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Sellam A, Tebbji F, Whiteway M, Nantel A. A novel role for the transcription factor Cwt1p as a negative regulator of nitrosative stress in Candida albicans. PLoS One 2012; 7:e43956. [PMID: 22952822 PMCID: PMC3430608 DOI: 10.1371/journal.pone.0043956] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Accepted: 07/27/2012] [Indexed: 11/21/2022] Open
Abstract
The ability of Candida albicans to survive in the presence of nitrosative stress during the initial contact with the host immune system is crucial for its ability to colonize mammalian hosts. Thus, this fungus must activate robust mechanisms to neutralize and repair nitrosative-induced damage. Until now, very little was known regarding the regulatory circuits associated with reactive nitrogen species detoxification in fungi. To gain insight into the transcriptional regulatory networks controlling nitrosative stress response (NRS) in C. albicans a compilation of transcriptional regulator-defective mutants were screened. This led to the identification of Cwt1p as a negative regulator of NSR. By combining genome-wide location and expression analyses, we have characterized the Cwt1p regulon and demonstrated that Cwt1p is directly required for proper repression of the flavohemoglobin Yhb1p, a key NO-detoxification enzyme. Furthermore, Cwt1p operates both by activating and repressing genes of specific functions solicited upon NSR. Additionally, we used Gene Set Enrichment Analysis to reinvestigate the C. albicans NSR-transcriptome and demonstrate a significant similarity with the transcriptional profiles of C. albicans interacting with phagocytic host-cells. In summary, we have characterized a novel negative regulator of NSR and bring new insights into the transcriptional regulatory network governing fungal NSR.
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Affiliation(s)
- Adnane Sellam
- Institute for Research in Immunology and Cancer (IRIC), University of Montreal, Montréal, QC, Canada
- * E-mail: (AS); (AN)
| | - Faiza Tebbji
- Biotechnology Research Institute, National Research Council of Canada, Montréal, QC, Canada
- Department of Biology, McGill University, Montréal, QC, Canada
| | - Malcolm Whiteway
- Biotechnology Research Institute, National Research Council of Canada, Montréal, QC, Canada
- Department of Biology, McGill University, Montréal, QC, Canada
| | - André Nantel
- Biotechnology Research Institute, National Research Council of Canada, Montréal, QC, Canada
- Department of Anatomy and Cell Biology, McGill University, Montréal, QC, Canada
- * E-mail: (AS); (AN)
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Ko SH, Nauta A, Morrison SD, Zhou H, Zimmermann A, Gurtner GC, Ding S, Longaker MT. Antimycotic ciclopirox olamine in the diabetic environment promotes angiogenesis and enhances wound healing. PLoS One 2011; 6:e27844. [PMID: 22125629 PMCID: PMC3220686 DOI: 10.1371/journal.pone.0027844] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Accepted: 10/26/2011] [Indexed: 12/01/2022] Open
Abstract
Diabetic wounds remain a major medical challenge with often disappointing outcomes despite the best available care. An impaired response to tissue hypoxia and insufficient angiogenesis are major factors responsible for poor healing in diabetic wounds. Here we show that the antimycotic drug ciclopirox olamine (CPX) can induce therapeutic angiogenesis in diabetic wounds. Treatment with CPX in vitro led to upregulation of multiple angiogenic genes and increased availability of HIF-1α. Using an excisional wound splinting model in diabetic mice, we showed that serial topical treatment with CPX enhanced wound healing compared to vehicle control treatment, with significantly accelerated wound closure, increased angiogenesis, and increased dermal cellularity. These findings offer a promising new topical pharmacologic therapy for the treatment of diabetic wounds.
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Affiliation(s)
- Sae Hee Ko
- Hagey Laboratory for Regenerative Medicine, Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, California, United States of America
- Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States of America
| | - Allison Nauta
- Hagey Laboratory for Regenerative Medicine, Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, California, United States of America
- Department of Surgery, Georgetown University School of Medicine, Washington, D.C., United States of America
| | - Shane D. Morrison
- Hagey Laboratory for Regenerative Medicine, Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, California, United States of America
- Stanford University School of Medicine, Stanford, California, United States of America
| | - Hongyan Zhou
- Gladstone Institute of Cardiovascular Disease, University of California San Francisco Mission Bay Campus, San Francisco, California, United States of America
| | - Andrew Zimmermann
- Hagey Laboratory for Regenerative Medicine, Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, California, United States of America
- Stanford University, Stanford, California, United States of America
| | - Geoffrey C. Gurtner
- Hagey Laboratory for Regenerative Medicine, Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, California, United States of America
- Institute of Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Sheng Ding
- Stanford University School of Medicine, Stanford, California, United States of America
| | - Michael T. Longaker
- Hagey Laboratory for Regenerative Medicine, Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, California, United States of America
- Institute of Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, California, United States of America
- * E-mail:
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