Gustavo Goldman – Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo
Systemic Aspergillus fumigatus infections are often accompanied by high mortality rates. The fungal cell wall is important for infection as it has immunomodulatory and immunoevasive properties. Paradoxical growth of A. fumigatus in the presence of high concentrations of the cell wall-disturbing agent caspofungin has been observed for more than a decade, although the mechanistic nature of this phenomenon remains largely uncharacterized. Here, we show that the CWI pathway components MpkA and RlmA as well as the calcium/calcineurin-responsive transcription factor CrzA regulate the expression of cell wall biosynthetic genes during the caspofungin paradoxical effect (CPE). Furthermore, an additional, novel calcium/calcineurin-responsive transcription factor was identified to play a role in cell wall biosynthesis gene expression during the CPE. This work paints a crucial role for calcium metabolism in the CPE and provides further insight into the complex regulation of cell wall biosynthesis, which could ultimately lead to the development of more efficient antifungal therapies.
Contact : Guilhem Janbon (firstname.lastname@example.org)