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Paracoccidioides species present distinct fungal adherence to epithelial lung cells and promote different IL-8 secretion levels

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Abstract

Fungi that belong to the genus Paracoccidioides are the etiologic agents of paracoccidioidomycosis, a human systemic mycosis, which occurs in Latin America. Epithelial cell is one of the first cells that interact with these fungi and responds by secreting inflammatory mediators such as cytokines. In the present study, we demonstrate that yeasts of different isolates of Paracoccidioides brasiliensis (Pb18 and Pb03) and Paracoccidioides lutzii (Pb01) distinctly promoted interleukin (IL)-8 secretion by the lung epithelial cell line A549. Depending on the isolate, this cytokine release may rely on the epithelial cell interaction with fungal secreted components or direct contact with the pathogen. In addition, adhesion of yeasts to the pulmonary epithelial cells was also different among Paracoccidioides isolates, and the highest percentage of A549 cells with adhered fungi was observed with P. lutzii. All Paracoccidioides isolates induced an expression increase of α3 and α5 integrins in A549 cells and, using small interfering RNA, we observed that the integrin silencing promoted a reduction of P. lutzii adhesion, which suggests the involvement of integrins in this event. Together, these results indicate that host epithelial cell response may depend on the isolate of Paracoccidioides.

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Acknowledgements

This work was supported by São Paulo Research Foundation (FAPESP Grants 2015/25652-6 and 2016/06285-5), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq Grants 130309/2017-6, 164126/2014-7, and 306163/2015-2), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). This study was approved by the Research Ethics Committee of Universidade Federal de São Paulo (3210090817).

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Authors and Affiliations

  1. Department of Microbiology, Immunology, and Parasitology, Escola Paulista de Medicina, Universidade Federal de São Paulo, Rua Botucatu, 862-Ed. Antônio C. M. Paiva-6 andar, São Paulo, SP, 04023-062, Brazil

    Bruna Rocha Almeida, Bianca Carla Silva Campitelli Barros, Ana Clara Liguori Araújo, Cristiane Alcantara & Erika Suzuki

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  1. Bruna Rocha Almeida
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  2. Bianca Carla Silva Campitelli Barros
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Correspondence to Erika Suzuki.

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Almeida, B.R., Barros, B.C.S.C., Araújo, A.C.L. et al. Paracoccidioides species present distinct fungal adherence to epithelial lung cells and promote different IL-8 secretion levels. Med Microbiol Immunol 209, 59–67 (2020). https://doi.org/10.1007/s00430-019-00639-0

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