Cleare Levi G, Zamith Daniel, Heyman Heino M, Couvillion Sneha P, Nimrichter Leonardo, Rodrigues Marcio L, Nakayasu Ernesto S, Nosanchuk Joshua D
Department of Medicine (Division of Infectious Diseases) and Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, USA.
Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, USA.
Cell Microbiol. 2020 Sep;22(9):e13217. doi: 10.1111/cmi.13217. Epub 2020 Jun 22.
Histoplasma capsulatum is a dimorphic fungus that most frequently causes pneumonia, but can also disseminate and proliferate in diverse tissues. Histoplasma capsulatum has a complex secretion system that mediates the release of macromolecule-degrading enzymes and virulence factors. The formation and release of extracellular vesicles (EVs) are an important mechanism for non-conventional secretion in both ascomycetes and basidiomycetes. Histoplasma capsulatum EVs contain diverse proteins associated with virulence and are immunologically active. Despite the growing knowledge of EVs from H. capsulatum and other pathogenic fungi, the extent that changes in the environment impact the sorting of organic molecules in EVs has not been investigated. In this study, we cultivated H. capsulatum with distinct culture media to investigate the potential plasticity in EV loading in response to differences in nutrition. Our findings reveal that nutrition plays an important role in EV loading and formation, which may translate into differences in biological activities of these fungi in various fluids and tissues.
荚膜组织胞浆菌是一种双相真菌,最常引起肺炎,但也可在多种组织中播散和增殖。荚膜组织胞浆菌具有复杂的分泌系统,可介导大分子降解酶和毒力因子的释放。细胞外囊泡(EVs)的形成和释放是子囊菌和担子菌中非传统分泌的重要机制。荚膜组织胞浆菌EVs含有多种与毒力相关的蛋白质,且具有免疫活性。尽管对来自荚膜组织胞浆菌和其他致病真菌的EVs的了解越来越多,但环境变化对EVs中有机分子分选的影响程度尚未得到研究。在本研究中,我们用不同的培养基培养荚膜组织胞浆菌,以研究其对营养差异的反应中EVs装载的潜在可塑性。我们的研究结果表明,营养在EVs装载和形成中起重要作用,这可能转化为这些真菌在各种体液和组织中的生物活性差异。