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Biomarkers of oxidative stress in the fungal strain Humicola lutea under copper exposure

Paper ID Volume ID Publish Year Pages File Format Full-Text
35276 45084 2009 8 PDF Available
Title
Biomarkers of oxidative stress in the fungal strain Humicola lutea under copper exposure
Abstract

The fungal strain Humicola lutea 103 was used as a model organism to examine the relationship between copper toxicity and oxidative stress in low eukaryotes such as filamentous fungi. Spores or submerged cultures were treated with different copper concentrations and the oxidative stress-inducing agent paraquat (PQ). Oxidative stress biomarkers such as reactive oxygen species (ROS), cyanide-resistant respiration, protein carbonyls, reserve carbohydrates, and antioxidant defence were identified in cells treated or not treated with either copper ions or PQ. Copper inhibited the growth and conidiospore formation of H. lutea 103 in a concentration-dependent manner. This treatment also resulted in increased superoxide anion radical formation. Copper stress was furthermore accompanied by transient accumulation of trehalose and glycogen, as well as increased protein carbonyl content. Compared to control cultures, copper-treated mycelia demonstrated a marked increase in the activity of protective enzymes (superoxide dismutase, catalase, and glucose-6-phosphate dehydrogenase). These increased antioxidant enzyme activities were blocked by inhibitors of protein synthesis, suggesting that de novo enzyme formation was involved. Biomarker response to the heavy metal was similar to treatment with known ROS generators such as PQ. The observed hyper-oxidative status and increased oxidative damage suggest a relationship between acute metal treatment and oxidative stress in fungal cells.

Keywords
Filamentous fungi; Oxidative stress biomarkers; Copper toxicity; ROS generation; Carbonyl groups; Antioxidant enzymes
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Biomarkers of oxidative stress in the fungal strain Humicola lutea under copper exposure
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 44, Issue 3, March 2009, Pages 288–295
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us