Integrative Model of Oxidative Stress Adaptation in the Fungal Pathogen Candida albicans.

Autor: Komalapriya C; Institute of Complex Systems and Mathematical Biology, University of Aberdeen, Aberdeen, United Kingdom; School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, United Kingdom., Kaloriti D; School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, United Kingdom., Tillmann AT; School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, United Kingdom., Yin Z; School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, United Kingdom., Herrero-de-Dios C; School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, United Kingdom., Jacobsen MD; School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, United Kingdom., Belmonte RC; School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, United Kingdom., Cameron G; School of Medicine and Dentistry, University of Aberdeen, Foresterhill, Aberdeen, United Kingdom., Haynes K; College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom., Grebogi C; Institute of Complex Systems and Mathematical Biology, University of Aberdeen, Aberdeen, United Kingdom., de Moura AP; Institute of Complex Systems and Mathematical Biology, University of Aberdeen, Aberdeen, United Kingdom., Gow NA; School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, United Kingdom., Thiel M; Institute of Complex Systems and Mathematical Biology, University of Aberdeen, Aberdeen, United Kingdom., Quinn J; Institute for Cell and Molecular Biosciences, University of Newcastle, Newcastle upon Tyne, United Kingdom., Brown AJ; School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, United Kingdom., Romano MC; Institute of Complex Systems and Mathematical Biology, University of Aberdeen, Aberdeen, United Kingdom; School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, United Kingdom.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2015 Sep 14; Vol. 10 (9), pp. e0137750. Date of Electronic Publication: 2015 Sep 14 (Print Publication: 2015).
DOI: 10.1371/journal.pone.0137750
Abstrakt: The major fungal pathogen of humans, Candida albicans, mounts robust responses to oxidative stress that are critical for its virulence. These responses counteract the reactive oxygen species (ROS) that are generated by host immune cells in an attempt to kill the invading fungus. Knowledge of the dynamical processes that instigate C. albicans oxidative stress responses is required for a proper understanding of fungus-host interactions. Therefore, we have adopted an interdisciplinary approach to explore the dynamical responses of C. albicans to hydrogen peroxide (H2O2). Our deterministic mathematical model integrates two major oxidative stress signalling pathways (Cap1 and Hog1 pathways) with the three major antioxidant systems (catalase, glutathione and thioredoxin systems) and the pentose phosphate pathway, which provides reducing equivalents required for oxidative stress adaptation. The model encapsulates existing knowledge of these systems with new genomic, proteomic, transcriptomic, molecular and cellular datasets. Our integrative approach predicts the existence of alternative states for the key regulators Cap1 and Hog1, thereby suggesting novel regulatory behaviours during oxidative stress. The model reproduces both existing and new experimental observations under a variety of scenarios. Time- and dose-dependent predictions of the oxidative stress responses for both wild type and mutant cells have highlighted the different temporal contributions of the various antioxidant systems during oxidative stress adaptation, indicating that catalase plays a critical role immediately following stress imposition. This is the first model to encapsulate the dynamics of the transcriptional response alongside the redox kinetics of the major antioxidant systems during H2O2 stress in C. albicans.
Databáze: MEDLINE
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