Peptidorhamnomannan from Lomentospora prolificans modulates the inflammatory response in macrophages infected with Candida albicans

BMC Microbiology

article

Xisto, Mariana Ingrid Dutra da Silva¹  Santos, Suelen S.²  Rossato, Luana²  Yoshikawa, Fábio Seiti Yamada²  Haido, Rosa Maria Tavares³  de Almeida, Sandro Rogério²  Barreto-Bergter, Eliana¹ 

[1] Departamento de Microbiologia Geral, Laboratório de Química Biológica de Microrganismos, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro (UFRJ);Departamento de Análises Clinicas e Toxicológicas, Faculdade de Ciências Farmacêuticas –USP;Departamento de Microbiologia e Parasitologia, Instituto Biomédico

关键词: Peptidorhamnomannan;    Lomentospora prolificans;    Candida albicans;    Inflammatory response;   

DOI  :  10.1186/s12866-020-01931-3

学科分类：放射科、核医学、医学影像

来源: BioMed Central

【 摘 要 】

Peptidorhamnomannan is a glycoconjugate that consists of a peptide chain substituted by O- and N-linked glycans, present on the cell surface of Lomentospora prolificans, a saprophytic fungus which is widely distributed in regions with temperate climates. O-linked oligosaccharides from peptidorhamnomannan isolated from Lomentospora prolificans conidia are recognized by macrophages mediating macrophage - conidia interaction. In this work, peptidorhamnomannan was isolated from L. prolificans mycelium cell wall and its role in macrophage - Candida albicans interaction was evaluated. Purified peptidorhamnomannan inhibits the reactivity of rabbit immune sera to mycelial and conidia forms of L. prolificans, indicating that this glycoconjugate is exposed on the fungal surface and can mediate interaction with host immune cells. We demonstrated that peptidorhamnomannan leads to TNF-α production in J774 macrophages for 1, 2 and 3 h of incubation, suggesting that this glycoconjugate may have a beneficial role in the response to fungal infections. In order to confirm this possibility, the effect of peptidorhamnomannan on the macrophage - C. albicans interaction was evaluated. Macrophages treated with peptidorhamnomannan led to a lower fungal survival, suggesting that peptidorhamnomannan induces an increased fungicidal activity in macrophages. Furthermore, TNF-α levels were measured in supernatants after macrophage - C. albicans interaction for 1, 2 and 3 h. Peptidorhamnomannan treatment led to a higher TNF-α production at the beginning of the interaction. However, the release of TNF-α was not maintained after 1 h of incubation. Besides, peptidorhamnomannan did not show any inhibitory or fungicidal effect in C. albicans when used at 100 μg/ml but it was able to kill C. albicans at a concentration of 400 μg/ml. We suggest that peptidorhamnomannan acts as a molecular pattern on the invading pathogen, promotes TNF-α production and, thus, increases macrophage fungicidal activity against Candida albicans.

【 授权许可】

CC BY|CC0