LA - PLoS Negl Trop Dis (2015)

Bottom Line: The quantification of extracellular DNA corroborates the idea of the ability of P. brasiliensis in inducing NETs release.In conclusion, our data show for the first time the identification of NETs in lesions of patients with PCM and demonstrate distinct patterns of NETs in cultures challenged with fungi in vitro.The presence of NETs components both in vivo and in vitro open new possibilities for the detailed investigation of immunity in PCM.

View Article: PubMed Central - PubMed

Affiliation: Department of Pathology, UNESP - São Paulo State University, Botucatu Medical School, Botucatu, São Paulo, Brazil.

ABSTRACT
Paracoccidioidomycosis (PCM) is a systemic mycosis, endemic in most Latin American countries, especially in Brazil. It is caused by the thermo-dimorphic fungus of the genus Paracoccidioides (Paracoccidioides brasiliensis and Paracoccidioides lutzii). Innate immune response plays a crucial role in host defense against fungal infections, and neutrophils (PMNs) are able to combat microorganisms with three different mechanisms: phagocytosis, secretion of granular proteins, which have antimicrobial properties, and the most recent described mechanism called NETosis. This new process is characterized by the release of net-like structures called Neutrophil Extracellular Traps (NETs), which is composed of nuclear (decondensed DNA and histones) and granular material such as elastase. Several microorganisms have the ability of inducing NETs formation, including gram-positive and gram-negative bacteria, viruses and some fungi. We proposed to identify NETs in tegumentary lesions of patients with PCM and to analyze the interaction between two strains of P. brasiliensis and human PMNs by NETs formation in vitro. In this context, the presence of NETs in vivo was evidenced in tegumentary lesions of patients with PCM by confocal spectrum analyzer. Furthermore, we showed that the high virulent P. brasiliensis strain 18 (Pb18) and the lower virulent strain Pb265 are able to induce different patterns of NETs formation in vitro. The quantification of extracellular DNA corroborates the idea of the ability of P. brasiliensis in inducing NETs release. In conclusion, our data show for the first time the identification of NETs in lesions of patients with PCM and demonstrate distinct patterns of NETs in cultures challenged with fungi in vitro. The presence of NETs components both in vivo and in vitro open new possibilities for the detailed investigation of immunity in PCM.

No MeSH data available.


Related in: MedlinePlus

Scanning electron microscopy from PMNs challenged with P. brasiliensis (50:1 ratio) in different periods of incubation showing NETs release.(A) PMNs activated with PMA (100ng/mL) for 30 minutes. (B) PMNs challenged with Pb18 for one hour. (C) PMNs challenged with Pb18 for two hours. (D) PMNs challenged with Pb18 and treated with DNAse (100U/mL) for 30 minutes. (PMN–neutrophil; Pb–P. brasiliensis; NETs–Neutrophil Extracellular Traps).
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pntd.0004037.g004: Scanning electron microscopy from PMNs challenged with P. brasiliensis (50:1 ratio) in different periods of incubation showing NETs release.(A) PMNs activated with PMA (100ng/mL) for 30 minutes. (B) PMNs challenged with Pb18 for one hour. (C) PMNs challenged with Pb18 for two hours. (D) PMNs challenged with Pb18 and treated with DNAse (100U/mL) for 30 minutes. (PMN–neutrophil; Pb–P. brasiliensis; NETs–Neutrophil Extracellular Traps).

Mentions: Non-treated PMNs from healthy donors were not able to release NETs, but in the presence of PMA, these structures were formed and visible after 45 minutes of incubation. PMA was able to induce an intense release of NETs that completely covered the observed area (Fig 4A).


Neutrophil Extracellular Traps Identification in Tegumentary Lesions of Patients with Paracoccidioidomycosis and Different Patterns of NETs Generation In Vitro.

Della Coletta AM, Bachiega TF, de Quaglia e Silva JC, Soares ÂM, De Faveri J, Marques SA, Marques ME, Ximenes VF, Dias-Melicio LA - PLoS Negl Trop Dis (2015)

Scanning electron microscopy from PMNs challenged with P. brasiliensis (50:1 ratio) in different periods of incubation showing NETs release.(A) PMNs activated with PMA (100ng/mL) for 30 minutes. (B) PMNs challenged with Pb18 for one hour. (C) PMNs challenged with Pb18 for two hours. (D) PMNs challenged with Pb18 and treated with DNAse (100U/mL) for 30 minutes. (PMN–neutrophil; Pb–P. brasiliensis; NETs–Neutrophil Extracellular Traps).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4556621&req=5

pntd.0004037.g004: Scanning electron microscopy from PMNs challenged with P. brasiliensis (50:1 ratio) in different periods of incubation showing NETs release.(A) PMNs activated with PMA (100ng/mL) for 30 minutes. (B) PMNs challenged with Pb18 for one hour. (C) PMNs challenged with Pb18 for two hours. (D) PMNs challenged with Pb18 and treated with DNAse (100U/mL) for 30 minutes. (PMN–neutrophil; Pb–P. brasiliensis; NETs–Neutrophil Extracellular Traps).
Mentions: Non-treated PMNs from healthy donors were not able to release NETs, but in the presence of PMA, these structures were formed and visible after 45 minutes of incubation. PMA was able to induce an intense release of NETs that completely covered the observed area (Fig 4A).

Bottom Line: The quantification of extracellular DNA corroborates the idea of the ability of P. brasiliensis in inducing NETs release.In conclusion, our data show for the first time the identification of NETs in lesions of patients with PCM and demonstrate distinct patterns of NETs in cultures challenged with fungi in vitro.The presence of NETs components both in vivo and in vitro open new possibilities for the detailed investigation of immunity in PCM.

View Article: PubMed Central - PubMed

Affiliation: Department of Pathology, UNESP - São Paulo State University, Botucatu Medical School, Botucatu, São Paulo, Brazil.

ABSTRACT
Paracoccidioidomycosis (PCM) is a systemic mycosis, endemic in most Latin American countries, especially in Brazil. It is caused by the thermo-dimorphic fungus of the genus Paracoccidioides (Paracoccidioides brasiliensis and Paracoccidioides lutzii). Innate immune response plays a crucial role in host defense against fungal infections, and neutrophils (PMNs) are able to combat microorganisms with three different mechanisms: phagocytosis, secretion of granular proteins, which have antimicrobial properties, and the most recent described mechanism called NETosis. This new process is characterized by the release of net-like structures called Neutrophil Extracellular Traps (NETs), which is composed of nuclear (decondensed DNA and histones) and granular material such as elastase. Several microorganisms have the ability of inducing NETs formation, including gram-positive and gram-negative bacteria, viruses and some fungi. We proposed to identify NETs in tegumentary lesions of patients with PCM and to analyze the interaction between two strains of P. brasiliensis and human PMNs by NETs formation in vitro. In this context, the presence of NETs in vivo was evidenced in tegumentary lesions of patients with PCM by confocal spectrum analyzer. Furthermore, we showed that the high virulent P. brasiliensis strain 18 (Pb18) and the lower virulent strain Pb265 are able to induce different patterns of NETs formation in vitro. The quantification of extracellular DNA corroborates the idea of the ability of P. brasiliensis in inducing NETs release. In conclusion, our data show for the first time the identification of NETs in lesions of patients with PCM and demonstrate distinct patterns of NETs in cultures challenged with fungi in vitro. The presence of NETs components both in vivo and in vitro open new possibilities for the detailed investigation of immunity in PCM.

No MeSH data available.


Related in: MedlinePlus